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- Installation And Operation Instructions Manual
Laars NTH1000 Installation And Operation Instructions Manual - page 122
LAARS Heating Systems
Page 118
fig. 135 – Pump test
12.5 lead/lag Slave Diagnostics
The control system includes a diagnostic screen that
lists some information on the Lead/Lag slaves in the
system. See Fig. 136.
How to get there –
Home Page
Screen
12.6 Statistics
The controller can present some summary information
about the operation of the system – number of pump
cycles, number of burner cycles, etc.
How to get there –
Home Page
Configurationline>StatisticsConfigurationScreen Fig.137–StatisticsConfigurationScreen fig. 136 - lead/lag Slave Status Use the left- and right-arrows to see all of the columns in the display.
Summary of NTH1000
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Installation and operation instructions document 1247 h2344800 - warning if the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. Do not store or use gasoline or other flammable vapors and liquids in the vicin...
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Laars heating systems section 1 - general information ........................................ 1 1.1 introduction ...................................................... 1 1.2 about the neotherm control system .............. 1 1.3 safety notes ..................................................... 3 1...
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Laars heating systems section9–setupandconfiguration ...............................44 9.1 review of lead/lag control system ............. 44 9.1.1 about lead/lag operation ............................. 44 9.1.2 lead/lag modulation cycle ........................... 45 9.1.3 lead/lag domestic hot wat...
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Neotherm boilers and water heaters page 1 section 1 general information warning neotherm units must be installed in accordance with the procedures detailed in this manual, or the laars heating systems warranty will be voided. The installation must conform to the requirements of the local jurisdictio...
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Laars heating systems page 2 operator interface boiler 1 slave 4 boiler 2 slave 3 slave 2 lead lag master and slave 1 slave 6 boiler 3 slave 5 slave 8 boiler 4 slave 7 addr 1 addr 2 addr 3 addr 4 addr 5 addr 6 addr 7 addr 8 fig. 2 – lead/lag arrangement in a multiple- boiler installation in a multip...
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Neotherm boilers and water heaters page 3 1.3 safety notes warning fire or explosion hazard improperconfigurationcancausefuelbuildupand explosion. Improper user operation may result in property loss, severe physical injury, or death. Anychangestosafety-relatedconfiguration parameters must only be do...
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Laars heating systems page 4 fig. 4 - location of components 1.6 warranty laars heating systems’ neotherm appliances are covered by a limited warranty. The owner should complete the warranty registration at: http://www.Laars.Com all warranty claims must be made to an authorized laars heating systems...
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Neotherm boilers and water heaters page 5 fig. 5 - dimensions 1.7 dimensions the dimensions are shown in fig. 5. 1.8 unpacking the neotherm unit is shipped in a single crate. The standard outdoor/system sensor kit is packed inside the same crate. 1. Remove all packing and tie-down materials. 2. Chec...
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Laars heating systems page 6 section 2 locating the unit 2.1 locating the unit the neotherm unit may be installed indoors or outdoors. The unit may only be installed outdoors in a location which will never experience freezing temperatures. Choose a location for the unit which allows clearances on al...
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Neotherm boilers and water heaters page 7 shall be of the same cross-sectional area as the free area of the openings to which they connect. Method 1 : two permanent openings, one commencing within 12” (300 mm) of the top and one commencing within 12” (300 mm) of the bottom, of the enclosure shall be...
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Laars heating systems page 8 method 2 : one permanent opening, commencing within 12” (300 mm) of the top of the enclosure, shall be permitted. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces that directly c...
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Neotherm boilers and water heaters page 9 3.2 venting warning selection of improper vent materials for installations that are installed in closets, or will be operated in high ambient temperature levels, may lead to property damage, personal injury, or death. Warning a 12” section of cpvc must be co...
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Laars heating systems page 10 the condensate drain must be installed so as to prevent the accumulation of condensate. When a condensate pump is not used, the tubing must continuously slope downward toward the drain with no spiraling. Consult local codes for the disposal method. Caution condensate is...
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Neotherm boilers and water heaters page 11 *when vent terminal is less than 10 feet (3 m) horizontally from a forced air inlet, the terminal must be at least 3 feet (0.9 m) above the air inlet. Fig. 8 - combustion air and vent through side wall u.S. Installations (see note 1) canadian installations ...
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Laars heating systems page 12 2. Vent terminals for condensing appliances or appliances with condensing vents are not permitted to terminate above a public walkway, or over an area where condensate or vapor could create a nuisance or hazard. 3. Locate the vent terminal so that vent gases cannot be d...
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Neotherm boilers and water heaters page 13 3. Locate the combustion air terminal so that it cannot be blocked by snow. The national fuel gascoderequiresthatitbeatleast12inches (30 cm) above grade, but the installer may determine it should be higher, depending upon local conditions. 4. If the neother...
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Laars heating systems page 14 when an existing boiler is removed from a common venting system, the common venting system is likely to be too large for proper venting of the appliances remaining connected to it. At the time of removal of an existing boiler, the following steps shall be followed with ...
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Neotherm boilers and water heaters page 15 section 4 gas supply and piping 4.1 gas supply and piping gaspipingshouldbesupportedbysuitablehangers orfloorstands,nottheappliance. Installers should refer to local building and safety codes or, in the absence of such requirements, follow thenationalfuelga...
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Laars heating systems page 16 sched 40 metal pipe capacity for 1.50 specific gravity undiluted propane nominal pipe size @ 11” w.C. Inlet and 0.5” w.C. Pressure drop size 1/2” 3/4” 1” 1-1/4” 1-1/2” 2” length maximum capacity in thousands of btu per hour 20 200 418 787 1616 2422 4664 40 137 287 541 1...
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Neotherm boilers and water heaters page 17 section 5 pump requirements 5.1 neotherm boiler flow and head requirements 5.2 neotherm water heater flow and head requirements table 7 - water flow requirements table 8 - neotherm water heater flow data temperature rise in °f 20°f 25°f 30°f 35°f 40°f 45°f ...
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Laars heating systems page 18 the neotherm unit’s efficiency is higher with lower return water temperatures. Therefore, to get the best low return temperature with multiple boilers, pipe as shown in figures 14 and 15. 6a.2 nth cold water make-up 1. Connect the cold water supply to the inlet connecti...
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Neotherm boilers and water heaters page 19 do not use automotive antifreeze. To help prevent freezing, laars recommends the use of inhibited glycol concentrations between 20% and 35% glycol. Typically, this concentration will serve as burst protection for temperatures down to approximately -5°f(-20°...
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Laars heating systems page 20 fig. 11 - hydronic piping — single boiler, multiple temperature zones zoning with circulators water feed controls air vent 4 pipe dia. Max. 4 pipe dia. Max. 4 pipe dia. Max. 4 pipe dia. Max. Low temp. Radiant zone space heating zone circuits space heating zone circuit s...
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Neotherm boilers and water heaters page 21 fig. 12 - hydronic piping — single boiler, zoning with circulators, indirect dhw tank with zone pumps indirect tank directly off of boiler air vent 4 pipe dia. Max. Expansion tank water feed controls 4 pipe dia. Max. Indirect dwh tank anti-scald mixing valv...
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Laars heating systems page 22 fig. 13 - hydronic piping — single boiler with low temperature zones and indirect dhw tank indirect tank directly off of boiler low temp. Radiant zone low temp. Radiant zone air vent water feed controls expansion tank 4 pipe dia. Max. Indirect dwh tank anti-scald mixing...
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Neotherm boilers and water heaters page 23 fig. 14 - hydronic piping — multiple boilers, multiple temperature zones, reverse return zoning with circulators space heating zone circuits low temp. Radiant zone space heating zone circuit air vent water feed controls expansion tank common piping must be ...
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Laars heating systems page 24 fig. 15 - hydronic piping — multiple boilers, indirect dhw off of one boiler space heating zone circuits space heating zone circuit air vent water feed controls expansion tank common piping must be sized for the combined water flow of all the boilers. High temp. Space h...
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Neotherm boilers and water heaters page 25 6b.2 ntv piping requirements the water piping should be supported by suitable hangersandfloorstands.Donotsupportthepiping with this appliance. The hangers used should allow for expansion and contraction of copper pipe. Rigid hangers may transmit noise throu...
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Laars heating systems page 26 6b.3 ntv cold water make-up the cold water make-up may be connected to the tank or to the inlet of the boiler as shown in figures 16-18.Installbackflowpreventersandshutoffs where needed or required by code. 6b.4 ntv freeze protection the ntv unit must never be installed...
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Neotherm boilers and water heaters page 27 fig. 18 - dhw piping - two heaters, two vertical tanks notes: 1. Optional cwmu & recirculation line location. 2. Locate the ntv dhw sensor or remote aquastat well in lower 1/3 of tank. 3. Back flow preventer may be required - check local codes. 4. Thermal e...
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Laars heating systems page 28 section 7 electrical connections warning the appliance must be electrically grounded in accordance with the requirements of the authority having jurisdiction or, in the absence of such requirements, with the latest edition of the national electrical code, ansi/nfpa 70, ...
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Neotherm boilers and water heaters page 29 fig. 19 - electronics panel layout tb5 tb2 tb1 primary controller (upper burner) secondary controller (lower burner) tb7 tb6 tb4 tb3.
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Laars heating systems page 30 7.3 24 vac transformer with integral circuit breaker 24 vac is supplied by a transformer mounted on the control panel. All 24 vac power is supplied through a circuit breaker that is part of the transformer. The transformer is then connected to terminal blocks 1 and 2 (t...
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Neotherm boilers and water heaters page 31 fig. 20 - ladder diagram.
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Laars heating systems page 32 fig. 21 - wiring diagram.
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Neotherm boilers and water heaters page 33.
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Laars heating systems page 34 section 8 using the controls on the neotherm 1000 8.1 controls and indicators on the front of the unit there are only a few controls and indicators on the front of the unit. See fig. 22. Most of the control functions are done using the operator interface panel. 8.2 usin...
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Neotherm boilers and water heaters page 35 when a password is necessary, the system will present the keyboard screen. See fig. 25. Fig. 25 - keyboard screen the passwords used by this system are “case sensitive” – it matters whether a letter in the password is capitalized or not. Pressing the shift ...
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Laars heating systems page 36 fig. 26 - numeric entry screen anyone can view all of the parameters. However, to change most of the parameters, you will need a password. In the center of the screen shown in fig. 27, the system is telling you that it wants you to log in. Fig. 27 - login required thesc...
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Neotherm boilers and water heaters page 37 2. Press the view lead lag button to go to a screen that shows the status of the whole lead/ lagsystem.Seefig.29. Fig. 29 - lead/lag screen in the example shown here, the complete system includes two burners. Both burners are firingat35%fanspeed.Thevalueof1...
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Laars heating systems page 38 fig. 32 - status summary screen showing pumps information notice the four buttons at the bottom of each status summary screen: • configure–allowsaninstallertochange some of the setup parameters used by the system. A password may be required. • operation–usedtoadjustthes...
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Neotherm boilers and water heaters page 39 fig. 35 - typical details screen – frost protection thelistpresentedhereistoolongtofitontoasingle screen, so you must scroll down to see the rest. The bar graph on the left side of the screen shows the current performance in relation to a setpoint or the to...
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Laars heating systems page 40 fig. 37 - status summary page 3. Presstheconfigurebuttontostarta configurationsessionfortheselected controller.Seefig.38. Fig.38-configurationscreen thisscreenlistsalloftheconfiguration groups. (the list is actually longer – scroll down using the bar on the right side o...
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Neotherm boilers and water heaters page 41 8.8 verificationprocessforsafety- related parameters 1. When you start to change a parameter that is related to safety, the system will present a warning which looks like this: fig. 41 - parameter safety warning pressoktocontinue.Thesystemwillask you to log...
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Laars heating systems page 42 fig. 43 - reset button on controller 3. Don’t press the reset button yet. We just want to show you where the reset button is located. Change the parameter(s) you want to change. 4. When you are done entering parameters, the nextjobistodotheverification.Logintothe system...
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Neotherm boilers and water heaters page 43 8.9 cleaning the touchscreen the operator interface includes a cleaning routine for the touchscreen. If the screen was active while you cleaned it, you might enter a series of random commands or parameters. During the cleaning routine, the screen is disable...
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Laars heating systems page 44 section 9 setup and configuration 9.1 review of lead/lag control system 9.1.1 about lead/lag operation the boilers in this series are always set up for lead/ lag operation. In a single-boiler installation, there are two controllers and two burners, as shown in fig. 49.T...
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Neotherm boilers and water heaters page 45 in either kind of installation, a system sensor is usually used to monitor the demand. The input from this sensor is used to control the modulation rates of the operating burners. Boiler burner position control master/slave as- signment modbus control ad- d...
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Laars heating systems page 46 fig. 51 – lead/lag activity in a multi-boiler system low demand - the first burner* in sequence fires at less than 65% first burner* second burner* third burner* fourth burner* boiler x boiler y demand increases - once the first burner reaches 50%, the second burner* sw...
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Neotherm boilers and water heaters page 47 fig. 52 – connection terminals.
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Laars heating systems page 48 2. Followingthetable,lookupthespecific installation jobs for your system in section 9.4.Thejobsareidentifiedusingletters(job athroughjobp). If you are not familiar with the neotherm units or the lead/lag control system, you may want to review the information in section ...
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Neotherm boilers and water heaters page 49 system multiple or single boilers system or local boiler control common vent setpoint control 4-20 ma modulation control, 4-20 ma outdoor reset 15 single boiler system no no yes no 16 single boiler system no no yes yes, from system 17 multiple boiler system...
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Laars heating systems page 50 system 4 – multiple boilers, local control, outdoor reset jobb setupthenamesforeachofthecontrollers jobc makeonecontrolthelead/lagmaster jobd oneachofthecontrollersthatwillactasaslave,disablethelead/lagmaster jobe setupthemodbuscontroladdressingtoassignaddressesforeacho...
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Neotherm boilers and water heaters page 51 system 7 – single boiler, system control jobi settheparametersusedbythelead/lagsystem jobl buildingautomationormultipleboilercontrolthermostatdemand jobo setupthecombustiononeachoftheburners jobp setthedateandtimeonthesystem system8– single boiler, system c...
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Laars heating systems page 52 system 11 – single boiler, system control, 4-20 ma setpoint control jobi settheparametersusedbythelead/lagsystem jobm buildingautomationormultipleboilercontrol4-20masetpointcontrol jobo setupthecombustiononeachoftheburners jobp setthedateandtimeonthesystem system 12 – s...
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Neotherm boilers and water heaters page 53 system 15 – single boiler, system control, 4-20 ma modulation control jobi settheparametersusedbythelead/lagsystem jobn buildingautomationormultipleboilercontrol4-20mamodulationcontrol jobo setupthecombustiononeachoftheburners jobp setthedateandtimeonthesys...
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Laars heating systems page 54 system19– multiple boiler, system control, common vent, 4-20 ma setpoint control joba noteoncommonventing jobb setupthenamesforeachofthecontrollers jobc makeonecontrolthelead/lagmaster jobd oneachofthecontrollersthatwillactasaslave,disablethelead/lagmaster jobe setupthe...
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Neotherm boilers and water heaters page 55 system 22 – multiple boiler, system control, common vent, 4-20 ma modulation control, outdoor reset joba noteoncommonventing jobb setupthenamesforeachofthecontrollers jobc makeonecontrolthelead/lagmaster jobd oneachofthecontrollersthatwillactasaslave,disabl...
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Laars heating systems page 56 9.4 installation jobs note – to install your system, you will not need to do all of the installation jobs listed here. Please refer to section 9.3 for a list of specific installation jobs necessary to install your system. Job a – note for systems using common venting if...
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Neotherm boilers and water heaters page 57 fig.56-systemidentificationandaccess 5. Godowntothelineforboilernametochange the name of the control. In this example, we are working with the primary control on boiler 1, so the name here should be “boiler 1 primary.” to change the entry, press on the line...
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Laars heating systems page 58 2. In a running system, the following screen would normally show the current activity of eachunitinthelead/lagsystem.Seefig.58. Fig. 58 – lead/lag screen 3. To set up the lead/lag master function, press thebuttonforleadlagmaster.Fig.59shows the screen that follows. Fig....
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Neotherm boilers and water heaters page 59 1. From the home screen (fig. 61), press the icon for the controller you want to work with. In this example, we will start with the secondary controller for boiler 1, and make sure this is not set up as a master. Fig. 61 – home screen 2. The system will tak...
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Laars heating systems page 60 5. At this point, you have disabled the master functionononeofthecontrollers.Youwill need to repeat the process for each of the other controllers in the system (except the primary controller on boiler 1). Gototheoperatorinterfaceonthenextboiler. Repeatsteps1through4fort...
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Neotherm boilers and water heaters page 61 8. Pressthechangeaddressbuttonagain.The system will present a screen that lets you change the address. Fig. 68 – changing modbus address 9. Table13showshowthemodbuscontrol addressing should be set up. The system is simple, but it is important to only use th...
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Laars heating systems page 62 aflapvalveactslikeaone-wayvalveorcheckvalve. If one burner in a boiler is operating, and the other isnot,oneoftheflapvalveswillclosetoprevent exhaust air from moving backwards through the burner that is not operating. Before the lead/lag master controller will allow the...
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Neotherm boilers and water heaters page 63 fig.73–flapvalveconfigurationscreen notice that there are two items on this screen. Controller id - thisistheidnumberoftheflapvalve associated with this controller. (we will set the id number for the other controller in this boiler in a moment.) number of c...
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Laars heating systems page 64 in this example, we are still working with the primary control for boiler 1. From the table, youcanseethatthiscontrolshouldhaveaflap valveidof“1.”enterthecorrectidfrom table5inthisfield.Thesystemwillaskyou to login before you do this. Warning if the controller cannot fi...
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Neotherm boilers and water heaters page 65 fig.78–safetyparameterconfirmation checkthelistcarefully.Pressyesifallof the parameters in the group have been entered correctly. 11. The system will tell you to reset the control system. Fig. 79 – safety parameter reset youmustpresstheresetbuttonwithin30 s...
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Laars heating systems page 66 fig. 81 – modbus connections boiler 1 ctrl 1 ctrl 2 a b c mb 2 mb 1 mb 2 mb 1 a b c boiler 2 ctrl 1 ctrl 2 a b c mb 2 mb 1 mb 2 mb 1 a b c boiler 3 ctrl 1 ctrl 2 a b c mb 2 mb 1 mb 2 mb 1 a b c boiler 4 ctrl 1 ctrl 2 a b c mb 2 mb 1 mb 2 mb 1 a b c a b c a b c a b c a b...
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Neotherm boilers and water heaters page 67 1. Fromthehomescreen(fig.82),pressthe view lead lag button. Fig. 82 – home screen 2. If the system were running, the following screen would normally show the current activity of each unit in the lead/lag system. Seefig.83. Fig. 83 – lead/lag screen 3. To se...
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Laars heating systems page 68 here are the settings on this screen: master enable - enabled=lead/lagsystemenabled ch setpoint - setpoint for ll central heating ch time of day setpoint - separate time-of-day setpoint for central heating (see the material on “about the ‘time of day’ function at the en...
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Neotherm boilers and water heaters page 69 8. Presstheleft-arroworright-arrowuntilyousee thecentralheatscreen(fig.87). Fig. 87 – central heat setpoint source - this sets the source of the system sensor input used to control the system. The options here are local and 4-20 ma. (for instructions on set...
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Laars heating systems page 70 10. Press the left-arrow or right-arrow until you see theoutdoorresetscreen(fig.89). Fig. 89 – outdoor reset “outdoor reset” allows the system to adjust the central heat setpoint to compensate for changes in the outdoor temperature. This allows the whole system to run m...
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Neotherm boilers and water heaters page 71 when enabled, the warm weather shutdown feature will turn off the central heating functions when the outdoor temperature exceeds the setpoint. This prevents the system from running when there is no need for heat. Enable- these options determine how quickly ...
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Laars heating systems page 72 the input for the time of day function must be wired topins2and3onconnectorj10. Fig. 93 – connections for “time of day” function job j - install system sensor and adjust setpoint (this is a lead/lag function – do this once for the whole lead/ lag system. Make the connec...
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Neotherm boilers and water heaters page 73 fig. 96 – warm weather shutdown when enabled, the warm weather shutdown feature will turn off the central heating functions when the outdoor temperature exceeds the setpoint. This prevents the system from running when there is no need for heat. Enable - the...
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Laars heating systems page 74 when you set up the outdoor reset feature, you can set the “turning points” on the adjusted setpoint curve.Ifyougobacktofig.9-47,theoutdoorreset screen, you see that the system records these values: enable- enable=outdoorresetfeatureturnedon max. Outdoor temp. - if the ...
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Neotherm boilers and water heaters page 75 fig.98–leadlagcentralheatconfiguration 3. Change the 4 ma water temperature to match the lowest water temperature setting on the building automation system or multiple boiler control. 4. Change the 20ma water temperature to match the highest water temperatu...
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Laars heating systems page 76 • whenyouarethrough,youshutoffthe controller/burner you have been working with, turn on the other controller/burner, and make the same adjustments there. Warning improper adjustment may lead to poor combustion quality, increasing the amount of carbon monoxide produced. ...
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Neotherm boilers and water heaters page 77 fig. 102 – home screen 4. The system will present the status summary screen. Press the operation button. Fig. 103 – status summary screen 5. The system will present the operation screen for the secondary burner. Fig. 104 – operation screen press the burner ...
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Laars heating systems page 78 control to manual, this forces the burner to run at full combustion so you can adjust the gas valve for the correct co 2 output. Figure 100 shows the adjusting points on the gas valve. Adjust the high fire screw to get the proper co 2 levelforhighfire.Seetable 17.Torais...
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Neotherm boilers and water heaters page 79 • turnoffthecallforheat,andsetboth burnerstorunat1200rpmforlowfire.Turn on the call for heat, and check the performance again. 19. Iftheco 2 doesn’t track between the correct limits, there is a possibility that one of the burners has not been set up correct...
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Laars heating systems page 80 2. Press the setup button. The system will present the display setup screen. Fig. 108 – display setup screen 3. Press the advanced setup button. The advancedsetupscreenisshowninfig.109. Fig. 109 – advanced setup screen 4. Select date and time. Figure 110 shows the setup...
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Neotherm boilers and water heaters page 81 9.5 setup for domestic hot water on a lead/lag system there are three ways that a neotherm 1000 system can be set up to provide domestic hot water. Two of them involve the use of an indirect water heater. In a system including an indirect water heater, hot ...
Page 86
Laars heating systems page 82 fig. 113 – lead/lag master screen 4. Presstheconfigurebutton.Thedisplaywill presentthelead/lagmasterconfiguration screen (fig. 114). Fig.114–lead/lagmasterconfiguration entriesonthisscreenallowyoutosetthech setpoint and dhw setpoint. 5. Press the button for advanced set...
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Neotherm boilers and water heaters page 83 • oneachoftheboilersusedfordhw,thetwo burners in that boiler will operate in lead/lag mode.Youcanthinkofeachoftheseboilers as a separate two-burner lead/lag system. Once a system is set up this way, if there is no dhw demand, the system will operate like an...
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Laars heating systems page 84 2. If the system was running, the following screen would normally show the current activity of each unit in the multiple boiler arrangement.Seefig.118. Fig. 118 – lead/lag screen 3. Press the button for lead lag master. Fig. 119showsthescreenthatfollows. Fig. 119 – lead...
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Neotherm boilers and water heaters page 85 9.6 installer parameters this is a list of all of the parameters which can be accessed using the installer password. Label description how to reach 4 ma water temperature if a 4 – 20 ma input is used to adjust the setpoint, this entry sets the low limit of ...
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Laars heating systems page 86 label description how to reach ch (central heat) has priority over ll (lead/ lag) this controls whether a local central heat demand has priority over the control asserted by the ll master, when this controller is enabled as a slave. If lead/lag enabled – home screen/ vi...
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Neotherm boilers and water heaters page 87 label description how to reach ch (central heat) pump cycle count ch pump cycle count. Can be written to a new value (e.G. If the pump or controller is replaced). Home screen/ select controller/ status summaryscreen/configurebutton/ configurationlist/select...
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Laars heating systems page 88 label description how to reach dhw (domestic hot water) pump control the dhw pump (pump c) can be turned on manually, or it can be set to operate automatically. If it is turned on then it remains on until changed back to auto. In auto mode it operates according to the d...
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Neotherm boilers and water heaters page 89 label description how to reach lead lag d gain this is part of the damping function (“derivative”) used when the controller interprets the input from the system sensor. Home screen/ view lead/lag button/ lead/lag screen/ lead/lag master button/ lead/lag mas...
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Laars heating systems page 90 label description how to reach lead lag off hysteresis when the lead/lag function is enabled, the control system will not shut off the boilers until the temperature at the system sensor rises to the lead/lag ch setpoint plus a hysteresis value (normallyabout10°f). Home ...
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Neotherm boilers and water heaters page 91 label description how to reach lead/lag outdoor reset max outdoor temperature if lead/lag is enabled, this is the maximum outdoor temperature at which the outdoor reset feature will be active. Home screen/ view lead/lag button/ lead/lag screen/ lead/lag mas...
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Laars heating systems page 92 11. Shut down the entire system and vent all radiation units and high points in the system piping, as described in step 4. 12. Close the make-up water valve. Check the strainer in the pressure reducing valve for sediment or debris from the make-up water line. Reopen the...
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Neotherm boilers and water heaters page 93 caution if any odor of gas is detected, or if the gas burner does not appear to be functioning in a normal manner, close the main gas shutoff valve. Do not shut off the power switch. Contact your heating contractor, gas company, or factory representative. 1...
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Laars heating systems page 94 section 11 maintenance warning disconnect all power to the unit before attempting any service procedures. Contact with electricity can result in severe injury or death. 11.1 system maintenance do the following once a year: 1. Lubricate the system pump, if required, per ...
Page 99
Neotherm boilers and water heaters page 95 power supply to the boiler. Turn off all manual gas valves connecting the boiler to the main gas supply line. Remove the front door of the boiler to gain access to the gas valve and venturi. Disconnect the fourflangeboltsconnectingthegasmanifoldpipe to the ...
Page 100
Laars heating systems page 96 11.2.7 blower the combustion air blower is a high-pressure centrifugal blower with a variable speed motor. The speed of the motor is determined by the control logic. 120 volts are supplied to the blower at all times. If it is necessary to replace the blower, turn off th...
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Neotherm boilers and water heaters page 97 nt size (mbtu) kit number 1000 ca006207 table 18 - gas conversion kit 11.2.10 natural/propane gas conversion neotherm units can easily be converted from natural to propane gas or from propane to natural gas. If a gas conversion is performed, the unit must b...
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Laars heating systems page 98 section 12 troubleshooting 12.1 potential setup and synchronization problems because the neotherm 1000 uses a sophisticated control system, it can constantly perform a series of self-checks. For example, as a burner is lighted, the controller checks each stage of the pu...
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Neotherm boilers and water heaters page 99 12.1.2 flap valve status check eachboilerincludestwoburners,andeachburner hasaflapvalve.Seefig.124. If one burner in a boiler is operating, and the other isnot,theflapvalvefortheburnerthatisoffwill remain closed to prevent air from moving backwards through ...
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Laars heating systems page 100 correct the cause of the problem, and press the button on the screen to clear the hold. 2. If a serious problem continues, the system will declare a lockout. A brief explanation of the cause of the lockout will appear in an orange bar across the bottom of the screen. I...
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Neotherm boilers and water heaters page 101 fig. 128 – lockout history screen the most recent lockouts appear at the top of the list. Any lockout that has not been cleared will appear in red. 5. Youcanseemoredetailedinformationonthe lockout by touching the entry on the screen. Figure129showsthekindo...
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Laars heating systems page 102 12.3 troubleshooting table this table includes a listing of the faults that might be generated by the controllers, and displayed on the operator interface. Some of these can be corrected by an installer changing a parameter, while other conditions are more complicated,...
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Neotherm boilers and water heaters page 103 code description l or h procedure 11 internal fault: invalidburnercontrolstateflag l internal fault 1. Reset module 2. If fault repeats, replace module. 12 internal fault: safety relay drive cap short h internal fault 1. Reset module 2. If fault repeats, r...
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Laars heating systems page 104 code description l or h procedure 26 internal fault: staticflameripple h internal fault 1. Reset module 2. If fault repeats, replace module. 27 internal fault: flame rod shorted to ground detected h internal fault 1. Reset module 2. If fault repeats, replace module. 28...
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Neotherm boilers and water heaters page 105 code description l or h procedure 53 ac input phases reversed l 1. Check the module and display connections. 2. Check the module power supply and make sure that both frequency and voltage meet the specifications. 3.On24vacapplications,assurethatj4terminal ...
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Laars heating systems page 106 code description l or h procedure 79 outlet high limit h or l 1. Check wiring and correct any possible errors. 2. Replace the outlet high limit. 3. If previous steps are correct and fault persists, replace the module. 80 dhw (domestic hot water) high limit h or l 1. Ch...
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Neotherm boilers and water heaters page 107 code description l or h procedure 97 internal fault: a2d mismatch. L internal fault. 1. Reset module. 2. If fault repeats, replace module. 98 internalfault:exceededvsnsr voltage tolerance l internal fault. 1. Reset module. 2. If fault repeats, replace modu...
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Laars heating systems page 108 code description l or h procedure 108 flame lost in run l 1. Check main valve wiring and operation - correct any errors. 2. Check the fuel supply. 3. Check fuel pressure and repeat turndown tests. 4.Checkignitiontransformerelectrode,flame detector,flamedetectorsitingor...
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Neotherm boilers and water heaters page 109 code description l or h procedure 129 fan speed failed during preignition h or l 1. Check wiring and correct any potential wiring errors. 2. Check the vfds (variable-speed fan drive) ability to change speeds. 3. Change the vfd 4. If the fault persists, rep...
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Laars heating systems page 110 code description l or h procedure 153 combustion pressure off h or l 1. Check wiring and correct any errors. 2. Inspect the combustion pressure switch to make sure it is working correctly. 3. Reset and sequence the relay module. 4.Duringstandbyandprepurge,measure thevo...
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Neotherm boilers and water heaters page 111 code description l or h procedure 159 main valve off l 1. Check main valve terminal wiring and correct any errors. 2. Reset and sequence the module. If fault persists, replace the module. 160 ignition on l 1. Check ignition terminal wiring and correct any ...
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Laars heating systems page 112 code description l or h procedure 178 safety relay on at safe start check l internal fault. 1. Reset module. 2. If fault repeats, replace module. 184 invalidblower/hsioutputsetting l 1.Returntoconfigurationmodeandrecheck selected parameters, reverify and reset module. ...
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Neotherm boilers and water heaters page 113 code description l or h procedure 196 invalid ignition source setting l 1.Returntoconfigurationmodeandrecheck selected parameters, reverify and reset module. 2. If fault repeats, verify electrical grounding. 3. If fault repeats, replace module. 197 invalid...
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Laars heating systems page 114 code description l or h procedure 210 invalid postpurge time setting l 1.Returntoconfigurationmodeandrecheck selected parameters, reverify and reset module. 2. If fault repeats, verify electrical grounding. 3. If fault repeats, replace module. 211 invalid power up with...
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Neotherm boilers and water heaters page 115 code description l or h procedure 221 unconfigureddhw(domestichot water) high limit setpoint setting l 1.Returntoconfigurationmodeandrecheck selected parameters, reverify and reset module. 2. If fault repeats, verify electrical grounding. 3. If fault repea...
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Laars heating systems page 116 code description l or h procedure 232 invalid pressure sensor type setting l 1.Returntoconfigurationmodeandrecheck selected parameters, reverify and reset module. 2. If fault repeats, verify electrical grounding. 3. If fault repeats, replace module. 234 invalid outlet ...
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Neotherm boilers and water heaters page 117 12.4 diagnostic tests and input/ output indicators two kinds of screens are grouped together in this section: • detailedindicationsoftheinputandoutput signals • diagnostictestsofthepumpsandburner modulation note that these functions apply to just one selec...
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Laars heating systems page 118 fig. 135 – pump test 12.5 lead/lag slave diagnostics the control system includes a diagnostic screen that lists some information on the lead/lag slaves in the system. See fig. 136. How to get there – home page lead lag screen lead lag screen lead lag slave status scree...
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Neotherm boilers and water heaters page 119 12.7 analysis the control system includes an analysis branch that can display the behavior over a period of time for several different parameters: fan speed, outlet temperature, inlet temperature, etc. How to get there – home page status summary screen any...
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Laars heating systems page 120 burner ignition sequence here is the start-up sequence following a lead lag (ll) central heating request: 1. The thermostat used for the ll central heat function calls for heat. On a system set up for lead/lag operation, this will be the system sensor. (the setpoint or...
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Neotherm boilers and water heaters page 121 during the initiate period: • allofthechecksmadeundersynchronization, plus: • locksoutifa/clinepowererrorsoccur. • locksoutiffour-minuteinitiateperiodhas been exceeded. During the standby period: • allofthechecksmadeundersynchronization, plus: • locksoutif...
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Laars heating systems page 122 13.2 parts list key no. Part no. Description 1 10j3038 bracket, pipe, nt 1000 2 10j1270 bracket, angle, stiffening, control mount 3 10j1246 bracket, anti-racking, front left 4 10j1247 bracket, anti-racking, left side 5 r2073000 rear panel, assy s2113900 gasket, strip, ...
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Neotherm boilers and water heaters page 123 key no. Part no. Description 37 10j1238 bracket, leveling, hex. 38 10j1203 channel, base 39 10j1204 cross brace, hx, base 40 10j1206 rail, hx 41 10j1205 support 42 10j1210 weldment, base 43 10j1268 clamp, attaching, bezel, nt 1.0 44 10j1265 panel assy, doo...
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Laars heating systems page 124 key no. Part no. Description 70 e2340000 sensor, temperature, stack, 1/4” npt 71 10j5056 blower assy, lower 72 10j5055 blower assy, upper 73 10j4050 sub-assembly, water inlet 74 10j4047 clip, quick disconnect 75 10j4040 pipe, water outlet assy 76 f2023700 washer, m5, l...
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Neotherm boilers and water heaters page 125 key no. Part no. Description 119 km004400 high limit kit, nt 1000 120 km004300 lwco kit, nt 1000 121 r2073008 panel assy, control, sliding 10j7008 panel, control, sliding 10j7019 label, high voltage connections, tb1, tb2 & tb5 10j7021 label, low voltage co...
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Laars heating systems page 126 fig. 140 - machine frame and rear panel 13.3 part s i ll us tra ti on s.
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Neotherm boilers and water heaters page 127 fig. 141 - front panel and covers.
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Laars heating systems page 128 fig. 142 - burners and combustion chambers.
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Neotherm boilers and water heaters page 129 fig. 143 - heat exchanger components fig. 144 - burner detail.
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Laars heating systems page 130 fig. 145 - electronic components.
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Neotherm boilers and water heaters page 131 fig. 146 - condensate trap fig. 147 - control bezel.
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Laars heating systems page 132 fig. 148 - flow switch.
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800.900.9276 • fax 800.559.1583 (customer service, service advisors) 20 industrial way, rochester, nh 03867 • 603.335.6300 • fax 603.335.3355 (applications engineering) 1869 sismet road, mississauga, ontario, canada l4w 1w8 • 905.238.0100 • fax 905.366.0130 www.Laars.Com printed in u.S.A. © laars he...