Checkout; Heating; Cooling; Fan - Honeywell CHRONOTHERM T8621A User Manual

Fig. 17—Mounting thermostat on subbase.

HEATING

Move the system switch to HEAT and the fan switch to
AUTO. Press WARMER key until the setting is about 10
F [6 C] above room temperature. Heating should start
(both stages if multistage), and the fan should run (may be
a short delay on forced air systems). Press cooler key until
the setting is about 10 F [6 C] below room temperature.
The heating equipment should shut off, followed by the

fan.

NOTE: On an AUTO changeover thermostat, the cooling
temperature must be set at least 3 F [2 C] above the
heating temperature, or display will flash.

COOLING

!
CAUTION
Do not operate cooling if outdoor temperature is
below 50 F [10 C]. Refer to manufacturer's
recommendations.
A.
C.
TEMPERATURE
RUN PRESENT
PROGRAM SETTING
TIME
SET
COPY
PRESENT
DAY PERIOD FROM AHEAD WARMER
DAY/TIME
HOLD SET CANCEL BACK
COPY COOLER
TEMP HEAT/COOL PERIOD
TO
17
SYSTEM
SKIP
NEXT
PERIOD
CHANGE
TO LAST
PERIOD
NOTE: When cooling setting is changed, thermostat will
wait up to five minutes before turning on the cooling
equipment. This delay is to protect the compressor.
Move the system switch to COOL and the fan
switch to AUTO. Press COOLER key until the setting
is about 10 F [6 C] Below room temperature. The
cooling equipment and fan should start (both stages if
multistage). Press WARMER key until the setting is
about 10 F [6 C] above room temperature. The
cooling equipment and fan should stop.
NOTE: On an AUTO changeover thermostat, the heating
temperature must be set at least 3 F [2 C] below the
cooling temperature, or display will flash.
FAN
Move the system switch to OFF, and the fan switch to
ON. The fan should run continuously. When the fan switch
is in the AUTO position, fan operates directly with the
thermostat call for cooling and also with the thermostat
call for heating.
T8621A,C,D
INSTALLATION • CHECKOUT
B.
SYSTEM
PM
MON ROOM
MORNIMG HEAT ON
M 843

Checkout

68-0058—1