Lp Conversion - Rheem RGFE Installation Instructions Manual

LP CONVERSION

IMPORTANT: LP gas from trucks used
to transport liquid-based fertilizers can
contain chemicals that will damage the
furnace. Verify that your gas supplier
does not use the same truck to trans-
port materials other than LP.
This furnace is shipped from the facto-
ry for use on natural gas only. For use
on LP gas, a proper conversion is
required.
HG or HH Fuel Code (solenoid con-
trolled modulating valve):
Conversion of the furnace for use on
LP gas requires conversion kit RXGJ-
FP07. This kit includes an LP gas
valve.
HA or HB Fuel Code (stepper/servo
controlled modulating valve):
Conversion of the furnace for use with
LP gas requires conversion kit RXGJ-
FP27. (Gas valve not required.)
CAUTION
ELEVATIONS ABOVE 2000 FT
REQUIRE THAT THE FURNACE
INPUT RATING BE ADJUSTED AND
THAT THE SIZE OF THE BURNER
ORIFICES BE RE-CALCULATED
BASED ON ELEVATION AND GAS
HEATING VALUE. THE BURNER ORI-
FICES MAY (OR MAY NOT) NEED TO
BE CHANGED. SEE THE SECTION
TITLED "HIGH ALTITUDE INSTALLA-
TIONS" OF THIS BOOK FOR
INSTRUCTIONS.
NOTE: Order the correct LP conver-
sion kit available from the local distrib-
utor. Furnace conversion to LP gas
must be performed by a qualified
installer, service agency, or the gas
supplier.
To change orifice spuds for conversion
to LP:
1. Shut off the manual gas valve and
disconnect the gas line at the
union ahead of the unit gas valve.
FIGURE 45
SOLENOID CONTROLLED GAS VALVE
SUPPLY-LINE PRESSURE TAP
(FUEL CODE: HG OR HH)
42
2. Remove the gas valve and mani-
fold assembly.
3. Replace the orifice spuds.
4. a. For servo (stepper) controlled
gas valve (fuel code HA or HB):
Install the jumper supplied with
the kit into the valve as shown in
Figure 44. Make sure that the
jumper connects the two pins
and verify by checking manifold
pressure at high fire. It should
be approx. 11" w.c.
b. For solenoid controlled gas
valve (fuel code HG or HH):
Remove the natural gas valve
from the manifold assembly and
replace with the LP valve includ-
ed in the kit.
FIGURE 44
SERVO CONTROLLED GAS VALVE SUPPLY PRESSURE TAP AND LP JUMPER WELL
(FUEL CODE HA OR HB)
NOTE: REMOVE COVER TO
ADJUSTMENT WELL WHEN MAK-
ING ADJUSTMENTS. REPLACE
WHEN DONE.
NOTE: THE ADJUSTMENT WHEEL
WILL NOT STOP ROTATING
WHEN IT HITS THE MAXIMUM OR
MINIMUM POSITION. INSTEAD IT
WILL CONTINUE TO ROTATE TO
THE OPPOSITE ADJUSTMENT.
USE THE LETTERS ON THE
WHEEL AS A GUIDE.
SUPPLY-LINE
PRESSURE TAP
5. Re-attach the manifold assem-
bly to the unit and connect the
gas line to the gas valve.
6. Place the conversion label,
included in the kit, adjacent to
the CSA rating plate. Also for
servo controlled gas valves only
(fuel code HA or HB) be sure to
install the label titled "LP" over
the hole where the jumper is
inserted in Item 4 above.
7. Check unit for leaks.
8. Follow lighting instructions to
put the furnace into operation.
9. Check manifold pressure.
Consult Table 11, if there is any
question concerning orifice sizing.
LP JUMPER WELL
(INSERT JUMPER HERE)
ADJUSTMENT WELL
SUPPLY PRESSURE TAP
NOTE: LP orifices are included in
the kit but they may need to be
exchanged based on heating value
and/or elevation. LP orifices must be
selected based on the altitude of the
installation. See orifice chart.
NOTE ABOUT LP CONVERSION
OF STEPPER-CONTROLLED
MODULATING GAS VALVE: To
convert the stepper-controlled mod-
ulating gas valve, a jumper is
required to connect the two pins
inside the jumper well. It is possible
to install the jumper such that the
pins are not connected. This is
incorrect. The jumper must connect
the pins together inside the jumper
well. This can be confirmed by visu-
al inspection and by verifying proper
manifold pressure at high fire
(100%) after the jumper is installed.
Manifold pressure should always be