DANGER:
When adjusting the jumpers on the upper unit control board be sure the line Voltage,
(115 VAC) and the control Voltage, (12 VDC) are disconnected from the board. Failure to
do this could result in injury or death.
Each zone must be controlled by an upper unit control board. When installed, this board is located in
the return air plenum of the air conditioner (see installation instructions for the air conditioner control
box). When installing the system, the upper unit control board must have two jumpers installed to
operate properly. First of all, the zone jumper must be set 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 jumper must be across the two jumpers labeled 1 and so
on for each zone (see drawing below). The second jumper that must be installed is the HP/NON-HP
jumper (see drawing below). This tells the system whether the unit being controlled is a heat pump or
not. If the unit being controlled is a heat pump, the jumper must be between the center post and the
one closest to the HP. Likewise if the unit being controlled is not a heat pump, then the jumper must
be between the center post and the one closest to NON-HP. For further explanation, see installation
instructions for the control box.
The green LED lights when there is adequate control voltage, (12 VDC) at the board. The green LED
will initially flash the number of times corresponding to the zone jumper setting. The green LED will
stop flashing when communication with the thermostat is established.
For further explanation, see troubleshooting section of manual.
Setting the Upper Control Board
CAUTION:
All zones boards must be wired and should have 12 VDC at each one before
programming can be done. The system only needs to be programmed once. The
programmer must know what appliances are installed in each zone before proceeding
with programming. If the system is programmed incorrectly the user will not be able to
operate some of the climate control appliances that are installed.
To program each zone for the type of heating and cooling installed, follow the sequence outlined
below.
Place the slide switch in the “
OFF
” position.
Put the thermostat in the programming mode by holding down simultaneously the up and down push
buttons (that are located to the right of the LCD) until words start flashing on the LCD, which should
be about 5 seconds.
Press the “
ZONE
” button until zone 1 is displayed on the LCD.
Press the “
MODE
” button until the correct setup is shown for that zone.
When in the programming mode, the following sequence of options will be toggled through in this
sequence:
Programming the Thermostat
Down
button
Up
button
Toggle through all options, then stop at the desired one. Once the correct setup is selected for zone
1, press the
ZONE
button and repeat the process for each zone that is connected to the system. After
the correct settings are selected for each zone that is hooked up, move the slide switch momentarily
to either
HEAT
or
COOL
and then back to
OFF
. This will exit the programming mode and the setup
will be stored in memory indefinitely. Replace the thermostat cover.
Note:
If two or more upper unit control boards have been set to the same zone, the units will operate
the same as one another.
If these applications
are connected:
Then thermostat LCD display that
should be selected is:
A/C
Cool
A/C
Gas Heater
Cool
Gas
Heat
Gas Heater
Gas
Heat
A/C
Gas Heater
HP or Strip Heat
Cool
Gas
Heat
Elec
A/C
HP or Strip Heat
Cool
Heat
Elec
Once temperature settings have been set for each zone in heating and cooling, the thermostat
memory will retain these settings during seasonal changovers and times of no electrical power.
A connection for an “Auto Generator Start” appliance is included on the upper unit control board that
is mounted in the return air of the air conditioner or heat pump. This calls for the generator to run
when calling for the compressor for cooling or heating, or when calling for strip heat. Note that the
generator will not be called for fan only operation or for gas heat operation.
The thermostat wiring is factory installed by the OEM (original equipment manufacturer). The
thermostat connects to the upper unit(s) with a 9-pin plug, (see system wiring diagram). The OEM
must supply the 12 VDC wiring and the heating appliance control wiring which connects to the 9-pin
plug on the thermostat. RV Products suggests the thermostat wiring be a minimum of 18 gauge.
Zone arrangement should be set with the front of the vehicle as zone 1 and progress toward the rear
of the coach.
The OEM installed the upper control boxes for the zone system at the factory and programmed the
thermostat for the system that is installed in this motor coach. Before programming the thermostat, it
is imperative that the programmer knows the types of appliances that have been installed in the motor
coach in each zone.
The heating appliance control circuit must not exceed 1 Amp.
Fuse
The thermostat is equipped with a replaceable fast acting 2-Amp fuse located on the base of the
thermostat. The fuse is designed to “open” if the appliance is mis-wired or there is a short in the
system. If the fuse opens, the cause of the failure must be located and corrected before the fuse is
replaced.
Control Box
The control box mounted in the return air plenum has an opening that allows viewing of the green
LED on the control board. The green LED, when lighted, indicates that the control voltage is adequate
to run the system. When the LED is not lighted, there is a problem with the 12 Volt DC control voltage
and it must be serviced by a trained technician.
General
LIAF068-1
RV Products
A Division of Airxcel, Inc.
P.O. Box 4020, Wichita, KS 67204
Web:
www.rvcomfort.com
1976B337 (04-08)
This system is designed to work one of two ways. A built-in temperature sensor on the thermostat
can control zone 1. In this case the thermostat must be located in zone 1. On the other hand, a
remote temperature sensor can be connected to zone 1. This situation would allow the thermostat to
be located virtually anywhere in the coach as long as the user can get to it to operate it. Every zone
other than zone 1 must always have a remote temperature sensor to control the system.
This thermostat is a sensitive instrument. For accurate temperature control and comfort, the following
considerations should be taken into account when locating both remote sensors and the thermostat if
the thermostat is to be used as the zone 1 temperature sensor.
1. Locate on an inside wall about five feet above the floor. Pick a dry area where air circulation is
good, but not in line with exterior doors.
2. Do not install where there are unusual heating conditions; Such as direct sunlight, heat producing
appliances (television, radio, wall lamps, etc.) or a furnace/air conditioner supply air register.
Thermostat and Room Temperature Sensor Location
Attaching the Wall Thermostat and Room Temperature Sensors
1. Attach the external room sensor to the wall using (2) #6 x 3/4 screws.
2. The external room sensor is wired to the two terminals marked “ROOM” on the control box low
voltage strip.
3. Separate the thermostat cover from the base by gently pulling on the left and right sides.
4. Connect motor coach wiring harness to thermostat wire plug lead.
5. Attach the new thermostat base to the wall at the desired mounting location using (2) #6 x 3/4
screws.
6. Move the Fahrenheit/Celsius jumper to the desired setting. The jumper is
preset at the factory to Fahrenheit. To change simply pull the jumper and
connect it between the center post and either the left post for Fahrenheit or
the right post for Celsius. See drawing to the right.
7. Re-attach thermostat cover to thermostat after fastening thermostat to wall.
Troubleshooting
Symptom
Remedy
No display on LCD
No power to thermostat (Remove ceiling assembly grille and look in round opening of control box for green LED light. Light not displayed, there
is no power to control box). Fuse on thermostat may have opened.
Heat or Cool displays on thermostat, but can’t modify settings
Appliances may not be installed on this coach, check homeowners packet
“Er” displaying on thermostat
Current temperature may be outside display range of thermostat
Extenal room sensor circuit may be disrupted. Contact service technician.
Temperature does not change on thermostat when unit is running
Current temperature may be outside display range of thermostat (thermostat designed to show 41°F-103°F)
Appliances not responding to thermostat setting changes
Zone or appliance settings on upper control boards may not be correct for zones or appliances installed
Built-in delay for communication signal
Setpoint cannot be adjusted
Check setting of thermostat (Setpoint cannot be adjusted when slide switch is set to OFF, Cool or HEAT mode is set to OFF, the zone is turned
OFF, or FAN is set to run HIGH or LOW continuously
GAS flashing on LCD display
Backup heat source is energized to supplement primary heat
Backup heat source running with Heat Pump idle
Heat pump is unable to keep up with heating demand, system locks out heat pump for 2 hours and backup heat becomes primary heat source
for those 2 hours
Two or more units have identical operation
Upper unit control boards may be set to same zone. Have service technician check.
Unit not responding
Communication signal lost to that zone (Signal wire might have vibrated loose). The system locks out operation below 9.75 VDC.
System Wiring Diagram
