5
1.5 Remove coin cell battery tab
1.5a Remove tab to activate coin
cell battery.
NOTE:
Coin cell battery saves time
and date during a power loss.
1.6 Mount thermostat on wallplate.
Align thermostat at bottom and
snap into place as shown.
REMOVE DURING INST
ALLA
TION
REMOVE DURING INST
ALLA
TION
Thermostat
Coin
cell
battery
tab
MCR34009A
C
K
R
C
R
U1
U1
24
VAC
C
R
SYSTEM
TRANSFORMER
24
VAC
HUM, DEHUM OR
VENT
TRANSFORMER
THERMOSTAT
POWERED
HUMIDIFIER,
DEHUMIDIFIER
OR VENTILATOR
120 VAC
LINE
VOLTAGE
120 VAC
LINE
VOLTAGE
MCR34010A
C
K
R
C
R
U1
U1
120 VAC
LINE
VOLTAGE
24
VAC
C
R
SYSTEM
TRANSFORMER
THERMOSTAT
NON-POWERED
HUMIDIFIER,
DEHUMIDIFIER
OR VENTILATOR
FIELD INSTALL JUMPER
BETWEEN R AND U1
CONNECTING A HEAT OR COOL STAGE TO U1
DEHUMIDIFICATION WITH LOW SPEED FAN
NON-POWERED HUMIDIFIER, DEHUMIDIFIER OR VENTILATOR
POWERED HUMIDIFIER, DEHUMIDIFIER OR VENTILATOR
Wire the thermostat universal relay to the low speed fan
for dehumidification control at the equipment. The
thermostat relay can be set to normally open or
normally closed in the thermostat installer setup.
U1 terminals are normally open dry contacts when set
up for a stage of heating or cooling.
You must install a field jumper if the stage of heating
or cooling is powered by system transformer. Do NOT
install a field jumper if the stage of heating has its own
transformer.
1
2
Normally open, dry contacts
Normally closed, dry contacts
MCR34014A
1
C
K
R
C
R
U1
U1
24
VAC
C
R
SYSTEM
TRANSFORMER
THERMOSTAT
DEHUMIDIFICATION
WITH LOW SPEED FAN
FIELD INSTALL JUMPER
BETWEEN R AND U1
OR
120 VAC
LINE
VOLTAGE
2
C
K
R
C
R
U1
U1
24
VAC
C
R
TRANSFORMER
THERMOSTAT
MCR34007A
HEAT STAGE 3, COOL
STAGE 3, BACKUP HEAT
STAGE 2 FOR HEAT
PUMPS, OR GEOTHERMAL
RADIANT HEAT
1
120 VAC
LINE
VOLTAGE
Wiring Diagrams