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INSTALLATION AND OPERATING INSTRUCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
MODEL 125B LPS and 125B NGS (Thermostatically Modulated)
Suitable for heating potable water only
Not approved for space heating purposes
Intended for domestic hot water with preheated inlet water as with solar hot water.
WARNING
If the information in this manual is not followed exactly, a
fire or explosion may result causing property damage,
personal injury or d
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This well engineered, gas water heater has been specially AquaStar 125B LPS and 125B NGS Specifications designed to operate with incoming pre-heated water: It operates on the principle of heating water instantaneously Gas Input max.: 117,000 Btu/hr “on demand”. When a hot water faucet is opened, cold water min.: 23,400 Btu/hr flows through the coils of the heat exchanger in the Aquastar. This same flow opens the gas valve, and the burners are Water Connection 1/2” Thread fitting NPT ignited by
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FRONT VIEW SIDE VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS MODEL 125BS TOP (A) 12 " FRONT (B) 4 " BACK 0 " SIDES 4 " FLOOR (C) 12 " VENT DIAMETER 5 " AQUASTAR MODEL 125BS 6 720 606 518 3 D861_059
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GENERAL RULES TO FOLLOW PROPER LOCATION FOR INSTALLING YOUR FOR SAFE OPERATION HEATER 1. You should follow these instructions when you install your Carefully select the location of your new heater. For your heater. In the United States: The installation must conform safety and for proper heater operation, you must provide an with local codes or, in the absence of local codes, the abundant supply of combustion air and a proper venting National Fuel Gas Code ANSI Z223.1/NFPA 54. installation. In C
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WARNING: Flammable materials, gasoline, pressurized containers, or any other items or articles 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. COMBUSTION AIR REQUIREMENTS The AquaStar water heater holds cold water in its copper Air Vents heat exchanger and brass water valve when not in use. (10 ¾ X 10 ¾ in. each) 125BS Because of this, any cold ai
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The incandescent particle tray (shipped loose in the carton MOUNTING INSTALLATION with the water heater) must be attached at the bottom of the water heater front cover at the time of installation. Use The Aquastar 125 B “S” is design certified for mounting on the screws provided. See figure 2 a wall. Secure the two L shaped hooks provided with the heater to a wall surface. Place them 13 ¼ inches apart as shown in Fig 1. Do not install this appliance on a carpeted wall or over floor covering whi
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VENTING Vent pipe connection. WARNING: Do not reduce the vent pipe size. See Fig. 3 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 remo
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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. 3. 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 dryers, wood burning stoves, etc. Open all doors between the AquaStar and these other appliances. Run the unit for at least 10 minutes. Then hold an ordinary mirror at the side above the front shell. Any flue gases backdrafting will cause the mirror to fog. This is a serious health hazard and must be corrected. Po
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GAS CONNECTIONS and Gas Regulator NOTE: The Aquastar 125 B”S” is supplied with a gas pressure regulator that must be installed on the heater before attaching the gas supply line. See figure 5. Failure to install the gas regulator as shown in figure 5 will be a violation of CSA certification of the unit. The regulator supplied with the heater is preset for the gas shown on the rating plate to the correct pressure. It is an appliance level regulator designed for (low inlet) pressure (less than 1/
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GAS INLET PIPE The water heater must be isolated from the gas supply piping system by closing the manual shutoff valve during any pressure testing of the gas supply piping system at test PRESSURE TAP pressures equal to or more than 0.5 psig. The water heater, including the pressure regulator provided PLASTIC VENT CAP with it, must not be operated at gas supply pressures in excess of 0.5 psig. If overpressure has occurred, such as PRESSURE REGULA- through improper testing of the gas lines or mal
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Connecting the pressure relief valve (PRV) WHAT TO DO IF YOU SMELL GAS - Do not try to light any appliance. A listed pressure relief valve supplied with the heater must - Do not touch any electric switch; do not use any phone be installed at the time of installation. No valve is to be in your building placed between the PRV and the heater. No reducing - Immediately call your gas supplier from a neighbor’s coupling or other restriction may be installed in the discharge phone. Follow the gas suppl
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3mm INFORMATION ABOUT WATER TEMPERATURE The AquaStar 125B LPS and 125B NGS water heaters Correct gap between pilot have a gas control that modulates burner output in response burner tip and piezo electrode to water flow. Its purpose is to ensure that the hot water tip temperature will remain steady, although the water flow demand might vary (down to 1/2 gal/minute). The AquaStar Piezo Electrode 125 B”S” will produce a temperature rise of approximately 90°F at flow rates between 0.5 and 1.8 gallo
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If some burners have yellow flames while others have good 4. Air in the Gas Line flames, it is likely that dust, lint or spider webs have partially Note: Normally this is a problem only at the time of initial clogged the burner venturis. Contact a gas service person installation, after the pipes have been worked on, or after a to clean the remove and clean the burners. propane tank has been allowed to empty, or after the heater has been shut down for a long time. Mineral Scale Build-up: The Aqua
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To test the thermocouple, disconnect the thermocouple lead Any sign of moisture or corrosion at the joint of the water to the ECO. Insert a multi-meter probe into the thermocouple valve and the gas valve is a sign that the water valve assembly lead and attach or hold the other lead to the metal gas components need to be replaced immediately. valve (DC common). Light the pilot flame and hold button, meter reading should be 24 mVDC or more. If the reading is Note: Water valve for model 125B”S” is
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See specifications on page 2. Unlike storage tank water 3. Cold water is mixing with the hot water between the heaters, the burners of a tankless water heater must be very AquaStar and the outlet powerful to heat water instantaneously since they do this See #6 under “MAIN BURNERS DO NOT IGNITE WHEN only at the time hot water is actually being used. It is therefore HOT WATER TURNED ON”. imperative that the gas pressure requirement be met exactly. Insufficient gas pressure will directly affect the
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Fig. 10 - Diagram of AquaStar 125 BS 1 3 2 4 5 6 7 8 9 10 6. Gas valve 1. Heat exchanger 7. Piezo igniter 2. Pilot assembly 8. Location of pressure tap 3. Burner manifold gas screw pressure test nipple 9. Water valve 4. Main gas burner 10. Gas inlet gas pressure 5. Pilot gas tubing test nipple 6 720 606 518 17
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AQ 125 BS Fig. 11 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 18 6 720 606 518
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Fig. 11 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125BS 1 Cover 8 705 421 033 2 Cap cover 8 703 304 011 3 Water connection gasket 8 710 103 043 4 Draft divertor 8 705 505 354 5 Heat exchanger 8 705 406 189 6 Hot water pipe 8 700 705 431 7 Cold water pipe 8 700 705 294 8 Heat exchanger washer 8 710 103 045 9 Overheat sensor (ECO) 8 707 206 017 10 Main burner assembly 8 708 120 296 LP Main burner assembly 8 708 120 298 NG 11 Pilot burner assembly 8 718 105 051 11a Pi
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Fig. 12 - Flow chart of Aquastar 125 BS 20 6 720 606 518
