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Laars JVS Installation And Operation Instructions Manual

Manual is about: Mini-Therm II

Summary of JVS

  • Page 1

    Mini-therm laars h0071400y for your safety: this product must be installed and serviced by a professional service technician, qualified in hot water boiler installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in flue gases which could cause serious in...

  • Page 2

    Laars heating systems page 2 table of contents section 1. General information 1.1 introduction ................................................... 3 1.2 warranty ....................................................... 3 1.3 codes and standards ................................... 3 1.4 technical assi...

  • Page 3

    Mini-therm ii hydronic boiler page 3 section 1. General information 1.1 introduction this manual provides information necessary for the installation, operation, and maintenance of laars model jv copper tube hydronic boilers. All application and installation procedures should be reviewed completely b...

  • Page 4

    Laars heating systems page 4 1. Plumbing materials for the bypass piping, which is required for: a. Any system where the return water temperature may be less than 120°f, such as in-floor radiant systems, snow melt systems or other systems where a “cold start” is expected frequently due to thermostat...

  • Page 5

    Mini-therm ii hydronic boiler page 5 2.2 field assembly 1. Mini-therm ii boilers have built-in draft diverter for natural draft operation. 2. Find the vent damper box which is located in the boiler package. 3. Install the vent damper directly to the top of the draft diverter outlet with the damper o...

  • Page 6

    Laars heating systems page 6 caution do not force motor operation when operator is fastened to the damper by moving the damper blade, turning the shaft or by turning the position indicator. Attention ne pas tourner le registre manuellement avec ou sans courant électrique ou le moteur sera endommagé....

  • Page 7

    Mini-therm ii hydronic boiler page 7 section 3. Venting 3.1 combustion air supply the boiler location must provide sufficient air supply for proper combustion, and ventilation of the surrounding area as outlined in the latest edition of ansi standard z223.1 or in canada, csa-b149.1, and any local co...

  • Page 8

    Laars heating systems page 8 warning vent pipe diameter must be as required by the national fuel gas code z223.1 or the canadian installation codes for gas appliances csa-b149.1. Undersize pipe can result in inadequate venting and oversize pipe can result in vent condensation. In either case the res...

  • Page 9

    Mini-therm ii hydronic boiler page 9 warning operation of appliances with a blocked common vent may lead to serious injury or death. Safety devices must be implemented to prevent blocked common vent operation. If safe operation of all appliances connected to a common vent cannot be assured, includin...

  • Page 10

    Laars heating systems page 10 section 4. Gas connections 4.1 gas supply and piping review the following general instructions before continuing the installation. Warning the mini-therm ii jvs and jvt boilers are designed for use with either natural gas or lp gas. Check the rating plate to be sure tha...

  • Page 11

    Mini-therm ii hydronic boiler page 11 note: the boiler and all other gas appliances sharing the boiler gas supply line must be firing at maximum capacity to properly measure the inlet supply pressure. Low gas pressure could be an indication of an undersize gas meter and/or obstructed gas supply line...

  • Page 12

    Laars heating systems page 12 a full sized, 1¼" bypass with balancing valves is strongly recommended for all systems, and required when: 1) the boiler is installed without primary- secondary piping in a multiple zone system; 2) when the return water temperature can be expected to be lower than 120°f...

  • Page 13

    Mini-therm ii hydronic boiler page 13 figure 6. Typical plumbing installations. Jv from system to system non-low temperature systems (120°f+ return temps) simple primary/secondary piping - hydronic - not low temp note: all closed loop systems should include air elimination, expansion tank and feed w...

  • Page 14

    Laars heating systems page 14 figure 6a. Typical plumbing installations. Key: pump check valve valve zone valve union auto air bleeder air scoop jv boiler bypass valve (ball valve) zone pump purge system optional pump location feed water inlet air cushion type expansion tank optional feed water inle...

  • Page 15

    Mini-therm ii hydronic boiler page 15 5.3 flow requirements all high recovery, low volume water boilers must have adequate flow for efficient operation. Pump selection is critical to this goal, and pumps should be selected to provide for system design water temperature rise. Table 6 details temperat...

  • Page 16

    Laars heating systems page 16 5.4 chilled water systems if the boiler is installed in conjunction with refrigeration systems, it shall be installed so that the chilled medium is piped in parallel with the heating boiler with appropriate valves to prevent the chilled medium from entering the heating ...

  • Page 17

    Mini-therm ii hydronic boiler page 17 1 2 3 4 5 6 bk-black w-white r-red y-yellow bl-blue br-brown o-orange p-purple spark ignition wire 115v-factory wired 115v-field wired 24v-factory wired 24v-field wired if any of the original wire (as supplied with the appliance) must be replaced it must be repl...

  • Page 18

    Laars heating systems page 18 figure 9c. Wiring diagram, standing pilot system (jvt). Figure 9d. Schematic, standing pilot system (jvt)..

  • Page 19

    Mini-therm ii hydronic boiler page 19 sp ark mv mv/pv pv gnd 24v (gr) 24v th-w mv spark 1 2 3 4 5 6 7 8 9 w w b b r r lo hi mv c pv hi pilot burner with spark electrode sensor remote flame sensor high altitude (optional) two-stage aquastat two-stage gas valve hw vr8304 switch safety roll-out blocked...

  • Page 20

    Laars heating systems page 20 figure 10. Multiple zone wiring. For primary/secondary pumping: connect to "w" in lieu of "a." boiler relay is used for boiler pump and connection to "w" will energize boiler pump when any zone is calling for heat. Wiring with taco zone valves wiring with honeywell zone...

  • Page 21

    Mini-therm ii hydronic boiler page 21 6.3 grounding warning the boiler 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, in the u.S. An...

  • Page 22

    Laars heating systems page 22 on continuous pilot ignition models (jvt), if the water temperature is below the limit setting, the ignition module opens the main gas valve, and the main burners ignite. Operation will continue on all ignition systems until either the wall setting thermostat is satisfi...

  • Page 23

    Mini-therm ii hydronic boiler page 23 caution should overheating occur or the gas supply fail to shut off, do not turn off or disconnect the electrical supply to the pump. Instead, shut off the gas supply at a location external to the appliance. Attention en cas de surchauffe ou si l’admission de ga...

  • Page 24

    Laars heating systems page 24 15. Replace control box cover. 16. Restore power to the boiler and adjust the thermostat high enough to call for heat to verify the boiler is operating properly. 17. Jvs 100-225 only - adjust two-stage operating control setting to maximum, verify high fire operation. Re...

  • Page 25

    Mini-therm ii hydronic boiler page 25 danger read and understand this entire procedure prior to proceeding. Improper adjustment of high altitude shutters may result in a fire, explosion, and/or high levels of toxic gases which may cause property damage, personal injury, or loss of life. Danger lisez...

  • Page 26

    Laars heating systems page 26 1. Lubricate the water circulating pump per the instructions on the pump. 2. If a strainer is employed in a pressure reducing valve or the piping, clean it every six months. 3. At start-up, and periodically thereafter, the burner flame should be observed. If the flame h...

  • Page 27

    Mini-therm ii hydronic boiler page 27 caution two-stage operating control (jv100-225 only): factory setting is 140°f (60°c). This setting is correct for most hydronic heating applications. Adjustments to this setting must be made by an authorized service technician. 2. Two-stage temperature control ...

  • Page 28

    Laars heating systems page 28 table 8. Troubleshooting guide. # symptom cause remedy 1. Pump not a. No power a. Check circuit breakers and power source. Operating b. Pump defective b. Replace. C. Incorrectly wired c. Recheck wiring diagrams. 2. Pilot outage a. Inlet gas pressure too low a. Consult g...

  • Page 29

    Mini-therm ii hydronic boiler page 29 9.3 troubleshooting honeywell s8600 intermittent pilot system some boilers may be equipped with an ignition module that shuts off pilot gas if pilot fails to light. To reset, interrupt power to heater note: before troubleshooting, familiarize yourself with the s...

  • Page 30

    Laars heating systems page 30 9.4 electrical troubleshooting 1. Remove the control box cover on the front of the boiler. 2. Verify that 115v is reaching the boiler by testing across the black wire on the pump relay and the white wire on the transformer. 3. Verify 24v transformer output by placing th...

  • Page 31

    Mini-therm ii hydronic boiler page 31 heat distribution units transfers heat from the water supplied by the boiler to the area to be heated through the use of baseboard, convector, radiator, finned tube. Also known as "radiation." isolation valve used to isolate the boiler from the circuit. It minim...

  • Page 32

    Laars heating systems page 32 description model, size jvs-50 jvt-50 jvs-75 jvt-75 jvs-100 jvt-100 jvs-125 jvt-125 jvs-160 jvt-160 jvs-225 jvt-225 pilot gas system pilot assy (nat.) w0030600 w0040900 w0030600 w0040900 w0030600 w0040900 w0030600 w0040900 w0030600 w0040900 w0030600 w0040900 pilot assy ...

  • Page 33

    Mini-therm ii hydronic boiler page 33 description model, size jvs-50 jvt-50 jvs-75 jvt-75 jvs-100 jvt-100 jvs-125 jvt-125 jvs-160 jvt-160 jvs-225 jvt-225 water system heat exchanger 11046001 11046001 11046002 11046002 11046003 11046003 11046004 11046004 11046005 11046005 11046006 11046006 temperatur...

  • Page 34

    Laars heating systems page 34 figure 15. Parts identification. 11.3exploded view vent damper draft diverter top rear panel burner with pilot bracket pilot assembly gas manifold base assembly refractory, rear refractory, front gap closure hx access panel heat exchanger flue collector 1-1/4” hold 1-1/...

  • Page 35

    Mini-therm ii hydronic boiler page 35.

  • Page 36

    H0071400y a subsidiary of bradford white corporation 800.900.9276 • fax 800.559.1583 (customer service, service advisors) 20 industrial way, rochester, nh 03867 • 603.335.6300 • fax 603.335.3355 1869 sismet road, mississauga, ontario, canada l4w 1w8 • 905.238.0100 • fax 905.366.0130 www.Laars.Com li...