GAS PRESSURE REGULATOR
The gas pressure regulator is preset at 4.0 in. WC for
natural gas (3.1 in. WC for Lo NOx), 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 (3.1 in. WC for Lo NOx) and 10.5 in. WC propane
gas. If an adjustment is needed, remove seal and turn
adjustment screw clockwise to increase pressure
o
r counter-clockwise to decrease pressure.
NOTE: Lo NOx gas valves are non-adjustable; set-
tings are fixed by the manufacturer
(Invensys/Robertshaw).
20
GAS PRESSURE ADJUSTMENT LOCATIONS
MILLIVOLT GAS VALVES
ELECTRONIC IGNITION GAS VALVES
Gas Pressure
Adjustment
Gas Pressure
Adjustment
Robertshaw 7000
(Heater Models 206-406)
Honeywell VR8304
(Heater Models 206-
406 and 207-407)
ELECTRONIC IGNITION GAS VALVES-CONTINUED
Gas Pressure
Adjustment
Robertshaw 7200
(Heater Model 206)
Robertshaw 7000 BDER
(Heater Models 266-336)
Gas Pressure
Adjustment
Robertshaw 7000 DERHC
(Heater Model 406)
PIPE SIZING FOR GAS CONNECTIONS
Robertshaw 7000 BDERF
(Heater Models 207-407)
Non-Adjustable
Gas Valve
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
3/4” 1” 1-1/4” 1-1/2”
Model N P N P N P N P
206/207 25 60 90 215 360
266/267 15 35 50 125 210 480 445
336/337 10 20 30 80 140 320 290
406/407 * 15 20 55 95 225 215 480
*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.
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