Application Guide

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according to which zone the board is to control. We recommend starting at the front of the coach as Zone 1
and progressing towards the rear.
• If the board is to control Zone 1, then the Zone Assignment Switches should be set to 1) OFF & 2) OFF.
• If the board is to control Zone 2, then the Zone Assignment Switches should be set to 1) On & 2) OFF.
• If the board is to control Zone 3, then the Zone Assignment Switches should be set to 1) OFF & 2) ON.
• If the board is to control Zone 4, then the Zone Assignment Switches should be set to 1) ON & 2) ON.
Setting the MaxxFan PC Board
Each zone must be controlled by the MAXXFan PC Board. This board is located above the MAXXFan control
plate. When installing the system, the MAXXFan PC Board must be set according to which zone the
MAXXFan is to control.
• If the MAXXFan is located in Zone 1, then the Zone Assignment Switches should be set to 1) OFF & 2)
OFF.
• If the MAXXFan is located in Zone 2, then the Zone Assignment Switches should be set to 1) ON & 2)
OFF.
• If the MAXXFan is located in Zone 3, then the Zone Assignment Switches should be set to 1) OFF & 2)
ON.
• If the MAXXFan is located in Zone 4, then the Zone Assignment Switches should be set to 1) ON & 2)
ON.
OPERATION
The LCD display screen is the main interface between the user and the thermostat. This will display which
zone the user is looking at. When the system is first powered up, the thermostat determines how many
zones are connected to the system and only displays the zones detected.
The LCD also displays the mode that the particular zone is currently in. These will range from Cool Auto, Cool
High, Cool Low, Fan High, Cool Low, Fan High, Fan Low and Off in cooling, and from Gas Heat, Heat Elec
(heat pump or electric strip heat) and Off in heating.
Also, the LCD displays the room temperature and setpoint temperature in the displayed zone. If the word
Set is displayed, then the setpoint or desired temperature is shown. If the word Set is not displayed, then
the temperature displayed is the actual room temperature in the displayed zone.
Note: The thermostat is designed to display temperatures from 33 to 124 (or 41 to 103 with remote sensor)
however it will operate from -40 to +175. If the temperature is between -40 and -41, then 41 will be
displayed as the room temperature. Also, if the room temperature is between 124 to 175, then 124
will be displayed. When temperature extremes fall outside the operating limits of the thermostat, “Er”
will display in the temperature of the LCD to show that the current ambient temperature has exceeded
the thermostat capabilities. Additionally, if there is a problem with one of the remote temperature
sensors, “Er” will display on the thermostat.