Mounting Thermostat; Using Thermostat Keys; System And Fan Settings - Honeywell DMULTISTAGE T8524C Installation Instructions Manual

THERMOSTAT
RC Y1 G O
2
FAN
COMPRESSOR
RELAY
CONTACTOR 2
COOL
COMPRESSOR
DAMPER
CONTACTOR 1
3
L1
(HOT)
L2
1
COOLING
TRANSFORMER
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2 JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A
ONE TRANSFORMER SYSTEM.
3 CAN BE USED FOR CHANGEOVER VALVE ON HEAT
PUMP SYSTEMS.
Fig. 3. Typical hookup of T8524 in a multistage
heating and cooling system.
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
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.

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.
T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS
Y2 C B W2 W1 R OT
HEAT
RELAY
2
HEAT
HEAT
DAMPER RELAY
1
3
HEATING
TRANSFORMER
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
M4826
A.
ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.
OT
OUTDOOR
SENSOR
1
L1
(HOT)
L2
M11309
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.
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.
3
B.
PRESS LOWER EDGE OF CASE TO LATCH.
i
M6798A
INCREASE
TEMPERATURE
SETTING
DECREASE
TEMPERATURE
SETTING
DISPLAY PRESENT
SETTINGS AND SCROLL
THROUGH INSTALLER
SETUP MODES
(INFORMATION KEY)
M6801
69-1055-1