INSTALLATION, OPERATION & APPLICATION GUIDE FOR DIGITAL WALL THERMOSTAT 9420*381 & 9420*382

WARNING!

This appliance is not intended for use by young children or infirm 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 national codes and ordinances.

[power-off] 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-resetting 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 continues to "open", the fault must be located and corrected.

The thermostat includes a mounting 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 Location

The thermostat can function in two ways regarding temperature sensing:

• An internal temperature sensor on the thermostat can act as the room sensor.
• Alternatively, a remote temperature sensor can be connected to the thermostat via the SENS connectors. When a remote sensor is used, the thermostat will display "REMOTE" at the top of the display. This setup allows the thermostat to be located conveniently within the coach, provided the user can still access it for operation.

The available Remote Room Sensors are model 8330-5191 (white) and 8330-3101 (black).

Installation

[warning-sign] ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat (if applicable).

A. Thermostat Location

The thermostat is a sensitive electronic instrument. For accurate temperature control and comfort, consider the following:

1. Locate the thermostat on an inside wall, approximately five feet above the floor. Choose a dry area with good air circulation.
2. Avoid installing the thermostat where there are unusual heating conditions, such as direct sunlight, proximity to heat-producing appliances (TV, radio, wall lamp, etc.), or near a furnace or air conditioner supply register.
3. The thermostat must be installed in a vertical position.

B. Installing the Thermostat

1. Place the thermostat mounting plate against the wall where the thermostat will be mounted, orienting it as shown. [arrow-up] indicates the upward direction.
2. Secure the mounting plate to the wall using two screws. Wall anchors are included if needed to ensure a secure fit.
3. Wire the thermostat to the motorcoach:
   • Refer to the "Wire Labeling and Connectors" section in this manual for wiring instructions.
   • Refer to the "Dip Switches" section in this manual to set the dip switches according to the equipment installed in the coach.
4. Place the thermostat onto the mounting plate and gently slide it down to lock it in place.
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 is found on the rear of the thermostat. The following table defines these labels:

¹ WHP Connection for Electric heat output is used for Heat Pump or the strip heat accessory for the A/C.

The thermostat connectors accept 20 AWG solid wire. To insert a wire, strip the wire to the appropriate length (5/16"). The strip gauge on the back of the thermostat can be used to check the stripped length. Press the stripped wire into the connector until initial resistance is overcome. Lightly tug the wire to ensure a solid connection.

To remove a wire, press down on the connector's tab with a screwdriver and pull the wire vertically. Minimal force is required.

If wires were previously inserted into a connector, it is recommended to use the same gauge wire or a larger diameter wire for that position. For thermostats equipped with plugs (9420-382): If wires are cut to remove plugs, they must be spliced (or terminated) following electrical code and good workmanship practices.

Dip Switches

Dip switches enable or disable specific thermostat functions. Any changes made to dip switches after initial installation require the device to be rebooted. Refer to the Manual Reboot section for instructions.

The table below describes the dip switch functions:

Dip switches are accessible from the rear of the thermostat when the back plate is detached. Switches are labeled according to their function.

NOTE: Dip Switches MUST be properly set for the installed equipment on the vehicle for the thermostat functions to work as intended.

HVAC Mode and Fan Mode Selection

Upon powering up, the thermostat displays 'Off' for HVAC mode and fan mode, the current temperature, and temperature units (default is Fahrenheit). It also indicates if a remote sensor is used.

To set the HVAC mode: Press the knob. The display will show the HVAC mode section with the currently selected mode blinking. Rotate the knob to scroll through options. Press the knob to accept the blinking setting.

If 'Off', 'Cool', or 'Cool+Heat' mode is selected, the fan mode will illuminate, showing the currently selected mode blinking. Rotate the knob to scroll through options. Press the knob to accept the blinking setting.

The display will then show the HVAC mode and state (if applicable), current temperature, temperature units, the sensor in use, the set point temperature (if not in 'Off' mode), and the fan mode and state (if applicable).

When the thermostat returns to this screen, it checks for any outputs that need to be enabled or disabled and performs those actions.

Operation

The thermostat features a screen with a black background and a white LCD display. A rotary knob is used for switching between selections and temperature settings, with a push-button feature to confirm desired settings.

[warning-sign] WARNING! This appliance is not intended for use by young children or infirm persons unless they have been adequately supervised by a responsible person to ensure they can use the appliance safely.

Thermostat Display

Remote Sensor Installed: Indicates when the thermostat is controlled by a remote sensor. If a remote sensor is used, the thermostat's internal sensor is inactive.

Current temperature: Displays the room temperature at the sensor's location (remote or thermostat, depending on sensor usage).

Temperature Units: Displays the temperature scale as Fahrenheit (°F) or Celsius (°C).

HVAC State: Shows the A/C or type of Heat currently operating.

Set point Adjustment: To adjust the set point, the thermostat must be in an HVAC mode other than 'Off'. Once an HVAC mode is selected and the set point temperature is visible, rotate the knob. The set point temperature will blink, allowing adjustment via rotation (clockwise for increase, counterclockwise for decrease). Press the knob to accept any changes.

HVAC Mode: Displays the HVAC operation mode selected by the user.

Fan State: Indicates when the fan is operating.

Fan Mode: Displays the user-selected fan speed.

Knob Operation: Rotate the knob clockwise to increase temperature settings and counterclockwise to decrease them. Other settings are not displayed during temperature selection. Press the knob to accept changes.

Once the desired set point is displayed, press the knob. The display will revert to previous information with the new set point. The thermostat will then energize the necessary appliance to meet the new settings.

Temperature Unit Change

The thermostat can display temperature in Fahrenheit or Celsius. To change units, press and hold the knob for approximately 4 seconds. The display will show the current temperature, set point temperature (if previously displayed), and temperature unit options, with the selected unit blinking. Rotate the knob to change the selection. Upon selection, the displayed temperatures update accordingly. Press the knob to accept the blinking units.

Retained Settings

Certain settings are retained even if power is lost or the thermostat is rebooted. These include:

• Set points: Three set points are retained: one for cool, one for heat (electric and gas), and one for cool+heat.
• Temperature units.

Settings are automatically stored upon any changes to set points or temperature units.

HVAC Mode Descriptions

The table below describes the live outputs for each HVAC mode:

In Cool+Heat mode, a 15-minute auto change-over timer prevents the opposite HVAC mode from operating if the set temperature and room temperature are within 2°F. This timer is automatically disabled if the HVAC mode, fan mode, or set point temperature is changed.

Elec Heating Mode

When using electric heating (heat pump) mode, specific rules apply. If electric heat is selected and the current temperature drops 5°F below the set point, gas heat will activate alongside electric heat. When gas heat assists electric heat, electric heat receives a "strike." After accumulating three strikes and completing a heating cycle, electric heat is disabled for 1 hour and 45 minutes, with gas heat becoming the primary heat source. After this period, electric heat resumes as the primary source. If electric heat completes a cycle without gas heat assistance, it loses a strike. If electric heat runs for 20 minutes without gas heat intervention, the strike counter resets. The 'Elec' segment on the display will flash whenever gas heat is running in this mode.

Compressor/Elec Heat Short Cycle Protection (DOB)

To prevent compressors and heat pumps from short cycling, a 3-minute delay is initiated for both compressor and electric heat outputs after their demand is satisfied. During this delay, if there's a demand for either, the HVAC state segment will blink according to the selected mode. Normal operation resumes once the delay expires.

Sleep Mode

Sleep mode activates automatically 10 seconds after the last user interaction. In this mode, the LCD dims, and power usage decreases. The first user interaction (rotating the knob, pressing the knob, or holding the knob for 4 seconds) will wake the device and brighten the display.

Auto Accept

If a user is changing a setting (HVAC mode, fan mode, set point, or temperature units) and does not press the knob to accept the selection, the thermostat will automatically accept the current selection after 7 seconds and apply any changes.

Manual Reboot

The thermostat can be manually rebooted by pressing and holding the knob for 12 seconds. After 4 seconds of holding the knob, the thermostat enters the units selection screen. After another 4 seconds, a countdown begins. When the countdown reaches zero and the display turns off, release the knob to initiate the reboot.

Set Temperature Range

The following table outlines the temperature ranges for setting cooling and heating points:

If the current temperature is below 33°F (0°C), the display will show "LO". If the temperature is above 99°F (37°C), the display will show "HI".

Contact Information

AIRXCEL, INC. – RV Products Division

PO Box 4020 • Wichita, KS 67204 • 574.247.9235 • www.AIRXCEL.com

Email Support: www.RVPSupport@airxcel.com • Email Sales: RVPSales@airxcel.com

Coleman is a registered trademark of The Coleman Company, Inc. used under license. Mach is a registered trademark.