Coleman 9420-381 Digital Wall Thermostat Instruction Manual
Temperature Unit Change
While in cool+heat mode, a 15 minute ꢀmer
(auto change-over ꢀmer) will prevent the
opposite HVAC mode from operaꢀng if the
set temperature and room temperature
remain within 2° F. This ꢀmer is automaꢀcally
disabled upon changing the HVAC mode, fan
mode, or set point temperature.
The thermostat can display temperature in
either Fahrenheit or Celsius. To change the
temperature units, press and hold the knob
unꢀl the display changes (4 seconds). The
display will show the current temperature,
the set point temperature (if it was previously
displayed), and the temperature units opꢀons
with the currently selected units blinking.
Rotate the knob to change the selecꢀon.
Upon selecꢀng units, the temperature(s)
displayed will update values accordingly.
Once the desired units are blinking, press the
knob to accept the changes.
Elec Heaꢀng Mode
When in elec heaꢀng (heat pump) mode
some extra rules are applied. If the elec
heaꢀng mode is selected and the current
temperature ever reaches 5° F below the set
point temperature, the gas heat mode will
turn on in conjuncꢀon with the elec heat.
When the gas heat must turn on to assist the
elec heat, the elec heat gets a strike. Once the
elec heat gets three strikes and that heaꢀng
cycle has completed, it is disabled for 1hr and
45 minutes. When the elec heat is disabled in
this way, the gas heat becomes the primary
source of heat. Aſter 1 hr and 45 minutes, the
elec heat becomes the primary source again.
If the elec heat gets a strike but completes a
heaꢀng cycle without the assistance of the
gas heat, the elec heat will lose a strike. If the
elec heat is running for 20 minutes without
the gas heat needing to turn on, the strike
counter is reset. Whenever the gas heat is
running in this mode, the ‘Elec’ segment will
flash.
Retained Seꢁngs
Some seꢁngs will be retained when power is
lost, or the thermostat is rebooted.
The retained seꢁngs include:
•
set points - Three set points are
retained: one for cool, one for heat,
elec (electric) heat and gas heat and
one for cool+heat.
•
temperature units.
Seꢁngs are stored automaꢀcally upon any
changes made to any set point or
temperature unit change.
HVAC Mode Descripꢀons
The table below describes which outputs are
live by the thermostat in the specified HVAC
mode.
Compressor/Elec Heat Short Cycle Protecꢀon
(DOB)
HVAC
To protect the compressor/heat pump from
short cycling, a 3 minute delay will be
iniꢀated for both the compressor and elec
heat outputs aſter either output’s demand is
saꢀsfied. During this 3 minute delay, if there
is a demand for the compressor or elec heat,
the HVAC state segment will blink according
to the selected mode. Once the delay has
expired, the thermostat will resume normal
operaꢀon.
Live Outputs
Mode
HVAC outputs are disabled,
fan is based on selecꢀon
Off
Compressor and selected
fan speed
Electric heat and gas heat
Cool
Elec Heat
Gas Heat
Heat
Gas Heat
Cooling Cycle: Compressor
and selected fan speed
Heaꢀng Cycle: Electric heat
(when Dip switch 2 is on),
gas heat and Fan
Cool+Heat
| General | Details |
|---|---|
| Name | Coleman 9420-381 Digital Wall Thermostat Instruction Manual |
| Make | Coleman |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.19 MB |
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