Bard CH4S1, CH5S1, CH3S1 Wiring Main Power, TAP Range, Thermostat Wire Size

FIGURE 10

COMMON WALL MOUNTING INSTALLATIONS

Closet Installation

Note: duct maybe in attic or below rafters as shown.

WIRING – LOW VOLTAGE WIRING

230 / 208V, 1 phase and 3 phase equipment have 24V transformers with dual primary voltage. All equipment leaves the factory wired on 240V tap. For 208V operation, reconnect from 240V to 208V tap. The

Unit (outside)

Rafters

acceptable operating voltage range for the 240 and 208V taps are:

		Supply Air	Duct
		Finished Ceiling	Grille
		Wall Sleeve
Outside Wall	Return Air	Closet Wall	Closet Wall
		Raised Closet Floor	Grille
		Return Air

TAP	RANGE
240	253 – 216
208	220 – 187

NOTE: 460V units require no action. 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).

FIGURE 11

UNIT 24V ThERMOstat connections

OPTIONAL	THERMOSTAT BARD PART
	#8403-052, 8403-053, 8403-055
8403-061
OUTDOOR

WIRING – MAIN POWER

MIS-2240

SENSOR C G Rc Rh Y1 Y2 B W1 AUX

Refer to the unit rating plate for wire sizing information and maximum fuse or “HACR” type circuit breaker 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. Depending on the installed KW of electric heat, there may be two field power circuits required. If this is the case, the unit serial plate will so indicate. All models are suitable only for connection with copper wire. Each unit and/or wiring diagram will be marked “Use Copper Conductors Only”. These instructions must be adhered to. Refer to the National Electrical Code (NEC) for complete current carrying capacity data on the various insulation grades of wiring material. All wiring must conform to NEC and all local codes.

The electrical data lists fuse and wire sizes (75°C copper) for all models including the most commonly used heater sizes. Also shown are the number of field power circuits required for the various models with heaters.

The unit rating plate lists a “Maximum Time Delay Relay 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 motor.

The disconnect access door on this unit may be locked to prevent unauthorized access to the disconnect. To convert for the locking capability, bend the tab located in the bottom left hand corner of the disconnect opening under the disconnect access panel straight out. This tab will now line up with the slot in the door. When shut, a padlock may be placed through the hole in the tab preventing entry.

See “Start Up” section for important information on three phase scroll compressor start ups.

GND OD								THERMOSTAT
								BARD PART #8403-060
GND ID	C	G	R	Y1	Y2	O/B	W2	W1/E	L	D/YO	A
											1
OPTIONAL	C	G	R	Y	Y1	B	W1 W2	W3 E	L	DH	O1
8403-062
INDOOR								UNIT LOW VOLTAGE
SENSOR			Factory Jumper					TERMINAL BLOCK

MIS-2026 C

Only needed if dehumidification is used.

Eleven (11) wires should be run from thermostat subbase to the 24V terminal board in the unit. An eleven conductor, 18 gauge copper color-coded thermostat cable is recommended. The connection points are shown in Figure 11. An additional wire is needed if dehumidification is used.

IMPORTANT

Only the thermostat combinations as shown above will work with this equipment.

Table 3

THERMOSTAT WIRE SIZE

Transformer			Maximum
	FLA	Wire Gauge	Distance
VA
			In Feet
		20 gauge	45
		18 gauge	60
65	2.3	16 gauge	100
		14 gauge	160
		12 gauge	250

Manual 2100-455M

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