Propane Conversion Kit Instructions

5
HONEYWELL VR8215
CONVERSION INSTRUCTIONS
NOTE: For low NOx models, see page 6 for NOx screens.
1. Turn off gas supply to the furnace.
2. Turn off the electrical power to the furnace.
3. Remove the furnace control access panel.
4. Separate the gas supply union and remove associated down-
stream piping.
NOTE: Always use a backup wrench when removing or
replacing piping to avoid any undue strains or rotation of
controls.
FLOW
DIRECTION
Gas Valve
ON/OFF Selector
Outlet Pressure
Tap 1/8 NPT 3/16
Inlet Pressure Tap
1/8 NPT 3/16 Allen
Regulator Pressure
A
djustment (Under Cap
Screw), Turn Clockwise to
Increase Pressure, Turn
Honeywell VR8215
5. Remove the wires from the gas valve.
6. Remove the 4 sheet metal screws that fasten the manifold/
gas valve assembly to the burner box.
7. Visually inspect orifices for damage and drill size (marked
on face with a 55) before installation. Using the 7/16"
wrench, remove all existing natural gas orifices and replace
with the appropriate marked 55 L.P. gas orifices contained
in this kit. Tighten the orifices to prevent gas leaks, but do
not overtighten. Retain the natural gas orifices for future
reconversion.
8. Reinstall the manifold/gas valve assembly into the appli-
ance. Rewire the gas valve.
9. Remove both the inlet and outlet plugs on the gas valve,
using the 3/16” Allen wrench. Install the fittings which ac-
company the manometers into the 1/8” taped holes of the
gas valve. Connect the manometers to the barbed fittings.
10. Using a flat blade screwdriver, remove the regulator cover
screw.
11. Using a flat blade screwdriver, remove plastic regulator ad-
justment screw located beneath the cover screw.
12. Remove the natural gas regulator spring from the regulator
sleeve.
13. Insert the kit (P/N 0163M00078, Honeywell P/N 396221)
provided L.P. regulator spring into the regulator sleeve.
14. Replace the regulator adjustment screw and adjust it clock-
wise to bottom stop. Follow instructions below beginning
in step 21 for checking & adjustment to verify manifold
pressure falls into the desired range.
15. Apply a liberal amount of pope joint compound or pipe
thread tape to the threads and reassemble the piping previ-
ously removed.
NOTE: the pipe joint compound or pipe thread tape must
be resistant to L.P. gas.
16. Turn on the gas supply and check for leaks.
17. Turn on the electrical supply.
18. Adjust the room thermostat to allow for constant operation.
19. To check for air trapped in the supply line: Verify line
pressure is in the correct range. If manifold pressure is
indicated during the ignition trial, the valve is opening and
air may be in the line.
Units with hot surface ignitors: The valve will not open
until the ignitor is at the proper temperature (glowing
brightly).
Units with spark ignition: The valve will open as soon as
the spark starts. If no manifold pressure is indicated dur-
ing the trial for ignition, please return to step 13 to ensure
the correct spring was used and to ensure the regulator
adjustment is near the bottom of the adjustment range.
20. If gas inlet pressure falls outside the range of 11” and 13”
W.C. after the unit has been in operation for 15 minutes,
adjust the gas supply pressure (not manifold pressure),
check piping size, etc., and/or consult with local utility.
NOTE: Any other gas-fired equipment should be ON before
any adjustments are made.
21. Check manifold pressure. For propane gas, the manifold
pressure must be between 9.7” and 10.3” W.C.
22. Turn adjustment screw out (counterclockwise) to decrease
pressure, turn in (clockwise) to increase pressure. Only
small variations in gas flow should be made by means of
the pressure regulator adjustment. In no case should the
final manifold pressure vary more than plus or minus 0.3”
water column from the specified nominal pressure. Any
major changes in flow should be made by changing the
size of the burner orifices. The measured input rate to the
furnace must not exceed the rating specified on the unit
rating plate.