- Shut off power - Shut off gas - Remove inlet gas plug on gas valve, connect manometer, turn on gas, verify 11-13' W.C. - Turn off gas - Remove manometer - Reinstall plug in gas valve
100% firing rate must be calibrated first
- Remove blower door - Remove any existing wires on terminal strip. Install jumper across R and W on terminal strip - Set dip switches a) 10 - off, 11 - on (This will force 100% firing rate) - Connect monometer to manifold side of gas valve test port, set measurement to "W.C. - Turn on gas - Install blower door - Turn on power - Furnace will run in a calibration mode. “CL” will be displayed. Allow furnace to run 5-9 minutes depending on venting. - When "H" is displayed, remove white plastic plug from adjustment well and adjust valve with a thermostat screwdriver. Allow 3 seconds between each click. CCW decrease, CW increase. - Set to 10" W.C.
Repeat the following for 40% firing rate
- Shut off power - Remove blower door - Set dip switches a) 10 - on, 11 - off (This will force 40 % firing rate) - Install blower door - Furnace will run in a calibration mode. “CL” will be displayed. Allow furnace to run 5-9 minutes depending on venting - When "H" is displayed, adjust valve with a thermostat screwdriver. Allow 3 seconds between each click. CCW decrease, CW increase. - Set to 1.6 " W.C.
Calibration complete! - Shut power off - Remove blower door - Remove manometer and install plug in gas valve test port - Install white plug over adjustment well - Install LP sticker on gas valve - Remove jumper from R and W and install thermostat wires - Set dip switches 10 and 11 to off - Reinstall blower door