WATER CONNECTIONS
When facing the heater, the cold water inlet is on your right and the hot water outlet is on your left.
Although water piping throughout your structure may be other than copper, we recommend that copper piping be used for at least three feet before and after the heater (follow local codes if more stringent). Keep water inlet pipe to no less than 1/2 inch diameter to allow the full flow capacity. Remember that water pressure must be sufficient to activate the heater when drawing hot water from the top floor. If the hot and cold connections to the heater are reversed, the heater will not function. The AquaStar 125X is provided with two flexible type connectors that must be connected to the inlet and outlet fittings of the water valve as shown in Figs 5 and 6. ½” Galvanized or brass fittings work best when connected to the connectors. See Fig 6. These connectors seal to the water valve by means of a union connection with a washer type gasket at the joint. No pipe dope or thread tape is to be used at these joints. Be certain there are no loose particles or dirt in the piping. Blow out or flush the lines before connecting to the AquaStar. Full port valves should be installed on both the cold water feed line and the hot water outlet line to facilitate servicing the heater.
For installation on a private well system, be sure that the water pressure is set between 30 and 50 psi.
INLET 
WASHER
WATER FILTER
WATER VALVE
FLEX
CONNECTORS
WASHER
OUTLET
Fig. 5 - Water valve and water connectors, top view
THREADEDASSEMBLY SWEATED ASSEMBLY
1/2” FLEX | 1/2” FLEX |
S FITTING
PIPE PRV TO | PIPE PRV TO |
APPROPRIATE | APPROPRIATE |
DISCHARGE | DISCHARGE |
Fig. 6 - Plumbing connections for the Aquastar 125X
Connecting the pressure relief valve (PRV)
A listed pressure relief valve supplied with the heater must be installed at the time of installation. No valve is to be placed between the PRV and the heater. No reducing coupling or other restriction may be installed in the discharge line. The discharge line must be installed such that it allows complete drainage of both the PRV and the line.
The location of the PRV must be readily accessible for servicing or replacement., and be mounted as close to the water heater as possible. See Fig 7. To install the PRV, a suitable fitting connected to an extension on a “T” fitting can be sweated to the hot water line.
Pressure
Relief
Valve
HWS | CWS |
Fig. 7 - Pressure Relief Valve
OPERATING INSTRUCTIONS
Before proceeding with the operation of the heater make sure that the system is filled with water.
Open the cold water inlet supply to the heater fully. Open a hot water faucet to permit the water to fill the heater and the piping and to eliminate the air trapped in the system Close the hot water faucet after the water flows freely and all the air has escaped from the system. The water heater is now ready to operate.
FOR YOUR SAFETY READ BEFORE OPERATING YOUR HOT WATER HEATER
Warning: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life.
A.This appliance is equipped with electronic ignition for lighting the pilot and main burners. When turning the heater on, follow these instructions exactly.
B.Before operating the unit, set the On/Off switch to the On (I) position. The On/Off switch is located behind the
WHAT TO DO IF YOU SMELL GAS - Do not try to light any appliance.
- Do not touch any electric 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.
C.Use only your hand to push in the on/off control button. Never use tools. Follow these instructions exactly. If control button is jammed, close the gas supply and call a qualified service technician. Attempted forceful repair may result in a fire or explosion.
D.Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control
system and any gas control which has been under water.
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