WIRING – MAIN POWER
Refer to the unit rating plate for wire sizing information and maximum fuse size. Each outdoor unit is marked with a “Minimum Circuit Ampacity”. This means that the field wiring used must be sized to carry that amount of current. If field installed heaters are added to the basic unit, a second separate power supply circuit will be required. The heater rating plate located adjacent to the basic unit rating plate will show the appropriate circuit ampacity fuse size, etc. (Also see “Electrical Specifications” on pages 5 & 7.) All models are suitable for connection with copper wire only. These instructions must be adhered to. Refer to the National Electrical Code for complete current carrying capacity data on the various insulation grades of wiring material.
The electrical specifications list fuse and wire sizes (75°F copper) for all models including the most commonly used heater sizes.
The unit rating plate lists a “Maximum Time Delay Fuse” or “HACR” type circuit breaker that is to be used with the equipment. The correct size must be used for proper circuit protection and also to assure that there will be no nuisance tripping due to the momentary high starting current of the compressor.
WIRING – 24V LOW VOLTAGE CONTROL CIRCUIT
Five (5) wires should be run from thermostat subbase to the 24V terminal board in the unit. A five conductor, 18 gauge copper,
TABLE 6
THERMOSTAT WIRE SIZE
|
|
| Maximum |
|
|
| Distance |
Transformer VA | FLA | Wire Gauge | In Feet |
|
|
|
|
|
| 20 | 45 |
|
| 18 | 60 |
55 | 2.3 | 16 | 100 |
|
| 14 | 160 |
|
| 12 | 250 |
|
|
|
|
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).
THERMOSTATS
See specific wiring information for the different models, heater KWs, and voltages on unit and heating wiring diagrams.
| TABLE 7 | |
| WALL THERMOSTATS | |
|
| |
Thermostat | Predominant Features | |
|
| |
1 stage Cool; 1 stage Heat | ||
(TH3110D1040) | ||
Electronic | ||
|
| |
2 stage Cool; 2 stage Heat | ||
Electronic | ||
(TH5220D1151) | ||
| Auto or Manual changeover | |
| 3 stage Cool; 3 stage Heat | |
HP or Conventional | ||
| Auto or Manual changeover | |
|
|
IMPORTANT NOTE: Only the thermostats as shown above will work with this equipment. The thermostats and correct operation can be assured only by proper selection and application of these parts.
Manual | |
Page | 13 of 25 |