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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)
Intended for domestic hot water with preheated inlet water as with solar hot water. For domestic hot water
applications with cold water inlet, install the 125B model. For constant flow, recirculating applications,
WARNING
: Improper installation, adjustment,
alteration, service or maintenance can cause injury
or property damage. Refer to this manual. For
assistance or additional information consult a
qualified installer, service agency or the gas supplier.
Upon completion of the installation, these instructions
should be handed to the user of the appliance for
future reference.
FEATURING: Automatic Variable Power Modulating Gas
Valve with Thermostatic Control
Warning: If you do not follow these instructions exactly, a
fire or explosion may result causing property damage,
personal injury or loss of life.
Suitable for water (potable) heating
install the 125BL model.
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 YOUR SAFETY
Do not store or use gasoline or other flammable,
combustible or corrosive 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 the gas supplier.
TABLE OF CONTENTS
Specifications .................................................... Page 2
Rules for safe operation .................................... Page 4
Locating the Heater ........................................... Page 5
Combustion Air Requirements ........................... Page 5
Mounting the Heater .......................................... Page 6
Venting the Heater ............................................. Page 6
Gas Connections ............................................... Page 7
Water Connections ............................................ Page 7
Safety before lighting the pilot ............................ Page 8
Lighting instructions ........................................... Page 8
Information on water temperature ...................... Page 9
Trouble Shooting ............................................. Page 10
Diagram of AquaStar ....................................... Page 13
Components and Parts List ............................. Page 14
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Summary of Contents for AquaStar 125B LPS
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Page 1: Table Of Contents
INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND LIQUEFIED PETROLEUM GAS MODEL 125B LPS and 125B NGS (Thermostatically Modulated) Suitable for water (potable) heating Intended for domestic hot water with preheated inlet water as with solar hot water. For domestic hot water applications with cold water inlet, install the 125B model. -
Page 2: Specifications
Each time you turn off your hot water faucet, you also shut off the water heater. On the Aquastar “S” model, if the incoming water is colder than the thermostat... - Page 3 FRONT VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE INSTALLATIONS AQUASTAR MODELS 125B / 125BL / 125BS / 125X MODEL 125B / 125B LOW PRESSURE / 125B SOLAR / 125X TOP (A) FRONT (B) BACK SIDES...
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Page 4: Rules For Safe Operation
Confirm that your Aquastar is venting properly when all these other appliances are running. See section on venting. -
Page 5: Combustion Air Requirements
50 cubic feet per 1000 Btu per hour of the combined rating of all appliances installed in the space. That would be 5850 cubic feet for the AquaStar 125B “S” alone. b) In unconfined spaces in buildings of conventional frame,... -
Page 6: Mounting The Heater
WALL STUDS WARNING Note: The burners of an instantaneous “on demand” water heater such as the AquaStar are only on at the time that SUPPORT BOARD hot water is actually being used, the venting stack is therefore cold except for the short durations when hot water... -
Page 7: Gas Connections
In Canada: The Installation should conform with CGA B149 INSTALLATION CODES and /or local installation codes. 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 4. -
Page 8: Safety Before Lighting The Pilot
For installation on a private well system, be sure that the water pressure is set between 30 and 50 psi. Fig. 5 - Water valve and “S” water con- nectors, top view Connecting the pressure relief valve (PRV) A listed pressure relief valve supplied with the heater must be installed at the time of installation. -
Page 9: Information On Water Temperature
Depress the OFF button ( ) and close the main gas valve by turning the handle clockwise ( INFORMATION ABOUT WATER TEMPERATURE The AquaStar 125B LPS and 125B NGS water heaters have a gas control that modulates burner output in response to water flow. Its purpose is to ensure that the hot water temperature will remain steady, although the water flow demand might vary (down to 1/2 gal/minute). -
Page 10: Trouble Shooting
Energy for instructions. TROUBLE SHOOTING Introduction The AquaStar 125 B “S” burners are activated by a water flow valve. Numerous water related problems can cause this water valve to malfunction such as: Insufficient water flow volume to activate the burners at its minimum flow requirement;... - Page 11 — ie. when a hot water faucet is opened. If there is a crossover in the plumbing, the necessary pressure drop in the AquaStar will be insufficient, or totally eliminated. A plumbing crossover can be caused by a bad washer at a single lever faucet or incorrect plumbing or a mixing valve in the line, etc.
- Page 12 AquaStar’s outlet pipe with your hand) and at the tap. If these two are very different, check for mixing valve or plumbing crossover (see “MAIN BURNERS WILL NOT IGNITE...” paragraph #6). 6. Parts in water flow valve are corroded so that the gas passage is not fully opening.
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Page 13: Diagram Of Aquastar
Fig. 10 - Diagram of AquaStar 125 B”S” Heat exchanger Pilot assembly Burner manifold gas pressure test nipple Main gas burner Pilot gas tubing Gas valve Piezo igniter Location of pressure tap screw Water valve Gas inlet gas pressure test nipple... -
Page 14: Components And Parts List
AQ 125 BS Fig. 11 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST... - Page 15 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125BS Cover Cap cover Panel back Draft divertor Heat exchanger Hot water pipe Cold water pipe Heat exchanger washer Overheat sensor (ECO) Main burner assembly LP Main burner assembly NG Pilot burner assembly Pilot filter screen Piezo electrode Pilot orifice NG Pilot orifice LP...
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Page 16: Installation Checklist
Nominal Iron Pipe Size* MAXIMUM LENGTH Semi-rigid Tubing MAXIMUM LENGTH * Flex tubing greatly reduces capacity and, therefore, is not recommended. Minimum Vent Size* and Height Minimum Diameter 5 inches * NOTE: Vent size must not be restricted. Installation must comply with national fuel gas code venting requirements for a 117,000 Btu Category I appliance and any applicable local codes.