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- Installation And Operation Instructions Manual
Laars U.H.E Installation And Operation Instructions Manual
- Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier,
call the fire department.
- Installation and service must be
performed by a qualified installer, service
agency or gas supplier
WARNING: If the information in
these instructions is not followed
exactly, a fire or explosion may
result causing property damage,
personal injury or death
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE
Installation and Operation Instructions
Document 1103
6
LAARS
®
U.H.E.
TM
Ultra-High Efficiency Commercial Water Heaters
Summary of U.H.E
Page 1
- do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance - what to do if you smell gas • do not try to light any appliance. • do not touch any electrical switch; do not use any phone in your building. • immediately call your gas supplier fro...
Page 2
Section i: important information njury hazards. Indicates an imminently hazardous situation, which, if not avoided, will result in death, serious injury or substantial property damage. Danger indicates potentially hazardous situation, which, if not avoided, may result in moderate or minor injury or ...
Page 3
Danger do not store or use gasoline or other flammable, combustible, or corrosive vapors and/or liquids in the vicinity of this or any other appliance. Do not install any damaged venting system components. If damage is evident then please contact the supplier where the water heater was purchased or ...
Page 4
Warning this water heater needs fresh air for safe operation and must be installed so there are provisions for adequate combustion and ventilation air. Insufficient air supply will cause a recirculation of combustion products resulting in contamination that may be hazardous to life. This will result...
Page 5
Section ii: specifications figure 1. Dimensional layout recovery gph at degree rise dimensions ( inches ) storage volume capacity gallons input rate btu/h 1st hr. Del. Gal. At 100°f rise 40°f 100°f 140°f stg. Cap. U.S. Gal. Therm. Eff. % a ht. B dia. C flr to vent outlet d flr to inlet wtr. Conn e f...
Page 6
Section iii: general information features this water heater contains the following features: main power on/off switch – the front panel of this water heater has a lighted on/off switch, which is illuminated when the main power is turned on to indicate power to the water heater. Combustion system –th...
Page 7
Temperature and pressure relief valve – pu s, o ! Condensate drain - the water heater should either be raised several inches above the floor on a concrete slab or use a low profile condensate pump to allow free drainage of condensate from the elbow drain fitting. This water heater is a condensing ty...
Page 8
Figure 2. Condensate elbow with trap cleanout – all models are equipped with a cleanout opening to aid in removal of hard water deposits from the tank bottom. If this water heater operates under hard water conditions, the following should be performed at least every 3 months: turn off water supply a...
Page 9
Section iv: installation instructions this water heater must be located in an area where leakage of the tank, water line connections, or the combination temperature and pressure relief valve will not result in damage to the area adjacent to the water heater or to lower floors of the structure. When ...
Page 10
Unpacking inspect shipment carefully for any signs of damage. 1. All equipment is carefully manufactured, inspected and packed. 2. Any claims for damage or shortage in shipment must be filed immediately with manufacturer and noted on the bill of lading. 3. Remove all venting components from the comb...
Page 11
Figure 3b. Recommended minimum clearances for service access remove crate 1. Remove all banding and pry off crate sides carefully so as not to damage the water heater. 2. Carefully roll/lift the water heater from the crate base. Caution do not drop water heater. Do not bump water heater jacket again...
Page 12
Danger temperature setting should not exceed safe temperature at fixtures. See water temperature control warning on page 16. If higher preheat temperatures are necessary to obtain adequate booster output, add an anti-scald valve for hot water supplied to fixtures. Location keep appliance area clear ...
Page 13
3. If the water heater is installed as a direct vent (outside air piped directly to the water heater), then additional opening, other than the opening for the air intake, are not required. However, adequate ventilation air must be provided in all cases to prevent increased room temperature. Chemical...
Page 14
Figure 6. Typical two water heater connection figure 7. Typical three water heater connection figure 8. Typical four water heater connection 14.
Page 15
Section v: water connections warning failure to install and maintain a new, listed temperature and pressure relief valve will release the manufacturer from any claim, which might result from excessive temperature and pressures. Hydrogen gas can be produced in an operating water heater that has not h...
Page 16
The following chart details the relationship of water temperature and time with regard to scald injury and may be used as a guide in determining the safest water temperature for your applications. Approximate time/temperature scald chart approximate time/temperature relationships in scalds 120°f mor...
Page 17
Figure 11. Typical plumbing schematic for zoned heating section vi: venting warning the vent system must be properly installed. Failure to properly install the vent system could result in property damage, personal injury, or death. Do not install damaged venting system components. If damage is evide...
Page 18
Caution check to make sure flue gases do not recirculate into the air intake terminal when using direct venting. If the water heater is having service issues, flue recirculation may be a contributing factor. Even when the minimum vent terminal separation distances are followed, recirculation may sti...
Page 19
Figure 12a. Vent terminal clearances (other than direct vent or “power vented” installations) canadian installations 1 us installations 2 canadian installations 1 us installations 2 a= clearance above grade, veranda, porch, deck or balcony 12 inches (30 cm) 12 inches (30 cm) h= clearance to each sid...
Page 20
Figure 12b. Direct vent terminal clearances canadian installations 1 us installations 2 canadian installations 1 us installations 2 a= clearance above grade, veranda, porch, deck or balcony 12 inches (30 cm) 12 inches (30 cm) h= clearance to each side of center line extended above meter/regulator as...
Page 21
The vent system must terminate so that proper clearances are maintained as cited in local codes or the latest edition of the national fuel gas code, ansi z223.1.73.4e and 7.8a, b as follows: 1. Do not terminate near soffit vents or crawl space or other area where condensate or vapor could create a n...
Page 22
2. Use the proper pvc cement to secure the 90° exhaust vent and air intake terminals provided with the water heater to the plastic pipes. The distance between the back edge of the 90° exhaust vent terminal and the exterior wall (see figure 13) must be 6 inches (12.7 cm) more for the exhaust vent ter...
Page 23
Figure 14. Typical vertical direct vent system installation through the wall venting with low ground clearance: when venting cannot exit through the wall at a height greater than or equal to 12” (30.5 cm) (and above expected snow level) from the ground, then the installation must be modified as show...
Page 24
Maximum vent length: direct vent maximum vent length (combined maximum length for intake and exhaust) storage capacity (gallons) rated input (btu/hr) max vent length (feet) 3" pvc, cpvc, or abs max vent length (feet) 4" pvc, cpvc, or abs 60 125,000 120 170 60 150,000 100 150 60 100 100 100 100 100 1...
Page 25
Notice this unit can be vented using only pvc (class 160, astm d-2241 schedule 40, astm d-1785; or cellular core schedule 40 dwv, astm f-891), schedule 40 cpvc (astm f-411), or abs (astm d-2661) pipe. The fittings, other than the terminations should be equivalent to pvc- dwv fittings meeting astm f-...
Page 26
Figure 16. Typical horizontal power vent system vertical installation: vertical venting must be supported every 5 feet of vertical run and every 3 feet of horizontal run of vent pipe length. Stress levels in the pipe and fittings can be significantly increased by improper installation. If rigid pipe...
Page 27
Follow the following procedure to vent through the roof: 1. Cut the necessary holes through the roof and ceiling 2. Install the exhaust vent and air intake plastic pipes as shown in figure 17. Make sure that the installation meets the local codes and/or the national fuel gas code ansi z223.1 (latest...
Page 28
Figure 18. Vent terminal (low ground clearance) maximum vent length determination power vent maximum vent length storage capacity (gallons) rated input (btu/hr) max vent length (feet) 3" pvc, cpvc, or abs max vent length (feet) 4" pvc, cpvc, or abs 60 125,000 120 170 60 150,000 100 150 60 100 100 10...
Page 29
Multiple intake/exhaust terminal separation distances note: when installing multiple intake/exhaust terminals on the same wall of a building, the nearest intake terminal must be at least 5 feet from the nearest exhaust terminal. 29.
Page 30
Concentric vent terminal installation procedure warning improper installation, adjustment, service, or maintenance can cause property damage, personal injury, or death. Consult a qualified installer, service agency, or the gas supplier for information or assistance. This kit must be used only for te...
Page 31
Figure 21. Rain cap to small vent pipe ass’y 5. Install concentric y fitting and pipe assembly through the structure’s hole and field-supplied roof boot/flashing. Do not allow insulation or other materials to accumulate inside pipe assembly when installing through the hole. 6. Secure assembly to roo...
Page 32
Notice position termination where vent vapors will not damage plants/shrubs or air conditioning equipment. Position termination where vent vapors will not be adversely affected by wind condition. Position termination where it will not be damaged or be subjected to foreign objects. Position terminati...
Page 33
Initial preparation 1. Make sure the solvent cement you are planning to use is designed for the specific application you are attempting. 2. Know the physical and chemical characteristics and limitations of the pvc, pvc cellular core, abs or cpvc piping materials that you are about to use. 3. Know th...
Page 34
Caution the water heater and individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of the system at test pressures in excess of ½ psi (3.5 kpa). The water heater must be isolated from the gas supply piping system by closing its manual shutoff val...
Page 35
Section viii: electrical connections warning turn off or disconnect the electrical power supply to the water heater before servicing. Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. All...
Page 36
Section ix: operating instructions warning water heaters are heat-producing appliances. To avoid damage or injury there must be no materials stored against the water heater or direct vent system, and proper care must be taken to avoid unnecessary contact (especially by children) with the water heate...
Page 37
Lighting instructions figure 26. Lighting instruction label temperature adjustment the temperature selector knob of the thermostat has been adjusted to 120°f when shipped from the factory. Notice the lower the temperature setting, the greater the energy efficiency, both to heat the water and to main...
Page 38
Condensation does not mean your tank is leaking. Most of reported tank leaks on installation are proven to be condensation. To avoid unnecessary inconvenience and expense, make sure the tank is leaking before calling an independent servicing contractor or qualified service professional. Danger hotte...
Page 39
Section x: maintenance danger do not attempt to repair gas valve. Do not attempt to repair ignition module. Do not attempt to repair venturi. Do not attempt to repair thermostat board. Do not attempt to repair transformer. Do not attempt to repair pressure switch. General keep appliance area clear a...
Page 40
Draining water heater the water heater must be drained if it is to be shut down and exposed to freezing temperatures. Maintenance and service procedures may also require draining the water heater. 1. Turn off the water heater electrical disconnect switch. 2. Connect a hose to the drain valve. 3. Loc...
Page 41
Anode inspection and replacement this water heater is equipped with multiple sacrificial anodes. Anodes protect the glass-lined tank from corrosion by sacrificing themselves through electrolysis. When the anode material is consumed, there is no more protection and corrosion of the tank accelerates. ...
Page 42
Figure 28. Powered anode locations drain valve and tank access panel the water heaters are equipped with a ¾ inch drain valve. An access panel covers the cleanout opening in the tank, which is sealed by a gasket and cover. Relief valve at least twice a year, the temperature and pressure relief valve...
Page 43
Combustion system inspection inspect the operation of the combustion system monthly. Use the following procedure to inspect the combustion system. 1. Turn off the main power switch of the water heater. 2. Adjust the thermostat to the min. Setting. 3. Remove the top of the combustion surround by unla...
Page 44
Section xii: parts list 44 ultra high efficiency water heater 1 combustion surround ass'y 2 burner ass'y (specify model) 3 2nd pass top collector cover 4 screw 10-16 x 3/4 5 vent termination elbow 6 thermostat sensor probe 7 baffle 4” flue (specify model) 8a mag. Rod ass'y 8b powered anode (for 399)...
Page 45
Customer must specify complete model number and serial number when ordering service parts. 1 combustion surround ass'y aa keeper latch & catch bb screw 8-32 x 1/2 rhcr cc ignition control ass'y dd jacket head 28 1/4" grey ee switch main power ff potentiometer gg combustion surround jj surround bas/j...
Page 46
2 combustion ass'y (pictured previous page) 1a combustion ass’y (specify model) 15a gasket blower transition (specify model) 2a blower/gas valve ass’y (specify model) 16a screw 8 -32 x 1/4 rhcr 3a burner ass’y 17a gasket flame sensor 4a blower – ebm 18a flame sensor 5a silicone hose 19a transition t...
Page 47
Notes 47.
Page 48
Notes 48 800.900.9276 • 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 litho in u.S.A. © laars heating systems 080 6 ...