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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

105

Содержание DEBONAIR 33CS

Страница 1: ...most serious hazards which will result in severe personal injury or death WARNING signifies a haz ard which could result in personal injury or death CAUTION is used to identify unsafe practices which would result in minor personal injury or property damage GENERAL The commercial 7 day programmable thermostats are wall mounted low voltage thermostats which maintain room temperature by controlling t...

Страница 2: ... is a hazardous waste and must be disposed of properly 3 Install 2 x 4 in junction box field supplied in wall See Fig 1 4 Route thermostat wires through back of junction box Re move outer sheath from wires for added flexibility Standard solid or multi conductor thermostat wire should be used from the thermostat to the unit Size and length considerations are as follows for a maximum distance from u...

Страница 3: ...o prevent adjacent wires from shorting together Match and connect wires to terminals on the thermostat See Fig 2 and Table 1 5 Attach thermostat to wall On paneling installations see Fig 4 a Push thermostat into hole in wall Make sure tabs on paneling match up with mounting holes on thermostat b Using two 11 2 in self tapping screws attach thermostat to wall Make sure thermostat cover is flush aga...

Страница 4: ...ing UP ARROW or DOWN AR ROW To ensure the schedules are properly followed make sure that AM or PM is correct for the time chosen When the correct time is shown press the Mode button to modify the day of the week The current day will blink on and off Press the UP ARROW and DOWN ARROW buttons until the correct day is shown Press the and hold the Mode and Override buttons at the same time again to ex...

Страница 5: ...an application The soft start staggers the start up times of the units in the event of power loss and restart Each unit should be assigned a unit ID number The 30 second delay time is multiplied the unit ID number to get the total soft start delay time for each unit For example if the unit ID number is 10 set the Soft Start function to 10 the start up delay time is 30 seconds x 10 300 seconds 5 mi...

Страница 6: ...wer the cooling set point until the desired tem perature is shown The range of acceptable values is 35 to 99 F 1 to 37 C or OF no unoccupied cooling To configure the Unoccupied Cooling set point to OF press the UP ARROW button until 99 F is displayed Press the UP ARROW button again to display OF Press the Mode button to continue 5 The heating set point for Unoccupied will be displayed Use the UP A...

Страница 7: ...Press the UP or DOWN ARROW buttons until the flashing number equals room temperature 4 Press the Mode button again to return to normal operation Check Thermostat Operation To check thermo stat operation perform the following procedure 1 Press the Mode button repeatedly until the Heat icon ap pears on the display The thermostat is now in Heating mode 2 Press the UP ARROW button until the heating se...

Страница 8: ...ore 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 ...

Страница 9: ...check the unit wiring diagram See Fig 10 SOFT START When multiple thermostats are controlled by the same external device a Soft Start option can be used to stagger the turn on times of the HVAC equipment This feature may cause a delay in operation after entering Unoccupied mode 10 Watt Resistor A 10 watt 270 ohm resistor is pro vided with the thermostat This resistor should only be used in applica...

Страница 10: ...ac is not present replace the thermostat When using 4 wires R G W Y the cooling equipment tries repeatedly to turn on but cannot At times the display dims or disappears There is not enough power available Connect a 270 ohm 10 watt power resistor supplied with thermostat at the air conditioning equipment between terminals W and C non heat pump applications only When using 4 wires R G W Y the heatin...

Страница 11: ......

Страница 12: ...inue or change at any time specifications or designs without notice and without incurring obligations PC 111 Catalog No 533 352 Printed in U S A Form 33CS 35SI Pg 12 105 9 00 Replaces New Book 1 4 Tab 11a 13a Copyright 2000 Carrier Corporation ...

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