GAS PRESSURE REGULATOR
The gas pressure regulator is preset at 4.0 in. WC
throughout for natural gas, and 10.5 in. WC. for
propane gas. The pressure at the gas valve, taken
with a manometer, should be about 4.0 in. WC natural
gas and 10.5 in. WC propane gas. If an adjustment is
needed, remove seal and turn adjustment screw clock-
wise to increase pressure or counter-clockwise
to decrease pressure.
GAS PRESSURE ADJUSTMENT LOCATIONS
Gas Pressure
Adjustment
Honeywell VR8304
(Heater Models 268 and 408)
Gas Pressure
Adjustment
Robertshaw 7000 BDER
(Heater Model 268)
Gas Pressure
Adjustment
Robertshaw 7000 DERHC
(Heater Model 408)
PIPE SIZING FOR GAS CONNECTIONS
Maximum Equivalent Pipe Length (ft)
Natural Gas 1000 BTU/FT
3
0.60
Specific Gravity @ 0.5 in. WC Pressure Drop
Propane Gas 2500 BTU/FT
3
1.53
Specific Gravity @ 0.5 in. WC Pressure Drop
Input
3/4”
1”
1-1/4”
1-1/2”
Model (KBTU) N
P
N
P
N
P
N
P
268
266.0
15
35
50 125 210 480 445
408
399.0
*
15
20
55
95
225 215 480
MANOMETER
UNION
MANUAL
SHUT-OFF
VALVE
*A 3/4” gas line can be used for up to 5 ft maximum length from the
gas valve in addition to the sediment trap.
18
