Raypak 0195A Water Connections & System Piping, Gas Pressure Specifications, Type of, Inches WC

Gas Pressure Specifications

Type of	Inches WC		Regulator
Gas	Min.	Max.*	Setting
Natural	4.5	10.5	3.5
Propane	12.0	13.0	11.0

*Do not exceed maximum inlet gas pressure. The minimum value shown is for input adjustment.

Table G: Gas Pressure Specifications

Gas Pressure Regulator

The gas valve is provided with pressure taps to meas- ure gas pressure upstream of the gas valve and downstream which is the same as the manifold pres- sure.

Water Connections & System Piping

The pipe size and fittings between the heater and the tank should be at least 1" for model 0090, and 1-1/4" for models 0135 and 0195. This is based on the tank being located as close to the heater as possible, as shown in Fig. 7 below.

If this water heater is installed in a closed water supply system, such as one having a back-flow preventer in the cold water supply line, means shall be provided to control thermal expansion. Contact the water heater supplier or local plumbing inspector on how to control this situation.

Fig. 7: Heater with Storage Tank

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