Mitsubishi Electric PAC-IF082B-E User Manual

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English

FLOW TEMP. CONTROLLER [MAIN] (Cased)

PAC-IF081B-E

PAC-IF082B-E

PAC-IF083B-E

INSTALLATION MANUAL

For safe and correct use, read this manual thoroughly before installing the FTC unit.

FOR INSTALLER

Table of Contents

Questions and Answers:

T
Thomas MeyerAug 25, 2025
Why is my Mitsubishi Electric PAC-IF082B-E Controller showing 'Please Wait'?
- S
  Sharon JacksonAug 25, 2025
  The "Please Wait" message on your Mitsubishi Electric Controller may appear due to: normal operation (up to 6 minutes), communication failure between the main remote controller and FTC (Main), or communication failure between FTC (Main) and the outdoor unit. * If “0%” or “50-99%” is displayed below "Please Wait", there is a communication error between the main remote controller and the FTC (Main) control board. Check wiring connections on the main remote controller and replace the main remote controller or the FTC (Main) control board. * If “1-49%” is displayed there is a communication error between the outdoor unit's and FTC (Main) control boards. Check the wiring connections on the outdoor unit control board and the FTC (Main) control board.
A
amy98Aug 25, 2025
Why is my Mitsubishi Electric Controller noisy?
- R
  rhaneyAug 26, 2025
  A noisy water circulation pump in your Mitsubishi Electric Controller system is caused by air in the water circulation pump. Use manual and automatic air vents to remove air from the system. Top up water if necessary to achieve 1 bar on primary circuit.
J
Jessica LoweAug 29, 2025
What does it mean if LED4 on Mitsubishi Electric PAC-IF082B-E Controller FTC (Main) is blinking?
- H
  Heather ReevesAug 29, 2025
  If LED4 on the FTC (Main) of your Mitsubishi Electric Controller is blinking, it indicates a problem with the SD memory card: * Full of data: Move or delete data, or replace microSD memory card with a new one. * Write-protected: Release the write-protect switch. * NOT formatted: Refer to "4.11 Using microSD memory card". * Formatted in NTFS file system: FTC is not compatible with NTFS flie system. Use a microSD memory card formatted in FAT file system.
L
Lance AdamsAug 30, 2025
Why does my Mitsubishi Electric PAC-IF082B-E Controller have no hot water at the hot tap?
- C
  Christina FlemingAug 30, 2025
  If there's no hot water at the tap with your Mitsubishi Electric Controller, the possible causes are: * Cold main off: Check and open stop cock. * Strainer (local supply) blocked: Isolate water supply and clean strainer.
J
Joanne PerezAug 31, 2025
What does it mean if LED2 on Mitsubishi Electric Controller FTC (Main) is blinking?
- D
  danielalvarezSep 1, 2025
  When LED1 is also blinking on FTC (Main), this indicates faulty wiring between FTC (Main) and outdoor unit. Check for faulty wiring between FTC (Main) and outdoor unit.
A
Adam MitchellSep 1, 2025
Why does the temperature of DHW tank water drop with Mitsubishi Electric PAC-IF082B-E Controller?
- A
  April IbarraSep 1, 2025
  If the temperature of the DHW tank water has dropped in your Mitsubishi Electric Controller system, it may be due to: * Water leakage in the pipes that connect to the DHW tank. Take the following measures: retime the nuts holding the pipes onto the DHW tank, replace seal materials, replace the pipes. * Insulation material coming loose or off. Fix insulation. * 3-way valve failure. Check plumbing/wiring to 3-way valve.
E
Eric Harrison Jr.Sep 3, 2025
Why is there hot or warm water from the cold tap with Mitsubishi Electric PAC-IF082B-E Controller?
- C
  Cameron SaundersSep 3, 2025
  If you're experiencing hot or warm water coming from the cold tap with your Mitsubishi Electric Controller, it is because heat of hot water pipe is transferred to cold water pipe. Insulate/re-route pipework.
L
Laura WrightSep 5, 2025
What to do if there is water leakage in Mitsubishi Electric Controller?
- C
  Candace DixonSep 5, 2025
  If you notice water leakage in your Mitsubishi Electric Controller system, it could be due to: * Poorly sealed connections of water circuit components: Tighten connections as required. * Water circuit components reaching the end of life: Refer to the parts catalog in the service manual for expected part lifetimes and replace them as necessary.
G
Gerald RaymondSep 6, 2025
Why is LED4 on my Mitsubishi Electric PAC-IF082B-E Controller FTC (Main) off?
- S
  stewartkarenSep 6, 2025
  If LED4 on the FTC (Main) of your Mitsubishi Electric Controller is off, it could be due to: * SD memory card is NOT inserted into the memory card slot with correct orientation. Correctly insert SD memory card in place until a click is heard. * Not an SD standards compliant memory card. Use an SD standards compliant memory card.
G
Gregory EdwardsSep 7, 2025
Why does only Zone 2 not reach the set temperature in Mitsubishi Electric Controller?
- E
  Elizabeth GonzalezSep 7, 2025
  For a Mitsubishi Electric Controller with 2-zone temperature control, if only Zone 2 isn't reaching the set temperature, consider these factors: * When Zone 1 and Zone 2 are both in heating mode, the hot water temperature in Zone 2 does not exceed that in Zone 1. Normal operation no action necessary. * Faulty wiring of motorized mixing valve. Refer to "4.7 Wiring for 2-zone temperature control". * Faulty installation of motorized mixing valve. Check for correct installation. (Refer to the manual included with each motorized mixing valve.) * Incorrect setting of running time. Check for correct setting of running time. * Motorized mixing valve failure. Inspect the mixing valve.

Mitsubishi Electric PAC-IF082B-E Specifications

General

Brand	Mitsubishi Electric
Model	PAC-IF082B-E
Category	Controller
Language	English

Summary

1. Safety Precautions

1.1 Before Installation (Environment)

Precautions for installing the FTC unit in various environments to prevent damage or breakdown.

1.2 Before Installation or Relocation

Precautions to observe when moving the FTC unit to prevent injury or damage.

1.3 Before Electric Work

Safety precautions related to electrical work, including circuit breakers and wiring.

1. Safety Precautions (Continued)

1.4 Before Starting the Test Run

Precautions to take before initiating the FTC unit's test run to prevent damage.

1.5 Electric Booster and Immersion Heaters

Requirements for electric heaters used on the water circuit to prevent overheating.

2. Installing the FTC Unit

2.1 Check the Parts

List of supplied FTC unit components and instructions for checking them.

2.2 Choosing the FTC Unit Installation Location

Guidelines for selecting an appropriate installation location for the FTC unit.

2.3 Installing the FTC Unit

Step-by-step instructions for physically installing the FTC unit.

4. Electrical Work

4.1 Electrical Connection

General instructions and diagrams for electrical connections and wiring.

4.2 Connecting the Main Remote Controller

Instructions for connecting the main remote controller cable and its installation.

4.3 Main Remote Controller Options

Options for connecting remote controllers and sensors for 1-zone and 2-zone control.

4.4 Connecting the Thermistor Cables

Instructions for connecting various thermistor cables to the FTC controller.

4. Electrical Work (Continued)

4.5 Connecting Inputs/Outputs

Details on connecting signal inputs and outputs to the FTC controller.

4.10 Installation Procedure for DHW Tank

Step-by-step procedure for installing a DHW tank and related components.

4.6 Wiring for Heater

Wiring instructions for booster and immersion heaters.

4.11 Forced Cooling Mode Input (IN13)

4.7 Wiring for 2-Zone Temperature Control

Wiring for mixing valves and thermistors in a 2-zone temperature control setup.

4.12 Using microSD Memory Card

4.8 2-Zone Valve ON/OFF Control

Instructions for implementing 2-zone control using 2-way valves.

5. DIP Switch Setting

5.1 DIP Switch Functions

5.2 Outdoor Unit Type

5.3 Functions Setting

5.4 Operation Setting

5. DIP Switch Setting (Continued)

5.5 Emergency Mode (Heater Only Operation)

5.6 Emergency Mode (Boiler Operation)

5.7 Indoor Unit Only Operation

9. Troubleshooting

Troubleshooting by Inferior Phenomena

Table of fault symptoms, possible causes, and suggested solutions.

10. Multiple Outdoor Units Control

10.1 Wiring for Multiple Outdoor Units Control

10.2 Pipe Work

10.3 Electrical Connection

10.4 Main Remote Controller Wiring

10. Multiple Outdoor Units Control (Continued)

10.5 Connecting the Thermistor Cables

Basic Troubleshooting for Multiple Outdoor Units Control

10.6 DIP Switch Functions

10.6 DIP Switch Functions (Continued)

10.7 Connecting Inputs/Outputs

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