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Water connections & system piping – Raypak WH 0195A User Manual

Page 12

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12

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.

Type of

Gas

Inches WC

Regulator

Setting

Min.

Max.*

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

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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