Airxcel Coleman-Mach 9420 381 User manual

INSTALLATION, OPERATION & APPLICATION GUIDE FOR DIGITAL WALL
THERMOSTAT 9420*381 & 9420*382
WARNING!
This appliance is not intended for use by
young children or inrm persons unless they
have been adequately supervised by a
responsible person to ensure they can use the
appliance safely.
CAUTION!
This thermostat should be installed by trained
technicians only. Adhere to all local and
naonal codes and ordinances.
DISCONNECT ALL POWER TO THE SYSTEM
BEFORE INSTALLING, REMOVING, OR
CLEANING.
Features
The thermostat wiring is factory installed
by the OEM (Original Equipment
Manufacturer). RV Products suggests the
thermostat wiring be a minimum of 20
gauge. The thermostat is intended for use
with a 12 VDC control circuit that does not
exceed 2 amps.
The thermostat is equipped with a self-
reseng PTC fuse located in the
thermostat. The fuse is designed to “open”
if the circuit is mis-wired or if there is a
short in the system.
If the PTC fuse connues to “open”, the
fault must be located and corrected.
The thermostat includes a mounng plate,
2 screws and 2 wall anchors.
An oversized accessory wall plate
(9420*3501) is available for purchase if
needed.
Thermostat and Room Temperature
Sensor Locaon
•An internal temperature sensor on the
thermostat can act as the room sensor.
•Alternavely, a remote temperature
sensor can be connected to the
thermostat to the SENS connectors. The
thermostat will show “REMOTE” at the
top of the display. This situaon would
allow the thermostat to be located
virtually anywhere in the coach, as long
as the user can access the thermostat to
operate it.
The Remote Room Sensors available are
8330-5191 (white) and 8330-3101
(black).
1980R189 (08-24-23)

Installaon
ELECTRICAL SHOCK HAZARD – Turn o power
at the main service panel by removing the
fuse or switching the appropriate circuit
breaker to the OFF posion before removing
the exisng thermostat (if applicable).
A. Thermostat Locaon
The thermostat is a sensive electronic
instrument. For accurate temperature control
and comfort, the following should be
considered:
1. Locate the thermostat on an inside wall
about ve feet above the oor. Pick a dry
area where the air circulaon is good.
2. Do not install the thermostat where
there are unusual heang condions
such as direct sunlight, near heat
producing appliances (TV, radio , wall
lamp, etc.), or a furnace or air
condioner supply register.
3. The Thermostat must be installed in a
vercal posion.
B. Installing the Thermostat
1. Place the thermostat mounng plate
against the wall where the thermostat
will be mounted orienng it as shown
below.
2. Ax the mounng plate to the wall
using two screws. Wall anchors are
included if needed to secure the
mounng plate to the wall.
3. Wire the thermostat to the
motorcoach:
Refer to the secon “Wire Labeling
and Connectors” secon in this
manual for wiring the thermostat.
Refer to the secon “Dip Switches”
secon in this manual to set the dip
switches to the appropriate sengs
for the equipment installed on the
coach.
4. Place the thermostat on the mounng
plate and gently slide the thermostat
down to lock the thermostat onto the
mounng plate.
5. Turn on the power to the thermostat.
REFER TO THE OPERATION GUIDE FOR
THERMOSTAT DISPLAY INFORMATION &
THERMOSTAT OPERATION

Wire Labeling and Connectors
The labeling of the inputs/outputs of the
thermostat can be found on the rear of the
thermostat.
Refer to the table below for labels and denions.
Label on
Thermostat
Denion
R
Voltage input (+12V)
B
Ground
Y
Compressor output
GH
Fan high output
GL
Fan low output
W
Gas heat output
WHP
Elec heat output1
SENS
External sensor input
1 WHP Connecon for Electric heat output is used
for Heat Pump or the strip heat accessory for the
A/C.
The connectors of the thermostat can accept 20
AWG solid wire. To insert a wire, strip the wire to
the appropriate length (5/16”). The stripped length
can be checked by using the strip gage on the back
of the thermostat. Press the stripped wire into the
connector unl the inial resistance is overcome.
Lightly tug on the wire to ensure the connecon is
solid.
To remove a wire, press down on the connector’s
tab with a screwdriver and pull wire vercally. It
won't take much force to pull the wire to remove it.
If the thermostat had wires previously inserted into
one of the connectors, it is recommended to use
the same gauge wire in that posion or a larger
(diameter) gauge wire.
Thermostats equipped with plugs (9420-382):
Reference illustraon below for connectors.
If the wires are cut to remove the plugs, the wires must be spliced (or terminated) following the electrical
code and using good workmanship pracces.

Dip Switches
The dip switches will enable/disable certain
funcons of the thermostat. To apply any
changes to the dip switches aer inial
installaon, the device must be rebooted.
Refer to the Manual Reboot secon for
instrucons.
Refer to the table below for the dip switch
descripons.
Dip
Switch
Label
Funcon
1
No Label
Future use
2
Gas
(Factory
Default)
Disables Electric heat
mode (gas heat only)
Elec
Enables Electric and
gas heang mode
3
Cool+ Heat
(Factory
Default)
Enables cool and
heat modes
(Auto Changeover)
Cool Only
Enables cool mode
and disables all
heang modes
The dip switches can be accessed from the
rear of the thermostat when the back plate is
not aached. The dip switches are labeled
according to their funcon.
NOTE: Dip Switches MUST be properly set for
the equipment installed on the vehicle for the
thermostat funcons to work as intended.
HVAC Mode and Fan Mode Selecon
Upon powering up the thermostat, the
display will show the HVAC mode set to ‘O’,
the fan mode set to ‘O’, the current
temperature, temperature units (default is
set to F for Fahrenheit) and remote sensor, if
used.
To set the HVAC mode - press the knob, the
display will now show the HVAC mode secon
with the currently selected mode blinking.
Rotate the knob to scroll through the opons.
When the desired seng is blinking, press the
knob to accept.
If o, cool, or cool+heat mode was selected,
the fan mode will illuminate with the
currently selected mode blinking. Rotate the
knob to scroll through the opons. When the
desired seng is blinking, press the knob to
accept.
The display will now show HVAC mode and
state (if applicable), the current temperature,
temperature units, the sensor in use, the set
point temperature (when in an HVAC mode
other than o), and the fan mode and state (if
applicable).
When the thermostat returns to this screen, it
will check to see if any outputs need to be
enabled or disabled and performs those
acons.

OPERATION GUIDE FOR DIGITAL WALL
THERMOSTAT 9420*381 & 9420*382
Operaon
The thermostat screen has a black background with a white LCD display. A rotary knob (to
switch between selecons and temperature sengs) with a push buon feature to select
desired seng.
WARNING!
This appliance is not intended for use by young children or inrm persons unless they have been
adequately supervised by a responsible person to ensure they can use the appliance safely.

Thermostat Display
Remote Sensor Installed –
Remote displays when the thermostat is
controlled by a sensor remote to the
thermostat. In this example, a remote
sensor is used therefore the thermostat
isn’t used as the temperature sensor.
Current temperature –
Room temperature where the Sensor is
located, remote or at the thermostat
locaon depending on the method of
sensor used.
Temperature Units –
Temperature Scale F or C
HVAC State –
Displays the A/C or type of Heat
currently operang.
HVAC Mode –
Displays the mode of HVAC operaon
user selected.
Fan State –
Displays when the fan is operang.
Fan Mode –
Displays the user selected fan speed.
Knob –
Rotate Knob clockwise to increase
temperature seng and counter-
clockwise to decrease temperature
seng. (All other sengs will not be
displayed during temperature selecon.)
Press Knob to accept any changes.
Set point Adjustment
To select a set point, the thermostat must be
in any HVAC mode other than ‘O’. Once an
HVAC mode has been selected and the set
point temperature is visible, rotate the knob.
The display will now blink the set point
temperature and adjust it according to the
rotaon direcon (clockwise for increase and
counterclockwise for decrease of the set
point).
When the desired set point is displayed, press
the knob. The display will revert to the
previously displayed informaon with the
new set point.
Once the thermostat returns to this screen, it
will energize the needed appliance to sasfy
the new sengs.

Temperature Unit Change
The thermostat can display temperature in
either Fahrenheit or Celsius. To change the
temperature units, press and hold the knob
unl 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 opons
with the currently selected units blinking.
Rotate the knob to change the selecon.
Upon selecng units, the temperature(s)
displayed will update values accordingly.
Once the desired units are blinking, press the
knob to accept the changes.
Retained Sengs
Some sengs will be retained when power is
lost, or the thermostat is rebooted.
The retained sengs 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.
Sengs are stored automacally upon any
changes made to any set point or
temperature unit change.
HVAC Mode Descripons
The table below describes which outputs are
live by the thermostat in the specied HVAC
mode.
HVAC
Mode
Live Outputs
O
HVAC outputs are disabled,
fan is based on selecon
Cool
Compressor and selected
fan speed
Elec Heat
Electric heat and gas heat
Gas Heat
Gas Heat
Heat
Cool+Heat
Cooling Cycle: Compressor
and selected fan speed
Heang Cycle: Electric heat
(when Dip switch 2 is on),
gas heat and Fan
While in cool+heat mode, a 15 minute mer
(auto change-over mer) will prevent the
opposite HVAC mode from operang if the
set temperature and room temperature
remain within 2° F. This mer is automacally
disabled upon changing the HVAC mode, fan
mode, or set point temperature.
Elec Heang Mode
When in elec heang (heat pump) mode
some extra rules are applied. If the elec
heang mode is selected and the current
temperature ever reaches 5° F below the set
point temperature, the gas heat mode will
turn on in conjuncon 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 heang
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. Aer 1 hr and 45 minutes, the
elec heat becomes the primary source again.
If the elec heat gets a strike but completes a
heang 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
ash.
Compressor/Elec Heat Short Cycle Protecon
(DOB)
To protect the compressor/heat pump from
short cycling, a 3 minute delay will be
iniated for both the compressor and elec
heat outputs aer either output’s demand is
sased. 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
operaon.

Sleep Mode
Sleep mode is acvated automacally 10
seconds aer the last user interacon. In
sleep mode the LCD will dim, and power
usage will drop. The rst user interacon
(rotaon, knob press, or knob hold for 4
seconds) will wake up the device and brighten
the display.
Auto Accept
If the user was changing any seng (HVAC
mode, fan mode, set point, or temperature
units) and the knob was not pressed to accept
the current selecon, the thermostat will
auto accept the current selecon aer 7
seconds and apply any changes.
Manual Reboot
The thermostat can be manually rebooted by
pressing and holding the knob for 12 seconds.
When the knob is held for 4 seconds, the
thermostat will go to the units selecon
screen, aer another 4 seconds, the
thermostat will begin a count down. Once the
countdown reaches 0 and the display turns
o, the device will wait for the knob to be
released. Upon the release of the knob, the
device reboots.
Set Temperature Range
Temperature
Mode
Range
°F
°C
Cooling (set)
33° F to 99°
F
1° C to 37°
C
Heang (set)
33° F to 99°
F
1° C to 37°
C
If the current temperature is below 33° F (0°
C), the display will show “LO” and if the
temperature is above 99° F (37° C), the
display will show “HI”.
AIRXCEL, INC. – RV Products Division
PO Box 4020 • Wichita, KS 67204 • 574.247.9235 • www.AIRXCEL.com
Email Support: [e-mail] • Email Sales: R[email protected]om
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