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INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
MODEL 125B LP and 125B NG (Flow Modulated)
Suitable for heating potable water only
Not approved for space heating purposes
Intended for variable flow applications with steady cold water inlet temperatures only
WARNING
If the information in this manual is not followed exactly, a
fire or explosion may result causing property damage,
personal injury or death.
FOR Y
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This well engineered, gas water heater has all the fea- AquaStar 125B LP and 125B NG Specifications tures a water heater should have: It operates on the principle of heating water instantaneously “on demand”. When a hot water faucet is opened, cold water Gas Input max.: 117,000 Btu/hr flows through the coils of the heat exchanger in the Aquastar. min.: 28,000 Btu/hr This same flow opens the gas valve, and the burners are ignited by the pilot flame. The heat exchanger coils absorb Water Connec
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FRONT VIEW SIDE VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS MODEL 125B TOP (A) 12 " FRONT (B) 4 " BACK 0 " SIDES 4 " FLOOR (C) 12 " VENT DIAMETER 5 " AQUASTAR MODEL 125B 6 720 607 030 3
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GENERAL RULES TO FOLLOW PROPER LOCATION FOR INSTALLING YOUR FOR SAFE OPERATION HEATER Carefully select the location of your new heater. For your 1. You should follow these instructions when you install your safety and for proper heater operation, you must provide an heater. In the United States: The installation must conform abundant supply of combustion air and a proper venting with local codes or, in the absence of local codes, the installation. National Fuel Gas Code ANSI Z223.1/NFPA 54. The
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Air Vents 125B (10 ¾ X 10 ¾ in. each) Fig. 1 - Water heater drain plug WARNING: Flammable materials, gasoline, Air Vents 125B pressurized containers, or any other items or articles (5 ½ X 5 ½ in. each) that are potentially fire hazards must NOT be placed on or adjacent to the heater. The appliance area must be kept free of all combustible materials, gasoline and other flammable vapors and liquids. Appliances located in confined spaces: The confined space must be provided with two permanent COM
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Note: Typically, the minimum clearence to combustible The incandescent particle tray (shipped loose in the carton with the water heater) must be attached at the bottom of materials should not be less than 6“ for single wall flue the water heater front cover at the time of installation. Use pipe. Note that this clearance can be reduced if combustible the screws provided. See figure 3 materials are protected as per table VI of the National Fuel Gas Code or if Type B gas vent is used. MOUNTING INS
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VENTING Vent pipe connection. WARNING: Do not reduce the vent pipe size. See Fig. 4 for high altitude installations The heater must be vented to the outside following all local ordinances and specifications for installing a gas appliance vent or chimney. The heater must be located as close as practicable to a vertically rising chimney or vent that has a listed vent cap at its termination point. The venting system must be designed and constructed so as to develop a positive flow adequate to r
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MASONRY CHIMNEY: Masonry chimneys shall be built and installed in accordance with NFPS 211 or local codes. A minimum 5” diameter gas vent pipe (metal double wall Type B), or an approved clay flue liner or a listed chimney lining system must be used when venting into a naturally drafting, internal masonry chimney. 6 inch is required in elevations greater than 2000 feet, see Fig. 4. Local codes may require the use of both gas vent and an approved lining system when venting into a masonry chimney.
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To check the draft: Close all doors and windows to the outside. Turn on all appliances that force air out of the building. These include all exhaust/ventilation fans, furnaces, clothes 5” X 6” ADAPTOR dryers, wood burning stoves, etc. USED ON HIGH ALTITUDE Open all doors between the AquaStar and these other appliances. With the control knob set fully clockwise and strong hot water flow rate, run the unit for at least 10 minutes. The 125B is equipped with a Flue Gas Sensor; it’s mounted on the r
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GAS LINE SIZING GAS CONNECTIONS -It is strongly recommended that the Natural Gas pipe be Black Iron pipe the entire distance from the outside meter to the inlet of the Aquastar regulator. 1/2” Black NOTE: The Aquastar 125 B is supplied with a gas pressure Iron pipe up to 10 feet, 3/4” Black Iron pipe up to 40 feet regulator that must be installed on the heater before and 1” Black Iron pipe up to 150 feet distances. Flex line attaching the gas supply line. See fig. 5. Failure to install tubing is
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GAS PIPING, CONNECTIONS and Gas Regulator Before connecting the gas supply, check the rating plate on the right side of the front cover to be sure that the heater is rated for the same gas to which it will be connected. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54. In Canada: The Installation should conform with CGA B149 INSTALLATION CODES and /or local installation codes. GAS LINE SIZING FO
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WATER CONNECTIONS Install the heater centrally in the building if possible and make hot water piping runs as short as possible When facing the heater, the cold water inlet will be on the right and the hot water outlet on the left.. Although water piping throughout the building may be other than copper, copper or galvanized piping should be used when connecting to the heaters ½” male NPT flex connectors PIPE PRV TO (follow local codes if more stringent). Plastics or other PEX APPROPRIATE DISCHARG
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LIGHTING INSTRUCTIONS (as seen on front cover of heater) GAS CONTROL SLIDE 1. STOP! Read the safety information above on this plate. 2. The Gas valve must be turned off by sliding the gas valve button to the far left under the OFF ( ) mark. TEMPERATURE ADJUSTMENT KNOB 3. Wait five (5) minutes to clear out any gas. If you smell gas, STOP! Follow “B” in the safety information above on this plate. If you don’t smell gas, go to next step. Fig. 9 - Water Flow Control Knob 4. The pilot burner is loca
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Water Valve (Part # 8707002649): The water valve on this heater should be serviced periodically. Lubricate component #23 on page 19 with a small amount of silicon, faucet or lithium grease every two years to keep its o rings AIR SCREEN fresh and pushrod sliding smoothly. Every 3-5 years replace component #23 on page 19. The frequency will depend on the mineral content of the water and conditions of use or whenever signs of corrosion appear at the gas and water valve joint. Periodically check th
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PILOT LIGHT WILL NOT LIGHT 3. Poor thermocouple connection at the electromagnet Note: Electromagnet is part #8707201012 located on the 1. No gas to the AquaStar right side of the gas valve behind the piezo push-button A. Gas cock on gas line may not be open. assembly. Check the tightness of the thermocouple B. Gas valve button has not been moved to single flame connection nut at the electromagnet: The Electro-magnet position ( ). Slide button to right to PILOT. connection is a large aluminu
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5. Crossover in household plumbing WATER IS TOO HOT The AquaStar burner activates when there is sufficient water 1. Temperature Selection too high pressure drop in the AquaStar water valve assembly — i.e. Position the gas control slide to the single flame ( ) when a hot water faucet is opened. If there is a crossover in setting to reduce the burner output and/or turn the the plumbing, the necessary pressure drop in the AquaStar temperature adjustment knob counterclockwise to lower the will b
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HOT WATER TEMPERATURE FLUCTUATES / UNIT DEACTIVATED 1. Unbalanced pressure in waterlines The added restriction caused by the Aquastar in the hot water system can result in uneven pressures between the cold and the hot. In such cases when mixing cold water at the tap, the lower hot water pressure may be overpowered by the higher cold water pressure in the building, which may cause the Aquastar burners to shut down (deactivate). Do not add any flow restrictor to the shower head. Position the gas c
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18 6 720 607 030
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Fig. 12 - Diagram of AquaStar 125 B 1 3 2 4 5 6 7 9 8 10 11 13 12 6720606800-07.1AL 1. Heat exchanger 8. Gas control slide 2. Pilot assembly 9. Piezo igniter 3. Burner manifold gas 10. Water valve pressure test nipple 11. Temperature adjustment 4. Main gas burner selector 5. Pilot gas tubing 12. Gas inlet gas pressure test 6. Gas valve nipple 7. Pressure tap screw 13. Flexible hot outlet location 6 720 607 030 19
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Fig. 13 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 20 6 720 607 030
