gized. Power is supplied to the compressor and outdoor fan motor, and the reversing valve switched to the cooling posi- tion. When the fan switch on the thermostat is in the “AUTO” position the indoor blower motor is energized at the cooling airflow.
3.When the demand for cooling has been satisfied, the 24 volt “Y” signal is removed, and the M1 contactor is de- energized. When the fan switch on the thermostat is in the “ON” position, the indoor blower motor continues to run. If the fan switch is in the “AUTO” position. the indoor motor ramps down over a
HEATING OPERATION (B1HH060 with ECM indoor motor)
1.When the fan switch on the thermostat is in the “ON” posi- tion, the 24 volts at “G” brings on the indoor blower motor at the heating flow. When the fan switch on the thermostat is in the “AUTO” position, the blower operates when there is a call for heating by the thermostat.
2.On a call for heating, the thermostat sends 24 volts to “Y” on the fan control board. After the
motor. The reversing valve remains in the heating position. When the fan switch on the thermostat is in the “AUTO” po- sition, the indoor blower is energized at the heating airflow.
3.For units equipped with supplementary electric heat, when the heat pump cannot meet the demand, the thermostat “W” sends 24 volts to “W2” on the fan control board. This signal also is sent through the defrost control terminals “W” and “W6” and back to the fan control “W1”. The 24 volt sig- nal energizes all stages of electric heat.
4When the heating demand is satisfied, the electric heat is
Please refer to Tables 22 and 23 for more information.
SECURE OWNER'S APPROVAL: When the system is
functioning 1/6 properly, secure the owner's approval. Show him the location of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust tem- perature settings within the limitations of the system.
TABLE 22 - THERMOSTAT SIGNALS (SINGLE PHASE UNITS)
SIGNAL | STATE | BOARD FUNCTION | |
|
|
| |
|
|
| |
“G” | ON | FAN INSTANT ON | |
|
| ||
OFF | FAN INSTANT OFF | ||
| |||
|
|
| |
|
| FAN INSTANT ON | |
| ON | COMPRESSOR AND OUTDOOR FAN INSTANT ON (AFTER | |
| REVERSING VALVE ENERGIZED | ||
“G” & “Y” & “O” |
| ||
| SYSTEM OPERATES IN COOLING | ||
|
|
| |
| OFF | COMPRESSOR AND OUTDOOR FAN INSTANT OFF | |
| FAN 60 SEC. DELAY OFF | ||
|
| ||
|
|
| |
|
| FAN INSTANT ON | |
| ON | COMPRESSOR AND OUTDOOR FAN INSTANT ON (AFTER | |
“G” & “Y” |
| SYSTEM OPERATES IN HEATING | |
|
| ||
| OFF | COMPRESSOR AND OUTDOOR FAN INSTANT OFF | |
| FAN 60 SEC. DELAY OFF | ||
|
| ||
|
|
| |
|
| FAN INSTANT ON | |
| ON | HEATER BANK 1 ELEC. HEAT INSTANT ON | |
| HEATER BANK 2 ELEC. HEAT 10 SEC. DELAY ON | ||
|
| ||
“G” & “W” |
| HEATER BANK 3 ELEC. HEAT 20 SEC. DELAY ON | |
|
| ||
| HEATER BANK 3 ELEC. HEAT INSTANT OFF | ||
|
| ||
| OFF | HEATER BANK 2 ELEC. HEAT SEC. DELAY OFF | |
|
| HEATER BANK 1 ELEC. HEAT 1 SEC. DELAY OFF | |
|
| FAN 10 SEC. DELAY OFF | |
|
|
| |
|
| FAN INSTANT ON | |
|
| COMPRESSOR AND OUTDOOR FAN INSTANT ON | |
| ON | SYSTEM OPERATES IN HEATING | |
| HEATER BANK 1 ELEC. HEAT INSTANT ON | ||
|
| ||
|
| HEATER BANK 2 ELEC. HEAT 10 SEC. DELAY ON | |
“G” & “Y” & “W” |
| HEATER BANK 3 ELEC. HEAT 20 SEC. DELAY ON | |
|
| ||
|
| COMPRESSOR AND OUTDOOR FAN INSTANT OFF | |
|
| HEATER BANK 3 ELEC. HEAT INSTANT OFF | |
| OFF | HEATER BANK 2 ELEC. HEAT SEC. DELAY OFF | |
|
| HEATER BANK 1 ELEC. HEAT 1 SEC. DELAY OFF | |
|
| FAN 60 SEC. DELAY OFF | |
|
|
| |
|
| FAN INSTANT ON | |
| ON | HEATER BANK 1 ELEC. HEAT INSTANT ON | |
| HEATER BANK 2 ELEC. HEAT 10 SEC. DELAY ON | ||
|
| ||
“W” |
| HEATER BANK 3 ELEC. HEAT 20 SEC. DELAY ON | |
|
| ||
| HEATER BANK 3 ELEC. HEAT INSTANT OFF | ||
|
| ||
| OFF | HEATER BANK 2 ELEC. HEAT SEC. DELAY OFF | |
|
| HEATER BANK 1 ELEC. HEAT 1 SEC. DELAY OFF | |
|
| FAN 10 SEC. DELAY OFF | |
|
|
|
16 | Unitary Products Group |
