Installation Instructions

2
TO CONVERT FROM NATURAL TO L.P. GAS
1. Shut OFF gas supply at manual shutoff and turn OFF power to the furnace.
2. Remove access door.
3. Disconnect wiring from the gas valve.
4. Remove the gas manifold assembly by removing the four screws connecting it to the burner bracket.
See Figure 2 below.
Figure 2 - Gas Manifold Removal
5. Remove natural gas orifices from gas manifold using 7/16" box end wrench.
6. Visually inspect L.P. gas orifices (B40899125) for damage and drill size (marked on face with #125) before installation. Install
orifices and tighten with a box-end wrench, take care to avoid crossthreading or over tightening.
7. Remove the “NAT. GAS” label from the top of the 36J27 gas valve.
8. Use needle nose pliers to place the jumper (see enclosed F92-1021 kit) on the receptacle. Make sure both pins engage the jumper
9. Place the “L.P.” label (see the enclosed F92-1021 kit) on the gas valve, covering the jumper installed in step 8.
10. Attach the “WARNING” label (see the enclosed F92-1021 kit) to the gas valve where it can readily be seen.
11. Attach the gas manifold assembly to the burner bracket using the four screws removed in step 4.
L.P. GAS PRESSURE CHECK
L.P. Gas Supply Pressure must be verified with all L.P. appliances in operating mode. See Table 1 for the required L.P. gas pressure.
1. Turn OFF electrical power & gas supply to the unit.
2. Use a 3/16" Allen wrench to remove the 1/8" NPT inlet pressure tap from the gas valve.
3. Connect a calibrated water manometer or appropriate gas pressure gauge at the gas valve inlet pressure tap.
4. Turn ON the power and gas, put the unit into heating cycle on high fire (100%). The pressure tap must be leak checked after
resealing.
Minimum: 11" w.c. Maximum: 13" w.c.
Propane Gas Supply Pressure Range
Table 1
4 Screws
Manifold
Gas Valve