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 (follow local codes if more stringent). Plastics or other PEX type plumbing line materials are not suitable for connecting directly to the water heater. Keep water inlet pipe to no less than ½” (19.05mm) diameter to allow the full flow capacity. If the cold and hot connections to the heater are reversed, the heater will not function.
The 125 HX is provided with one flexible type connector that must be connected to the cold inlet fitting of the water valve as shown in Fig. 6. The union end of the flexible connector should be attached to the rear inlet port of the water valve with the supplied washer gasket. No pipe dope or thread tape is to be used at this joint. The ½” flexible hot water outlet line is supplied attached to the heater.
Be certain there are no loose particles or dirt in the piping. Blow out or flush the lines before connecting to the water heater. Full port valves should be installed on both the cold water supply and hot water outlet lines to facilitate servicing the heater (see Fig. 7). For installation on a private well system with the use of a pressure tank, the lowest pressure range setting recommended is
Fig. 6 - Water valve - 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. 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.
Support all piping.
Pipe to
appropriate
discharge
HotCold
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 ( 
) 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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