Bard PH1224 Wiring - Main Power, WIRING - 24V LOW VOLTAGE CONTROL CIRCUIT, Low Voltage Wiring

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 Data” on pages 2.) 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 on page 2 lists 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

Ten (10 ) wires should be run from thermostat subbase to the 24V terminal board in the unit. A ten conductor,

18 gauge copper, color-coded thermostat cable is recommended. The connection points are shown in Figure 8.

FIGURE 8 – LOW VOLTAGE WIRING

			MIS-1187
TABLE 6 – THERMOSTAT WIRE SIZE
Transformer	FLA	Wire	Maximum Length
VA		Gauge	In Feet
55	2.3	20	45
		18	60
		16	100
		14	160
		12	250

Manual 2100-344 Page 9