POWER WIRING
FIG. 5 - TYPICAL FIELD WIRING
insulated wires 1.0mm2 (#18 AWG) should be used to connect thermostat to unit. Eight conductors are required.
The subbase on the low voltage thermostat includes an “Emergency Heat ” position on the system switch and a pilot light. In the “Emergency Heat” position, the thermostat provides electric resistance heat only. The compressors will not run. The pilot light indicates that the switch is on “EM HT”. Nine conductors are required for this application.
POWER AND CONTROL WIRING
Field wiring to the unit and electrical grounding of the unit must conform to the applicable national, and local or municipal codes. Voltage tolerances which must be maintained at the compressor terminals during starting and running conditions are indicated on the unit Rating Plate and Table 1.
The internal wiring harness furnished in this unit is an integral part of the unit. Field alteration to comply with electrical codes should not be required.
A fused disconnect switch should be field provided for the unit. The switch must be separate from all other circuits. Refer to Figure 7 for installation location. If any of the wire supplied with the unit must be replaced, replacement wire must be of the type shown on the wiring diagram. Refer to Table 7 for electrical data.
Electrical line must be sized correctly to carry the load. USE COPPER CONDUCTORS ONLY. Each unit must be wired with a separate branch circuit fed directly from the meter panel and properly fused.
CAUTION: When connecting electrical power and control wir- ing to the unit, waterproof type connectors MUST
BE USED so that water or moisture cannot be drawn into the unit during normal operation. The above waterproofing conditions will also apply when installing a
Refer to Figure 5 for typical field wiring and to the appropriate unit wiring diagram for control circuit and power wiring information.
OPTIONAL ELECTRIC HEATERS
The factory installed heaters are wired for single point power supply. Power supply need only be brought into the single point terminal block and thermostat wiring to the low voltage terminal strip located in the upper portion of the unit control box.
TABLE 2 - ELECTRIC HEAT APPLICATION DATA
| Minimum | Output by Operation Mode and | ||||
|
| Heat Stage |
| |||
Heater | Airflow |
|
| |||
| kW @ 400/415V* |
| ||||
Model | m3/s (CFM) |
|
| |||
Normal Operation | Emergency Heat | |||||
|
| |||||
| 180 | W1 | W2 | W1 | W2 | |
E018 | 2.12 | Mechanical | 11.3/13.5 | 11.3/13.5 | None | |
(4500) | ||||||
|
|
|
|
| ||
E036 | 2.12 | Mechanical | 11.3/13.5 | 11.3/13.5 | 11.3/13.5 | |
(4500) | ||||||
|
|
|
|
| ||
E054 | 2.36 | Mechanical | 11.3/13.5 | 11.3/13.5 | 22.6/26.9 | |
(5000) | ||||||
|
|
|
|
| ||
E072 | 2.36 | Mechanical | 22.6/26.9 | 22.6/26.9 | 22.6/26.9 | |
(5000) | ||||||
|
|
|
|
| ||
*Refer to Table 8 for total heater output kW for the respective heater.
Unitary Products Group | 5 |
