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© 2015 Mitsubishi Electric US, Inc. 

1

 • Only a dealer or qualified technician 

should install, relocate, reinstall, or 

repair the device.

Improper installation or repair may 

result in electrical shock or fire.

 • Properly install the device on a 

stable, load-bearing surface.

Device installed on an unstable 

surface may fall and cause injury.

Contents

 1.  Supplied Parts.......................................................................................................1

 

 2.  Safety Precautions.................................................................................................1

 

 3.  System Configuration............................................................................................3

 

 4.  How to Install.........................................................................................................5

 

 5.  Usage....................................................................................................................8

 1.  Confirming the Supplied Parts

Check that the box includes the following part(s) in addition to this 

 

installation manual: 

  PAC-US444CN-1 Thermostat Interface (1) 

 

 2.  Safety Precautions

  •  Thoroughly read the following safety 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 these services. 

When the user changes, make sure that the new user receives this manual.

 

Warning

MANUFACTURED FOR:

MITSUBISHI ELECTRIC US, INC.

PAC-US444CN-1

INSTALLATION/INSTRUCTION MANUAL

 

 

Before using the device, carefully read this installation/instruction manual to ensure 

proper operation.

 

Keep this manual for future reference and give it to the technician when the device 

is reinstalled or repaired.

FOR INSTALLER

Thermostat Interface

sandium.com

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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