SYSTEM OPERATION
25
Pin
Voltage
Function
1
24VAC
Indoor/Outdoor Thermostat (IDT/ODT) Output
2
24VAC
High Stage Compressor Output
3
24VAC
Pressure Switch/Loss of Charge Switch Input
4
24VAC
Indoor/Outdoor Thermostat (IDT/ODT) Input
5
24VAC
Pressure Switch/Loss of Charge Switch Output
6
24VAC
Low Stage Compressor Output
Table 1: Circuit Definitions and Voltage Ratings
for the 6-Circuit Connector Circuits
Pin
Voltage
Function
1
24VAC
Limit Switch Output
2
24VAC
24VAC Input to Control
3
24VAC
Limit Switch Input
4
24VAC
Unused
5
24VAC
24VAC Common
6
24VAC
Pressure Switch Output
7
24VAC
Main Valve High Output
8
24VAC
Pressure Switch Input
9
Unused
Main Valve Low Output
Table 2: Circuit Definitions and Voltage Ratings
for the 9-Circuit Connector Circuits
Terminal
Label
Line Voltage L1
L1
Transformer Line L1
L1
Air Circulating Blower Line 1
L1
Induced Draft Blower Low Speed
DI Low or "Inducer Low"
Induced Draft Blower High Speed
DI High or "Inducer High"
Condenser Fan Motor Low Speed
ODF Low
Condenser Fan Motor High Speed
ODF High
Line Voltage L2
L2
Transformer Line L2
L2
Air Circulating Blower Line 2
L2
Induced Draft Blower Line 2
L2
Condenser Fan Motor Line 2
L2
Direct Spark Igniter
T1
Flame Detection
FS
Table 3: High Voltage Terminals