Hisense AVWW-28UCSA Instruction Manual

Installation
&
Maintenance
Manual
INVERTER-DRIVEN
MULTI-SPLIT
(HEAT PUMP)
AIR CONDITIONER
WATER-SOURCE
220-240V /50HZ
220V /60HZ
RATED POWER SUPPLY
AVWW - 28UCSA
MODEL
～
～
- Outdoor Units -
AVWW - 38UCSA
AVWW - 48UCSA
AVWW - 54UCSA
AVWW - 28U2SA
AVWW - 38U2SA
AVWW - 48U2SA
AVWW - 54U2SA
P 0 0 4 6 7 Q
ORIGINAL INSTRUCTIONS

Hisense
Hisense
Hisense
Water-source
Water-source
32DB/23WB 21DB/15WB
45 10
27DB 15DB
45 10
The water temperature range for reliable cooling operation is 15 above. The air conditioner may shutdown
~
during cooling operation while the water temperature is 10 15 , as the indoor-unit output is too small or
the water temperature is too low.

SAFETY SUMMARY
Use refrigerant R410A in the refrigerant cycle. Do not charge oxygen, acetylene
or other flammable and poisonous gases into the refrigerant cycle when performing a
leakage test or an air-tight test. These types of gases are extremely dangerous and
can cause an explosion. It is recommended that compressed air, nitrogen or
refrigerant be used for these types of tests.
Do not pour water into the indoor or outdoor unit. These products are equipped with
electrical parts. If poured, it will cause a serious electrical shock.
Do not touch or adjust safety devices inside the indoor or outdoor units. If these
devices are touched or readjusted, it may cause a serious accident.
Do not open the service cover or access panel for the indoor or outdoor units without
turning OFF the main power supply.
Refrigerant leakage can cause difficulty with breathing due to insufficient air. Turn OFF
the main switch, extinguish any naked flames and contact your service contractor, if
refrigerant leakage occurs.
The installer and system specialist shall secure safety against refrigerant leakage
according to local regulations or standards.
Use an ELB (Electric Leakage Breaker). In the event of a fault, there is danger of an
electric shock or a fire if it is not used.
Do not install the outdoor unit where there is a high level of oil mist, flammable gases,
salty air or harmful gases such as sulphur.
Do not use any sprays such as insecticide, lacquer, hair spray or other flammable
gases within approximately one (1) meter from the system.
If circuit breaker or fuse is often activated, stop the system and contact your service
contractor.
Do not perform installation work, refrigerant piping work, drain piping and electrical
wiring connection without referring to our installation manual. If the instructions are
not followed, it may result in a water leakage, electric shock or a fire.
Check that the ground wire is securely connected. If the unit is not correctly grounded,
it lead electric shock. Do not connect the ground wiring to gas piping, water piping,
lightning conductor or ground wiring for telephone.
Connect a fuse of specified capacity.
Do not put any foreign material on the unit or inside the unit.
Make sure that the outdoor unit is not covered with snow or ice, before operation.
Before performing any brazing work, check to ensure that there is no flammable
material around.
When using refrigerant be sure to wear leather gloves to prevent cold injuries.
Protect the wires, electrical parts, etc. from rats or other small animals.
If not protected, rats may gnaw at unprotected parts and which may lead to a fire.
Fix the cables securely. External forces on the terminals could lead to a fire.

Children should be supervised they do not play with the appliance.
their safety.
supervision or instruction concerning use of the appliance by a person responsible for
or mental capabilities,or lack of experience and knowledge, unless they have been given
The appliance is not to be used by children or person with reduced physical, sensory
c. The outdoor unit will not fall down due to a strong wind or earthquake.
Do not install the indoor unit, outdoor unit, remote control switch and cable within
approximately 3 meters from strong electromagnetic wave radiators such as medical
equipment.
Supply electrical power to the system to energize the oil heater for 12 hours before
start-up after a long shutdown.
Do not step or put any material on the product.
Provide a strong and correct foundation so that;
a. The outdoor unit is not on an incline.
b. Abnormal sound does not occur.
NOTE:


SAFETY SUMMARY
OIt is recommended that the room will be ventilated every 3 to 4 hours.
Regarding installation altitude below 1000m;
Regarding frequency of supply power within ±1%Hz of rated frequency;
Regarding transport / storage temperature within -25~55°C.

Hisense s liability shall not cover defects arising from the alteration performed by a customer without
CHECKING PRODUCT RECEIVED
Upon receiving this product, inspect it for any shipping damage.
Claims for damage, either apparent or concealed, should be filed immediately with the shipping
company.
Check the model number, electrical characteristics (power supply, voltage and frequency) and
accessories to determine if they are correct.
The standard utilization of the unit shall be explained in these instructions.
Therefore, the utilization of the unit other than those indicated in these instructions is not recommended.
Please contact your local agent, as the occasion arises.
Hisense s consent in a written form.
’’
’
’
Correct Disposal of this product
This marking indicates that this product should not be disposed with other
household wastes. To prevent possible harm to the environment or human
health from uncontrolled waste disposal, recycle it responsibly to promote the
sustainable reuse of material resources. To return your used device, please use
the return and collection systems or contact the retailer where the product was
purchased. They can take this product for environmental safe recycling.

8. Safety and Control Device Setting............................................................................................27
............23
6.2 Electrical Wiring Connection............................................................................................19
..........18
5.6 Branch Pipe for Line Branch............................................................................................17
5.5 Refrigerant Piping Work...................................................................................................15
.... 14
5.3 Stop Valve........................................................................................................................13
5.2 Piping Connection............................................................................................................ 7
.6
.. 6
....5
.......4
..........4
3.2 Transportation...................................................................................................................3
... 3
.... 3
2.2 Necessary Tools and Instrument List for Installation........................................................ 1
TABLE OF CONTENTS
1. Safety Summary....................................................................................................................... 1
2. Structure................................................................................................................................... 1
2.1 Outdoor Unit & Refrigerant Cycle .................................................................................... 1
3. Transportation and Handling ................................................................................................
3.1 Combination of Indoor Unit and Outdoor Unit..................................................................
4. Outdoor Unit Installation..................................................................................................
4.1 Initial Check...............................................................................................................
4.2 Installation Work...........................................................................................................
5. Refrigerant and Water Piping Work........................................................................................
5.1 Piping Materials...............................................................................................................
5.4 Additional Refrigerant Charge Calculation...................................................................
6. Electrical Wiring..............................................................................................................
6.1 General Check.................................................................................................................18
7. Test Run.......................................................................................................................
6.3 Dip Switch Setting of Outdoor Unit ..................................................................................22
9. Maintenance..............................................................................................................................28

1. Safety Summary
2. Structure
Please refer to technical manual
2.2 Necessary Tools and Instrument List for Installation
No. Tool No. Tool No. Tool No. Tool
1 Handsaw 6 Copper Pipe Bender 11 Spanner 16 Leveller
2
Screwdriver 7Manual Water Pump 12 Charging Cylinder 17 Clamper for Solder-
less Terminals
3 Vacuum Pump 8 Pipe Cutter 13 Gauge Manifold 18 Hoist
(for Indoor Unit)
4Refrigerant Gas
Hose 9 Brazing Kit 14 Cutter for Wires 19 Ammeter
5 Megohmmeter 10 Hexagon Wrench 15 Gas Leak Detector 20 Voltage Meter

Use tools and measuring instruments only for the new refrigerant which is directly touch to refrigerant.
: Interchangeability is available with current R22 : only for Refrigerant R410A (No Interchangeability with R22)
: Prohibited : only for Refrigerant R407C (No Interchangeability with R22)
R410A R407C
Pipe Cutter
Chamfering Reamer  -Cutting Pipe
Removing Burrs
Flaring Tool  * The flaring tools for R407C are applicable to R22. Flaring for Tubes
* If using flaring tube, make dimension of tube
larger for R410A.
* In case of material 1/2H, flaring is not available.
Pipe Bender 
* In case of material 1/2H, bending is not available.
Use elbow for bend and braze.
Bending
Expanding Tool 
* In case of material 1/2H, expanding of tube is not
available. Use socket for connecting tube.
Expanding Tubes
*For
q
12.7
,
q
15.88
,
s
p
anner size is u
p
2mm.

*For q6.35, q9.53, q19.05, spanner size is
the same.
Brazing Tool * Perform correct brazing work. Brazing for Tubes
Nitrogen Gas 
* Strict Control against Contamin
(Blow nitrogen during brazing.)
Prevention from
Oxidation during
Brazing
Lubrication Oil
(for Flare Surface)
* Use a synthetic oil which is equivalent to the oil
used in the refrigeration cycle.
Applying Oil to the
Flared Surface
* Synthetic oil absorbs moisture quickly.
* Check refrigerant cylinder color. Refrigerant Charging
Liquid refrigerant charging is required regarding
zeotoropic refrigerant.
Vacuum Pump 
Vacuum Pumping
Adapter for
Vacuum Pump 
Manifold Valve 
* No interchangeability is available due to higher
pressures when compared with R22.
Charging Hose 
Do not use current ones to the different refrigerant.
If used, mineral oil will flow into the cycle and cause
sludges, resulting in clogging or compressor failure.
Connection diameter is different; R410A: UNF1/2,
R407C: UNF7/16.
Charging Cylinder * Use the weight scale. -
Weight Scale  -
Measuring
Instrument for
Refrigerant Charging
Refrigerant Gas
Leakage Detector 
* The current gas leakage detector (R22) is not
applicable due to different detecting method.
Gas Leakage Check
: Interchangeability with R407C.
Vacuum Pumping,
Vacuum Holding,
Refrigerant Charging
and Check of
Pressures


Measuring Instrument and Tool
Interchangeability
with R22 Reason of Non-Interchangeability and Attention
(: Strictly Required)
Torque Wrench
Vacuum
Drying
.
Refrigerant
Charge
Refrigerant
Cylinder
The current ones are applicable. However, it is
required to mount a vacuum pump adapter which
can prevent from reverse flow when a vacuum
pump stops, resulting in no reverse oil flow.
Use
Refrigerant
Pipe
Extrusion
Adjustment Gauge -
Connection of
Flare Nut
Dimensional Control
for Extruded Portion
of Tube after Flaring




3. Transportation and Handling
3.1 Combination of Indoor Unit and Outdoor
Unit
The following indoor units can be combined
with the outdoor unit
Table.3.1 Indoor Unit Type List
Indoor Unit
Ceiling Ducted Type
Ceiling Ducted Type
Low-Height
Slim Ceiling Ducted Type
4-Way Cassette Type
Wall-Mounted Type
Floor-Concealed Type
Rated Capacity (KBtu/h)
07 09 12 14 17 18 22 24 27 30 38 48 54
Allow
Indoor Unit total Capacity must be 50% to 130% for
Outdoor Unit Rated Capacity
Table 3.2 System Matching
Outdoor Unit Model
Capacity(KBtu/h)
28
38
48
54
Rated Capacity(KBtu/h)
Capacity
Min. Matching
(KBtu/h)
Max. Matching
Capacity
(KBtu/h)
Min. Single
Operate Capacity
Quantity
Matching
(KBtu/h)
to
to
to
to
14
18
24
27
36
47
62
70
07
07
07
07
3.2 Transportation
Transport the product as close to the installation
location as practical before unpacking.
Do not put any material on the product.
Apply two lifting wires onto the outdoor unit,
when lifting it by crane.
Hanging Method
When hanging the unit, ensure a balance of
the unit, check safety and lift up smoothly.
(1) Do not remove any packing materials.
(2) Hang the unit under packing condition with
two (2) ropes, as shown in Fig. 3.1.
Fig. 3.1 Hanging Work for Transportation
If have no package to move,Please protect with
cloth or paper
Fig.3.2 Transportation for no wooden base
Put Cloth or Paper
Net Weight
Outdoor Unit Model
(KBtu/h)
28
38~54
Do not put any foreign material into the
outdoor unit and check to ensure that none
exists in the outdoor unit before the
installation and test run. Otherwise, a fire or
failure, etc. may occur.

4. Outdoor Unit Installation
4.1 Initial Check
Install the outdoor unit with a sufficient space
around the outdoor unit for operation and
maintenance as shown in Fig. 4.1.
Rear Side
Front Side
Space for Maintenance
and Ventilation
Space for Maintenance
and Ventilation
Upper Maintenance Space
Fig. 4.1 Space for Installation and Maintenance
Check to ensure the foundation is stable and firm.
The outdoor unit must be installed in the special
room that is dry and soundproof.
Install the outdoor unit where the sound from the
outdoor unit does not affect neighbors.
Install the outdoor unit where it is in the shade
or it will not be exposed to direct sunshine or
radiation from high temperature heat soure.
Install the outdoor unit where the temperature
is 0 40 , the relative humidity is under 80 .
When outdoor unit installed in a closed room,
the vents should be set.
Do not install the outdoor unit where there is a
high level of oil mist, salty air or harmful gases
such as sulphur.
Do not install the outdoor unit where the
electromagnetic wave is directly radiated to the
electrical box.
Install the outdoor unit as far as practical, being
at least 3 meters from the electromagnetic wave
radiator.
Install the outdoor unit in a space with limited
access to general public.
Rear Side
Front Side
Fig. 4.2 Space for Installation and Maintenance
NOTE
Install the outdoor unit in an area where people
except service engineers can not touch the
outdoor unit.

4.2 Installation Work
(1) Secure the outdoor unit with the anchor bolts
and add 5mm or thicker washer between the
Max. 21mm
Anchor Bolt
Base of Outdoor Unit
Nut
Special Washer
Filled Mortar
Concrete M10
base of outdoor unit and the concrete.
Fig. 4.3 Installation of Anchor Bolts
(2) When installing the outdoor unit, fix the unit by
anchor bolts. Refer to Fig. 4.4 regarding the
location of fixing holes.
Unit: mm
Fig. 4.4 Position of Anchor Bolts
Hole for M10
Anchor Bolt
12.5
Compressor
(3) Install the outdoor unit in the front-rear and
right-left direction horizontally. Check to ensure
that the gradient in four directions (front, rear,
right, left) is within 10mm.
(4) Provide a strong and correct foudation so that:
a) The outdoor unit is not declined.
b) Abnormal sound does not occur.
c) The outdoor unit does not fall down due to
strong wind or earthquake.
(5) In case of the drain pipe is necessary for the
outdoor unit, use the drain kit ( 18mm) .
(6) The connection position of the water pipe
is shown in Fig. 4.5.
Unit: mm
Fig. 4.5 Position of water pipe connection

5. Refrigerant Piping Work
Use refrigerant R410A in the refrigerant cycle.
Do not charge oxygen, acetylene or other
flammable and poisonous gases into the
refrigerant cycle when performing a leakage
test or an air-tight test. These types of gases
are extremely dangerous and can cause an
explosion. It is recommended that
compressed air, nitrogen or refrigerant be
used for these types of tests.
5.1 Piping Materials
(1) Prepare locally-supplied copper pipes.
(2) Select the piping size from the Table 5.1.
(3) Select clean copper pipes. Make sure
there is no dust and moisture inside of the
pipes. Blow the inside of the pipes with
nitrogen or dry air, to remove any dust or
foreign materials before connecting pipes.
NOTE
Cautions for Refrigerant Pipe Ends
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Correct CorrectIncorrect Incorrect
Correct Incorrect
HoleHole
Attach a cap
or vinyl tape.
Attach a cap
or vinyl tape.
Attach a cap
or vinyl bag with
rubber band.
Do not place the pipe
directly on the ground.
Rain water can
enter.
Cap the end of the pipe when the pipe is to
be inserted through a hole.
Do not put pipes on the ground directly
without a cap or vinyl tape at the end of the
pipe.
Flaring Dimension
Perform the flaring work as shown below.
Diameter
Piping Thickness and Material
Use the pipe as below.
Thickness Material
Diameter
Material is based on a JIS standard (JIS B8607).
Flare Nut Dimension
Use the flare nut as below.
<Flare Nut Dimension B (mm)
Diameter R410A
Dimension is based on a JIS standard
(JIS B8607).
Flare Nut
Water Pipe Connection of Plate Heat Exchanger
UNI ISO 228/1-G1 B
（１″ ）
GAS
Φ２３
Φ３３．７
２０
２４
Thread of Water Pipe Connection on Plate
Heat Exchanger

Requirement for Water Inlet Filter (40 mesh
recommended)
Requirement for FIlter
Medium
Water
Nominal Pressure
NOTE
Filter must be installed on the water inlet pipe
of the unit in order to prevent the plate heat
exchanger from being blocked by impurities.
5.2 Refrigerant Piping Work
(1) Ensure that the directions for refrigerant piping
work according to the tables.
Table 5.1 Outdoor Unit Pipe Model
Outer Diameter of Pipe
Gas Liquid
Diameter
Branch Pipe
HFQ-052F
Capacity
(KBtu/h)
28
38
48
54
Table 5.2 Indoor Unit Pipe Model
Gas Pipe
Indoor Unit Capacity (KBtu/h) Liquid Pipe
07 ~ 14
17 ~ 18
22 ~ 54
Position of Connection Pipes to the Outdoor Unit
28 ~ 54
Outlet Water Pipe
Liquid Pipe
Gas Pipe
Intlet Water Pipe
Fig. 5.1 Position of Connection Pipes

Water Pipe Connection of the Outdoor Unit
(recommended)
Chart Name
Pressure Gauge
Water Inlet
Water outlet
Flexible Connector
Water Filter
Thermometer
Stop Valve
Control Valve
Flow Switch
Notes for Water Pipe Connection
(1) Notice the position of connection pipe, do not
connect inlet and outlet pipe reversely.
(2) Water filter must be installed on the unit (40
mesh recommended).
(3) Please check and ensure the water fillter is
installed near the unit side.
(4) Please select the water pipe according to local
or national regulation, besides, the size of water
should be no less than that of pipe joint on the
outdoor unit.
(5) Insulate water inlet and outlet pipe to avoid from
water condensating and freezing.
(6) Regularly clean the water filter according to the
degree of obstruction.
(7) Discharging all the water in heat exchanger and
pipe is suggested throughout the long duration
of stoppage in winter to prevent from freezing.
(8) Please check and clean the unit and accessories
in water system thoroughly before the initial startup
after long stoppage.
Essential Requirement for Water Pipe Connection
(1) Before installation, flush all water pipes thoroughly
to ensure no foreign material left in that. Be careful
(2) It is necessary to set a water flow switch on heat
exchanger water outlet to realize stop protection.
(3) There must be extra bracer to support pipe and
pipe joint which can not be supported by the unit.
(4) Connection pipe and pipe joint on heat exchanger
should be removed easily to make operation and
clean more convenient.
(5) It is necessary to install sluice valves on water inlet
and outlet of the unit to cut off the water flow in heat
(6) Heat exchanger and connection pipe should be
connected with fexible joint in order to lower vibration
(7) For easy inspection, thermometers and pressure
gauges should be settled on water inlet and outlet.
(The outdoor unit is not equipped with thermometers
(8) Drainage joints should be set on lower points in water
system to discharge water thoroughly. All higher points
should be installed with air exhaust valve in order to
not to flush any foreign material into the plate heat
exchanger.
Water flow switch should be connected to terminal
TB1 on PCB with shielded cable. Adjust setting
value of switch properly according to rated water
flow.
exchanger, so that there is no impact on the usage
of other units during maintenance.
spread and avoid piping crack.
and pressure gauges).
exhaust air in pipes. There is no need to insulate air
exhaust valve and drainage joint for easy maintainance.
(9) Insulate all water pipes that have possibility to be iced
up. Water pipe can be packed together with an auxiliary
heater band in order to avoid frost crack. The heater
power source should be equipped with individual fuse.
Fig. 5.2 Water Pipe Connection

PL PN FL FN
Connect water
Connect water pump flow switch
LN
Connect power
Water Flow Installation
(1) Terminals of water flow switch should be placed
in proper positon for easy wiring.
(2) The direction arrow marked on water flow switch
should be in accordance with the direction of
(3) Water flow switch must be installed in straight pipe
and the length of straight pipe between the two ends
(4) Water flow switch can be installed on horizontal
pipe-line or vertical pipe in which water flows
upward and can not be installed on vertical pipe
in which water flows downward.
(5) Water flow switch needs to be interlocked with
control system.
(6) Target paddle needs to selected and cut on site.
water flow, target paddle should be perpendicular
to the direction of water flow.
of water flow switch should be 5 times larger than
the pipe diameter.
Flow Direction
Fig. 5.3 Water Flow Swtich Installation
The dimension " " must be 5 times larger than the
diameter of the pipe from nearest elbow or valve to
other throttling place.
Wiring of Terminal TB1
Please wiring as the following table, otherwise, it will
cause the damage of PCB.
Terminal Control Object
Signal Output
of Pump
Signal Input
of Flow Switch
Demand
Wiring Connection of Flow Switch
Water flow switch is the component for avoiding damage
caused by flow reduction. TB1-FL, FN of the unit is signal
input of flow switch.
water flow switch
Fig. 5.4 Water Flow Swtich Wiring
The connecting line between TB1 and water flow
switch should be wired near the unit and as short as
possible.

Wiring of Water pump
The running signal of water pump can be sent through
terminal TB1-Pl, PN of the unit.

'R QRW FRQQHFW SXPS RXWSXW VLJQDO RI VHYHUDO
XQLWVLQSDUDOOHOZKLFKPD\FDXVHWKHGDPDJHRI
FRQWUROERDUG
Power Source
AC Contractor
Pump
Fig. 5.5 Wiring of Pump
Water Treatment
Units are recommended to be used in the situation with
circulating water cooling tower, especially closed cooling
tower.
Water pipes and plate heat exchanger that are used in
the place with open cooling tower and poor quality water
would be faced with corrosion or sediment, therefore,
water-line constuction, water-quality monitoring and water
treatment is necessary.
(1) Make sure that any scale inhibitor or preservative will
not corrode stainless steel or copper product with water
treatment company.
(2) Please refer to Water-quality Requirement (JRA-GL-
02-1994) released by Japan Refrigeration and Air
Conditioning Industry Association for water-management
and benchmark. Reference Value Table for middle-lower
temperature water is applicable for this unit.
Water filter must be installed, otherwise, water
scale and impurities will damage heat exchanger
and water pipes. Installer and user must ensure
circulating water quality and no air in water
system to prevent the steel parts of heat
exchanger from being oxidized by air.
Table. 5.3 Water Quality Requirement (Reference)
Item
Water
Recycle Water Supplemental
Water Corrosion Scale
Tendency
Conductivity
Cl
SO
Acid
Total Hardness
Ca Hardness
Fe
Cu
S
Cl
CO
Stability Index
Standard ItemReference Item
Not detectable Not detectable
3OHDVHWXUQRQWKHWKLUGNH\RI'6:ZKHQQRW
XVLQJWKHVLJQDORI3/DQG31FRQWUROSXPS


Refrigerant Piping Connection
(1) Confirm that the valve is closed.
(2) Prepare various of field-supplied pipes and
elbows. Perform soldered connection according
to operating requirements.
(3) For pipe connection on stop valves, tightening
work should be done with double spanner.
Double Spanner Work Tightening Work for Stop Valve
Do not apply the double
spanner work here.
Refrigerant leakage shall
occur.
Pipe Size Torque
Table. 5.4 Tightening Torque for Flare Nut
C
heck to ensure that
Check to ensure that no pressure increase is
observed one hour after vaccum pumping
completion.
Water Piping Connection
Fig. 5.6 Water Piping Connection
(1) Connect water pipes with spanner and the torque
(2) Please clean the contact surface, remove grease
and add chlorate fluxes while welding copper pipe
in maintenance. Silver solder with silver
(3) The maximum flame temperature in welding is
. Nitrogen should be filled inside the refrigerant
is .
should be used for welding.
side to prevent oxidation.

Refrigerant evacuation and charging procedure should
be performed according to the following instructions and
Fig. 5.8.
(1) Although the stop valve has been closed before
shipment, check to ensure the stop valve is closed
before installation.
(2) Connect the indoor and outdoor unit with field-supplied
refrigerant piping. Suspend the refrigerant piping at
certain point to prevent them from touch some parts of
the building such as wall, ceiling, etc.
( If touched, abnormal sound may occur due to the
vibration of the piping. Pay special attentiion in case of
short piping length) .
(3) Connect the mani-fold gauge and the vacuum pump
or nitrogen cylinder to the check joints of the liquid line
and the gas line stop valves, using charging hoses.
the building such as wall, ceiling, etc.
Connect the mani-fold gauge to the check joints of the
liquid and gas stop valves in the outdoor unit. Perform
the air-tight test with the stop valves closed and the test
pressure of nitrogen gas is 4.15MPa.
(4) Check for any gas leakage at the flare nut connection,
or brazed parts by gas leakage tester or foaming agent.
Completion
of Ref.
Piping
Repairing
of Leakage
Part
Check of
Pressure
Decrease
Applying
Nitrogen
Gas
Pass
Procedure
(5) Connect the mani-fold gauge to the check joints at the
both sides.
Continue vacuum pumping work until the pressure
reaches 756mmHg or lower for one or two hours.
After vacuum pumping work , close the valve of mani-
fold gauge, stop the vaccum pump and keep it for
one hour. Check to ensure that the pressure showed on
the mani-fold gauge does not increase.
(6) For charging refrigerant, connect the mani-fold gauge
with a refrigerant charging cylinder to the check joint of
the liquid line stop vlave, using charging hoses.
(7) Fully open the gas line stop valve and slightly open the
liquid line stop valve.
(8) Charge refrigerant by opening the valve of mani-fold
gauge.
(9) Charge the required refrigerant with the difference range
of 0.5Kg by operating the system in cooling.
(10) Fully open the liquid line stop valve after completing
refrigerant charge.
(11) Continue cooling operating for more than 10 minutes to
circulate the refrigerant.