Installation and User Guide
16
Part No. 37-7760003
09-2018 18-HD48D1-1A-EN
3. O/B Terminal selection – Selects the operation of the
reversing valve (when item 1 is set to HP1 or HP2 only).
When set to “O” the changeover valve will be energized in
COOL to accommodate the majority of heat applications. If
the heat pump requires the changeover valve to energize
in HEAT, select “B”.
4. Programs per week – This control can be configured
for 7 independent day or 5+1+1 day programming or
nonprogrammable modes. Default is 7-day mode. The
display indicates “7 Days” as default. Other options “5
Days” or “0 Days” can be selected. If “0 Days” is selected
for non-programmable mode, the step for EMR will be
skipped, as this feature will not be available in this mode.
5. Program Steps per day – Not available if configured for
non-programmable. This control can be configured for
4 or 2 program steps per day. Default is “4 PS” and can be
toggled between 4 PS and 2 PS.
6. System Switch Configuration (MS2/SS1) – This
thermostat is configured for Heat and Cool with Auto
changeover default (Cool-Off-Heat-Auto). It can be
configured as Heat & Cool (Cool-Off-Heat), or Heat Only
(Off-Heat), or Cool Only (Cool-Off). When the control
is in heat pump configuration (HP1/HP2), the system
switch configuration will have an additional mode, Em for
Emergency.
7. Energy Management Recovery (EMR) – (this step is
skipped if configured as non-programmable). When set
to “On” causes the thermostat to start heating or cooling
early to make the building temperature reach the program
setpoint at the time you specify. Example: The heating
program is 65°F at night and 70° at 7 AM. If the building
temperature is 65°F, the difference is 5°F. Allowing 5
minutes per °F rise, the thermostat setpoint will change to
70° at 6:35 AM. Cooling allows more time per °F, because
it takes longer to reach temperature.
8, 9 & 10 Cycle Rate Selection - Heat, Cool, EM
The factory default setting is fast cycle (FA Cr) in all modes
(Heat, Cool, Em). To change to slow cycling (SL, Cr), press
touch keys or toggle between FA & SL. The cycle
rates are below:
Mode
Med
Slow
Heat
0.6°F
1.5°F
Cool
1.2°F
1.7°F
Heat Pump
1.2°F
1.7°F
Emer Heat
0.6°F
1.7°F
11. Stage Cycle Completion (SC On) will cause the
thermostat to complete heating and/or cooling cycles on
the highest stage engaged during the cycle. Thermostat
will not reduce heating or cooling stages before the
heating or cooling cycle is satisfied and all stages are
turned off.
12. Select Compressor Lockout (CL) – Selecting (CL On)
will cause the thermostat to wait 5 minutes between
cooling cycles. This is intended to help protect the
compressor from short cycling. Some of the newer
compressors have a time delay built in and do not
require this feature to be activated in the thermostat.
Your compressor manufacturer can tell you if this lockout
feature is already present in their system. When the
thermostat compressor time delay is activated, it will flash
the set point for up to five minutes.
13. Select Continuous Display Lighting (dL) – In low lighting
conditions, display backlight improves the display contrast.
14. Select Temperature Display Adjustment 5 LO to 5 HI
This allows you to adjust the room temperature display by
-5°F to +5°F in 1° steps. Your thermostat was accurately
calibrated at the factory, however you have the option
to change the display temperature value to match the
previous thermostat, if you so prefer.
15. Select °F or °C Readout – Changes the display readout
to Celsius or Fahrenheit as required.
16. Select Audio Prompting (Beeper) On or Off – Factory
default setting is b, On. If you wish to turn off the beeper
select OFF.
17. Select Daylight Saving Time Calculation – This feature
will allow the thermostat to calculate the DST automatically
and apply it to the Real Time Clock display. Default
is On.
18. Select Automatic Schedule – Heat Mode –
19. Select Automatic Schedule – Cool Mode –
Not available if configured for non-programmable. This
feature allows programming a “Comfort Temperature” into
all program periods with the Auto Schedule key. When
Heat AS (for Heat mode) or Cool AS (for Cool mode) is
selected On, the Auto Schedule feature is ready to be set.
Off indicates that the feature is not ready to be used or a
“Comfort Temperature” is already set. See Auto Schedule
in Programming section.
20, 21 Select Cool Savings™ – Cool Savings™ provides an
energy saving temperature offset (from 1-6 degrees) under
peak cooling load conditions (high outdoor temperatures).
If selected on, Cool Savings™ becomes active when the
air-conditioner runs for periods of longer than 20 minutes.
When active, Cool Savings™ gradually offsets the indoor
temperature display downward. The first 1° of adjustment
will take one hour of continuous air conditioner run time
with subsequent 1° adjustments occurring with each
additional half hour of run time (ex for a 2° offset, the air
conditioner would need to run continuously for 1 ½ hours).
The offset is limited to the number of degrees you select
from 1 up to 6. When an offset starts or is active, “Cool
Savings” will flash on the display.
The principle of this energy saving feature takes
advantage of the long air conditioning run times lowering
the indoor humidity allowing a slightly higher temperature
to feel comfortable. As the peak load subsides, this feature
also takes advantage of the air conditioner’s increased
capacity under more efficient conditions to gradually
reduce the offset back to zero and return control to the
selected setpoint temperature. If Cool Savings is selected
off, no temperature offset will occur.
22. Compressor Optimization – (Not available on earlier
models) CO provides a delay in circulator fan operation after
the compressor turns on or off. With CO selected ON, when
the compressor turns on (for a call for heat in heat pump or
a call for cool) the fan will be delayed for five seconds before
turning on to allow the air to be heated or cooled. After the
compressor turns off for call for cool, the fan will continue
to run for 20 seconds to capture additional cooling from the
system. If CO is set to OFF, there will be no delay in fan
operation.
