Venstar T1900 Installation - Manual (Page 12)

Page 4.1
SECTION 4
Wire Connections
4
If the terminal designations on your old thermostat
do not match those on the new thermostat, refer
to the chart below, or the wiring diagrams
that follow.
* O/B is used if your system is a Heat Pump.
** For instructions on connecting these terminals see page 16.2
of the Owner’s Manual.
Wire from the
old thermostat
terminal marked
Function
Install on the
new thermostat
connector marked
G or F Fan G
Y1, Y or C Cooling Y1
W1, W or H Heating W1/O/B
Power Rh, R, M, Vr, A R
C
O/B
C Common
Rev. Valve
W2 2nd Stage Heat
RS+5 Remote Sensor +5vdc
Remote Sensor Signal
CKGND Dry Contact Switch 2
RS+5**
RS1** RS1
RSGND Remote Sensor Ground RSGND**
CK1 Dry Contact Switch 1 CK1
CKGND
W1/O/B*
W2
MISC1
MISC2
MISC3
MISC1
MISC2
MISC3
RS2 RS2** Remote Sensor Signal #2
Configurable Output #1
Configurable Output #2
Configurable Output #3
AUTO
I2:00 Pm
HEAT COOL 72
74