Nature Air RGRM-04*MAES Installation Instructions Manual - page 39
9.
Turn on the gas supply and check
unit thoroughly for gas leaks using
soap solution.
10. Follow lighting instructions to put
furnace into operation.
11. Operate thermostat to check unit
operation.
DO NOT USE AN OPEN FLAME.
NOTE: If you have a single
thermostat, the furnace will start
on high fire then switches to low
fire and will continue on low fire for
12 minutes and then if thermostat
is not satisfied, shifts to high fire.
With a 2-stage thermostat, when
there is a call for low heat (1st
stage), the furnace will start on
high fire then switch to low fire
until the call for heat is satisfied or
2nd stage contacts close.
TO CONVERT GAS VALVE
TO LP GAS AND
CHECK/ADJUST GAS
PRESSURE
1. See Honeywell envelope kit
#396021 for proper LP regulator
spring and instructions. (See
Figures 38 & 39.)
2. The LP gas supply pressure must
be set between 11 and 13” W.C. by
means of the tank or branch supply
regulators.
39
LP CONVERSION
The valve can be converted to use
liquified 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.
See Figure 37.
NOTE:
Order the correct LP conversion
kit from the furnace manufacturer. Refer
to the latest “L.P. Conversion Kit Index”
shipped with the furnace or see
Rheemote.net and PTS for latest
version. Furnace conversion to LP gas
must be performed by a qualified
installer, service agency or the gas
supplier.
ORIFICE INSTALLATION
LP Gas is a manufactured gas that has
consistent heating value across most
regions.
The Sea Level input should still be
reduced by 3.5-4% per thousand ft. and
the orifice size must be selected based
on the reduced input selection chart
below.
TO CHANGE BURNER
ORIFICE
1.
TURN OFF ELECTRICAL
POWER AND MAIN GAS
SUPPLY BEFORE BEGINNING
MODIFICATION. FAILURE TO
DO SO CAN RESULT IN
ELECTRICAL SHOCK OR
EXPLOSION CAUSING
PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
2.
Disconnect union ahead of
combination gas valve.
3.
Disconnect leads from gas valve.
4.
Remove the 4 screws holding the
manifold assembly to the main
burner assembly.
5.
Replace the L.P. stem/spring
assembly from kit as shown in
Figures 38 and 39.
6.
Remove each existing orifice from
the manifold assembly using a
ratchet with a 7/16 socket. Replace
with orifices from the kit. Screw the
orifices in hand tight and secure in
place with a quarter turn with the
ratchet.
7.
Reinstall the manifold assembly on
the burner assembly with the 4
screws removed in step 4.
8.
Reconnect the leads to the gas
valve, union, and electrical power
to furnace.
FIGURE 37
TYPICAL LP KIT CONTENTS
Altitude
Orifice Size
0 to 5000
ⴕ
1.15 mm
5000
ⴕ-8000ⴕ
1.10 mm
WARNING
!
WARNING
!
3. The furnace manifold pressure
should be 10” W.C. for high fire
and 4.8” W.C. for low fire. These
pressures can be checked by
connecting a properly calibrated
manometer or gauge to the
manifold pressure tap on the
outlet end of the valve. Check and
adjust pressures as follows:
a. For full input pressure remove
adjustment screw cover on
outlet end of valve and turn
adjustment screw clockwise to
increase pressure and
counterclockwise to reduce
pressure. Replace the
adjustment cover screw
securely.
b. For low fire pressure, remove
the regulator cover on top of
valve and adjust as noted
above.
NOTE:
Use 3/32” allen wrench
for making pressure
adjustments. See Figures 38 &
39.
COMPLETING
CONVERSION
1. Using a ball point indelible pen,
record the following information on
the conversion label.
a. Conversion kit number.
b. Date of conversion.
c. Installer’s name, address and
telephone number.
d. Burner orifice size.