Haier FlexFit Multi 4U36MS2VHB User Manual

DFS05-19
DFS05-19
Multi-Split Communication Wiring Check
The FlexFit Multi and Arctic multi systems are capable of performing a self-test to check
communication wiring between the outdoor to the indoor units. This is a crucial step when performing
start-up on a system as well as performing checks during a service call. It allows you to confirm that
the wiring matches with the associated refrigerant lines for a given circuit.
Arctic Multi 2U20EH2VHA
3U24EH2VHA
FlexFit Multi 3U24MS2VHB
4U36MS2VHB
1
Models affected:
Instructions:
1. Disconnect power to the outdoor unit.
2. Set Dip Switches SW1-1, SW1-2, SW1-3 &
SW1-4 to the ON position. These dip
switches are located on the Service Monitor
Board. (pictured right).
3. Turn ON power to the outdoor unit.
JUNE 2019
Service Bulletin
SW1

Haier FlexFit Multi 4U36MS2VHB Specifications

General

Cooling Capacity (BTU)	36000
Number of Connectable Indoor Units	Up to 4
Refrigerant	R410A
Outdoor Unit Dimensions (W x H x D)	950 x 840 x 340 mm
Type	Multi Split Air Conditioner
Power Supply	220-240V, 50Hz
Indoor Unit Dimensions (W x H x D)	Varies depending on the connected indoor unit model
Indoor Unit Weight	Varies depending on the connected indoor unit model
Features	Inverter technology, Sleep Mode, Timer

Summary

Multi-Split Communication Wiring Check Procedure

Initial Setup Instructions

Steps to disconnect power, set dip switches to ON, and reconnect power for the wiring check.

System Testing Execution

Details on indoor fan operation, EEV states, compressor ramp-up, and digital display indicators during the test.

Interpreting Test Results

Understanding digital display codes ('EC', '0') and LED indicators to confirm wiring correctness or identify faults.