3
HP or PH controls 1 speed heat pump with 1 stage of aux heat.
AC or PC controls 1 speed air conditioner with one stage of heat.
Option 03 -- Fahrenheit/Centigrade
This selection operates the thermostat in either Fahrenheit or
Centigrade.
Selections: F = Fahrenheit — This is default.
C = Centigrade.
Option 04 -- G (fan) ON with W (Heat) Selection
Selections: OF = G not energized with W — This is default.
ON = G energized with W.
This selection determines whether the fan (G) is to be ON or OFF
when W (furnace or strip heat) is ON. Furnaces and fan coils which
manage their own blowers do not require a separate G signal. Some
auxiliary heaters require a separate G signal to operate the blower
when W is applied.
Option 10 -- Reversing valve
Applies only when configured for HP application.
Selections: C = reversing valve energized in cooling —This is
default.
H = reversing valve energized in heating
Option 13 -- Room Air Temperature Offset
Selections:
5
_
F/
3
_
C. Default is 0.
The number of degrees to be added to the displayed temperature to
calibrate or deliberately miscalibrate the measured room
temperature. The selected number is the number of degrees, plus or
minus, which will be added to actual temperature. This option is in
_
F even if Option 3 is set for
_
C.
Option 15 -- Auto Changeover
Selections: ON, OF — Default is OF.
The heat setpoint and cool setpoint are separated by a minimum of
2 degrees. This feature allows the thermostat to automatically
change between heating and cooling mode when a demand has
been present in the opposite mode for a period of 20 minutes.
Manually changing either the cooling or the heating setpoint will
allow an auto changeover to occur without the 20 minute time
constraint.
Option 21 -- Keypad Lockout
Selections: ON, OF — Default is OF.
With OF selected, the keypad cannot be locked. With ON selected
the keypad will be locked and can be unlocked by simultaneously
pressing the UP and DOWN keys for 5 seconds. Once unlocked, it
will relock 2 minutes after the last keypad press. If any key is
pressed and the thermostat is locked, “Loc” will be displayed in the
clock digits.
Option 26 -- Minimum Cooling Setpoint
Selections: 52
_
to 90
_
F/11
_
to 32
_
C — Default is 52
_
F/11
_
C.
Sets the lowest cooling setpoint available to the user.
Option 27 -- Maximum Heating Setpoint
Selections: 50
_
to 88
_
F/10
_
to 31
_
C — Default is 88
_
F/31
_
C.
Sets the highest heating setpoint available to the user.
Step 4 — Thermostat Operation
Temperature Display
Thermostat will display room temperature until UP or DOWN
button is pressed. The words SET TEMP appear when these
buttons are pressed, and the current setpoint is displayed. If no
buttons are pressed for 5 seconds, the display will change back to
show room temperature.
Backlighting
Continuous backlighting is not available. The backlight will come
on for 10 seconds after any button press. Without AC power and
when the battery is low, the backlight will remain off with button
presses.
Battery Indicator
A battery indication icon on the display shows nothing, half, or
low/no battery condition. If the battery is full or operation is from
AC power, no icon appears. Under battery operation, if the battery
is half full, a half full battery icon appears. As the battery depletes
below half, the icon remains at half, but the 10 second backlight
disappears. When the battery is absent or depleted, the display goes
blank except for an empty battery icon and all outputs are turned
off.
Timeguard Timer
A 5--minute timeguard is built into the thermostat immediately
upon power--up, and any time the compressor turns off. The
compressor will not turn on until the timeguard has expired. The
timeguard affects only compressor operation. Pressing UP and
FAN buttons simultaneously will override the timeguard for 1
cycle. With PH or PC selected under Option 1, this timer is
defeated.
Cycle Timer
In normal heating and cooling operation the thermostat will not
allow more than 4 equipment cycles per hour (or 1 cycle every 15
minutes). Both the Y and W outputs have a 15--minute timer that
starts counting down when the output is turned on, (e.g., if Y
output is turned on for 9 minutes and then satisfies, it cannot turn
back on for another 6 minutes regardless of demand). However,
pressing UP and FAN buttons simultaneously or changing the
setpoint will override the timer for 1 cycle.
Minimum On Timer
Once the equipment has turned on, it will remain on for a
minimum of 3 minutes regardless of demand. However, the
equipment can turn off in less than 3 minutes if a change in
setpoint or a change in mode occurs.
Staging Timer
If the thermostat is configured for a heat pump application, it has
2--stage heat capability. In normal operation there is a 15--minute
delay between the first and second stages of heat. The Y output
will energize first, then 15 minutes later, W is allowed to come on
if the thermostat determines it is not satisfying the demand.
However, if the heating demand is greater than 5
_
F/3
_
C, there will
be only a 30--second delay before bringing on W.
Auxiliary Heat Indicator
When operating a heat pump and either auxiliary heat or
emergency heat is active, the AUX HEAT icon will show on the
LCD.
Error Messages
If the room temperature sensor fails, two dashes (----) will appear in
the temperature display and all heating and cooling outputs will be
turned off. The thermostat must be replaced.
If the internal non--volatile memory fails, E4 will alternately flash
with the temperature on the display and all heating and cooling
outputs will be turned off. The thermostat must be replaced.
Step 5 — Check Thermostat Operation
Fan Operation
1. Press FAN button. This will start continuous fan operation.
FAN ON icon will turn on.
2. Press FAN button again. This will stop continuous fan oper-
ation. FAN ON icon will turn off.
