THERMOSTAT INDICATOR LAMPS
The red lamp marked “EM. HT.” comes on and stays on whenever the system switch is placed in Em. Ht. position. The green lamp marked “Check” will come on if there is any problem that prevents the compressor from running when it is supposed to be.
EMERGENCY HEAT POSITION
The operator of the equipment must manually place the system switch in this position. This is done when there is a known problem with the outdoor section, or when the green “Check” lamp comes on indicating a problem.
TRANSFORMER TAPS
230/208V, 1 phase and 3 phase equipment employ dual primary voltage transformers. All equipment leaves the factory wired on 240V tap. For 208V operation, reconnect from 240V to 208V tap. The acceptable operating voltage range for the 240 and 208V taps are:
TAP | RANGE |
240 | 253 – 216 |
208 | 220 – 187 |
NOTE: The voltage should be measured at the field power connection point in the unit and while the unit is operating at full load (maximum amperage operating condition).
COMPRESSOR CUTOFF THERMOSTAT WIRING (5 and 10 KW)
FIGURE 9
UNIT 24V TERMINAL BOARD
REMOVE FACTORY
JUMPER
OUTDOOR THERMOSTAT | |
| |
| USED AS COMPRESSOR CUTOFF |
TABLE 8
5 and 10 KW
Model | KW | Volts | Phase |
|
|
|
|
PH1224 | 0, 5, 10 | 230 | 1 |
|
|
|
|
PH1230 | 0, 5, 10 | 230 | 1 |
|
|
|
|
PH1236 | 0, 5, 10 | 230 | 1 |
|
|
|
|
COMPRESSOR CUTOFF THERMOSTAT and OUTDOOR THERMOSTAT WIRING
Heat pump compressor operation at outdoor temperatures below 0° F are neither desirable nor advantageous in terms of efficiency. Since most equipment at time of manufacture is not designated for any specific destination of the county and most of the equipment is installed in areas not approaching the lower outdoor temperature range, the compressor cutoffs are not factory installed.
Outdoor thermostats are available to hold off various banks of electric heat until needed as determined by outdoor temperature. The set point of either type of thermostat is variable with geographic region and sizing of the heating equipment to the structure. Utilization of the Heating Application Data and the heat loss calculation of the building are useful in determining the correct set points.
COMPRESSOR CUTOFF THERMOSTAT WIRING (15 KW ONLY)
FIGURE 10
UNIT 24V TERMINAL BOARD
REMOVE FACTORY
JUMPER
OUTDOOR THERMOSTAT | |
| |
| USED AS COMPRESSOR CUTOFF |
TABLE 9
15 KW ONLY
Model | KW | Volts | Phase |
|
|
|
|
PH1230 | 15 | 230 | 1 |
|
|
|
|
PH1236 | 15 | 230 | 1 |
|
|
|
|
Manual
