Haier HSU18VH7 User manual

Domestic
Air conditioner
CAUTION
READ THIS MANUAL
CAREFULLY TO
DIAGNOSE TROUBLE
CORRECTLY BEFORE
OFFERING SERVICE.
THIS MANUAL IS USED
BY QUALIFIED
APPLIANCE
TECHNICIANS ONLY.
HAIER DOES NOT
ASSUME ANY
RESPONSIBILITY FOR
PROPERTY DAMAGE
OR PERSONAL INJURY
FOR IMPROPER
SERVICE
PROCEDURES DONE
BY ONE UNQUALIFIED
PERSON.
HSU18VH7
Air conditioner Edition: 10070808

Air conditioner Edition: 10070808
CONTENTS
1. GENERAL INFORMATION................................................................1
2. SPECIFICATION................................................................................3
3. ELECTRICAL CONTROLS ...............................................................4
4. TROUBLESHOOTING.....................................................................10
5. INSTALLA TION................................................................................12
6. WIRING DIAGRAM...........................................................................20
7. THERMISTOR RESISTANCE CHART..............................................22
8. COMPRESSOR PERFORMANCE DIAGRAM.................................24
9. SCHEMATIC DIAGRAM OF PCB....................................................25

Air conditioner Edition: 10070808
- 1 -
1. General information
This Service Manual describes the operation, disassembly, troubleshooting, and
repair of Haier Room Air Conditioners, etc. It is intended for use by authorized services
who troubleshoot and repair these units.
It is assumed that users of this manual are familiar with the use of tools and
equipment used to troubleshoot and repair electrical, mechanical, and refrigeration
systems; and understand the terminology used to describe and discuss them.
Haier urges you read and follow all safety precautions and warnings contained in this
manual. Failure to comply with safety information may result in severe personal injury or
death.
Related Publications
This is a base service manual, covering a range of similar models. It is intended to be
used in conjunction with the Parts Manual and Technical Sheet covering specific model
being serviced.
NOTE: General Precautions and Warnings
WARNING
To avoid risk of personal injury or death due to electrical shock, disconnect electrical
power to unit before attempting to service the unit.
WARNING
To avoid risk of personal injury or death due to electrical shock, DO NOT, under any
circumstances, alter the grounding plug .Air conditioner must be grounded at all times. Do
not remove warning tag from power cord. If a two-prong (non-grounding) wall receptacle
is encountered, contact a qualified electrician and have the receptacle replaced with a
properly grounder wall receptacle in accordance with the National Electrical Code.
WARNING
To avoid risk of heat exposure, which may cause death or severe illness, air
conditioner must be monitored when malfunctions or shuts down.
WARNING
To avoid risk of personal injury or death due to electrical shock, grounding wires and
wires colored like grounding wires are NOT to be used as current carrying conductors.
The standard accepted color coding for ground wires is green or green with a yellow
stripe. Electrical components such as the compressor and fan motor are grounded
through an individual wire attached to the electrical component and to another part of the
air conditioner. Grounding wires should not to be removed from individual components
while servicing, unless the component is to be removed and replaced. It is extremely
important to replace all removed grounding wires before completing service.
!
!
!
!

HSU18VH7
10070808
Product Features
FAN SPEED
TEMP
SIGNAL SENDING
SLEEP
HEALTH
POWER ON/OFF
18000/17800 BTU
1580/1560W/7/7.5A
SEER:13.0/13.0
18000/18000 BTU
1520/1480W/6.7/7.2A
HSPF:7.7/7.7
500 CFM
1PH 230/208V ~ 60Hz

3
HSU18VH7
18000/17800 BTU
18000/18000 BTU
1580/1560W/7/7.5A
1520/1480W/6.7/7.2A
13.0/13.0
7.7/7.7
1350rpm
500/480/450CFM
1260rpm
1180rpm
900/830rpm
Toshiba/PA160X2CS-3KUU
750ml
47/46/44 47/45/44
60/62
600Psig
600Psig
40lbs
116lbs
124lbs
/
/
R410A/67.4Oz
-7℃～43℃
1 PH 230/208V / 60Hz
T1
3G2.5mm2
YR-H24
I
50g
Φ16mm
Φ6.35/12.7mm
7m
3/15m
33.6lbs
SEER
HSPF
5.2 Pints/hr
8 13/16*45 15/32*12 1/8
28 3/4*33 27/32*10 1/2
9 13/16*40 3/8*14 1/8
26 3/4*32 5/8*13 15/16
IP24
Φ16mm
Indoor(H/M/L)
Outdoor
(High/Med/Low)
(dB)
10070808
Low pressure at cool side

4
10070808
60 86 F
F
60 86 F
F
60 86 F
F
3.1 Basic Function

Air conditioner Edition: 10070808
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3.2 . Introduction to electrical control functions
Including brief introduction to air conditioners of series models and electric control
function.
Brief introduction to electric control function
Automatic running (applicable to fan-coil model)
When the running mode is turned to automation after starting the system, the system
will first determine the running mode according to the current room temperature and then
will run according to the determined mode. Tr in the following selection conditions means
room temperature, Ts means setting temperature, Tp means temperature of indoor coil
pipe
a. Tr≥23℃ running refrigerating mode Ts=26℃
b. Tr<23℃ running heating mode Ts=23℃
After turning to the automation mode, the running mode can be switched between
refrigerating mode, fan mode and heating mode according to the change of the indoor
ambient temperature. But the automatic conversion between refrigerating mode and
heating mode must be conducted after 15 minutes.
Indoor temperature control
Compressor ON
Dehumidification running
The compressor, outdoor fan and indoor fan will run as per the following working
pattern so as to realize the refrigerating running of dehumidification:
Tr> Ts+2℃, compressor, outdoor fan run continuously, indoor fan runs as
per setting wind speed (State 1);
Ts+2℃≥Tr≥Ts, compressor, outdoor fan run intermittently with 10
minutes ON, 6 minutes OFF. (Compressor and outdoor fan are synchronous)
indoor fan runs in fixed lower wind speed, and will cease at the stand-by time of 3
minutes (State 2)
Tr <Ts, compressor, outdoor fan ceases, indoor fan runs in lower wind speed.
(State 3)
Heating
-1 +1
Compressor OFF
Setting temperature
Compressor OFF
压机关
Setting temperature
Refrigerating
+1
-1
Compressor ON
3.2.1
3.2.2
3.2.3
3.2.3.1
3.2.3.2
3.2.3.3

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Air conditioner Edition: 10070808
State1
State2
State3
Ts-1 Ts Ts+2 Ts+3
Warm start (preventing cold wind when heating running begins, applicable to
fan-coil model))
When heating running begins, indoor fan will conduct the following fan control:
If the temperature of indoor coil pipe is ≥ 23℃, start lower wind speed;
If the temperature of indoor coil pipe is ≥ 38℃ or the running time of
compressor≥ 4 minutes, turn to setting wind speed.
Control of indoor fan under heating OFF state (applicable to fan-coil model)
Under heating state, the compressor will cease; if the indoor coil pipe’s
temperature Tp≥23℃, indoor fan will run in lower wind speed.
Defrosting control (applicable to fan-coil model)
Defrosting beginning condition:
a. After the state of Tp-Tr<16℃ is continued for 5 minutes, the accumulated
running time of the compressor exceeds 45 minutes, the continuous running
time of the compressor exceeds 20 minutes;
b. The accumulated running time of the compressor exceeds 3 hours, the
continuous running time of the compressor exceeds 20 minutes, indoor
unit’s Tp <38℃;
c. The continuous running time of the compressor exceeds 20 minutes, the
temperature of indoor coil pipe decreases 1℃ every 6 minutes, which lasts
for more than 3 times, indoor unit’s Tp <38℃;
d. When the indoor unit is in the state of overload protection and the outdoor
unit ceases, when the rerunning time of outdoor unit exceeds10 minutes, the
accumulated running time of the compressor exceeds 45 minutes, the
continuous running time of the compressor is over 20 minutes, and Tp <38
℃.
Defrosting will begin if one of the above conditions is met.
Defrosting finishing condition:
If the defrosting time exceeds 9 (for 12 models)or 7 (for 07,09 models)
minutes,the original heating state will be resumed;
3.2.4
3.2.5
3.2.6

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Air conditioner Edition: 100070808
Note: Sequence of defrosting actions:
9(or 7)minutes
Compressor ON
OFF
Four-way valve ON
OFF
Outdoor fan ON
OFF
55s 55s
1min 1min
Freezing prevention function
Under refrigerating and dehumidifying state, the air conditioner will control the
outdoor fan as per the temperature Tp of the indoor coil pipe according to the
following conditions:
Zone of return deference
Compressor,outdoor fan OFF after 5 minutes Fan,compressor ON
0 7 Tp(℃.)
3 minutes stand-by time
When the compressor ceases due to the sensor OFF, unit On or OFF or fault, it
will maintain pause for 3 minutes.
Overload protection during heating running
Temperature protection of indoor coil pipe: Under heating state, the air
conditioner will control the running of the fan as per the temperature Tp of the
indoor coil pipe and according to the following conditions:
a.
a.
58℃≤Tp, outdoor fan ceases; Tp≤54℃, outdoor fan resumes; the time
from ceasing to resuming is about 45 seconds;
b.
b.
68℃≤Tp, outdoor fan of compressor ceases after 5 seconds; Tp≤47℃,
compressor resumes after 3 minutes.
Current protection (different models have different protection currents):
a. When 13.0A ≤current of compressor, outdoor fan cease; current of compressor
≤11.7A, outdoor fan resume;
Compensatory function of power failure
If the unit is suddenly off during running due to power failure, or closed for
maintenance or troubleshooting, it will restart to run after the power resumes with
the original condition before the unit is off
Note: Function setting: Pressing the SLEEP button on the remote control unit
for 10 times until hearing 4 sounds from the buzzer on the panel.
Memory content: Running mode, setting wind speed, setting
3.2.7
3.2.8
3.2.9
3.2.10

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Air conditioner Edition: 10070808
temperature, sleep state, flap state.
. Cancellation of function: Pressing the SLEEP button on the remote
control unit for 10 times until hearing 2 sounds from the buzzer on the
panel.
Trial run function
When the air conditioner is in OFF state, press the emergency switch for 5
seconds till hearing 2 sounds of click from the buzzer, then the air conditioner will
turn to the trial run state. The unit will run in the refrigerating mode and the
indoor fan will run in high wind speed mode.
Emergency running mode
When the air conditioner is in stand-by state, press the emergency switch till
hearing a sound from the buzzer, then the air conditioner will turn to the
emergency run state. The rules of emergency run are as follows:
a. Tr≥23℃, running refrigerating mode, Ts = 26℃;
b. Tr<23℃, running heating mode, Ts = 23℃.
Temperature compensation.
There is the function of automatic temperature compensation when heating, with
heating temperature setting = Ts(remote setting) + 4℃.
Sleeping function
a. After setting the sleeping function, the refrigerating mode and dehumidification
mode will run as per the following rules:
6hours
T(℃)
1 hour
Ts+2
Ts+1 1 hours
Ts Sleep OFF t(hour)
b. After setting the sleeping function, the heating mode will run as per the
following rules:
T(℃)
Ts 3hours 3hours
Ts-2
Ts-3
Ts-4
1 hour
As shown in the above diagram, after running for 1 hour under refrigerating mode and
dehumidification mode, the setting temperature will increase 1
℃
; after
c
3.2.11
3.2.12
3.2.13
3.2.14

MODEL The SW2 select“25”OR “35”
HSU18VH7 0010403861
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Air conditioner Edition: 10070808
25
PCB
running for 1 hour under heating mode, the setting temperature will decrease 2
℃
,
after another 1 hour, it will decrease the 2
℃
again, and after 3 hours, it will
increase
1℃
, and after other 3 hours, it will cease.

10070808
10

Air conditioner Edition: 10070808
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Table for Wrong Codes
Wrong express
power timing operating
★ ■ ■
indoor ambient
temperature
sensor
abnormal
Check the sensor of indoor ambient
temperature,if the resistance value is
0 or ∞,the sensor is
abnormal.
see the following flow chart 1
Multimeter
★ □ □
indoor pipe
temperature
sensor
abnormal
Check the sensor of indoor coilpipe
,if the resistance value is 0 or
∞,the sensor is abnormal.
see the following flow chart 1
Multimeter
★ □ ★
Data error or no
EEPROM
Check whether the EEPROM is
installed properly
Change the indoor PCB Multimeter
reasons
Ways and means
solutions
tools
□on★flash■off
■ □ ★
Indoor fan
motor don’t
feed back
Check whether indoor PCB or motor
is abnormal
see the following flow chart 2
Multimeter
chart 1: SENSOR MALFUNCTIONS
YES
YES
NO
Pull out the terminals on the indoor
mainboard and reinsert them.
Replace with new sensor
Replace with new indoor PCB
The Indoor PCB is broken
YES
Firstly check whether Terminal CN8 on
the indoor mainboard contact well or not?
Pull the sensor out of the mainboard
1) measure the value of resistance between its two jumpers
2)measure the temperature at the room temperature sensing head.
Check the specifications of the sensor to decide whether the sensor is damaged or not?
NO
chart 2 Indoor fan motor malfunction
NO
NO
the PCB of the indoor unit is damaged and needs replacing
Pull out and reinsert the terminals.
YES
Check whether Terminal CN2 on the indoor mainboard is well inserted or not?
Electrify the machine again and turn it on in the Cool state with the remote controller.
Measure the voltage between 1 and 4 of Terminal CN2 about DC150-380V,Measure the
voltage between 5 and 4 of Terminal CN2 on the indoor mainboard about DC13-16.5V.
Measure the voltage between 7 and 4 of Terminal CN2 about 1-6.5v
the motor of the indoor
unit is damaged and needs
replacing.
YES

10070808
12

13
10070808

10070808
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Air conditioner Edition: 10070808

Indoor unit
10070808
16
Connecting wiring:AWG12X5.
Power Cable:AWG12X3.
Grounding line
yl
p
p
us
re
w
o
P
Connecting wiring:AWG12X4+AWG18X2.
Power Cable:AWG12X3.
Grounding line
y
l
p
p
us
r
e
w
oP

10070808
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10070808
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