Bard HAC481-BD040 Control Circuit Wiring, Wall Thermostats, Control Diagrams, Combinations

WIRING INSTRUCTIONS

GENERAL

All wiring must be installed in accordance with the National Electrical Code and local codes. In Canada, all wiring must be installed in accordance with the Canadian Electrical Code and in accordance with the regulations of the authorities having jurisdiction. Power supply voltage must conform to the voltage shown on the unit serial plate. A wiring diagram of the unit is attached to the inside of the electrical cover. The power supply shall be sized and fused according to the specification supplied. A ground lug is supplied in the control compartment for equipment ground.

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 motor.

CONTROL CIRCUIT WIRING

For split systems, the minimum control circuit wiring gauge needed to insure proper operation of all controls in both indoor and outdoor units will depend on two factors:

1.The rated VA of the control circuit transformer.

2.The maximum total distance of the control circuit wiring. (This is the distance between the wall thermostat to the indoor unit plus the distance between the indoor unit to the outdoor unit.)

The following table should be used to determine proper gauge of control circuit wiring required.

TABLE 6

CONTROL CIRCUIT WIRING

		Mximum Total
Rated VA of	Transformer	Distance of
Control Circuit	Secondary	Control Circuit
Transformer	FLA @ 24 V	Wiring in Feet
		20 gauge	65
40	1.6	18 gauge	90
		16 gauge	145
		14 gauge	230
		20 gauge	45
		18 gauge	60
50	2.1	16 gauge	100
		14 gauge	160
		12 gauge	250
		20 gauge	40
		18 gauge	55
65	2.7	16 gauge	85
		14 gauge	135
		12 gauge	210

Example: 1. Control circuit transformer rated at 40 VA

2.Maximum total distance of control circuit wiring 85 feet.

From Table 6, minimum of 18 gauge wire should be used in the control circuit wiring.

For control circuit transformers rated other than those listed, use the next lower rated transformer listed.

Example: 1. Control circuit transformer rated at 55 VA

From table use 50VA transformer.

There are two (2) separate control diagrams for fossil fuel furnaces with air conditioners.

Control diagrams for the various circuit which could be encountered with blower coils can be found in the installation instructions of the blower coil.

TABLE 7

CONTROL DIAGRAMS

System	Gas Furnace	Oil Furnace
	Control Diagram	Control Diagram
All Models	4091-100	4091-101

WALL THERMOSTATS

The following wall thermostats and subbases should be used as indicated, depending on the application.

TABLE 8

WALL THERMOSTAT and SUBBASE

COMBINATIONS

Thermostat	Subbase	Predominate Features
8403-002	8404-003	1 stage heat, 1 stage cool;			Mercury
T87F311	Q529A1220	System: heat-off-cool		Fan: on-auto
8403-041	- - -	1 stage heat,	1 stage cool;		Mercury
T8034-C		System: heat-off-cool		Fan: on-auto
8403-035		2 stage heat, 2 stage cool
	- - -	Programmable
1F95-80
		Electronic
8403-042		2 stage heat,	1 stage cool
	- - -	System: heat-off-auto-cool
T8511G
		Fan: on-auto	Electronic
8403-043		1 stage heat,	1 stage cool
	- - -	System: heat-off-cool		Fan: on-auto
CM200
		Snap Action
8403-027		3 stage heat,	2 stage cool
	- - -	Programmable
1F92-71
		Electronic

Manual 2100-346 Page 9