GAS HEAT ANTICIPATOR SETPOINTS
It is important that the anticipator setpoint be correct. Too high of a setting will result in longer heat cycles and a greater temperature swing in the conditioned space. Reducing the value below the correct setpoint will give shorter “ON cycles and may result in the lowering of the temperature within the conditioned space. Refer to Table 25 for the required gas heat anticipator setting.
TABLE 25: GAS HEAT ANTICIPATOR SETPOINTS
| SETTING, AMPS | |
|
|
|
W1 |
| W2 |
|
|
|
0.65 |
| 0.1 |
|
|
|
HEATEXCHANGERTUBE
GAS |
|
| |
SUPPLY |
| BURNERFLAME | |
PIPE | BURNER | ||
(BLUEONLY) | |||
|
|
BURNERBRACKET
IGNITOR
FIGURE 26 - TYPICAL FLAME
START-UP (COOLING)
OPERATING INSTRUCTIONS
1.Turn unit electrical power on.
NOTE: Prior to each cooling season, the crankcase heaters must be energized at least 10 hours before the sys- tem is put into operation.
2.Set the room thermostat setting to lower than the room temperature.
3.First stage compressors will energize after the
4.The second stage of the thermostat will energize second stage compressor if needed.
POST START CHECK LIST
1.Verify proper system pressures for both circuits.
2.Measure the temperature drop across the evaporator coil.
START-UP (GAS HEAT)
PRE-START CHECK LIST
Complete the following checks before starting the unit.
1.Check the type of gas being supplied. Be sure that it is the same as listed on the unit nameplate.
2.Make sure that the vent outlet and combustion air inlet are free of any debris or obstruction.
PRESTART CHECK LIST
After installation has been completed:
1.Check the electrical supply voltage being supplied. Be sure that it is the same as listed on the unit nameplate.
2.Set the room thermostat to the off position.
3.Turn unit electrical power on.
4.Set the room thermostat fan switch to on.
5.Check indoor blower rotation.
•If blower rotation is in the wrong direction. Refer to Phasing Section in general information section.
•Check blower drive belt tension.
6.Check the unit supply air (CFM).
7.Measure evaporator fan motor's amp draw.
8.Set the room thermostat fan switch to off.
9.Turn unit electrical power off.
OPERATING INSTRUCTIONS
This furnace is equipped with an intermittent pilot and automatic
LIGHTING THE MAIN BURNERS
1.Turn “OFF” electric power to unit.
2.Turn room thermostat to lowest setting.
3.Turn gas valve
4.Turn “ON” electric power to unit.
5.If thermostat set temperature is above room tempera- ture, the main burners will ignite. If a second stage of heat is called for, the main burners for second stage heat will ignite for the second stage heat.
Unitary Products Group | 39 |
