Honeywell T8400C - Mounting Decorator Cover Plate and Wallplate to Wall

T8400C ELECTRONIC THERMOSTAT
F TEMPERATUREDISPLAY
j
r _NCREASE
SETtiNG
DECREASE
SETtiNG
'_- FAN_Wb_CH
Fig. 8. Digital display and system
switches (FAN and SYSTEM).
Set Temperature Setpoint
NOTE: Temperature setpoint range is 40 ° to 99°F (5 to
37°C)
The temperature setpoJnt and the room temperature are
shown separately on the digital display. The • indicator
points to Set when the temperature setpoint is displayed
and to Room when the room temperature is displayed
To set temperature setpoJnt:
1, Select Heat or Cool by sliding the SYSTEM switch
in the _ower right corner of the thermostat to the
desired mode See Fig 8.
2, To display the temperature setpoint on the digital
display, press either the • or • key once. The
temperature setpoint is displayed for approxi-
mately five seconds as the indicator points to Set
and flashes.
M14680
3. To increase the temperature setpoint press the •
key Each press changes the setpoint one degree;
press and hold to change the setpoint several
degrees
M14681
4. To decrease the temperature setpoint press the •
key Each press changes the setpoint one degree;
press and hold to change the setpoint several
degrees
M14682
Setting °F!°C Indication and Heat Cycle Rate
NOTE: To save changes to the °F/°C indication and the
heat cycle rate, all seven steps must be com-
pleted
To set the °F/°C indication and heat cycle rate:
1. If the temperature is displayed in °E set the tem-
perature setpoint to 52°F If the room temperature
is displayed in °C, set the temperature setpoint to
11C
M14_3
OPTIONALSYSTEMCHECKOUT
When in steps 2 and 3 onlj4 the • key can be used to
turn heat or cool outputs on and off Change the
SYSTEM switch setting to test heat or cool outputs No
action takes place If the systet'n switch is in the Off
losiflon
Examples: System setting at HEAT: if heat is on. the •
key turns it off; if heat is off. • turns it on
System setting at COOL: If cool is on, • key
turns itoff; if cool is off, • turns it on
2. Press the &• keys simultaneously for more than
one second to light all segments on display and to
enter installer setup mode When the keys are
released, a two-digit software revision code is dis-
played.
M148_
NOTE: In installer setup mode only, each press of the
• key momentarily displays 01. Each press of
the • key momentarily displays 02 When the
keys are released, these two-digit codes are no
longer displayed.
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