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© 2015 Mitsubishi Electric US, Inc. 

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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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Summary of Contents for PAC-US444CN-1

Page 1: ...ety precautions before use Hazards that can occur from incorrect handling are classified by the symbols below Warning Incorrect handling can result in death serious injury etc Caution Incorrect handling can result in bodily injury and or structure damage After reading this manual keep this manual for future reference When the device is reinstalled or repaired give this manual to those who provide ...

Page 2: ...e internal parts cause device performance to be reduced and cause electrical shock Do not install the device in a bathroom kitchen or any room where steam could form Condensation may develop and cause electrical shock and or the device to malfunction Use standard wires with the proper current capacity to avoid the possibility of current leak excessive heat and or fire Do not touch the main circuit...

Page 3: ...sition 1 All wiring shown should be performed with 18 AWG thermostat wire 2 Terminals on the PAC US444CN 1 support 20 30VAC 3 High medium low fan signals are optional and may not be available on all thermostat models 4 W2 and Y2 signals are optional and may be omitted for single stage thermostats Example 1 Two stage Cooling and Heating Note When both Y2 and W2 are connected it is recommended to se...

Page 4: ...e When either Y2 or W2 is left unconnected it is recommended to set SW2 6 to the OFF position Example 3 Single stage Cooling and Heating with Dedicated Fan Speed Relays Note When connecting only first stage signals Y1 W1 it is recommended to set SW2 6 to the OFF position sandium com ...

Page 5: ... 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 buildi...

Page 6: ...ollowing settings SW1 3 SW1 4 Result OFF OFF Auto Default ON OFF Medium OFF ON High ON ON Custom Auto Note Custom Auto provides more comfortable fan speed operation vs the more efficient Auto default Two Stage Thermostat Operation SW2 6 Adjusts indoor unit operation during stage 1 heating and stage 1 cooling according to the following table SW2 6 Operation during stage 1 OFF Full capacity ON The c...

Page 7: ... Set by SW2 4 2 ON ON OFF 3 1 Set by SW2 4 2 ON ON ON 3 2 Set by SW2 4 2 Refer to the appropriate Indoor Unit Installation Manual for Mode 8 and Mode 10 function setting definitions CN24 Operation During Defrost SW2 4 Adjusts Mode 23 function settings according to the following table SW2 4 Result Fan and CN24 OFF Setting 2 Default ON ON Setting 1 OFF Refer to the appropriate Indoor Unit Installati...

Page 8: ...e thermostat s temperature sensing is used to set the room temperature The indoor unit thermistor is used when calculating cooling and heating rates of change 5 Usage Operate the third party thermostat per the manufacturer s instructions During normal operation the connection of Mitsubishi remote controllers e g MA ME is not supported as they will interfere with the correct operation of the PAC US...

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