Table of Contents
Advertisement
5
Wiring Chart
For all systems, the following terminals are wired according to whether you have a single or dual transformer
system as shown:
1
Single Transformer
*
System
Jumper should remain installed
24 VAC – Heat
2
Dual Transformer
*
System
PROVIDED
JUMPER
Table 5-1 - Terminal Wiring Depending on Type of Transformer Used
1. *FAILURE TO IDENTIFY GROUNDED COMMON COULD CAUSE SEVERE DAMAGE TO HVAC SYSTEMS.
2.* FAILURE TO REMOVE PROVIDED JUMPER ON DUAL TRANSFORMER INSTALLATIONS COULD CAUSE SEVERE DAMAGE TO HVAC SYSTEMS.
The following terminals on the thermostat Mounting Plate are wired according to the type of HVAC system
connected to and the thermostat is configured as.
Conventional HVAC
Heat Pump
Table 5-2 - Terminal Wiring Depending on Type of HVAC System
5.1. Communication and Sensor Connections/Terminals
SCOM
S1
S2
Remote
Sensor
Indoor
OAT
Common
Temperature
(RMT)
Table 5-3 - Communication and Sensor Connections/Terminals
Communication and Sensor Connections/Terminals
RH
RC
24 VAC Hot
24 VAC – Cool
2
REMOVE
*
REMOVE
PROVIDED
JUMPER
Y1
Cool Mode
Cool Mode
Stage 1
Stage 2
Compressor
Compressor
Contactor
Stage 2
S3
Supply Air
Temperature
C
24 VAC
Common
24 VAC
Common
Y2
W/E
Heat Mode
Stage 1
AUX
Heat Stage 1
B+
A-
MCOM
485
485 MODBUS
MODBUS
Connections
Shield
L
System/Comfort
Alert
Blower/Fan
Diagnostics
System/Comfort
Alert
Blower/Fan
Diagnostics
W2
Heat Mode
-
Stage 2
AUX Heat
Reversing
Stage 2
Valve
EC_OUT
EC_COM
Economizer
Economizer
Analog Output
Analog
(+)
Output (-)
Wiring Chart • 19
G
O/B
Advertisement
Table of Contents
