Gas Supply Connections - Raypak VERSA 155C Operating And Installation Instructions

GAS SUPPLY CONNECTIONS

Gas piping must have a sediment trap ahead of the
heater gas controls, and a manual shut-off valve lo-
cated outside the heater jacket. All gas piping should
be tested after installation in accordance with local
code
s.
Manual Shut-Off
Valve
Gas Inlet
Sediment Trap
CAUTION: The heater and its manual shut off valve
must be disconnected from the gas supply during any
pressure testing of that system at test pressures in
excess of 1/2 psig (3.45 KPA). Dissipate test pressure
in the gas supply line before reconnecting the heater
and its manual shut off valve to gas supply line.
FAILURE TO FOLLOW THIS PROCEDURE MAY
DAMAGE THE GAS VALVE. OVER PRESSURED
GAS VALVES ARE NOT COVERED BY 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 thread.
A flexible sealant is recommended.
A minimum of 7" W.C. and a maximum of 14" W.C.
upstream pressure under load, and no load conditions
must be provided for natural gas or a minimum of 12"
W.C. and a maximum of 14" for propane gas.
GAS PRESSURE REGULATOR
The gas pressure regulator is present and sealed
at 4"W.C. for natural gas, and 11"W.C. for propane
gas. Between the gas valve and the burners is a 1/8"
pipe plug. The pressure at this point , taken with a
manometer, should be about 3.7"W.C. natural gas
and 10.5"W.C. propane
needed, remove seal and
clockwise
to increase pressure or counter-clockwise
to decrease pressure.
Heater Jacket
Gas Valve
Union
Fig. # 8090.0
gas. If an adjustment is
turn adjustment screw
Manometer
Gas Pressure
Test Upstream
Manual Shut
Off Valve
Gas Valve
Gas Pressure Test at Heater
ROBERTSHAW VALVE
W. C. adjustment
HONEYWELL VALVE
PIPE SIZING FOR GAS CONNECTIONS
MAXIMUM EQUIVALENT PIPE LENGTH
Natural Gas 1000BTU/FT
@ 0.5" WC Pressure Drop
Propane Gas 2500BTU/FT
@ 0.5" WC Pressure Drop
1/2"
MODEL
N P
15 35
155B
14
Gas Pressure Test
at Gas Valve
W. C. adjustment
.60 Specific Gravity
3
1.53 Specific Gravity
3
3/4"
N P N
60 145 200
Fig. # 8149.0
Fig. # 8081.0
1"
P
500