Lennox ALLIED Commercial TCA180S2B Standard Manual page 23

TABLE 2
TB1 TERMINAL DESIGNATIONS
Y1
Y2
Y3 Cool Stage 3 (N/A)
Y4 Cool Stage 4 (N/A)
W1
W2
A1
A2 Occupied Loop
G
R 24V To Thermostat
C
TEST Test Terminal (Disable Min Run Time)
TABLE 3
TB14 24VAC TERMINAL DESIGNATIONS
24VAC Uninterrupted 24 Volt Power
R 24 Volt Accessories (from T1 transformer)
T18 24 Volts (from T18 transformer)
C
TABLE 4
P142 TERMINAL DESIGNATIONS
Terminal
Y2 From Economizer (cool2)
Y2E To Processor (micro chip)
Y1 From Economizer
Y1E To Processor (micro chip)
24V To Smoke Detector
24V From T1 Transformer
A2 Occupied Loop from Thermostat
R
C Ground to Economizer
R From Transformer T1
C
K3 From Transformer T18
Y3 To Processor (micro chip)
Cool Stage 1
Cool Stage 2
Heat Stage 1
Heat Stage 2
Occupied Loop
Indoor Blower
Ground
Ground
Function
To Economizer
Ground
P113 TERMINAL DESIGNATIONS
Terminal
S49
S49
K10
K1 Freeze Stat to Compressor Contactor
S50
S50
K2 Freeze Stat To Compressor Contactor
K3
C
P88 TERMINAL DESIGNATIONS
Terminal
R
W1
Y1
C
G
BL OUT
W2
P118 TERMINAL DESIGNATIONS
Terminal
S53
S53
K68
K14
S95
S95
K146
Y4
C
C
T18
C
Page 23
TABLE 5
Function
Relay KA To Freeze Stat
From Freeze Stat
Relay KA To Outdoor Fan Relay
Relay KB To Freeze Stat
From Freeze Stat
KD To Fan Relay
Ground To Cooling Component
TABLE 6
Function
24V To A3
Heat Stage 1 to A3
Cooling Stage to A3
Ground to A3
Blower Demand to A3
Blower Out from A3
Heat Stage 2 to A3
TABLE 7
Function
Relay KC to Freezestat
From Freezestat
Relay KD to Outdoor Fan Relay
Freezestat to Compressor Contactor
Relay KC to Freezestat
From Freezestat
Freezestat to Compressor Contactor
Cool Stage 4 from TB1
Ground
Ground
24V from T18
Ground