10
“HM” terminal) if the actual humidity is below the humid-
ity set point. The display indicates AH. Pressing the
key will cycle the display from OFF to H (feature enabled
in Heat mode) to C (feature enabled in Cool mode) to A
(feature enabled to Auto mode) and back to OFF.
42. Cycle Humidifier (CH) – This feature provides an op-
tion that reduces the water usage by up to 50% when a
flow-through humidifier is controlled by the thermostat. It
is recommended for use on flow-through humidifiers only.
The display indicates CH (Cycle Humidifier) with the de-
fault indicating OFF. Pressing the or keys will toggle
the display from OFF to On and back to OFF. When CH is
enabled, the humidifier will cycle to turn off for 10 minutes
after it has run for 10 minutes. The blower and/or furnace
will continue to run during the humidifier off period.
43. Programmable Dehumidification Optimal Comfort
Mode (OC) or Optimal Dehumidification (Od) – This
item can be selected to OC (Optimal Comfort mode), Od
(Optimal Dehumidification), or OFF. When Optimal Com-
fort (OC) is enabled, this feature automatically reduces
indoor humidity with a call for Cooling if humidity is 2%
above humidity setpoint. Humidity is set by pressing the
Humidity key when in the appropriate mode, in this case
Cooling, and pressing the or keys to set desired
humidity (range 40% to 95%) level followed by pressing
Humidity key again. This dehumidification feature uses
less energy by maintaining temperature and dehumidify-
ing only when a call for Cooling is required. Optimal De-
humidification (Od) when enabled, this feature automati-
cally reduces indoor humidity with a call for Cooling if
humidity is 2% above setting. Humidity is set by pressing
the HUMIDITY key when in the appropriate mode, in
this case Cooling, and pressing the or keys to set
desired humidity level followed by pressing Humidity key
INSTALLER/CONFIGURATION MENU again. This dehumidification feature may use more energy
by making dehumidification a priority initiating a call for
cooling if humidity is 2% above desired setting. This
feature may also over-cool the condition space by up to 3
degrees to achieve the desired humidity level. (Note: Both
dehumidification modes operate in Cooling mode only
with a call for cooling)
44 & 45. Change UV Lamp – This feature allows the thermo-
stat to display the words "Change UV Lamp" (Call for
Service of UV bulb) after a set time of UV bulb operation.
This is a reminder to maintain your UV system at opti-
mum level of operation. When enabled, the factory set
interval for "Change UV Lamp" to be displayed is 350
days of UV bulb operation and can be adjusted in 25 day
increments. This should be adjusted with respect to the
bulb’s recommended maintenance schedule.
When "Change UV Lamp" is displayed, you can clear it
by pressing Clean Display.
46 & 47. Change Humidifier Pad – This feature allows the
thermostat to display the words "Change Pad" after a set
time of humidifier operation. This is a reminder to main-
tain or clean your humidifier. The factory set interval for
"Change Pad" to be displayed is 100 hours of humidifier
operation. This should be adjusted with respect to the
humidifier’s recommended maintenance schedule.
When "Change Pad" is displayed, you can clear it by
pressing Clean Display.
48 & 49. Select Change Filter Run Time – This feature
allows thermostat to display "Change Filter" after a set
time of blower operation. This is a reminder to change
or clean your air filter. This time can be set from 25 to
1975 hours in 25 hour increments. A selection of OFF will
cancel this feature. When "Change Filter" is displayed,
you can clear it by pressing Clean Display. In a typical ap-
plication, 200 hours of run time is approximately 30 days.
OPERATING YOUR THERMOSTAT If at any time during testing your system does not operate
properly, contact a qualified service person.
Fan Operation
If your system does not have a G terminal connection, skip to
Heating System.
1. Turn on power to system.
2. Press FAN key to ON position. The blower should begin
to operate.
3. Press FAN key to AUTO position. The blower should
stop immediately.
To prevent static discharge problems, touch side of
thermostat to release static build-up before touching
any keys.
NOTE
Check Thermostat Operation
Do not allow the compressor to run unless the compres-
sor oil heaters have been operational for 6 hours and the
system has not been operational for at least 5 minutes.
CAUTION
!
Heating/Humidifier
1. Press SYSTEM key to select HEAT. If the auxiliary heating
system has a standing pilot, be sure to light it.
2. Press to adjust thermostat setting to 1° above the
room temperature. The heat pump system should begin to
operate. The display should show "System On". How-
ever, if the system configuration is set to HP1 or HP2
and setpoint temperature display is flashing, the 5 minute
compressor lockout feature is operating (see Configura-
tion menu, item 11).
3. Adjust temperature setting to 3° above room temperature.
If your system configuration is set at MS2, HP1 or HP2,
the auxiliary heat system should begin to operate and the
display will show "System On +2".
4. Press to adjust the thermostat below room tempera-
ture. The heating system should stop operating.
To check the humidifier when System On appears and the
heating system is running press the HUMIDITY* button once.
Press to adjust the humidity 2% or more above the room
humidity level setpoint range. (Humidity setpoint can be
adjusted from 5 to 50%.) Hum On will appear indicating it is
calling for the humidifier.
*Note: If Auto Schedule is displayed instead of Humidity,
Auto Schedule must be turned off in the Configuration Menu.