Bard Two Stage Heat Pumps Low Voltage Control Circuit Wiring Installation Guide

INSTALLATION INSTRUCTIONS
TWO-STAGE HEAT PUMPS
LOW VOLTAGE
CONTROL CIRCUIT WIRING
Models:
TS T*SD CH

INSTALLATION

TABLE 1
Diagram to Use With Unit and Vents

Model Series| No Vents| ERV MFAD
CRV| CRVMWH-3
CHCRV-5| Economizer “E” Vent Option| T, W, S ECONOMY
---|---|---|---|---|---
Vent Code| X| R, M, V, P| C| E| T, W, S
TS / CH| 1| 2| 9 & 10| 3| 7
T*SD| 4| 5| 9 & 10| 6| 8

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

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 Table 2.
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 Stage 1.
“B” terminal is the reversing valve input. The reversing valve must be energized for heating mode.
“R” terminal is the 24 VAC hot.
“RT” terminal is the 24 VAC hot from the transformer (used with “R” for fire/smoke shutdown).
“C” terminal is the 24 VAC grounded.
“Y1” terminal is the compressor input Stage 2.
“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 the compressor, blower, and threeway valve. This applies only to models equipped for dehumidification
sequence.

LOW VOLTAGE CONNECTIONS FOR DDC CONTROL

FOR DDC CONTROL
Fan Only
Cooling Mode 1st Stage
Cooling Mode 2 nd Stage
Heat Pump Heating 1 st Stage
Heat Pump Heating 2 nd Stage
3 rd Stage Heating
w/Heat Pump (if employed)
Ventilation
Emergency Heat
Dehumidification| Energize G
Energize Y, G
Energize Y, Y1, G
Energize Y, G, B
Energize Y, Y1, B, G
Energize G, W2, Y, B, Y1
Energize G, O1
Energize B, W2, E, G
Energize W3
---|---

TABLE 3
Wall Thermostat

8403-060
(1120-445)| 3 stage Cool; 3 stage Heat
Programmable/Non-Programmable Electronic
HP or Conventional
Auto or Manual changeover
Dehumidification Output

TABLE 4
Humidity Controls

8403-038
(H600A1014)| SPDT switching, pilot duty 50VA @ 24V
Humidity range 20-80% RH
8403-047
(H200-10-21-10)| Electronic dehumi distat SPST closes-on-rise
Humidity range 10-90% with adjustable stops

TABLE 5
CO2 controller

sensor. Default  setting 950ppm, adjustable to 0-2000ppm
Default off setting 1000ppm, adjustable to 0-200 ppm can be calibrated

TABLE 6
Thermostat Wire Size

Transformer
VA| FLA| Wire Gauge| Maximum
Distance
In Feet
---|---|---|---
55| 2.3| 20 gauge
18 gauge
16 gauge
14 gauge
12 gauge| 45
60
100
160
250

FIGURE 1

Low Voltage Wiring Diagram:
Heat Pump With Optional Electric Heat
No Economizer or Ventilation Packages

1. Factory-installed jumper (on applicable models).
   Remove jumper and connect to N.C fire alarm circuit if emergency shutdown required.

FIGURE 2

Low Voltage Wiring Diagram:
Heat Pump With Optional MFAD, CRV & ERV
Ventilation Packaging With Programmable Thermostat

1. Factory Jumper Installed

2. Do not connect “A” from tstat #8403-060
   if an optional CO controller is used.

3. Factory-installed jumper (on applicable models).
   Remove jumper and connect to N.C fire alarm
   circuit if the emergency shutdown is required.

FIGURE 3

Low Voltage Wiring Diagram:
Heat Pump With Optional Economizer

1. Factory-installed jumper (on applicable models).

2. Remove jumper and connect to N.C fire alarm circuit if the emergency shutdown is required.
   Factory Jumper Installed.

3. Must be configured for economizer with YO/D output to be active as first stage cooling.

4. These wires are used in special control applications only.

FIGURE 4

Low Voltage Wiring Diagram:
Heat Pump With Dehumidification Sequence and No Ventilation Package
Using Thermostat #8403-060 Combination Temperature & Humidity Controller

1. Must be configured for “no economizer” to make YO/D output active for humidity control.
2. Factory-installed jumper (on applicable models).
   Remove jumper and connect to N.C fire alarm
   circuit if emergency shutdown required.

FIGURE 5

Low Voltage Wiring Diagram:
Heat Pump With Dehumidification Sequence & Optional MFAD, CRV & ERV Ventilation
Packaging Using Electronic Thermostat With Combination Temperature & Humidity Control
Packaging using Electronic Thermostat with Combination Temperature and Humidity Control with Optional CO2 Controller

1. Factory Jumper Installed
2. Must be configured for “no economizer” to make YO/D output active for humidity control.
3. Factory-installed jumper (on applicable models).
   Remove jumper and connect to N.C fire alarm circuit if the emergency shutdown is required.

FIGURE 6

Low Voltage Wiring Diagram:
Dehumidification Heat Pump With Optional Economizer

1. Factory Jumper Installed.
2. Must be configured for economizer with YO/D output to be active as first stage cooling.
3. Factory-installed jumper (on applicable models).
4. These wires are used in special control applications only.
5. Remove jumper and connect to N.C fire alarm circuit if emergency shutdown required.

FIGURE 7

Low Voltage Wiring Diagram:
2 Stage Heat Pump With Optional Electric Heat
*With ECONWM Style Economizer**

MIS-2982 C

1. Must be energized to enable minimum position. NOTE: Economizer Control Default Setting is 10V (100%). Depending upon application may require setting to lower value.
2. Must be configured for heat pump and economizer to enable YO/D output to be active as 1st-stage cooling
3. Factory Jumper Installed.
4. Factory-installed jumper (on applicable models).
   Remove jumper and connect to N.C fire alarm circuit if the emergency shutdown is required.

FIGURE 8

Low Voltage Wiring Diagram:
2 Stage Heat Pump With Dehumidification & Optional Electric Heat
*With ECONWM Style Economizer MIS-2999 A
**

1. Must be energized to enable minimum position. NOTE: Economizer Control Default Setting is 10V (100%). Depending upon application may require setting to lower value.
2. Must be configured for the heat pump to enable YO/D output to be active dehumidification output
3. Factory Jumper Installed.
4. Factory-installed jumper (on applicable models).
   Remove jumper and connect to N.C fire alarm circuit if emergency shutdown required.

FIGURE 9

Low Voltage Wiring Diagram:
2 Stage Heat Pump With CHCRV-5 or CRVMWH-3
Vent Option Package With Programmable Thermostat
With Optional On/Off CO2 Controller

1. Factory Jumper Installed
2. Do not connect “A” from tstat #8403-060 if an optional CO2 controller is used.
3. Wire only needed for dehumidification units
4. Must be configured to programmable and fan set to programmed for the “A” output to function during scheduled occupied periods
5. Factory-installed jumper (on applicable models).
   Remove jumper and connect to N.C fire alarm circuit if the emergency shutdown is required.

FIGURE 10

Low Voltage Wiring Diagram:
2 Stage Heat Pump With CHCRV-5 or CRVMWH-3
Vent Option Package With Programmable Thermostat
With Optional Modulating CO2 Controller MIS-3334 A

1. Factory Jumper Installed
2. Wire only needed for dehumidification units set to program for the “A” output to function  Must be configured to programmable and fan during scheduled occupied periods
3. Factory-installed jumper (on applicable models).
4. Remove jumper and connect to N.C fire alarm circuit if the emergency shutdown is required.

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