Thermostat Wiring Guide - International comfort products C9MVX Installation Instructions Manual

Thermostat Wiring Guide

1. These diagrams are for reference. See thermostat
wiring instructions for specific terminal assignments,
connections or operation.
2. Humidifier/humidistat is optional and not included
with the furnace.
3. Dehumidify feature (MPV & MVX models only) requires
thermostat with DEHUM feature or a separate dehumi-
distat to get the dehumidification operation. Dehumidis-
tat is optional and not included with the furnace.
4. Underlined terminal indicates intended use for multi-
ple function terminals.
5. TSIB terminals only available on MPV & MVX models.
6. Two--stage Air Conditioning or two--stage Heat Pump
capability only available with MPV & MVX models.
7. W2 furnace operation is from furnace control algo-
rithm SW1 DIP switch #3 (TT) set to OFF. Furnace
runs in Low Heat for 12 minutes then switches to High
Heat if heating call still exists.
HUM and DEHUM Terminal available from Thermostat. Humidifier Wiring (*9MPT, *9MPV, *9MVX)
Figure 50
Models and Dehumidify Wiring (*9MPV & *9MVX Models only)
440 01 2024 04
TSIB
NO CONNECTION
NO CONNECTION
TWO-STAGE or VS
FURNACE
CONTROL
SINGLE-STAGE
THERMOSTAT
W
Y
G
R
NOTE 3, 9, 10
DEHUM
C
HUM
Specifications are subject to change without notice.
8. 24V HUM terminal on furnace control is used to power
a humidifier (on call for heat and pressure switch
closed) if no HUM thermostat option is available.
9. DEHUM provides a 20% reduction in airflow (when Y1
or Y1 + Y2 is energized) when the furnace control DE-
HUM terminal is energized with 24V.
10. If no DEHUM thermostat option is available, a dehu-
midistat that has closed contacts on a call for dehu-
midify may be used
11. O provides a 10% reduction in airflow when Y1 or Y1 +
Y2 is energized and O is NOT energized. (J2 jumper
on TSIB must be in HP COMFORT position to get this
function. AC/HP EFFICIENCY position results in no
reduction of airflow for Y1 or Y1 + Y2 calls regardless
of O being energized or not.)
12. For Heat Pump/Furnace systems, refer to Fossil Fuel
Kit or Dual Fuel Thermostat Installation Instructions
for wiring.
NOTE 5
Y1
O
NOTE 11
W2
NOTE 7
SINGLE-STAGE
W1
AIR CONDITIONER
Y/Y2
G
R
DEHUM
C
OM
24V HUM
OPTIONAL
HUMIDIFIER
24V in
COM
NOTE 2
Y
C
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