User Guide

CK1
GND
RS
RS+5
W2
Y2
C
G
Y1
W1-O-B
R
About Advanced Features & Operation
DRY CONTACT SWITCH -
Central Time Clock, Occupancy Sensor, or a Telephone activated device
to force 1 or more thermostats into Occupied 1.
This feature allows an external device such as a
Connect wires to a time
clock or other device to
force the thermostat into
Occupied 1.
Important Note: For control of multiple
thermostats by 1 source, refer to the
enclosed yellow document P/N 88-175
‘Potential Phasing Problems’ before
installation.
The CK1 and GND terminals are ‘normally open.’ When the dry contact
is energized, shorting CK1 and GND together, the thermostat will be
forced into Occupied 1 setpoints and the Occupied 1 icon will blink
(page 9).
Note: The thermostat must be in Program On mode for this feature to
have any effect.
ELECTRIC HEAT - Selecting Electric Heat (
thermostat to turn on the fan immediately any time there is a heat
demand. Since most gas furnaces control the fan, this feature should be
off unless it is necessary for the thermostat to energize the fan with first
stage heat.
step #6, page 16), will cause the
The above figure assumes the minimum on time for the prior stage
has been met to allow the next stage to turn on, once the deadbands
have been exceeded.
Heat
Setpoint
Cool
Setpoint
Deadband Deadband DeadbandDeadband
db 1 db 1db 2 db 2
(adj. 1-6 ) (adj. 1-6 )
1st Stage
turn on
2nd Stage
turn on
1st Stage
turn on
2nd Stage
turn on
Heating
Cooling
TEMPERATURE
DECREASE INCREASE
(non-adj. 2 ) (non-adj. 2 )
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