General Instructions
A manual water control valve must be placed in the water inlet connection to the water heater before it is connected to the water line. Unions may be used on both the hot and cold water lines for future servicing and disconnection of the unit.
•The piping (including soldering materials) and components connected to this appliance must be approved for use in potable water systems.
•Purge the water line to remove all debris and air. Debris will damage the water heater.
•Toxic chemicals such as those used for boiler water treatment are not to be introduced to the potable water used for space heating.
•If the appliance will be used as a potable water source, it must not be connected to a system that was previously used with a nonpotable water heating appliance.
•Ensure that the water filter on the water heater is clean and installed (See Flushing the Heat Exchanger).
Pressure Relief Valve
•An approved pressure relief valve is required by the American National Standard (ANSI Z21.10.3) / Canadian Standard (CSA 4.3) for all water heating systems.
•The relief valve must comply with the standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems ANSI Z21.22 and /or the standard Temperature, Pressure, Temperature and Pressure Relief Valves and Vacuum Relief Valves,
•The relief valve must be rated up to 150 psi and to at least the maximum BTU/hr of the appliance.
•The discharge from the pressure relief valve should be piped to the ground or into a drain system to prevent exposure or possible burn hazards to humans or other plant or animal life. Follow local codes. Water discharged from the relief valve could cause severe burns instantly, scalds, or death. (See Figure 4)
•The pressure relief valve must be manually operated once a year to check for correct operation.
•The relief valve should be added to the hot water outlet line according to the manufacturer's instructions. DO
NOT place any other type valve or shut off device between the relief valve and the water heater.
Do not plug the relief valve and do not install any reducing fittings or other restrictions in the relief line
The relief line should allow for complete drainage of the valve and the line.
If a relief valve discharges periodically, this may be due to thermal expansion in a closed water supply system. Contact the water supplier or local plumbing inspector on
how to correct this situation. Do not plug the relief valve.
•Neither this water heater nor the American National Standard (ANSI Z21.10.3) / Canadian Standard (CSA 4.3) requires a combination temperature and pressure relief valve for this appliance. However, local codes may require a combination temperature and pressure relief valve.
Freezing Protection
The freeze protection features include electrical heating elements and intermittent firing of the burner. Freeze protection may be disabled if electricity or gas is not supplied, or if there is an error preventing the water heater from functioning. Loss of freeze protection may
result in water damage from a burst heat exchanger or water lines.
The installation of auto drain down solenoid valves is optional. However, it is strongly recommended that these valves be installed to prevent damage from freezing in case the normal freeze protection should become disabled. Any product damage due to freezing will not be covered by the warranty.
In addition, the solenoid valves should be connected
electrically to a surge protector with terminals that attaches to the PC board in the unit. This allows the
solenoid valves to operate if the water heater is disabled due to an error code.
The solenoid valves and the surge protector with terminals are available for purchase separately.
NOTICE: Warranty does not cover damage due to freezing.
When electrical power and gas are supplied to the water heater, it will not freeze in environments as cold as
The unit may be drained manually. However, it is highly recommended that drain down solenoid valves be
installed that will automatically drain the unit if power is
lost. It is also recommended that a surge protector with terminals be installed that attaches to the PC board in
the unit and allows the solenoid valves to operate if the unit is disabled due to an error code.
When the electrical power to the water heater fails, the 3/4" solenoid valve closes (stopping the flow of water into the heater) and the 1/2" solenoid valve opens (allowing the water heater and associated piping to drain. Ensure that you run the drain for the solenoids to the outside environment to prevent discharging water inside the building causing water damage).
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