Venstar T1900 Installation - Manual (Page 14)

Y1
G
R
C
MISC2
CK1
CKGND
W1/O/B
MISC1
RS+5
RS1
RSGND
W2
6 Conductor 18 gauge
unshielded cable from the
thermostat to the equipment.
24 vac return
fan relay
compressor relay
1st stage heat circuit
W
1
W
2
G
R
C
Y
1
RS2
6 Wire, 1 Stage Cooling, 1 Stage Heat
24 vac common
2nd stage heat circuit
MISC3
HP GAS
B O
ELEC GAS
(F A N )
W1
Y1
G
R
C
MISC2
CK1
CKGND
W2
MISC1
RS2
RSGND
MISC3
RS+5
Rs1
W3 PROG HUM DEHUM
MISC3 MISC2 MISC1 Y2 (MISC1
ONLY)
INSTALL HUMIDITY MODULE WITH SENSING ELEMENT OUTWARD
1 2 4 6 8 X Z
1 5 7 9 Y 3
H U M N O H U M
HP
GAS
B
O
ELEC
GAS
(F
A
N
)
Residential & Commercial 1 Stage Cooling,
with 1st stage Gas Heat Commercial Heat Pump 1 Stage Cooling
with 2 Stage Heat OR
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