SPECIFICATIONS |
Detailed Sequence - HWC123, 183, 243, 303
Refer to Figure
POWER
Line Voltage
With the unit at rest (no call from the thermostat), line voltage will be present:
L1 Power
1.Through the L1 black lead to the L1 terminal on the ignition control
2.At the L1 contactor terminal
3.At the transformer terminal marked
L2 Power
1.Through the L2 black lead to the induced draft blower
2.At the L2 contactor terminal
3.A transformer common terminal
4.At the T2 contactor terminal
5.At the R terminal of the compressor
6.At the capacitor common terminals
Low Voltage (24 VAC)
With the unit at rest (no call from the thermostat), 24 volts A/C will be present:
1.From the transformer 24V terminal to pin 4 of the
2.From pin 4 of the chassis low voltage harness to the
24VAC hot terminal on the ignition control
3.From the 24VAC hot terminal to pin 5 of the
4.From the 24VAC hot terminal also to pin 6 of the 6- pin ignition wire harness
5.From pin 6 of the ignition wire harness through the auto reset limit switch and the manual reset rollout switch to pin 1 of the
Note: While the unit is at rest, the green LED shows consistent slow flash. This indicates normal operation - system at rest (standby mode).
CALL FOR HEAT
Line Voltage
The ignition control receives a signal from the
1.The combustion blower relay energizes, sending L1 power to CMB BLWR terminal on the ignition
control. This causes the combustion blower to start by completing the line voltage circuit through the L2 wire connection in the unit.
2.As the
ACB HEAT terminal on the ignition control.
3.L1 power is then sent to the circulating air blower terminal block where it is connected to the blower motor. The circulating air blower starts by completing the
4.The combustion blower and the circulating air blower continue to run until the
CMB BLWR terminal on the ignition control de- energizes. This interrupts L1 power to the combus- tion blower. After a
Low Voltage
1.A call for heat closes the
2.The
3.The
4.The
5.When the
6.After the
7.When the
8.The
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