Gas Pressure Regulator; Gas Pressure Adjustment Locations; Pipe Sizing For Gas Connections - Rheem P-M206 Instructions Manual

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
sure or counter-clockwise
NOTE: Lo NOx gas valves are non-adjustable; set-
tings are fixed by the manufacturer
(Invensys/Robertshaw).
MANUAL
SHUT-OFF
VALVE
UNION

GAS PRESSURE ADJUSTMENT LOCATIONS

MILLIVOLT GAS VALVES
Robertshaw 7000
(Heater Models 206-406)
ELECTRONIC IGNITION GAS VALVES
Gas Pressure
Adjustment
Honeywell VR8304
(Heater Models 206-
406 and 207-407)
to increase pres-
to decrease pressure.
MANOMETER
GAS PRESSURE TEST
AT GAS VALVE
Gas Pressure
Adjustment
ELECTRONIC IGNITION GAS VALVES-CONTINUED
Gas Pressure
Robertshaw 7200
(Heater Model 206)
Robertshaw 7000 DERHC
(Heater Model 406)
Robertshaw 7000 BDERF
(Heater Models 207-407)

PIPE SIZING FOR GAS CONNECTIONS

Maximum Equivalent Pipe Length (ft)
Natural Gas 1000 BTU/FT
Specific Gravity @ 0.5 in. WC Pressure Drop
Propane Gas 2500 BTU/FT
Specific Gravity @ 0.5 in. WC Pressure Drop
Input 3/4"
Model (KBTU) N
206/207 199.5 25
266/267 266.0 15
336/337 332.5 10
406/407 399.0 *
*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.
20
Adjustment
Robertshaw 7000 BDER
(Heater Models 266-336)
Gas Pressure
Adjustment
Non-Adjustable
Gas Valve
3
0.60
3
1.53
1" 1-1/4"
P N P N P
60 90 215 360
35 50 125 210 480 445
20 30 80 140 320 290
15 20 55 95 225 215 480
1-1/2"
N P