Alarm.Com ADC-T2000 - Page 6

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Terminal designations
Conventional system
Terminal Description
RC
Cooling power
RH
Heating power
Z
Configurable W3, H, DH or
O/B zoning
W
Heat stage 1
W2
Heat stage 2
W3
Heat stage 3
C
Common wire from secondary
side of heating transformer
(if 2 transformers)
Y
Cool stage 1
Y2
Cool stage 2
G
Fan
H
Whole home humidifier
DH
Whole home dehumidifier
O/B
Energized in cool mode
Heat pump
Terminal Description
RC
Cooling power
RH
Heating power
Z
Configurable W3, H, or DH
W
Aux stage 1
W2
Aux stage 2
W3
Aux stage 3
C
Common wire from secondary
side of cooling transformer
Y
Pump stage 1
Y2
Pump stage 2
G
Fan relay
H
Whole home humidifier
DH
Whole home dehumidifier
O/B
Reversing valve
Install the batteries
The thermostat can be powered by battery
or 24 VAC. If a wall transformer is used to
power the thermostat, connect between
C and RH.
Ensure the batteries are installed following
the specified polarity markings on
the thermostat.
CAUTION: SPECIAL BATTERY WARNING
• Always replace the batteries as soon as
you have low battery levels, indicated by
“LOW” then "BATT" flashing on the display.
If the batteries drain, the thermostat
could leave the HVAC system on or off,
overheating or freezing the home.
• Always replace the batteries at least once a
year. This will protect the thermostat from
damage and corrosion by leaking batteries.
• If the home is unoccupied for a month or
more, such as with vacation homes, you
should replace the batteries as a preventive
measure against battery failure while you
are away.
• Always use new batteries as replacements.