Haier HBU-18CF03 User manual

Commercial Air Conditioning
SERVICE MANUAL
Model
HBU-18CF03 HDU-42CF03/H
HPU-42HF03
 Features
 Long distribution pipe and high drop
 Auto-check function
 Flexible and easy installation
 Fresh air hole, more natural, more healthy
 Infrared remote controller & wired controller
●Optional safety devices and much more precision control device
Manual code: SYJS-019-05REV.0 Edition: 2005-12-01

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
2
CONTENTS
Contents……………………………………………………….....2
1. Description of products& features………………………....3
2. Specification…………………………………………………..7
3. Safety precaution……………………………………………11
4. Net dimension of indoor and outdoor……………………..13
5. Installation instructions………..…………………………….16
6. Parts and functions………………………………………….37
7. Remote controller functions………………………………...40
8. Refrigerant diagram………………………………………....61
9. Electrical control functions………………………………….64
10. Diagnostic information (trouble shooting)………………..70
11. Electrical data……………………………………………….74
12. Air velocity distribution……………………………………..88

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
3
1.DESCRIPTION OF PRODUCTS & FEATURES
1.1. Products code explanation
HBU---18 C F 03
Applicable voltage: 03 stands for 200-220V/50Hz
Design number
Product type: H stands for heat pump type, C stands for cool
only type, E stands for electric heating type
Cooling / Heating capacity,18=18000BTU/h
Product type : “B” stands for cassette type, “C” stands for
convertible type, ”D” stands for duct, “P” stands for cabinet
type, ”Q” stands for chiller system, "E" stands for ceiling
concealed type, “U” stands for outdoor unit
Haier
1.2 Brief Introduction for T1、T2、T3 working condition
1.3 Operating Range of Air Conditioners
Temp. Mode Rated Maximum Minimum
DB ℃27 32 15
Indoor WB ℃19 23 14
DB ℃35 43 -5
Cooling Outdoor WB ℃24 26 6
DB ℃20 27 10
Indoor WB ℃14.5 --- --
DB ℃7 23 -10
Heating Outdoor WB ℃6 18 ---
Climate type
Type of Air
Conditioner T1 T2 T3
Cooling Only 18 ℃~43℃10℃~35℃21℃~52℃
Heat pump -7℃~43℃-7℃~35℃-7℃~52℃
Electricity Heating ~43℃~35℃~52℃

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
4
1.4 Products line up
HBU-18CF03 HDU-42CF03/H HPU-42HF03
1.5 Product features
1.5.1 Outdoor unit .
Flexible and easy installation
The outdoor can meet the higher request of installation. From the specifications, you will find for
each unit, how long and how high the piping will be, which will be convenient for design and installation.
Optional safety devices and much more precision control device
a. Ambient temperature sensor,coil temperature sensor and compressor temperature sensor
make the temperature control and defrosting control more precise.
b. High/low pressure switch can feel the discharging pipe pressure and suction pipe pressure on
time and precisely. If the pressure is too low or too high, it will stop the compressor to prevent it
being damaged for the sake of pressure.
c. 3 minutes delay protection for the compressor, the device can protect the compressor from
some damages and make the compressor have a long life.
Silent operation
New design of long piping length and large drop

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
5
1.5.2 Indoor unit
1.5.2.1 Noblest cassette indoor unit
Compact indoor unit body
The dimsension of indoor unit is 570×570×260, convenient for installation in the ceiling, perfectly
match with the decor of indoor decoration and be in accordance with the standard of aesthetics.
Fresh air inlet hole
The cassette indoor unit is equipped with a fresh air hole, from which you can get the fresh air from
the outdoor, to improve the indoor air quality. More natural and more healthier.
Convenient infrared remote controller
The newly designed infrared remote controller YR-H71 can be used for all indoor units of single type,
multi split type, and H-MRV type except for the cabinet unit. This controller can be compatible with all old
remote controllers except for that of cabinet units.
Auto-check function
The unit can display the malfunction codes on the control board by using advanced auto-check
technology, convenient for user find and dwell with the abnormal running.
Built-in high head drain water pump
Due to the internal float switch, built-in drain water pump can drain water automatically when the
condensation is full enough and necessary to be cleaned, the standard head height can be up to 600mm,
realizing the most effective water drainage.
Quiet operation
The unit is equipped with the greatly powerful, smooth, and ultra quiet multi-blade fan, which has the
irregular helix, and can run in silence.
1.5.2.2 Elegant duct indoor unit
Space saving design
With the minimum thickness of only 225mm, the unit almost can be installed into any ducted space.
It needs not the very big space, and will not effect the exterior decoration, only leave people comfortable
air not feeling its existence.
High efficiency filter
The unit adopts G3 grade filter, can efficiently filter the dirt etc, and improve the room air quality, at
the same time, the filter can pull out from downside, convenient for maintenance and cleaning.
Multi-mode for installation
The indoor unit can be installed with or without an air return duct according to the installation need.

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
6
Free setting of air discharging duct
The number of the airflow outlet and its installation position can be freely selected according to the
environment of the room, sufficiently considering the load of the room and the uniform temperature of the
room to realize more perfect comfort.
High esp design
Max. external static pressure of 196 Pa brings the quick temperature adjustment to the room.
Adopts high pressure fan to provide quich speed of air blowing while keeping a low sound level and
ensuring a good air circulation of the whole indoor space.
Ultra high head water drain up
The duct unit adopt the water pump, which can be up to 600mm.
1.5.2.3 Steady cabinet indoor unit
Powerfull running & long distance air sending
The unit can run powerfully and supply large volume of cooled air to the room. Long distance and
large angle air sending ensures average temperature distribution, bring you much more comfortable
indoor environment in the shortest time.
Newly designed display panel, more simple
On the display panel there are power, operation, timer, and electric heating indicator, from which
you can find the operation state directly, and the indicator flash times can show the failure.
Malfunction Auto-checking
Failure codes displayed by LED or controllers are so detailed for us to find the fail place more
quickly, and can judge the failure content easily.
Powerfull/Soft function
Special button on remoto controller is used to set powerful working or soft working.
Single fan outdoor, more compact
Central control function, if connected with a detector and a central
controller

Function coolin
g
heatin
g
Capacity BTU/h 17000 /
Capacity kW 5/
Sensible heat ratio 75% /
W1780 /
W2400 /
EER or COP W/W 2.81 /
Dehumidifying capacity 10‐³×m³/h
Power cable section
Signal cable section
Connecting cable section
Wired control cable for wired control unit section //
Power source N, V, Hz
A / A
Start Current A
Class of anti electric shock I/
Circuit breaker A /30
Max. operating pressure of heat side Mpa
Max. operating pressure of cold side Mpa
Unit model (color)
Type × Number
Speed(H-M-L) r/min
Fan motor output power kW
Air-flow(H-M-L) m³/h
Type / Diameter mm
Total Area m²
Temp. scope ℃
External （L×W×H）mm×mm×mm
Package （L×W×H）mm×mm×mm
Air sending angle //
Drainage pipe (material , I.D./O.D.) mm
Control type (Remote /wired /model)
Fresh air hole dimension mm
Outlet distribution hole dimension mm
kW
dB(A)
kg / kg
External （L×W×H）mm×mm×mm
Package （L×W×H）mm×mm×mm
kg / kg
Unit model (color)
Model / Manufacture
Oil model
Oil type
Oil charging
Type
Protection type
Starting method
Type × Number
Speed r/min
Fan motor output power kW
Air-flow(H-M-L) m³/h
Type / Diameter mm
Row / Fin pitch
Temp. scope ℃
External （L×W×H）mm×mm×mm
Package （L×W×H）mm×mm×mm
Drainage pipe (material , I.D./O.D.) mm
Refrigerant control method mm/mm
Volume of Accumulator L
Noise level dB(A)
material of reduce noise
crankcase heater power W
kg / kg
Type / Charge g
Recharge quantity g/m
Liquid mm
Gas mm
Connecting Method m
m
Norminal condition: indoor temperature (cooling): 27℃DB/19℃WB, indoor temperature (heating): 20℃DB
Outdoor temperature(cooling): 35℃DB/24℃WB, outdoor temperature(heating): 7℃DB/6℃WB
The noise level will be measured in the third octave band limited values, using a Real Time Analyser calibrated sound intensity meter. It is a
sound pressure noise level.
750±20/650±30/520±30
1,220-230,50
Indoor unit
HBU-18HF03(INDOOR) (WHITE)
Noise level (H-M-L)
Electricity Heater
8.2/11.0
40
/
570×570×260
REMOTE
0.055
item Model HBU-18CF03
1.6
3×2.5mm2
Total power input
Max. power input
Running /Max.Running
Centrifugal×1
0.03
2500
/
TH338VEEC MITSUBISHI
3.5/4.5
740×750×115
/
520
inset protector
Outdoor unit
HBU-18CF03
(
OUTDOOR
)
（WHITE）
Weight (Net / Shipping) 25/27
Panel
Dimension 815×340×680
960×406×750
/
cooling: 43~60 / heating: 6~7
PIPING
R22/1800
/
Pipe 6.35
12.7
Flared
Between I.D &O.MAX.Drop 5
MAX.Pi
p
in
g
len
g
th 15
Axial × 1
Weight (Net / Shipping) 53/56
Type of Four way valve /
/
Heat exchanger /
Refrigerant
Defrosting Automatic
/
/
45/40/32
/
56
860±30
ROTARY
force start
/
Capillary tube
Fan
Heat exchanger
Fan
Dimension
Compressor
Weight (Net / Shipping)
Dimension
/
3×2.0mm2
2.94
2.94
DIAMOND MS-56
/
/
670
700×700×60
cooling: 43~60 heating:6~7
718×680×380
2. Specification
Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
7

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
8
Function coolin
g
heatin
g
Capacity BTU/h 42600 /
Capacity kW 12.5 /
Sensible heat ratio 75% /
W4700 /
W5700 /
EER or COP W/W 2.66 /
Dehumidifying capacity 10‐³×m³/h
Power cable section
Signal cable section
Connecting cable section
Wired control cable for wired control unit section /4×0.33mm²屏蔽线
Power source N, V, Hz
A / A
Start Current A
Class of anti electric shock I/
Circuit breaker A /30
Max. operating pressure of heat side Mpa 2.8 /
Max. operating pressure of cold side Mpa 0.8 /
Unit model (color)
Type × Number
Speed(H-M-L) r/min
Fan motor output power kW
Air-flow(H-M-L) m³/h
Type / Diameter mm
Total Area m²
Temp. scope ℃
External （L×W×H）mm×mm×mm
Package （L×W×H）mm×mm×mm
Air sending angle //
Drainage pipe (material , I.D./O.D.) mm
Control type (Remote /wired /model)
Fresh air hole dimension mm
Outlet distribution hole dimension mm
kW
dB(A)
kg / kg
External （L×W×H）mm×mm×mm
Package （L×W×H）mm×mm×mm
kg / kg
Unit model (color)
Model / Manufacture
Oil model
Oil type
Oil charging
Type
Protection type
Starting method
Type × Number
Speed r/min
Fan motor output power kW
Air-flow(H-M-L) m³/h
Type / Diameter mm
Row / Fin pitch
Temp. scope ℃
External （L×W×H）mm×mm×mm
Package （L×W×H）mm×mm×mm
Drainage pipe (material , I.D./O.D.) mm
Refrigerant control method mm/mm
Volume of Accumulator L
Noise level dB(A)
material of reduce noise
crankcase heater power W
kg / kg
Type / Charge g
Recharge quantity g/m
Liquid mm
Gas mm
Connecting Method m
m
4×0.75mm2
SUNISO 4GSDID-K/DAPHNE SE56P
/
1500-1700
0.27
2040
Norminal condition: indoor temperature (cooling): 27℃DB/19℃WB, indoor temperature (heating): 20℃DB
Outdoor temperature(cooling): 35℃DB/24℃WB, outdoor temperature(heating): 7℃DB/6℃WB
The noise level will be measured in the third octave band limited values, using a Real Time Analyser calibrated sound intensity meter. It is a
sound pressure noise level. The detailed method please refer to the following information:
1070±30/950±40/860±50/690±50
3，380-400，50
Indoor unit
HDU-42CF03/H(INDOOR)（WHITE）
Noise level (H-M-L)
Electricity Heater
cooling 8.2/9.5
50
/
/
cooling: 43~60 / heating: 6~7
1450×980×530
/
1197×828×355
wired
/
item Model HDU-42CF03/H
5.0
5×2.5mm2
Total power input
Max. power input
Running /Max.Running
Centrifugal × 1
0.156
6000
TP2M / 9.52x0.36
Outdoor unit
HDU-42HF03/H
(
INDOOR
)
（WHITE）
Weight (Net / Shipping) 62/77
Panel
Dimension 1008×830×480
1130×930×490
2 1.65
cooling: 43~60 / heating: 6~7
Heat exchanger TP2M / 9.52x0.36
PIPING
R22/3150
/
Pipe 9.52
19.05
Flared
Between I.D &O.MAX.Drop 30
MAX.Pi
p
in
g
len
g
th 50
Weight (Net / Shipping) 75/85
Type of Four way valve /
/
Defrosting Automatic
/
Axial × 1
JT160BCBY1L DAKIN
/
/
硬启动
内置保护器
/
Capillary tube
Refrigerant
/
/
55/52/47
/
64
740±50
SCROLL
Fan
Heat exchanger
Fan
Dimension
Compressor
Weight (Net / Shipping)
Dimension

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
9
Function cooling heating
Capacity BTU/h 41000 44000
Capacity kW 12 13
Sensible heat ratio 75% /
W4700 4850
W5200 5600
EER or COP W/W 2.55 2.68
Dehumidifying capacity 10‐³×m³/h
Power cable section
Signal cable section
Connecting cable section
Wired control cable for wired control unit section //
Power source N, V, Hz
A / A
Start Current A
Class of anti electric shock II
Circuit breaker A 30 30
Max. operating pressure of heat side Mpa 2.8 2.8
Max. operating pressure of cold side Mpa 2.8 2.8
Unit model (color)
Type × Number
Speed(H-M-L) r/min
Fan motor output power kW
Air-flow(H-M-L) m³/h
Type / Diameter mm
Total Area m²
Temp. scope ℃
External （L×W×H）mm×mm×mm
Package （L×W×H）mm×mm×mm
Air sending angle //
Drainage pipe (material , I.D./O.D.) mm
Control type (Remote /wired /model)
Fresh air hole dimension mm
Outlet distribution hole dimension mm
kW
dB(A)
kg / kg
External （L×W×H）mm×mm×mm
Package （L×W×H）mm×mm×mm
kg / kg
Unit model (color)
Model / Manufacture
Oil model
Oil type
Oil charging
Type
Protection type
Starting method
Type × Number
Speed r/min
Fan motor output power kW
Air-flow(H-M-L) m³/h
Type / Diameter mm
Row / Fin pitch
Temp. scope ℃
External （L×W×H）mm×mm×mm
Package （L×W×H）mm×mm×mm
Drainage pipe (material , I.D./O.D.) mm
Refrigerant control method mm/mm
Volume of Accumulator L
Noise level dB(A)
material of reduce noise
crankcase heater power W
kg / kg
Type / Charge g
Recharge quantity g/m
Liquid mm
Gas mm
Connecting Method m
m
force start
SUNISO 4GSDID-K/DAPHNE SE56P
/
1500-1700
inset protector
item Model HPU-42HF03
Total power input
Max. power input
5.0
5×2.5mm2
3，380-400，50
6×0.75mm2
Running /Max.Running cooling 8.5/9.3 heating8.8/9.6
50
Indoor unit
HPU-42HF03(INDOOR)（WHITE）
Fan
Centrifugal × 1
590±30/400±40/350±50
0.15
1560
Heat exchanger TP2M / 9.52x0.36
/
cooling: 43~60
Dimension 1820×530×310
1900×620×415
/
REMOTE
/
/
Electricity Heater /
Noise level (H-M-L) 56/46/40
Weight (Net / Shipping) 60/64
Panel
Dimension /
/
Weight (Net / Shipping) /
Outdoor unit
HPU-42HF03(OUTDOOR)（WHITE）
Compressor
JT160BCBY1L DAKIN
SCROLL
Fan
Axial × 1
740±50
0.156
6000
Heat exchanger TP2M / 9.52x0.36
2 1.65
cooling: 43~60 / heating: 6~7
Dimension 1006×825×410
1130×930×490
/
Capillary tube
Defrosting Automatic
/
59
Type of Four way valve /
/
/
Weight (Net / Shipping) 80/90
PIPING
Refrigerant R22/3150
/
Pipe 9.52
19.05
Flared
Between I.D &O.MAX.Drop 30
MAX.Piping length 50
Norminal condition: indoor temperature (cooling): 27℃DB/19℃WB, indoor temperature (heating): 20℃DB
Outdoor temperature(cooling): 35℃DB/24℃WB, outdoor temperature(heating): 7℃DB/6℃WB
The noise level will be measured in the third octave band limited values, using a Real Time Analyser calibrated sound intensity meter. It is a
sound pressure noise level.

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
10
Note: ⊙is the real time
analyser position
duct unit without auxiliary duct: duct unit with auxiliary duct:
outdoor unit:
1.air outlet from side: the noise level is the average sound pressure level measured from front, left, right directions.
2.air outlet from top: the noise level is the average sound pressure level measured from front, back, left, right directions.
measured point:
H ( height to the ground) = (h (unit height) + 1m) /2
and, it is 1m to each side.
Installation state: the unit should be placed on the flat floor or be mounted in horizontal direction.
Testing method:
standing-on-floor unit: If the unit cooling capacity is
over 28000W, the noise level should be measured at
the front, left, right directions respectively. built-in-ceiling unit:
1m
1m
1.4m
2m
duct
auxiliary duct
2m
1.4m
1m
auxiliary duct
h
1m
1m
1m
1m
1.4m

3. Safety precaution of indoor and outdoor
Carefully read the following information in order to operate the airconditioner correctly.
Below are listed three kinds of Safety Cautions and Suggestions.
WARNING!
CAUTION! Incorrect operations may result in injuries or machine damages; in some cases may
cause serious consequences.
Incorrect operations may result in severe consequences of death or serious injuries.
IN TRUCTION : These information can ensure the correct operation of the machine.
Be sure to conform with the following important Safety Cautions.
The afety Cautions should be at hand so that they can be checked at any time when needed.
If the conditioner is transferred to the new user this manual should be as well transferred to the new user.
WARNING!
If any abnormal phenomena is found
(e. g.smell of firing), please cut off the
power supply immediately, and contact
the dealer to find out the handling
method.
Don't dismantle the outlet of the
outdoor unit.
The exposure of fan is very dangerous
whichmay harm human beings.
switch
off
In such case to continue using the
conditioner will damage the conditioner
and may cause electrical shock or fire
hazard.
Incorrect maintenance and repairment
may cause water leak electrical shock
and fire hazard.
When need maintenance and repairment,
call dealer to handle it.
After a long time use of air-conditioner
the base should be checked for any
damages.
If the damaged base is not repaired the
unit may fall down and cause accidents.
Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
11

Air-conditioner can't be installed in
the environment with inflammable
gases because the inflammable gases
near to air-conditioner may cause fire
hazard.
Connect earthing wire.
Use discharge pipe correctly to ensure
efficient discharge.
Earthing wire should not be con-
nected to the gas pipe water pipe
lightning rod or phone line in-correct
earthing may cause shock.
Incorrect pipe use may cause water
leaking.
Earthing
WARNING!
Installed electrical-leaking circuit
breaker.
It easily cause electrical shock without
circuit breaker.
Please let the dealer be responsible for
installing the conditioner.
Incorrect installation may cause water
leak electrical shock and fire hazard.
Call the dealer to take measures to
prevent the refrigerant from leaking.
If conditioner is installed in a small
room be sure to take every measure in
order to prevent suffocation accident
even in case of refrigerant leakage.
When conditioner is deinstalled or
reinstalleddealer should be responsible
for them.
Incorrect installation may cause water
leaking electrical shock and fire hazard.
No goods or nobody is permitted to
placed on or stand on outdoor unit.
The falling of goods and people may
cause accidents.
Don't operate the air-conditioner with
damp hands.
Otherwise will be shocked.
Only use correctly-typed fuse.
May not use wire or any other materials
replacing fuse other-wise may cause
faults or fire accidents.

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
13
4. Net dimension of indoor and outdoor
HBU-18CF03

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
14
HDU-42CF03/H
410
Power wiring terminal
20
20
60
1006
70
180
447
825
>300
180
>150
646
>100
>100
>600

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
15
HPU-42HF03
410
Power wiring terminal
20
20
60
1006
70
180
447
825
>300
180
>150
646
>100
>100
>600
20/
0//
0//
42/
051/
+NN,
3/
PQSRT
E J;F FIC H?B;F >;7H;F
C. <<

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
16
5. Installation instructions
5.1 Outdoor unit
"Edging" for protection of electric wires from an opening edge.
Selection of the place of installation
Select the place of installation satisfying the following conditions and,
at the same time, obtain a consent from the client or user.
Place where air circulates.
Place free from heat radiation from other heat sources.
Place where drain water may be discharged.
Place where noise and hot air may not disturb the neighborhood.
Place where there is not heavy snowfall in the winter time.
Place where obstacles do not exist near the air inlet and air outlet .
Place where the air outlet may not be exposed to a strong wind.
Place surrounded at four sides are not suitable for installation. A 1m or more of overhead space is
needed for the unit.
Mount guide-louvers to place where short-circuit is a possibility.
When installing several units, secure sufficient suction space to avoid short circuiting.
(1) Open space requirement around the unit
Note :
(1). Fix the parts with screws
(2). Don't intake the strong wind directly to
the outletair-flowhole.
(3). A one meter distance should be kept
from the unit top
(4). Don't block the surroundings of the
unit with sundries

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
17
(2) Installation where the area with strong winds.
Install the unit so that the air outlet section of the unit must NOT be faced
toward wind direction.
Installation
Fix the unit in a proper way according to the condition of a place where it is installed by referring to the
following .
(1) Installation
Note: Give enough room for the concrete
foundation to fix by anchor bolts. Note: Place the concrete foundation deep
enough.
Install the unit so that the angle of inclination must be less than 3 degrees.
(2) Installation sketch of outdoor unit
HBU-18CF03

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
18
HDU-42CF03/H HPU-42HF03
Refrigerant piping
(1) Outline piping
(2) Piping size
Liquid pipe Φ6.35x0.8mm
HBU-18CF03 Gas pipe Ф12.7x1.0mm
Liquid pipe Ф9.52x0.8mm
HDU-42CF03/H Gas pipe Ф19.05x1.0mm
Liquid pipe Ф9.52x0.8mm
HPU-42HF03 Gas pipe Ф15.88x1.0mm

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
19
97.2-118.6N.m
Precautions for refrigerant piping
Do not twist or crush piping.
Be sure that no dust is mixed in piping.
Bend piping with as wide angle as possible.
Keep insulating both gas and liquid piping.
Check flare-connected area for gas leakage.
Connecting method (indoor unit)
Apply refrigerant oil at half union as large and flare nut.
To bend a pipe, give the roundness as possible not to crush
the pipe.
When connecting pipe, hold the pipe centre to centre then
screw nut on by hand, refer to Fig.
Be careful not to let foreign matters, such as sands enter
the pipe.
Piping connection
Forced fastening without centering
may damage the threads and cause
a gas leakage.
Pipe diameter Fastening torque
Liquid pipe 6. 5mm
Gas pipe 15.88mm
Liquid pipe 9.52mm
Gas pipe 19.05mm
14.2-17.2N.m
61.8-75.4N.m
2.7- 9.9N.m
Gas pipe 12.7mm 49.5-60. N.m
After finishing connection of refrigerant pipe, it shall perform air tightness test.
The air tightness test adopts nitrogen tank to give pressure according to the pipe connection
mode as the following figure shown.
The gas and liquid valve are all in close state. In order to prevent the nitrogen entering the
circulation system of outdoor unit, tighten the valve rod before giving pressure (both gas
and liquid valve rods).
Outdoor
Completely tightened
Completely tightened
Flare part
Outdoor units
Mainhole
Discharging valve
-way valve totally closed
(Gas side)
Low pressure gauge
High pressure gauge
Meter separator
Dropping valve
2-way valve totally closed
(Liquid side)
Nitrogen tank
VLVH
Indoor units
Indoor
Flare part
Air discharging method

Commercial Air Conditioner Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
20
It shall use the vacuum pump of (lower than -755mmHg)high vacuum degree and large air
discharging (over 40l/min).
The vacuumizing time depends on the length of the connecting pipe, generally is 1~2 hours.
When vacuumizing, it shall be confirmed both gas and liquid side valves are closed.
If after 2 hours vacuumizing, it cannot reach the vacuum degree below -755mmHg, it can be
vacuumized for other 1 hour.
If after hours vacuumizing, it still cannot reach the vacuum degree below -755mmHg, check
if there is any leaking point and repair the them.
First step: 0. MPa ( .0kg/cm2g) pressurize over minutes.
Second step: 1.5Mpa (15kg/cm2g) pressurize over minutes. Large leakage will
be found.
Third step: .0 MPa ( 0kg/cm2g) pressurize about 24 hours. Little leakage will be
found.
From the first to third steps, if the pressure drops, check the leakage in each joint
by the sense of hearing, feeling or soap water, etc. to find the leaking point.
After confirming the leaking point, welding it again or tighten the nut tightly again.
Checking the leaking point
After pressurizing for 24 hours, each 1 C difference of ambient temperature
will result in 0.01MPa(0.1kg/cm2g) pressure change. It shall be corrected during test.
Check if the pressure drops
If the pressure does not drop, the unit is passed
If the pressure drops, please check the leaking point.
Use vacuum pump to perform vacuumizing. It is strictly forbidden to use the
refrigerant to remove the air inside the system.
After air tightness test and discharging all the nitrogen, connect the vacuum pump
as the following figure shown.
Piping and indoor unit vacuumizing
2-way valve totally closed
(Liquid side)
Indoor units
Indoor Outdoor
Completely tightened
Completely tightened
Outdoor units
Vacuum pump
Discharging valve
-way valve totally closed
(Gas side)
Low pressure gauge High pressure gauge
Meter separator
V L VH
Flare part
Flare part
P