Lcd Sz System Low Voltage Wire Connections; Upgrading From Bi-Metal Thermostat To Sz Lcd Thermostat - Dometic 57908.321 Installation Instructions Manual

INSTALLATION INSTRUCTIONS
FIG. 17
Freeze Control
Sensor
Remove
Hang Tag
Models May Vary
In Appearance
j. Attach electronic control box to the ceiling
template using the two (2) blunt self-tapping
screws provided in the electronic control box
kit. See (FIG. 18).
FIG. 18
Front
6 Pin Plug
From Unit
Control
Low Voltage
Wires
Wiring From
(Connected
Control Box
To T-Stat)
Route Up Through
Return Air Opening
Blunt Self-
Tapping Screw
Electronic
Control Box
120VAC
Power
Supply
From RV
Freeze Sensor
Wire Harness
I. LCD SZ System Low Voltage Wire
Connections
1.  A ll Heat Pump Electronic Control Kit Systems
a. Plug the outdoor temperature sensor from
the unit into the white 2 pin matching con-
nector in the electronic control box.
2. All LCD SZ Systems
a. Connect the previously run furnace thermo-
stat wires (if applicable) to the blue wires
protruding from the roof opening or to the
1/4" connectors at the electronic control box
using the supplied 1/4" insulated connectors.
The polarity of this connection does not ma-
ter.
FIG. 19
Connection
RV Wall
-12V
+12V
J. Upgrading from Bi-Metal Thermostat to
SZ LCD Thermostat
1. Remove the existing thermostat from the wall.
2. Disconnect the four (4) wires coming from the air
conditioner (red, yellow, orange, blue).
3. Disconnect the two (2) wires coming from the
furnace (+12V, -12V).
 Keep the red wires from the air
conditioner and furnace separate, to avoid con-
fusion when connecting the thermostat. Con-
necting the wires incorrectly could result in prop-
erty damage.
4. Refer to the wiring diagram (FIG. 19) and make
the connections as shown.
12
SZ LCD
or CTT
Splice
Thermostat
AC Roof
Opening
Splice
3316300.000
Control Box