Honeywell T8524, Данные о продукции, Страница: 12 / 16

T8524 DELUXE ELECTRONIC THERMOSTAT
68-0202
12
Minimum-Off Timing
A minimum-off timer assures that the cooling compressor or
heat pump compressor does not come on again for at least
five minutes after it turns off. The minimum-off timer is
triggered when the compressor goes off and when the
system switch is changed. If he compressor turns off when
the setpoint is changed, then the minimum-off timer is
triggered. The minimum-off timer operates during the first
stage of both heating and cooling on the heat pump
thermostat models and cooling only on the standard
application models.
Fan Control
The fan will be on when any of these conditions are present
(it can take up to 20 seconds for the fan to turn on).
Fan On: This setting means that the fan is energized
continuously.
Fan Auto: The Auto setting means the fan will run only
with the heating and cooling system.
Select models allow the installer the option of electric or
conventional heat fan operation in the installer setup. When
set for electric heat systems, the fan comes on at the same
time as the heat and is energized by the thermostat. The fan
is energized by the plenum switch when set for conventional
heating system.
Outdoor Temperature Sensor (select models)
The outdoor temperature sensor is used to display the
outdoor temperature. Pressing the Information
i
key once
will show the outdoor temperature if installer setup number 24
is set to 1.
W2
L1
(HOT)
L2
M11309
FAN
RELAY
Y1 G C
THERMOSTAT
RC
HEAT
RELAY
1
R W1
L1
(HOT)
L2
COMPRESSOR
CONTACTOR 1
Y2
COMPRESSOR
CONTACTOR 2
HEATING
TRANSFORMER
COOLING
TRANSFORMER
HEAT
RELAY
2
OT OT B
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
Symptom Possible Cause Action
Display will not come on. Thermostat is not being
powered. • Check that C terminal is connected to the system transformer.
• Check for 24 Vac between C and R or RH terminals.
—
If missing 24 Vac:
—
check if the circuit breaker is tripped—reset the
circuit breaker.
— check if the system fuse is blown—replace the fuse.
— check if the power switch on the HVAC equipment is
in the Off position—set to the On position.
— check wiring between thermostat and HVAC
equipment—replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
Temperature display is
incorrect. Room temperature
display has been
reconfigured. Enter Installer Setup number 37 and reconfigure the display.
Thermostat is
configured for °F or °C
display (select models). Enter Installer Setup number 14 and reconfigure the display.
Bad thermostat location. Relocate the thermostat.
(continued)
WIRING DIAGRAM (Fig. 14)
Fig. 14. Typical hookup in multistage
heating and cooling application.
TROUBLESHOOTING GUIDE