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SYSTEM OPERATION
10
L2
INDUCER
LOW HIGH
L1
OD F
LOW HIGH
T1
Q3
K4
K3
K5
K6
T2
K7
FS
U1
U2
U6
U7
U4
U5
U3
P2
K2
K1
ECON
STAGE
DELAY
C9
SPEED UP
SW1
FAULT
RECALL
BLOWER
OFF
DELAY
F1
R C W1W2 G
Y2
90
120
150
180
10MIN
5 MIN
NONE
PARK
1
2
3
4
5
Y1
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
Period
Timing
Pre-Purge
15 Seconds
Inter-Purge
30 Seconds
Post Purge
30 Seconds
Trial-for-Ignition (TFI)
7 Seconds
Flame Stabilization Period
10 Seconds
2 Seconds within Flame Stabilization Period
2 Seconds or Per ANSI Z21.20 Outside of Flame Stabilization Period
Low to High Stage Delay
Selectable 5 minutes or 10 minutes (Default = 10 minutes)
Heat ON Delay
30 Seconds
Heat OFF Delay
Selectable 90, 120, 150, or 180 Seconds
(Default = 150 Seconds)
High Stage Heat OFF Delay
30 Seconds
Cool ON Delay
6 Seconds
Cool OFF Delay
45 Seconds
Continuous Fan ON Delay
0 Seconds
Continuous Fan OFF Delay
0 Seconds
Ignition Attempts
3
Recycles
Infinite
Automatic Restart
60 Minutes
Pressure Switch Lockout Delay
5 Minutes
Factory Test Mode Active Time
2 Minutes Maximum
Flame Failure Response Time
Table 4: Control Timings
Color
Function
LED Flashes/Status
Normal
On
Intrnal/Gas Valve Fault
Off
Lockout
1
Pressure Switch Stuck Open
2
Pressure Switch Stuck Closed
3
Open High Temperature Limit
4
Flame Detected with Gas Valve De-Energized
5
Compressor Short Cycle Delay Active
6
Limit Opened 5 Times in Same Call For Heat
7
Indoor Thermostat/Outdoor Thermostat is Open
8
Pressure Switch/Loss of Charge Switch is Open
9
Normal Flame
On
No Flame Present
Off
Low Flame Current
1
Flame Detected with Gas Valve De-energized
2
Red
Amber
Table 5: LED Status Codes and Corresponding
System Condition