Rheem RGPH Installation Instructions Manual page 18

LP CONVERSION
The valve can be converted to use
liquefied petroleum (LP) gas by
replacing the pressure regulator spring
with the conversion kit spring. This LP
kit spring allows the regulator to
maintain the proper manifold pressure
for LP gas. The correct burner LP
orifices are included in
the kit. See Figure 14.
NOTE: Order the correct LP conversion
kit from the furnace manufacturer.
Furnace conversion to LP gas must
be performed by a qualified
technician.
To change orifice spuds for either
conversion to LP or for elevation:
1. Shut off the manual main gas
valve and remove the gas
manifold.
2. Replace the orifice spuds.
3. Reassemble in reverse order.
Consult the tables at right if there is any
question concerning orifice sizing.
4. Turn the gas supply back on and
check for proper operation and
manifold pressure.
5. Attach the notice label alerting the
next service technician that the
furnace has been converted to LP
gas.
NOx MODELS
When converting furnaces equipped
with NOx inserts to LP gas, remove the
NOx insert assemblies. Steps for
removal are listed below:
1. Turn off all electrical power and the
gas supply to the furnace.
2. Remove the burner door from the
furnace.
3. Remove the igniter assembly –
handle with care.
4. Remove the two screws attaching
the NOx insert retainer brackets to
the center panel. Pull the retainer
rod.
5. Put the two screws back into the
holes in the center panel.
6. Re-install the igniter and burner
assemblies.
7. Replace burner door.
8. Turn on electrical power and gas
supply to the unit.
18
ORIFICE SIZING CHART
RATING PLATE
INPUT
BTU/HR 0 TO 7,999 FT.
HEATING VALUE @ 1,000 BTU/FT
NATURAL GAS
45,000
50,000
67,500
75,000
100,000
125,000
150,000
HEATING VALUE @ 2,475 BTU/FT
L.P. GAS
45,000
50,000
67,500
75,000
100,000
125,000
150,000
ORIFICE SIZING CHART (CANADA)
RATING PLATE
INPUT
BTU/HR 0 TO 1,999 FT.
HEATING VALUE @ 1,000 BTU/FT
NATURAL GAS
45,000
50,000
67,500
75,000
100,000
125,000
150,000
HEATING VALUE @ 2,475 BTU/FT
L.P. GAS
45,000
50,000
67,500
75,000
100,000
125,000
150,000
ELEVATION
8,000 FT. AND ABOVE
3 , SPECIFIC GRAVITY 0.62
MANIFOLD PRESSURE @ 3.5 W.C.
43
42
43
42
42
42
42
3 , SPECIFIC GRAVITY 1.52/
MANIFOLD PRESSURE @ 10 W.C.
54
54
54
54
54
54
54
ELEVATION
2,000 FT. TO 4,500 FT.
3 , SPECIFIC GRAVITY 0.62
MANIFOLD PRESSURE @ 3.5 W.C.
43
42
43
42
42
42
42
3 , SPECIFIC GRAVITY 1.52/
MANIFOLD PRESSURE @ 10 W.C.
54
54
54
54
54
54
54
45
43
45
43
43
43
43
55
55
55
55
55
55
55
45
43
45
43
43
43
43
55
55
55
55
55
55
55