Setting - Honeywell T8141A Manual

T8141A ELECTRONIC HEAT PUMP THERMOSTATS
THERMOSTAT
LOGIC
TEMPERATURE
SENSOR
POWER
SUPPLY
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2 INTERNAL SYSTEM SWITCHES ARE DESIGNATED AS:
E-EM. HEAT, H-HEAT, O-OFF, C-COOL.

SETTING

IMPORTANT
Make sure that all wiring connections are secure
before beginning checkout.
The setpoint temperature is 45°F to 90°F (7°C to 32°C) for
heating and 60°F to 95°F (16°C to 35°C) for cooling. The
system retains the setpoint during a power outage.
Temperature Setting
Move the temperature control dial to the desired
temperatures for heating and for cooling. See Fig. 7.
System and Fan Switching
System switch positions control thermostat operation as
follows:
OFF: Heating and cooling are off. If the fan switch is in the
AUTO position, the cooling fan is also off.
HEAT or GEO HEAT: Heating system is controlled by the
thermostat. Cooling system is off.
COOL or GEO COOL: Cooling system is controlled by the
thermostat. Heating system is off.
EM. HEAT: Emergency heat relay is energized on call for
heat. Cooling system is off.
68-0169—1
ON
AUTO
FAN/COMPRESSOR/
HEAT RELAY
O
A
EM. HEAT
HEAT
OFF
COOL
E
H
O
C
AUX. HEAT
RELAY
E
H
O
C
E
H
O
C
E
H
O
C
INTERNAL FAN SWITCHES ARE DESIGNATED AS:
3
O-ON, A-AUTO.
4 ON SOME MODELS E/X TERMINAL IS LABELED E OR X
AND C/B TERMINAL IS LABELED B.
Fig. 6. Cool changeover hookup.
Fan switch positions control fan operation as follows:
ON: Fan operates continuously.
AUTO: Fan operates with heating and cooling equipment
To switch positions, use your thumb and index finger to slide
the lever to the desired position. For proper circuit operation,
set the switch at the desired function indicator mark.
6
R
FAN
SWITCH
FAN RELAY
3
G
2
SYSTEM
SWITCH
4
E/X
(E) (X)
COMPRESSOR
RELAY
Y
W
COOL CHANGEOVER
VALVE
O
AUX. HEAT
EM. HEAT
(GREEN)
(RED)
4
C/B
(B)
as controlled by the thermostat.
SYSTEM LEDs
SWITCH
EM. AUX.
HEAT
HEAT
SYSTEM
EM. HEAT
HEAT
90
OFF
COOL
80
70
60
FAN
50
ON
AUTO
FAN
CONTROL
SWITCH
DIAL
Fig. 7. Thermostat features.
TRANSFORMER
L1
(HOT)
L2
1
EM. HEAT RELAY
AUX. HEAT RELAY
M7776A
TEMPERATURE
SETPOINT FOR HEATING
AND COOLING
68
HEAT
73
COOL
M8387