Check that the box includes the following part(s) in addition to this installation manual:
2. Safety Precautions
Warning
Caution
Two-stage Cooling and Heating
Single-stage Cooling and Heating
Single-stage Cooling and Heating with Dedicated Fan Speed Relays
Single-stage Cooling with Alternate Primary Heating Source
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 |
Follow the wiring from example 2, with the following adjustments:
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
Delayed Off
SW1-1/2: After reaching thermostat set point, the unit will continue to run for a set period of time in order to improve efficiency. The period of time is set by adjusting SW1-1 and SW1-2 according to the following table:
SW1-1 | SW1-2 | Result |
OFF | OFF | 5 minutes (Default) |
ON | OFF | 10 minutes |
OFF | ON | 30 minutes |
ON | ON | 0 minutes |
SW1-3 | SW1-4 | Result |
OFF | OFF | Auto (Default) |
ON | OFF | Medium |
OFF | ON | High |
ON | ON | Custom Auto |
Two-Stage Thermostat Operation
SW2-6: Adjusts indoor unit operation during stage 1 heating and stage 1 cooling
according to the following table:
Static Pressure Settings
SW2-1, SW2-2, SW2-3: These adjust the static pressure function settings of the indoor unit according to the following table:
DIP switch position on PAC-US444CN-1 | Indoor Unit Settings | |||||
SW2-1 | SW2-2 | SW2-3 | Mode 8 | Mode 10 | Mode 23 | Mode 11 |
OFF | OFF | OFF | Not set | Not set | Not set | Not set |
OFF | OFF | ON | Not set | Not set | Not set | Not set |
OFF | ON | OFF | 2 | 1 | Set by SW2-4 | 2 |
OFF | ON | ON | 2 | 2 | Set by SW2-4 | 2 |
ON | OFF | OFF | 1 | 1 | Set by SW2-4 | 2 |
ON | OFF | ON | 1 | 2 | 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 |
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 |
Fan Speed During Heating Mode, Thermal Off
SW2-5: Adjusts Mode 25 initial setting (fan speed in thermal off for heating) according to the following table:
SW2-5 | Result |
OFF | Extra low (Default) |
ON | Set by Thermostat Interface |
In addition, the adapter also affects the following function settings of the connected indoor unit
Mode | When using the adapter |
Mode 1 (auto recovery after power failure) | Always enabled |
Mode 2 (room temperature detection location) | Unused (room temperature detected by the connected thermostat) |
Mode 24 (heat offset for height) | Unused |
Grouping
The connection of more than one PAC-US444CN-1 to a single set of thermostat dry-contacts is not supported.
Temperature Sensing
The PAC-US444CN-1 relies upon both the dry-contact thermostat and the indoor unit’s thermistors in order to monitor room temperature. The 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
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‑US444CN‑1.
Notes:
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MITSUBISHI ELECTRIC PAC-US444CN-1 Thermostat Installation
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