Bard W**H*D, S**H*D, T**H*D installation instructions Wiring LOW Voltage Wiring

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TABLE 1

DIAGRAM TO USE WITH UNIT AND VENTS

 

Vent

 

None

CRV, ERV, MFAD

CRVMWH-3

 

EIFM

ECONWM*

 

 

 

CHCRV-5

Economizer

CS2000A*

 

 

 

 

 

 

 

 

 

System

Vent Code

 

X

R, M, V, P

 

C

 

E

T, W, S

 

 

Thermostat

Programmable

Programmable

Programmable

Programmable

Programmable

All

 

Model Series

No

 

Yes

No

Yes

No

 

Yes

No

 

Yes

No

Yes

 

 

S**H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heat Pump

T**H

1

 

1

3 & 4

2

15

 

14

N/A

 

5

N/A

13

11

 

W**H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heat Pump with

S**H*D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T**H*D

7

 

6

9 & 10

8

N/A

 

14

N/A

 

12

N/A

13

N/A

Dehumidification

 

 

 

W**H*D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WIRING – LOW VOLTAGE WIRING

230/208V, 1 phase and 3 phase equipment 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 240V and 208V taps are:

TABLE 2

OPERATING VOLTAGE RANGE

TAP

RANGE

240V

253 – 216

208V

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).

An 18 gauge copper, color-coded thermostat cable is recommended. The connection points are shown in this Manual. See Table above.

Low Voltage Connection

These units use a grounded 24-volt AC low voltage circuit.

The “R” terminal is the hot terminal and the “C” terminal is grounded.

G” terminal is the fan input.

Y” terminal is the compressor input.

B” terminal is the reversing valve input. The reversing valve must be energized for heating mode.

R” terminal is the 24 VAC hot.

C” terminal is the 24 VAC grounded.

L” terminal is compressor lockout output. This terminal is activated on a high or low pressure trip by the electronic heat pump control. This is a 24 VAC output.

W2” terminal is second stage heat (if equipped).

O1” terminal is the ventilation input. This terminal energizes any factory installed ventilation option.

E” terminal is the emergency heat input. This terminal energizes the emergency heat relay.

W3” terminal is the dehumidification input. This terminal energizes compressor, blower and three-way valve.

LOW VOLTAGE CONNECTIONS

FOR DDC CONTROL

Fan Only

 

Energize G

Cooling Mode

Energize Y, G

Heat Pump Heating

Energize Y, G, B

2nd Stage Heating

Energize G, W2, Y, B

w/Heat Pump (if employed)

Ventilation

 

Energize G, O1

Emergency Heat

Energize B, W2, E, G

Dehumidification

Energize W3

 

 

 

 

 

TABLE 3

 

 

WALL THERMOSTAT

 

 

 

 

Part Number

 

 

Predominate Features

 

 

2 stage Cool, 2 stage Heat - Conventional

8403-058

 

1 stage Cool, 2 stage Heat - Heat Pump

(TH5220D1151)

Electronic Non-Programmable

 

 

Auto or Manual changeover

 

 

3 stage Cool; 3 stage Heat

8403-060

 

Programmable/Non-Programmable Electronic

 

HP or Conventional

(1120-445)

 

 

Auto or Manual changeover

 

 

 

 

Dehumidification Output

 

 

 

 

Manual

2100-516H

 

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Contents Single Stage Heat Pumps LOW Voltage Control Circuit Wiring Contents Wiring LOW Voltage Wiring Thermostat Wire Size Low Voltage Wiring Diagram Low Voltage Wiring Diagram Stage Cool Only if optional CO2 controller is used Low Voltage Wiring Diagram Electronic Programmable Stage Cool Stage Heat Cool CRV Stage Cool 2 Stage Heat WH/SH Heat Pump Connection Diagram WH Unit Low Voltage Term. Strip Thermostat 24V Low Voltage Terminal Block Yellow Black Red Stage Cool Stage Heat Unit