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MANUFACTURED FOR:
MITSUBISHI ELECTRIC US, INC.
Thermostat Interface 2
PAC-US445CN-1
INSTALLATION/INSTRUCTION MANUAL
Before using the device, carefully read this installation/instruction manual to ensure
proper operation.
Contents
1. Supplied parts .....................................................................................................1
2. Safety precautions ..............................................................................................1
3. System coniguration ...........................................................................................3
4. How to install .......................................................................................................5
5. Usage ..................................................................................................................9
6. Usage with PAA unit ............................................................................................9
1. Supplied parts
Check that the box includes the following parts in addition to this installation manual:
•
1 x Thermostat Interface 2 (PAC-US445CN-1)
•
1 x PAA unit accessory cable
2. Safety precautions
•
Thoroughly read the following safety precautions before use.
•
Hazards that can occur from incorrect handling are classiied by the symbols
below:
WARNING
CAUTION
•
After reading this manual, keep it 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 the new user receives this manual.
WARNING
• Only a dealer or qualiied technician
should install, relocate, reinstall or
repair the device.
Improper installation or repair may
result in electrical shock or ire.
Speciications are subject to change without notice.
Incorrect handling can result in death, serious injury, etc.
Incorrect handling can result in bodily injury and/or
structure damage.
FOR INSTALLER
• Properly install the device on a
stable, load-bearing surface.
Device installed on an unstable surface
may fall and cause injury.
© 2022 Mitsubishi Electric US, Inc
1
.
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Summary of Contents for Mitsubishi Electric PAC-US445CN-1
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Page 1: Table Of Contents
6. Usage with PAA unit ....................9 1. Supplied parts Check that the box includes the following parts in addition to this installation manual: • 1 x Thermostat Interface 2 (PAC-US445CN-1) • 1 x PAA unit accessory cable 2. Safety precautions •... - Page 2 • Do not immerse the device in water. also, make sure dust does not accumulate on the circuit board. Doing so may lead to electric shock or malfunctions. Speciications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc...
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Page 3: System Coniguration
4. W2 and Y2 signals are optional and may be omitted for single-stage thermostats. 5. The PAC-US445CN-1 runs in two modes: heating/cooling or of/fan. Upon receiving the initial request from the thermostat for the heating/cooling mode, the Thermostat Interface switches to the heating/cooling mode. - Page 4 Example 1: Two-stage cooling and heating PAC-US445CN-1 Example 2: Single-stage cooling and heating PAC-US445CN-1 Speciications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc...
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Page 5: How To Install
Note: For this coniguration, it is recommended to set SW2-6 to the ON 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-US445CN-1 W1 terminal. 4. How to install 4.1. Device coniguration Initial settings can be conigured via the two banks of DIP switches on the circuit board, SW1 and SW2. - Page 6 SW1-4 Result Custom Auto (default) Medium High Auto Note: Custom Auto (default) provides higher fan speeds for more comfortable fan speed operation vs. the more eicient Auto. Speciications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc...
- Page 7 Refer to the appropriate indoor unit installation manual for Mode 23 function setting deinitions. For Mode 23 function settings for the PAA unit, refer to the “Usage with PAA unit” section in this manual. Speciications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc...
- Page 8 PAC-US445CN-1 cable to the connector CN105 on the indoor unit control board. 4. Connect PAC-US445CN-1 terminals using 18 AWG wire. 4.4. Grouping The connection of more than one PAC-US445CN-1 to a single set of thermostat dry-contacts is not supported. 4.5. Temperature sensing The PAC-US445CN-1 relies upon both the 24 VAC thermostat and the indoor unit’s...
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Page 9: Usage
(R, C, W1, W2, Y1, Y2, G) 2. Connect the Thermostat Interface to the CN105 connector on the control board. 3. Connect the PAA unit accessory cable included with the PAC-US445CN-1 to the CNH02 connection on the relay board in the PAA control box. - Page 10 DIP switch SW01 on the relay board is located as indicated in the image and has 4 switches that change the coniguration. SW01 Speciications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc...
- Page 11 Signals from thermostat ‚ PAA unit control box ƒ Control signals to furnace (See terminal block image in “How to install Thermostat Interface in PAA unit control box” section.) Speciications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc...
- Page 12 After changing Mode 23 setting, you need to power cycle the system for the change to reliably take efect. This device is designed and intended for use in the residential environment. MEUS DOC# MD-1622-K001 Ver. 2, April 2022 PA79G664H02 Speciications are subject to change without notice. © 2022 Mitsubishi Electric US, Inc...
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