Lp Conversion - Rheem RGFG 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.
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.
High altitude installations above 5,000
feet are not permitted with RGFG fur-
nace models.
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.
2. Remove the gas valve and mani-
fold assembly.
3. Replace the orifice spuds.
4. For servo (stepper) controlled gas
valve (fuel code HA or HB): Install
the jumper supplied with the kit
into the valve as shown in Figures
25 and 27. Make sure that the
jumper connects the two pins and
verify by checking manifold pres-
sure at high fire. It should be
approx. 11" w.c.
5. Re-attach the manifold assembly
to the unit and connect the gas
line to the gas valve.
6. Place the conversion label, includ-
ed in the kit, adjacent to the CSA
rating plate. Also for servo con-
trolled 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 Tables 13 (U.S.) and 14
(Canada), if there is any question con-
cerning orifice sizing.
NOTE: LP orifices are included in the kit
but they may need to be exchanged
based on heating value and/or eleva-
tion. LP orifices must be selected based
on the altitude of the installation. See
orifice chart.
FIGURE 25
SERVO CONTROLLED GAS VALVE SUPPLY PRESSURE TAP AND LP JUMPER WELL
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.
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
checked by the installer when con-
verting the furnace for LP operation.
Figures 26 and 27 below show the
incorrect way and the correct way
to install the jumper. The jumper
well is located next to the adjust-
ment well (with "+" and "–" text and
two-headed arrow) and will be cov-
ered by a sticker or label. To con-
vert to LP the label over the jumper
well will need to be removed.
LP JUMPER WELL
(INSERT JUMPER HERE)
ADJUSTMENT WELL
SUPPLY PRESSURE TAP
33