Carrier COBRA 48/50HJ004-014 - Manual (Page 32)

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Option 2 — Clean Filter Timer — Select hours of blower
operation (heating, cooling, or fan) before CLEAN FILTER
icon is displayed. With OFF selected, icon will never come on,
disabling this feature. Time selection can range from 400 to
3600 blower operation hours by selecting numbers 1 through 9.
(Time is 400 times number selected.) Factory default is 2
(800 hr). Recommended blower operation hours selections are:
disposable filter — 400 to 800 hr; media filter — 1200 to
1600 hr; electronic air cleaner — 1600 to 2400 hr.
TO SELECT OR ADJUST:
1. Enter Configuration mode. Use up and down set point
buttons to make small display (now flashing) indicate 02.
2. Press SET TIME/TEMP button once to display current
selection of 1, 2, 3, 4, 5, 6, 7, 8, or 9 on large display.
Factory default is 2.
3. Use up and down set point buttons to move between
available choices.
4. Press SET TIME/TEMP button again to flash small
upper display for selection of another option, or press
HOLD End to exit Configuration mode.
Option 3 — English/Metric — Select between Fahrenheit
and Celsius operation. Factory default is Fahrenheit.
TO SELECT OR ADJUST:
1. Enter Configuration mode. Use up and down set point
buttons to make small display (now flashing) indicate 03.
2. Press SET TIME/TEMP button once to flash current se-
lection of F or C. Factory default is F.
3. Use up and down set point buttons to move between F
and C on large display.
4. Press SET TIME/TEMP button again to flash small up-
per display for selection of another option, or press
HOLD End to exit Configuration mode.
Option 4 — Fan (G) On With W — This selection deter-
mines whether fan (G) output is to be ON or OFF when any W
(furnace or strip heat) output is ON. Most furnaces and fan
coils manage their own blowers and do not require separate G
signal. For these applications, select OFF. Some auxiliary heat-
ers require separate G signal to turn on blower. In this case,
select ON. Factory default is OF (off).
TO SELECT:
1. Enter Configuration mode. Use up and down set point
buttons to make small display (now flashing) indicate 04.
2. Press SET TIME/TEMP button once to flash large
display.
3. Use up or down set point buttons to alternate between
OFF and ON on large display.
4. Press SET TIME/TEMP button again to flash small
upper display for selection of another option, or press
HOLD End to exit Configuration mode.
Option 9 — Holiday Heat Set Point — This selection deter-
mines the heating set point (40 to 90 minus deadband F) when
the HOLIDAY function is active.
TO SELECT:
1. Enter Configuration mode. Use up and down buttons to
make small display (now flashing) indicate 09.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down set point buttons to select desired
temperature.
4. Press SET TIME/TEMP button again to flash small
upper display for selection of another option, or press
HOLD End to exit Configuration mode.
Option 10 — Holiday Cool Set Point — This selection deter-
mines the cooling set point (40 to 90 minus deadband F) when
the HOLIDAY function is active.
TO SELECT:
1. Enter Configuration mode if not already there. Use up
and down set point buttons to make small display (now
flashing) indicate 10.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down set point buttons to select desired
temperature.
4. Press SET TIME/TEMP button again to flash small up-
per display for selection of another option, or press
HOLD End to exit Configuration mode.
Option 11 — Holiday Humidity Set Point — This selection
determines the humidity set point (50 to 90% rh [relative
humidity]) when the HOLIDAY function is active.
NOTE: This value can only be changed in the installer soft-
ware Configuration mode.
TO SELECT:
1. Enter Configuration mode. Use up and down set point
buttons to make small display (now flashing) indicate 11.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to select desired humidity.
4. Press SET TIME/TEMP button again to flash small
upper display for selection of another option, or press
HOLD End to exit Configuration mode.
Option 13 — Room Temperature Offset Adjust — This op-
tion allows calibration (or deliberate miscalibration) of room
temperature sensor. There are various reasons why building
owners may want to have displayed temperature adjusted to a
higher or lower value. The selected number is number of
degrees, plus or minus, which will be added to actual
temperature. The numbers can range between –5 and +5.
Factory default is 0. This adjusted value will be used as actual
temperature for both display and control action. For example, if
COPY PREVIOUS
DAY
CHANGE DAY
SET TIME/TEMP
PROGRAM MODE
HUMIDITY FAN
HOLIDAY HOLD
End
RESET
FILTER
UP
DOWN
HOLD HOLIDAY
Mode
OFF
HEAT
COOL
AUTO
COOL
HEAT
Fan
ON**
AUTO
CLEAN FILTER
PROGRAMMING
DEHUM
OC1 UN1 OC2 UN2
TIME AM PM
Mo Tu We Th
Fr Sa Su
Fig. 15 — Light Commercial Thermidistat Keypad
Fig. 16 — Light Commercial Thermidistat LCD
on Power Up