The gas valve is provided with pressure taps to measure gas pressure upstream of the gas valve and downstream which is the same as the manifold pressure.
WATER CONNECTIONS & SYSTEM PIPING
The pipe size and fittings between the heater and the tank should be at least 1" for model 90, and
Hot Water Supply | T & P Relief Valve |
|
Thermometer
Cold Water
Recirculation Water
Check Valve
Thermostat
Pump
Pressure Relief Valve
If this water heater is installed in a closed water supply system, such as one having a
When this water heater system is supplying general purpose hot water requirements for use by individuals, a thermostatically controlled mixing valve is recommended to reduce the risk of scald injury. Contact a licensed plumber or the local plumbing authority for further information.
Thermometer(s) should be installed so that they indicate the water temperature at or near the outlet of the storage tank.
RELIEF VALVE
A new combination temperature and pressure (T & P) relief valve, complying with the Standard for Relief Valves and Automatic Gas Shut Off Devices for Hot Water Supply Systems, ANSI Z21.22, must be installed in the opening provided on top of the storage tank, at the time of installation. No valve is to be placed between the relief valve and the storage tank.
The pressure rating of the relief valve must not exceed the 160 maximum working pressure indicated on the water heater rating plate. The BTUH rating of the relief valve must not be less than the BTUH input of the heater.
Connect the outlet of the relief valve to a suitable open drain. The discharge line must pitch downward from the valve to allow complete draining (by gravity) of the relief valve and discharge line. The discharge line should be no smaller than the outlet of the valve. The end of the discharge line should not be threaded or concealed, and should be protected from freezing. No valve of any type, restriction or reducer coupling, should be installed in the discharge line. Local codes shall govern installation of relief valve.
10
