© 2015 Mitsubishi Electric US, Inc.
5
Example 4: Single-stage Cooling with Alternate Primary Heating Source
Note: For this configuration, it is recommended to set SW2-6 to the
OFF position.
Follow the wiring from example 2, with the following adjustments:
1. Connect thermostat W1 to the alternate heat source.
2. Connect the thermostat W2 terminal to the PAC-US444CN-1 W1 terminal.
Connector
Purpose
Purpose
TC
Common (In)
C
C
Common (Out)
C
TR
24VAC (In)
R
R
24VAC (Out)
R
G3
Fan High
High Fan Speed
G2
Fan Medium
Medium Fan Speed
G1
Fan Low
Low Fan Speed
Y2
Y2
Stage 2 Cooling
Y1
Y1
Stage 1 Cooling
W2
W2
Stage 2 Heating
W1
W1
Stage 1 Heating
G
G
Fan
4. How to Install
1. Choose a place where to install the PAC-US444CN-1. The device provides two
mounting holes that can be used to mechanically affix the case to a solid surface.
Double-sided tape may be used to affix the device. When using tape, ensure that
the tape is approved for use within the anticipated operating temperature ranges.
2. Install the transformer, as necessary, per building code and manufacturer’s
installation instructions.
3. Connect the PAC-US444CN-1 cable to the connector CN105 on the indoor unit
control board.
4. Connect PAC-US444CN-1 terminals using 18 AWG wire.
Device Configuration
Initial settings can be configured via the two banks of dip switches on the circuit
board, SW1 and SW2. The circuit board can be accessed by unfastening the four
screws on the back of the case.
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