Advertisement
6
Additional Operation Features
Compressor Protection Feature
This thermostat includes an automatic compressor protection feature to avoid
potential damage to the system from short cycling. This thermostat automatically
provides a 5-minute delay after turning off the cooling system output to protect
the compressor. This protection is also present in the heat mode of operation on
heat pump systems to protect the compressor.
NOTE: The installer can bypass the compressor protection feature by pressing
the RESET button. This will erase all user program settings, returning all settings
to their default values. This should only be used during installation for testing
purposes or to reset a thermostat to regain normal operation.
Low Battery Detection and Replacement
This thermostat requires two (2) new, properly installed "AA"
Alkaline batteries to provide proper thermostat power when
24 volt AC power fails or is not connected to the thermostat.
When the batteries start to become too weak to provide
proper operation, the thermostat will begin to display a low
battery indicator.
The low battery indicator is provided to inform the user when the batteries
require immediate attention. We recommend replacing the batteries as soon
as the low battery indicator appears. If the batteries are not replaced after
the low battery indicator first appears, the thermostat may not provide
proper heating or cooling system operation.
Even if the low battery indicator does not appear, the batteries should be replaced
at least once a year, or if you plan on leaving the premises for over a month.
This thermostat can be powered from 24 volts AC or battery power. To determine
if 24 volt AC power is connected to the thermostat, refer to the installation and
wiring diagram section. If you cannot determine how this thermostat is powered,
call a professional service technician to determine the type of installation and the
proper operation of your system.
Non-Volatile Memory
In the event of a power failure, the Non-Volatile Memory feature allows all settings
to be recovered, eliminating the need to reset temperature and differential settings.
When AC power is restored after an outage or batteries are reinserted, all settings
are retrieved from memory and reinstated.
6
6
Additional Operation Features
Status Indicators
HEAT: This will turn on whenever the system switch
is in the HEAT mode. "HEAT" will flash when the
heating system is running.
COOL: This will turn on whenever the system switch
is in the cool mode. "COOL" will flash when the
cooling systems is running.
AUX (Model 1200 and 1200NC Only): This will turn on
when the auxiliary (second stage) of heating is active. The
auxiliary stage of heating is usually the least economical
stage of heat and typically runs when the first stage of heat
cannot keep up with the temperature demand.
NOTE: AUX is also displayed when the system switch is in
the Emergency (EMER) Mode.
7
Battery Replacement
Replacing the Batteries
1. Open front cover and locate the battery compartment door.
2. Gently remove the two "AA" alkaline batteries located in the battery compartment.
3. Install two new "AA" alkaline batteries into battery compartment. Make sure to
match the positive (+) ends of the batteries with the positive (+) terminals
located in the battery compartment.
4. Close battery compartment. The low battery indicator should not appear
in the display.
8
Troubleshooting
Symptom: Thermostat does not turn on heating or cooling system.
Potential Solution: Check to see if OFF is shown in display. This indicates that the
system is turned off at the thermostat. Move system selector switch to HEAT or COOL
position. After the compressor short cycle protection 5-minute period expires, the
system should start.
Compressor protection feature may be in effect due to compressor short cycle
conditions. See Section 6.
Heating or cooling system may be malfunctioning. Call a professional service technician
immediately to verify system operation.
Symptom: Thermostat turns on heating instead of cooling, or cooling instead of heating.
Potential Solution: Check thermostat wiring to make sure the heating and cooling
stages are connected to the correct terminals on the wiring block. See Section 9.
Symptom: Thermostat turns heating or cooling system on too often or not often enough.
Potential Solution: Increase or decrease temperature differential settings as appropriate
to provide the desired performance level. See Section 4.
Symptom: Low battery indicator is blinking in thermostat display.
Potential Solution: Replace batteries immediately to maintain proper system operation.
See Section 7.
cont.
COOL
7
Hide quick links:
Advertisement
