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69-1055-1
3
T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS
Fig. 3. Typical hookup of T8524 in a multistage
heating and cooling system.
Fig. 4. Proper wiring technique.
Mounting Thermostat
1. Engage tabs at the top of the thermostat and
wallplate. See Fig. 5.
2. Press lower edge of case to close and latch.
M4826
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
W2
L1
(HOT)
L2
M11309
FAN
RELAY
Y1 G C
THERMOSTAT
RC
HEAT
RELAY
1
RW1
L1
(HOT)
L2
COMPRESSOR
CONTACTOR 1
Y2
COMPRESSOR
CONTACTOR 2
HEATING
TRANSFORMER
COOLING
TRANSFORMER
HEAT
RELAY
2
OT OTB
HEAT
DAMPER
OUTDOOR
SENSOR
COOL
DAMPER
O
2
2
3
3
3
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A
ONE TRANSFORMER SYSTEM.
CAN BE USED FOR CHANGEOVER VALVE ON HEAT
PUMP SYSTEMS.
1
1
Fig. 5. Mounting thermostat on wallplate.
NOTE: To remove the thermostat from the wall, first pull out
at the bottom of the thermostat; remove top last.
M6798A
B.
PRESS LOWER EDGE OF CASE TO LATCH.
A.
ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.
M6801
DISPLAY PRESENT
SETTINGS AND SCROLL
THROUGH INSTALLER
SETUP MODES
(INFORMATION KEY)
i
DECREASE
TEMPERATURE
SETTING
INCREASE
TEMPERATURE
SETTING
Using Thermostat Keys
The thermostat keys are used to:
• set temperature,
• display present setting,
• configure Installer Setup,
• check System Test,
• display outdoor temperature (select models).
T8524D has keys to:
• set the system operation,
• set the fan operation.
See Fig. 6 for key information.
Fig. 6. Thermostat key locations and descriptions.
SETTINGS
System and Fan Settings
System settings control the thermostat operation as
follows:
Heat: The thermostat controls the heating.
Off: Both the heating and cooling are off.
Cool: The thermostat controls the cooling.
Auto (T8524D only): The thermostat automatically
changes between heating and cooling operation,
depending on the indoor temperature.
Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Equipment controls fan.
The system default setting is Heat and the fan default
setting is Auto. Use the keyboard or system and fan
switches, depending on model, to change to the desired
settings. See Figs. 7 and 8.