8
Fan Operation —
If Fan On is selected, the fan will run
continuously during occupied schedule and Heat, Cool, and
Auto modes. The fan will be off during unoccupied schedule
except during heating or cooling operation.
If Fan On is not selected, the fan will only operate during
heating or cooling operation.
NOTE: The Fan button is ignored when Security levels 2 or 3
are in effect.
Emergency Heat —
Emergency heat is available for
heat pump applications. To turn on emergency heat, press and
hold the Override button. While holding the Override button,
press the UP button. An ‘‘EH’’ will be displayed. During emer-
gency heat, the fan will operate and the second stage of heat
will be energized (locking out the first stage compressor). To
exit emergency heat, press and hold the Override button. While
holding the Override button, press the UP button. During emer-
gency heat, only OFF and HEAT modes are available.
Electric Heat —
When the Electric Heat option in the
Advanced Setup is set to ON (configured by installer), the ther-
mostat will turn on the fan immediately any time there is a heat
demand. This feature should only be used on first stage electric
heating applications. Do not use with gas heat.
Holiday Mode —
When the thermostat is in Holiday
mode, the thermostat will operate under Unoccupied set points.
To configure and activate the Holiday mode, press the Mode
and UP ARROW buttons simultaneously to enter into Pro-
gramming mode. Press the Override button to enter into Holi-
day Programming mode. The ‘‘HOL’’ icon will be displayed
along with the remaining days of Holiday mode operation.
Press the UP or DOWN ARROWS to select the number of
days that the holiday schedule will be in effect. A value of 0
disables Holiday mode. The duration can be set from 1 to 99
days. The thermostat will enter Holiday mode on midnight of
the next day after the mode has been activated. Holiday mode
will remain in effect until midnight of the last configured day.
If the Holiday mode is in effect, the number of days remain-
ing and the ‘‘HOL’’ icon will be displayed. The Override but-
ton will be active during Holiday mode. The Dry Contact
Switch is ignored.
To turn off the Holiday mode before the remaining config-
ured days have passed, press the Mode and UP ARROW but-
tons simultaneously to enter into Programming mode. Press the
Override button to enter into Holiday Programming mode.
Press the DOWN ARROW to set the number of days to zero.
Holiday mode will be disabled.
Remote Temperature Sensor (33CS250-FS
Only) —
A remote temperature sensor is available to read
the temperature from a space. If a remote temperature sensor is
connected, the thermostat will ignore the reading of its internal
sensor. When the thermostat is using a reading from a remote
sensor, the degree symbol above the temperature reading will
blink.
NOTE: An outdoor-rated temperature sensor or a duct temper-
ature sensor can be used with the remote temperature sensor
wiring connections instead of a remote temperature sensor.
However, no matter which sensor is used, the thermostat will
ignore the reading of its internal sensor and control to the
accessory sensor reading unless the Sensor Type configuration
is set to yes.
Keypad Lock —
To prevent unauthorized use of the ther-
mostat, the front panel buttons can be disabled. To disable or
lock the keypad, press and hold the Mode button. While hold-
ing down the Mode button, press the UP and DOWN ARROW
buttons simultaneously. The ‘‘Locked’’ icon will appear on the
display.
The thermostat is unlocked by performing the same proce-
dure. Press and hold the Mode button. While holding down the
Mode button, press the UP and DOWN ARROW buttons si-
multaneously. The ‘‘Locked’’ icon will be removed from the
display.
Dry Contact Switch/External Control (33CS250-
FS) —
A dry contact switch is provided to allow an external
device to force the thermostat into Unoccupied mode. When
the thermostat is forced into Unoccupied mode via the dry con-
tact closure, the Unoccupied icon will blink each second. The
external device is wired to contacts CK1 and GND. See Fig. 9.
NOTE: Twenty-four volt power is not required for CK1 and
GND.
When using the auxiliary input or controlling multiple
HVAC units with a single thermostat, it is possible to encounter
transformer phasing problems that will interfere with thermo-
stat operation.
110 VAC
TIMECLOCK
TRANSFORMER
ISOLATION
RELAY
COIL
THERMOSTAT
THERMOSTAT
THERMOSTAT
CK1
GND
CK1
GND
CK1
GND
NOTE: Additional relays may be used. Relay coils must be connected in parallel.
Fig. 9 — Typical Dry Contact Switch Wiring
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