Haier 1U50MERFRA-4 User manual

Domestic air conditioner
SERVICE MANUAL
This service information is designed for experienced repair technicians only and is not designed for use by the general publi
●c.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
Repair the product or products dealt with in this service information by anyone else could result in serious injury or death
WARNING
2023 (Qingdao Haier Air Conditioner General corp. , Ltd)
All rights reserved. Unauthorized copying and distribution is a violation of law
Haier Group Version：V1 Date：2023-11-09
Model 1U50MERFRA-4

Contents
Domestic air conditioner
Contents
1.Introduction ............................................................................................. 1
2.Specifications .......................................................................................... 7
3.Sensors list
● ............................................................................................. 8
4.Pinping diagrams
● .................................................................................... 9
5.Operation range .................................................................................... 10
6.Printed Circuit Board Connector Wiring Diagram ................................. 11
7.Outdoor Functions and Control ............................................................. 14
8.Dimensional drawings
● ........................................................................... 28
10.Service Diagnosis
● ............................................................................... 29
11.Performence and cerves diagrams ..................................................... 51
12.Sound level ......................................................................................... 59
13.Circuit diagrams ..................................................................................60
14.Removal Procedure ............................................................................
61

Introduction
1Domestic air conditioner
1.Introduction
1.1 Model name explanation
1 U 5 0 M E R F A R
The maximum combination number
Type of outdoor unit : U (normal type)
Nominal cooling capacity (18000BTU/h)
P
latform of outdoor units: NEW 1.5P platform
Europe
Version number
Heat pump & R32 refrigerant
DC inverter
Apply toT1; 220~240V50HZ/1ph
4
Series number

Introduction
2 Domestic air conditioner
1.2 Safety Cautions
Be sure to read the following safety cautions before conducting repair work.
The caution items are classified into “Warning” and “Caution”. The “Warning” items are especially important
since they can lead to death or serious injury if they are not followed closely. The “Caution” items can also lead
●
to serious accidents under some conditions if they are not followed. Therefore, be sure to observe all the safety
caution items described below.
About the pictograms
△This symbol indicates an item for which caution must be exercised.
The pictogram shows the item to which attention must be paid.
○ This symbol indicates a prohibited action.
The prohibited item or action is shown inside or near the symbol.
● This symbol indicates an action that must be taken, or an instruction.
The instruction is shown inside or near the symbol.
After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates
Normally, and explain the cautions for operating the product to the customer.
1.2.1 Embedded wire checking before installation
Check the embedded wire diameter suitable to request:
(Power supply from indoor: 2.5kw ≥1.0mm2 3.5kw,5kw ≥1.5mm2 7kw ≥2.5mm2 ; Power supply from outdoor
≥1.0mm2 )
Check the embedded wire are four roots, L/N/COM/GND; GND is needed, if
●not, thunder or high voltage wave
from power grid will impact to the performance
●
Using a multi-meter to test short circuit of the four roots wires, make sure no short circuit happen.
●
1.2.2 Caution in Repair
●
Warning
Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for
a repair.
Working on the equipment that is connected to a power supply can cause an electrical shook.
If it is necessary to supply power to the equipment to conduct the repair or inspecting the circuits, do not
touch any electrically charged sections of the equipment.
If the refrigerant gas discharges during the repair work, do not touch the discharging refrigerant gas .The
refrigerant gas can cause frostbite.

Introduction
3 Domestic air conditioner
When disconnecting the suction or discharge pipe of the compressor at the welded section, release the
refrigerant gas completely at a well-ventilated place first.
If there is a gas remaining inside the compressor , the refrigerant gas or refrigerating machine oil
discharges when the pipe is disconnected, and it can cause injury.
If the refrigerant gas leaks during the repair work, ventilate the area. The refrigerant gas can generate
●
toxic gases when it contacts flames.
The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit.
Be sure to discharge the capacitor completely before conducting repair work . A charged capacitor can
cause an electrical shock.
Do not start or stop the air conditioner operation by plugging or unplugging the power cable plug.
Plugging or unplugging the power cable plug to operate the equipment can cause an electrical shock or
fire.
Warning
Do not repair the electrical components with wet hands .
● Working on the equipment with wet hands can
cause an electrical shock
●
Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical
●
shock.
Be sure to provide the grounding when repairing the equipment in a humid or wet place, to avoid
electrical
shock.
Be sure to turn off the power switch and unplug the power cable when cleaning the equipment. The
internal fan rotates at a high speed, and cause injury.
Do not tilt the unit when removing it. The water
●inside the unit can spill and wet the furniture and floor.
Be sure to check that the refrigerating cycle section has cooled down sufficiently before conducting
repair
work. Working on the unit when the refrigerating cycle section is hot can cause burns.
Use the welder in a well-ventilated place. Using the welder in an enclosed room can cause oxygen
deficiency.
1.2.3 Cautions Regarding Products after Repair
Warning
Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to

Introduction
4 Domestic air conditioner
conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools can
cause an electrical shock, excessive heat generation or fire.
When relocating the equipment, make sure that the new installation site has sufficient strength to
withstand the weight of the equipment.
If the installation site does not have sufficient strength and if the installation work is not conducted
securely, the equipment can fall and cause injury.
Be sure to install the product correctly by using the provided standard installation frame.
Incorrect use of the installation frame and improper installation can cause the equipment to fall, resulting
in injury.
For
integral
units only
Be sure to install the product securely in the installation frame mounted on a window frame.
If the unit is not securely mounted, it can fall and cause injury.
For
integral
units only
Warning
Be sure to use an exclusive power circuit for the equipment, and follow the technical standards related to
●
the electrical equipment, the internal wiring regulations and the instruction manual for installation when
●
conducting electrical work.
●
Insufficient power circuit capacity and improper electrical work can cause an electrical shock or fire.
Be sure to use the specified cable to connect between the indoor and outdoor units. Make the
connections securely and route the cable properly so that there is no force pulling the cable at the
connection terminals.
Improper connections can cause excessive heat generation or fire.
When connecting the cable between the indoor and outdoor units, make sure that the terminal cover
does
not lift off or dismount because of the cable.
●
If the cover is not mounted properly, the terminal connection section can cause an electrical shock,
excessive heat generation or fire.
Do not damage or modify the power cable.
Damaged or modified power cable can cause an electrical shock or fire. Placing heavy items on the
power cable, and heating or pulling the power cable can damage the cable.
●
Do not mix air or gas other than the specified refrigerant (R32) in the refrigerant system.
If air enters the refrigerating system, an excessively high pressure results, causing equipment damage
and injury.
If the refrigerant gas leaks, be sure to locate the leak and repair it before charging the refrigerant. After
charging refrigerant, make sure that there is no refrigerant leak.
If the leak cannot be located and the repair work must be stopped, be sure to perform pump-down and
close the service valve, to prevent the refrigerant gas from leaking into the room. The refrigerant gas
.

Introduction
5 Domestic air conditioner
itself
is harmless, but it can generate toxic gases when it contacts flames, such as fan and other heaters,
stoves and ranges.
When replacing the coin battery in the remote controller, be sure to disposed of the old battery to prevent
children from swallowing it.
If a child swallows the coin battery, see a doctor immediately.
Caution
Installation of a leakage breaker is necessary in some cases depending on the conditions of the
●
installation site, to prevent electrical shocks.
Do not install the equipment
● in a place where there is a possibility of combustible gas leaks.
If a combustible gas leaks and remains around the unit, it can cause a fire.
Be sure to install the packing and seal on the installation frame properly. If the packing and seal are not
installed properly, water can enter the room and wet the furniture and floor.
1.2.4 Inspection after Repair
●
Warning
Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet
all the way.
If the plug has dust or loose connection, it can cause an electrical shock or fire.
If the power cable and lead wires have scratches or deteriorated, be sure to replace them.
●
Damaged cable and wires can cause an electrical shock, excessive heat generation or fire.
Warning
●
Do not use a joined power cable or extension cable, or share the same power outlet with other electrical
appliances since it can cause an electrical shock, excessive heat generation or fire.

Introduction
6 Domestic air conditioner
Caution
Check to see if the parts and wires are mounted and connected properly, and if the connections at the
soldered or crimped terminals are secure. Improper installation and connections can cause excessive
heat generation, fire or an electrical shock.
●
If the installation platform or frame has corroded, replace it. Corroded installation platform or frame can
cause the unit to fall, resulting in injury.
●
Check the grounding, and repair it if the equipment is not properly grounded. Improper grounding can
cause an electrical shock.
Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 M
ohm or higher.
Faulty insulation can cause an electrical shock.
Be sure to check the drainage of the indoor unit after the repair.
●
Faulty drainage can cause the water to enter the room and wet the furniture and floor.
1.2.4 Using Icons
Icons are used to attract the attention of the reader to specific information. The meaning of each icon is described in
the table below:
1.2.5 Using Icons List
Icon Type of Information
● Description
Note Note A “note” provides information that is not indispensable, but may nevertheless be valuable to the reader, such as tips and tricks.
Caution
● Caution
A “caution” is used when there is danger that the reader, through
incorrect manipulation, may damage equipment, loose data, get
an
unexpected result or has to restart (part of) a procedure.
Warning Warning A “warning” is used when there is danger of personal injury.
Reference
A “reference” guides the reader to other places in this binder or in
this manual, where he/she will find additional information on a
specific topic.

Specification
7Domestic air conditioner
2.Specifications
NOMINAL DISTRIBUTION SYSTEM VOLTAGE
●
1 / esahP
05 zH ycneuqerF
220-240
V egatloV
NOMINAL CAPACITY and NOMINAL INPUT
gnitaeh gnilooC
Capacity rated kW 4.8 4.8
Btu/h
● 16380 12280
Power Consumption(Rated) kW 1.7 1.33
+A/0.4
6.3/A++
W/W POCS/REES
Annual energy consumption kWh 267 1260
h/³m lavomeR erutsioM 2.0*10﹣³
TECHNICAL SPECIFICATIONS-UNIT
Dimensions H*W*D
● mm 800×280×553
Packaged
Dimensions H*W*D mm 902×375×614
Weight / KG
● 29.2
Gross weight / KG 32.1
Sound level Sound pressure dB 54
Sound power dB 65
ELECTRICAL SPECIFICATIONS
gnitaeh gnilooC
Nominal running current A 7.4 5.8
Maximum running current A 8.6 8.6
1 1 A tnerruc gnitratS
TECHNICAL SPECIFICATIONS-PARTS
gnitaeh gnilooc
Compressor
rosserpmoC yratoR epyT
GTD130RKRF8LV6B
ledoM
Motor output
● W 1069
ACS-68R or equivalent
epyt liO
Oil charge volume L 0.44
Fan
naf laixA epyT
Motor output W 40
Air flow rate(high) m³/h 2200
Speed(high/low) rpm 950/400
-nif LM epyT taeH φ7HI-HX tube

Specification
8Domestic air conditioner
4.1*62*2 hctif*egats*woR regnahcxe
TECHNICAL SPECIFICATIONS-OTHERS
Refrigerant
circuit
Refrigerant type R32
Refrigerant charge KG 0.78
Maximum allowable distance
between indoor an outdoor M 20
Maximum allowable level difference
● m 15
Refrigerant control
Piping connections
(external diameter)
liquid mm Φ6.35
gas mm Φ12.7
drain
● mm Φ16
Heat insulation type Both liquid and Gas pipes
●
Max. piping Length m
●20
Max. Level Difference m 15
Chargeless m 7
Amount of Additional Charge of Refrigerant g/m 20
Note: the data are based on the conditions shown in the table below
htgnel gnipiP gnitaeh gnilooc
Indoor: 27 DB/19 WB℃ ℃
Outdoor: 35 DB/24 WB℃ ℃
Indoor:20 DB℃
Outdoor: 7 DB/6 WB℃ ℃ 5m
3.Sensors list
type Description Qty
Ambient sensor Its used for detecting temperature of outdoor side
1
Defrosting sensor Its used for controlling outdoor defrosting at heating mode
Descharging sensor Its used for compressor in case of over-heat
Conversation formulae
Kcal/h= kW×860
Btu/h= kW×3414
cfm=m³/min×35.3
CAPILLARY