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OPERATING YOUR THERMOSTAT
Check Thermostat Operation
NOTE
To prevent static discharge problems, touch side of
thermostat to release static build-up before touching
any keys.
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 button. The display will change from "
"Fan" and the blower should begin to operate.
3. Press FAN button again. The display will change from "Fan"
to "
" outlined and the blower should stop immediately.
CAUTION
!
Do not allow the compressor to run unless the
compressor oil heaters have been operational for 6
hours and the system has not been operational for at
least 5 minutes.
Heating System
1. Press the HEAT button 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 room
temperature. A click will be heard from the thermostat and
the heat system should begin to operate. If the system
configuration is set to HP1 or HP2 and setpoint tempera-
ture display is flashing, the 5 minute compressor lockout
feature is operating (see Configuration menu, item 7).
3. If your system configuration is set at MS2, HP2 or HP1,
adjust temperature setting to 3° above room temperature.
The thermostat will click and the second stage will begin
to operate.
4. Press
to adjust the thermostat below room tempera-
ture. The thermostat will click several times as stages
de-energize. The heating system should stop operating.
Second Stage Time Delay
Your thermostat is designed to determine the optimum time to
activate the second stage. Simply raising the temperature in
heating or lowering it in cooling will not always force the ther-
mostat to bring the second stage on quickly. There is a time
delay from 0-30 minutes depending on the performance of the
first stage of the system.
EXAMPLE: For the last 2 hours the thermostat is set on 70
and the room temperature is 70
only the first stage of heat. Since the equipment is keep-
ing the temperature within 1
delay second stage for a longer time if you manually raise
the temperature or if the room temperature quickly changes.
Once the second stage comes on, it will come on sooner the
next time there is a difference between the setpoint and the
with the equipment using
o
of setpoint, the thermostat will
o
room temperature. The net effect of the staging program is
that when the first stage is capable of making temperature the
second stage will delay longer. When the thermostat calcu-
lates that first stage cannot make temperature in a reason-
able time, the second stage will come on sooner. This built in
function automatically optimizes the use of additional stages
of heat or cool.
Auxiliary (Emergency) System
AUX bypasses the Heat Pump to use the heat source wired
to terminal W/E on the thermostat. AUX is typically used
when compressor operation is not desired, or you prefer
back-up heat only.
1. Press and hold HEAT button for at least 5 seconds. "Aux"
" to
will change to "Aux".
2. Press
to adjust thermostat setting above room tem-
perature. The Auxiliary heating system will begin to operate.
3. Press
to adjust the thermostat below room tempera-
ture. The Auxiliary heating system should stop operating.
4. To return to Heat Pump mode press "HEAT" button. "Aux"
will change to "
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
1. Press A/C button to select A/C.
2. Press
to adjust thermostat setting below room
temperature. The blower should come on immediately at
high speed, followed by cold air circulation. If the setpoint
temperature display is flashing, the compressor lockout
feature is operating (see Configuration menu, item 7).
3. Adjust temperature setting to 3° below room temperature.
A click from the thermostat will be heard and the second
stage cooling should begin to operate.
4. Press
to adjust the temperature setting above room
temperature. The thermostat will click several times and
the cooling system should stop operating.
(Configuration Menu item 20)
Heat Pumps with gas or oil furnace Auxiliary heat are called
Dual Fuel systems. Step 20 in the configuration menu is a
Dual Fuel (dF) option that uses software logic to determine
when to switch to gas heat and shut down the compressor.
This eliminates the need for a separate fossil fuel kit.
To configure the thermostat for Dual Fuel, select a setting
from 1-9. An initial selection of 5 is recommended. A higher
o
number will provide a smaller stage separation so the Aux-
iliary heat will start sooner providing more comfort. A lower
number will provide a larger stage separation delaying the
start of the Auxiliary heat providing more economy. A selec-
tion of -0- cancels the dual fuel option and is used for heat
pump systems with electric heat auxiliary (non-dual fuel
systems).
"
CAUTION
!
Cooling System
Dual Fuel Setting
7
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