4
XT500C DELUXE PROGRAMMABLE HEAT-PUMP THERMOSTAT
69-1404
Pub. No. 18-HD25D2-2
Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Fan operates with equipment.
Fig.7. System key location and display.
M14585
Fan
On
Auto
M14584
System
Heat
Off
Cool
Auto
Fig. 8. Fan key location and display.
NOTE:
Always press the keys with your fingertip or similar
blunt tool. Sharp instruments like a pen or pencil
point can damage the keyboard.
Emergency Heat
The Emergency Heat feature allows you to “turn on” the
electric heat section of the system by moving the system
switch to the Em. Ht. position. The LED lights (location shown
in Fig. 9) and the thermostat displays “Em. Ht.” when the
system calls for emergency heating.
Fig. 9. LED location.
The thermostat may also display “Aux. Ht.” if the system calls
for additional back-up heating. See Fig. 10.
When the heat pump requires servicing, the LED lights and
the system automatically activates emergency heat. After
contacting your service technician, clear the LED signal by
moving the system switch to Em. Ht. then back to Heat or
Auto.
Auxiliary Heat
The auxiliary heaters assist the heat pump under normal
conditions when low outdoor temperature occurs. The auxiliary
heaters may also operate while in the recovery mode to
maintain comfort level. The thermostat displays “Aux. Ht.” (see
Figure 10) when the auxiliary heating equipment operates.
Temperature Settings
Refer to Table 2 for the default program. For 7-Day and 24-
Hour Operation, the settings are the same for each day of
the week. Refer to the Owners Guide, Pub. No. 22-5128-02,
for instructions on changing the default settings.
Table 2. Default Program Settings.
M17150
LED INDICATOR
M14610
Aux Ht
System
Em Heat
Em Ht
FLAME DISPLAYS DURING CALL FOR HEAT
AUX HT DISPLAYS WHEN SYSTEM CALLS FOR
ADDITIONAL BACK-UP HEATING DURING NORMAL
CONDITIONS OR IN EMERGENCY HEAT MODE.
EM HT DISPLAYS
WHEN SYSTEM SWITCH
IS IN EMERGENCY
HEAT POSITION
EM HT DISPLAYS WHEN SYSTEM CALLS FOR
HEAT IN EMERGENCY HEAT MODE.
Period
Time
Heat
Setpoint
Cool
Setpoint
Fan
Setting
Wake
6:00 AM
70°F
(21°C)
78°F
(25.5°C)
Auto
Leave
8:00 AM
62°F
(16.5°C)
85°F
(29.5°C)
Auto
Return
5:00 PM
70°F
(21°C)
78°F
(25.5°C)
Auto
Sleep
10:00 PM
62°F
(16.5°C)
82°F
(28°C)
Auto
The Leave, Return and Sleep periods may be cleared. For
example, the daytime energy-savings period (from Leave to
Return) may not be used by the homeowner. To clear any
period, follow the instructions in the Owners Guide in the
Clearing Schedule Period section.
INSTALLER SETUP
The Installer Setup is used to customize the thermostat for
specific systems. Some of the options include Comfort-R™
control activation, Fahrenheit vs. Centigrade temperature
display, outdoor temperature display (requires outdoor
sensor installation), and system changeover. Installer Setup
numbers are listed in Table 3. The table includes all the
configuration options and the factory-settings for the
XT500C Deluxe Programmable Heat-Pump Thermostat .
NOTE:
For most applications, the thermostat factory-
settings apply. Review the factory settings in Table 2
and if no changes are necessary, go to the Installer
Self-Test section.
IMPORTANT
The chart Customizing Your Thermostat found in the
beginning of the Owners Guide (see Fig. 11) must
be completed. The homeowner identifies the options
you install by referring to this chart.
Fig. 10. Emergency and auxiliary heat display
OR Em. Ht. and Aux. Ht. display.
