- My heating
or cooling does not work. What can I do?
No Heat:
With the system set to heat, when the set point temperature
is raised or lowered past the room temperature, the
thermostat will make a soft click sound within about
5 seconds. Usually the sound indicates correct thermostat
operation. If the heat does not come on after raising
the temperature and hearing the click, check
the fuses or breakers, make sure the furnace is switched
on, and verify the blower compartment door is closed
properly. If no click sound is heard try resetting
the thermostat as described below.
No Cool:
Air conditioning systems usually include an outdoor
compressor and an indoor blower. With the thermostat
set to COOL and the temperature lowered below the
room temperature by a couple of degrees, there can
be up to a five minute delay before the thermostat
activates the compressor and an indoor blower. If
both the compressor and an indoor blower are running
and the air is not cool it may indicate loss of refrigerant
in the compressor. If the blower or compressor do
not come on or do not shut off try the reset operation
below.
Reset Operation:
On Comfort-Set II models, removing the thermostat
battery (or batteries) for five minutes will reset
the thermostat. If a no heat or no cool condition
persists after resetting the thermostat you may wish
to contact your heating and cooling service person
for assistance.
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- My thermostat
is reading in Celsius. How do I change it to Fahrenheit?
For Comfort-Set
II models press and release the buttons TIME FWD and
TIME BACK at the same time to switch from Fahrenheit
to Celsius or Celsius to Fahrenheit.
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- My
thermostat does not display the temperature my thermometer
reads. Is there an adjustment to change the display?
The
temperature display on a digital thermostat will normally
read very accurately. If however, the heating and/or
cooling system is oversized or undersized or the location
of the thermostat is not ideal it can cause the temperature
display for the room to read high or low. The Comfort-Set
II series does not offer an adjustment to this room
temperature reading.
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- The
display shows the word or flashes BATTERY or BAT. What
does it mean?
Battery
(Flashing) on Display
Battery flashing or blinking on the digital display
indicates low batteries. If the batteries have recently
been changed and the thermostat continues to indicate
low batteries, use a pencil eraser to polish each
of the battery contacts inside the back of the thermostat.
Do not bend them up and down when polishing or you
might break them. When complete, they should all be
as shiny as a mirror. This will assure proper battery
back-up, allow the backlight to work correctly and
remove the flashing battery symbol from the screen.
Battery
(Solid) on Display
The battery symbol (not blinking) indicates a loss
of power (24 volts) from the heating and cooling equipment
to the thermostat. Normally the heating and cooling
do not operate when the battery indicator is on. If
the battery indicator is on, check the fuses or breakers,
make sure the furnace is switched on, and verify the
blower compartment door is closed properly. The battery
display is designed to indicate the thermostat is
running on batteries, so replacing batteries has no
effect on the indicator. See No Heat/No
Cool for more information. Note: Some heat only
systems (zoned systems) disconnect power from the
thermostat during a normal heating cycle and display
the battery symbol. Millivolt heating systems always
indicate battery because they do not supply 24 volts
to the thermostat.
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- How
do I bypass (not use) the program?
To
bypass the program and operate the thermostat manually
(like a mechanical model) press SYSTEM button to select
Heat or Cool (whichever your prefer) and press HOLD.
Use the Temp Up or Temp Down buttons to set the thermostat
on the temperature you want. The temperature setting
you choose will be held until you manually change
it using the Temp Up or Temp Down buttons. The thermostat
will remain in the HOLD mode when you change temperature
and maintain whatever temperature you set. If you
decide to return to the program, press PROGRAM RUN
to cancel the hold feature.
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- What
functions do the connecting terminals have on the subbase?
Typical
terminals and functions for most single stage models
(refer to specific installation instructions
for your type or model number when wiring or installing):
RH. . . . . . . . . . . .Power for heating.
RC. . . . . . . . .
. . .Power for cooling
Y. . . . . . . . .
. . . .Compressor
W. . . . . . . . .
. . . .Furnace
G . . . . . . . . .
. . . .Indoor Blower
O . . . . . . . . .
. . . .Powered constantly in cool
B . . . . . . . . .
. . . .Powered constantly in heat
MV . . . . . . . .
. . .Power for heating, millivolt system
6 . . . . . . . . .
. . . .#6 terminal for SPDT zone valve.
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- My
furnace (air conditioning) cycles too fast (slow). Is
there an adjustment?
Adjustable Heating and Cooling
Cycle Times (also called Anticipation ).
Most Comfort-Set II thermostats
have a feature that allows you to increase or decrease
the cycle times in heating and cooling. This is useful
if you think your cycle times are too long or too
short. Comfort-Set II is adjusted by pressing SET
CLOCK and SET DAY or ADV DAY at the same time and
then using the Temp Up or Temp Down arrows to adjust
the number displayed on the screen. The higher the
number you select, the longer the cycle. The lower
the number you select, the shorter the cycle.
The range of adjustment for HEATING
is from 2 to 40. The factory Preset is 5.
The range of adjustment for COOLING
is from 9 to 40. The factory Preset is 14. The cooling
will not go below 9 because compressors require a
longer cycle.
The chart below shows how this
adjustment range affects thermostat performance.
|
|
HEATING
|
COOLING
|
| Anticipation Reference Number |
Run Time in minutes
|
Differential Temp ΊF
|
Run Time in minutes
|
Differential Temp ΊF
|
| 2-8
|
4
6 |
0.4
0.6 |
N/A
|
N/A
|
| 9-20
|
6
10 |
0.6
1.0 |
6
10 |
0.6
1.0 |
| 21-40
|
10
16 |
1.0
1.6 |
10
16 |
1.0
1.6 |
|
These numbers are approximate and represent
operation with a typical system. Actual temperature
differentials and run times will vary based
on your building and equipment, as well as outdoor
temperature conditions. |
Your thermostat is designed to
cycle on and off in heating or cooling, keeping your
building in an accurate temperature range. This maximizes
your comfort by keeping the room temperature very
close to the temperature you set. It is not unusual
for your thermostat to be set for 70 and cycle on
and off at 70 keeping you right on target.
A
note on older style thermostats;
Anticipation on older style thermostats (mercury bulb
or mechanical) used the current draw of the equipment
to set the anticipation. Some heating and cooling equipment
manufacturers still refer to setting the anticipator
to the current draw of the equipment. This does not
apply to your new digital thermostat. Right from the
box your new thermostat will do an excellent job of
keeping your building at an accurate temperature. The
information above allows you to customize the performance
of your digital thermostat to your requirements.
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- Why
does the blower fan keep running after the system has
shut off?
Normally
the blower will turn off a within a few minutes after
the call for heat or cool. The blower running after
the system shuts off may indicate (1) the thermostat
is set to FAN ON, (2) the fan has been programmed
to run at that time period or (3) something has damaged
the thermostat or equipment. If the thermostat display
indicates FAN ON, press the fan switch once to set
it to FAN AUTO, meaning the fan will cycle only
with the equipment. If the display indicates PRG FAN
(Program Fan), sometime during programming, the FAN
switch was pushed. To remove PRG FAN (Program Fan),
check all of the programmed times and temperatures.
When you encounter PRG FAN, press the FAN switch to
remove it from that time period in the program. As
a final test, switch the thermostat to OFF. Verify
that Fan On or Fan Auto is not displayed. If the fan
continues to run, you may want to contact your heating
and cooling service person for assistance.
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- What
do AUX, EMER, and MALF indicators mean on my HEAT PUMP
THERMOSTAT?
AUX - Auxiliary Heat or
the second stage of heat in the Heat mode. This is
energized when the Heat Pump is not keeping up with
the thermostat setting. It is normal operation with
most pumps for the thermostat to call for auxiliary
heat. If the auxiliary heat and emergency heat are
using the same back-up heat source the thermostat
may also show the Emergency Heat light whenever the
Auxiliary heat is on.
EMER - Emergency Heat.
When switched to Emergency the thermostat bypasses
the pump and uses the back-up heat. This is useful
if the pump is not operating correctly or if the temperature
outside is so cold that the pump is not economical
to run. If the Auxiliary Heat and Emergency Heat are
using the same back-up heat source the thermostat
may show the Auxiliary and Emergency Heat light on
at the same time.
MALF - Malfunction. Malfunction
indicates the heat pump system is sending a signal
to the Malfunction Indicator on the thermostat terminal
marked L. It does not indicate a malfunction in
the thermostat. The manufacturer of the Heat Pump
system can determine the likely cause of malfunction
indication on the thermostat.
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- Why
won't the thermostat bring on second (and/or third)
stage of heat or cool?
Multi-stage
and Heat Pump Comfort-Set II thermostats are 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 thermostat
to bring the second stage on quickly. There is a time
delay from 0-25 minutes if the system has been reaching
your setpoint using the first stage. The time element
(0-25 minutes) of the delay varies depending on the
performance of the first stage. In Heating, for example,
assume for the last 2 hours the thermostat is set
on 70 and the room temperature is 70 with the equipment
using only the first stage of heat. The thermostat
calculates (internally) the performance of the system.
Since the equipment is keeping the temperature within
1 degree of setpoint, the thermostat will 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 room temperature. The net effect of the staging
program is when the first stage is capable of making
temperature the second stage will delay longer. When
the thermostat calculates that first stage cannot
make temperature in a reasonable time, the second
stage will come on sooner. This is a built in function
that automatically optimizes the use of additional
stages of heat or cool.
Most thermostat models have a method to bring the
additional heat or cool stages on quickly for testing
purposes listed in the installation instructions under
the heading of Testing Your Heat/Cool System.
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- Do
I have to program a stop time for each program period?
There
is no need to select a time to stop a programming
period. Starting a new programming period will stop
the previous program period.
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- My
display light does not work. Can it be fixed or replaced?
The
display light in the 1F90 series is not a replaceable
item. On single stage thermostats (1-heat/1-cool)
the light uses battery power. If the light is not
coming on, replace the batteries and/or clean the
battery contacts inside the back of the thermostat.
Use a pencil eraser to gently polish each of the battery
contacts. Do not bend them up and down or they may
break. When complete they should be as shiny as a
mirror. This will assure proper battery back-up and
allow the backlight to work correctly. The multi-stage
and heat pump models obtain power for the light from
the 24 volt transformer so if anything in the system
interrupts power to the thermostat the light will
not operate.
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- My
thermostat does not follow its program. What should
I do?
Unless
the thermostat appears to be damaged, it will follow
the program that is in the memory. The most common
reason a thermostat will appear not to be following
the program is a programming error. Use the Quick
Programming Guide from the Technical Help Section
of our web site to check your program carefully. Verify
that the AM or PM settings are correct for each period.
Also verify that the Day of the week is set correctly.
Some models have a SET DAY button and other models
use the SET CLOCK button to synchronize the current
day of the week.
If the
clock does not keep accurate time and the program
defaults to the factory program, check or replace
the batteries and clean the battery terminals as described
in Question #4.
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- Between
heating and cooling seasons, I want to turn my system
off. Will this change the program?
Any
time you wish to turn your system off, simply press
SYSTEM button until the display shows OFF. This will
not affect your thermostat's programming in any way.
To turn the system back on, press SYSTEM button until
HEAT, COOL, etc. is displayed. The system will begin
operating according to the current thermostat program
unless the thermostat is in the HOLD mode. See OPERATING
YOUR THERMOSTAT in your Operating Guide.
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- Do I
have to reprogram my thermostat after I change the batteries?
Comfort-Set
II models retain the program for a short period of
time (10-30 seconds) after power and batteries are
removed. When power is restored, the thermostat will
default to the factory settings. 90 Series models
will retain the last program entered indefinitely
without power or batteries.
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- I can
not raise my Heating temperature (or) I can not lower
my Cooling temperature.
The
thermostat will not allow a temperature in Heating
set higher than the lowest Cooling temperature. This
keeps the program from trying to bring on heat and
cool at the same time. If you program your Cooling
temperatures (all cooling temperatures) so they are
1 degree higher that the highest Heating temperature
you intend to use when you switch to Heating there
will be no conflict.
