START-UP
For Your Safety Read Before Lighting
CAUTION
Furnace is equipped with a direct ignition control. Do not attempt to manually light the burners.
Pre-Start Check List
Complete the following checks before starting the unit:
1.Check the type of gas being supplied. Be sure it is the same as listed on the unit nameplate.
2.Make sure that the vent hood has been properly installed.
To Light Burners:
1.Turn off electrical power to unit.
2.Turn the thermostat to lowest setting.
3.Turn the gas control knob, or slide the gas control switch, to the “ON” position (see Figure 9).
4.Turn on electrical power to the unit.
5.Set the room thermostat to the desired temperature. (If the thermostat “set” temperature is above room temperature, the burners will light after the
To Shut Down Burners:
1.Turn off electrical power to unit.
2.Turn the gas control knob, or slide the gas control switch, to the “OFF” position (see Figure 9).
Post-Start Check List
After the entire control circuit has been energized and the heating section is operating, make the following checks:
1.Check for gas leaks, using soapy solution, in the unit piping as well as the supply piping.
2.Check for correct manifold gas pressures (see following Checking and Adjusting Gas Input section).
3.Check the supply gas pressure. It must be within the limits shown on the rating plate. Supply pressure should be checked with all gas appliances in the building at full fire. At no time should the supply pressure during standby exceed 13" w.c., nor should it be less than 5" w.c. for
Gas Valves
Regulator Gas
Adjustment Control
Cap Knob
Inlet Pressure Tap | Outlet Pressure Tap | |
1/8" NPT |
| (Manifold Pressure) |
|
| 1/8" NPT |
Regulator | Gas Control Switch | |
Adjustment | ||
Cap |
|
|
Inlet Pressure Tap | Outlet Pressure Tap | |
1/8" NPT |
| (Manifold Pressure) |
|
| 1/8" NPT |
Figure 9
natural gas or 11" W.C. for propane gas with the burners in operation. If gas pressure is outside these limits, contact the gas supplier for corrective action.
4.Adjust temperature rise to be within the range specified on the rating plate.
Checking and Adjusting Gas Input
For purpose of input adjustment, the minimum permissible gas supply pressure is 5" w.c. for natural gas and 11" w.c. for propane.
Gas input must never exceed the input capacity shown on the rating plate. The furnace is equipped for natural gas rated inputs with manifold pressure of 3.5" w.c.
The manifold pressure can be measured by shutting off the gas, removing the pipe plug in the downstream side of the gas valve, and connecting a water manometer or gauge. To adjust the regulator, turn the adjusting screw on the regulator clockwise to increase pressure and input or counterclockwise to decrease pressure and input. The final manifold pressure should not vary more than 0.3" w.c. from the above specified pressure. See Figure 9 to assist in locating the regulator on the gas valve.
Page 10 | Issue 1008 |
