3
Option13 --Room AirTemperatureOffset
Selections: ±5_F/±3_C.Default is 0.
Thenumber of degrees to be added to the displayedtemperature to
calibrate or deliberately miscalibrate the measured room
temperature. This option is in _FevenifOption3issetfor_C.
Step 4 — Understand Thermostat Operation
TemperatureDispla y
Thermostat will displayroom temperature until UP or DOWN
button is pressed. The words SET TEMP appear when these
buttons are pressedand the current setpoint is displayed. If no
buttonsare pressedfor 5 sec, the displaywill change back toshow
room temperature.
Backlighting
Continuousbacklighting is not available. The backlightwill come
on for 10 secondsafter any button press.Without AC power and
when the battery is low, the backlight will remain off with button
presses.
Battery Indicator
A battery indicationicon 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 batteryoperation, 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 secondbacklight
disappears.When thebattery is absent or depleted,the display goes
blank exceptfor an empty battery iconand all outputs are turned
off.
TimeguardTimer
A 5--minute timeguard is built into the thermostat immediately
upon power up, and any time the compressor turns off. The
compressorwill not turn on until the timeguard has expired. The
timeguard affects only compressor operation.Pressing UP and
FAN buttons simultaneously will overridethe timeguard for 1
cycle.If PTAC operation (PH or PC) is selectedunder Option 1,
the timeguard timer is eliminated.
CycleTim er
In normal heatingand cooling operation the thermostatwill not
allowmore than 4 equipment cyclesper hour (or 1 cycle every15
minutes).Both the Y and W outputs have a 15--minutetimer that
starts countingdown when the output is turned on, (e.g., if Y
output isturned on for 9 minutes and thensatisfies, it cannotturn
back on for another6 minutes regardless of demand). However,
pressing UP and FANbuttons simultaneously or changing the
setpointwill overridethe timer for 1 cycle.
Minimumon 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.
StagingTimer
If the thermostat is a heat pump model, 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 g reater than 5_F/2.8_C, there
willbe only a 30 second delaybefore bringing on W.
Auxiliary Heat Indicator
When operating a heat pump and either auxiliary heat or
emergency heat is active, a front mounted LCD indicates this
condition.
A07821
ErrorMessages
Ifth e room temperature sensor fails, two dashes ( ----) will appear in
thetemperature displayand all heating and cooling outputswill 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 therm ostat must be replaced.
Step 5 — Check Thermostat Operation
Fan Operation
1. Press FANbutton. This will start continuousfan operation.
FANON icon will turn on.
2. Press FAN button again. This will stop continuous fan
operation.FAN ON iconwill turn off.
HeatingOperation
1. Press H/C butto n until HEAT is displayed.
2. Press UP button until LCD readout reads3_F/1.7_C above
room temperature. Press UP and FAN buttons
simultaneously to defeat timers. Heating system should
beginto operate immediately.
3. For HP thermostatsonly, press H/C button until EMHT
(emergency heat) appears. Press UP and FAN buttons
simultaneously to defeat timers. Emergency heating (W is
ON,Y is OFF) should begin immediately.
CoolingOperation
1. Press H/C butto n until COOL is displayed.
2. Press DOWN button untilLCD readout reads 3_/1.7_C
below room temperature. Press UP and FAN buttons
simultaneously to defeat timers. Cooling system should
beginto operate immediately.
Table 1 shows the thermostat outputs for each availab le stage of
heating or cooling. It may be useful in checkout or
troubleshooting.
T1--PAC / T1-- PHP