Raypak B-195 - Manual (Page 8)

GAS PIPING
The gas inlet pipe size is 1/2" NPT to the gas valve.
Provide an adequate size gas supply line. The line
should not be smaller than 1/2" NPT according to the
chart below.
MAXIMUM EQUIVALENT PIPE LENGTH (FEET)
Pipe Size
Gas 1/2" 3/4" 1"
Natural 5 30 100
Propane 70 180
Gas piping must have a sediment trap ahead of the
heater gas controls and a manual shut-off valve lo-
cated outside the jacket. A manual shut-off valve is
provided loose and must be installed at the site.
Fig. # 8984
GAS PRESSURE SPECIFICATIONS
Inches W.C.
Gas Min Max Manifold
Natural 4.5 10.5 3.5
Propane 11.0 14.0 10.0
The maximum inlet gas pressure must not exceed
the value shown above. The minimum gas pressure
shown is for the purposes of input adjustment.
The gas valve is provided with a pressure tap to
measure the gas pressure downstream, which is also
the manifold pressure.
WATER PIPING
The inlet and outlet water connections are 3/4 in.
NPT. A water pressure regulator is shipped loose with
the heater. Install, as needed, between the booster
heater and dishwasher lines. Adjust setting to maintain
20 PSI at the dishwasher.
Install a suitable water hammer arrester be-
tween the booster heater and dishwasher, as shown
on page 10, typical piping.
The heater and its gas connection shall be leak
tested before placing the heater in operation.
The heater and its individual shut-off valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.5 kPa).
The heater must be isolated from the gas supply
piping system by closing its individual manual shut-off
valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than
1/2 psig (3.5 kPa).
Dissipate test pressure from the gas supply line
before re-connecting the heater and its manual shut-off
cock to the gas supply line. FAILURE TO FOLLOW
THIS PROCEDURE MAY DAMAGE THE GAS VALVE.
OVER PRESSURED GAS VALVES ARE NOT COV-
ERED BY THE WARRANTY. The heater and its gas
connections shall be leak tested before placing the
appliance in operation. Use soapy water for leak test.
DO NOT use open flame.
NOTE: DO NOT use teflon tape on gas line pipe
threads. A flexible sealant suitable for use with Natural
and Propane gases is recommended.
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