Toshiba WAM600AR-SV-8 User manual

Installation & Operations Manual
Toshiba Condensing Unit
Inverter-condensing unit for outdoor
Model name:
WAM600AR-SV-8
• Thank you for choosing to purchase a Toshiba
condensing unit.
• Please carefully read and fully understand this manual
before designing and installing the product in order
to use the equipment with this product safely and
properly.
• Be sure to keep this manual in an easily accessible
location for future reference.
Contents
●Introduction...............................................1
1.Safety precautions ............ 2
2. Component names and functions.............5
3. Specifications ...........................................8
4. Safety instructions ..................................10
5. Installation work......................................11
6. Pipe work................................................16
7. Pressure testing .....................................19
8. Service valve operation ..........................20
9. Instructions for vacuum creation and
refrigerant charging ................................21
10.Inverter control selection and control
overview .................................................23
11.Electrical wiring ......................................24
12.Test operation and setting methods .......28
13.Error display and resolution methods.....35
14.Saturation pressure display
(reference)..............................................36
15.Maintenance precautions .......................36
16.Data displays..........................................37
17.Precautions when handling and installing
the condensing unit ................................41
18.Refrigerant leak inspection.....................42

1
Before installation
During installation
Pipe work
Pressure testing
Service valve operation
Vacuuming
Refrigerant charging
Operation
Electrical wiring
Maintenance and
inspection
This instruction manual is written in the order of installation work procedures.
Be sure to read this manual and check the correct pages as needed for work details.
Introduction
1.Safety precautions ............ 2
2. Component names and functions.............5
3. Specifications ...........................................8
4. Safety instructions ..................................10
5. Installation work......................................11
6. Pipe work................................................16
7. Pressure testing .....................................19
8. Service valve operation ..........................20
9. Instructions for vacuum creation and
refrigerant charging ................................21
10.Inverter control selection and control
overview .................................................23
11.Electrical wiring ......................................24
12.Test operation and setting methods .......28
13.Error display and resolution methods.....35
14.Saturation pressure display
(reference)..............................................36
15.Maintenance precautions .......................36
16.Data displays..........................................37

2
1. Safety precautions
• Before using the condensing unit, carefully read these safety precautions for information on proper
usage.
• Be sure to always follow these safety precautions, as they contain important safety information.
• Toshiba Carrier bears no responsibility for damages resulting from failure to follow these instructions.
• To ensure safe and proper usage, ensure that the end user (the person actually using the condensing
unit) has access to the Operating Precautions and the Moving and Repair Notes, and receives
sufficient explanations.
• The displayed symbols are explained below.
WARNING Indicates a possibility of death or grave bodily harm to persons if handled
incorrectly.
CAUTION Indicates that mishandling may cause bodily*1 harm to persons, or may cause
physical*2 damage.
*1: Bodily injury indicates injury, burns, electric shock, and other injuries which do not require
hospitalization or long-term treatment as an outpatient.
*2: Physical damage indicates a large-scale damage affecting property and materials.
Explanation of symbols
Indicates prohibited items (things that must never be done).
The specific prohibited action is indicated by a pictograph or text placed inside or
next to the symbol.
Indicates mandatory items (things that must always be done).
The mandatory action referred to is indicated by a pictograph or text placed inside
or next to the symbol.
Installation Precautions
WARNING
Perform
installation
work
properly
Installation work must be performed
properly in accordance with this
instruction manual
Carefully
choose the
installation
site
Installation must be performed properly
at a carefully selected site sufficiently
equipped for the product load
Inadequate installation may cause oxygen
deficiency due to refrigerant leaks, electric
shocks, and fires.
If the strength of the installation site is not
enough or the installation is incomplete, the
condensing unit may fall down resulting in
injury.
Connect to
ground
Grounding connection must be installed
by the electrician
Setting values
must not be
changed
Do not change the setting values for
the protective devices used with the
condensing unit
Improper grounding may result in electric
shock.
Changing the setting values may cause rupture
and fires.
Non-
designated
refrigerants
are prohibited
Non-designated refrigerants may not be
used in the refrigeration cycle, and air
must not be mixed therewith
Perform
airtight
testing
After pipe installation, perform pressure
testing
Combination with air may cause abnormally
high pressure and temperature in the
refrigeration cycle, resulting in risks of rupture
and fire.
Refrigerant leaks may cause oxygen deficiency.

3
... Installation Precautions (continued)
WARNING
Ventilate
If refrigerant leakage occurs during
operation, ventilate
Check for
refrigerant
leakage
Once installation work is complete,
check for any refrigerant leakage
If leaked refrigerant comes into contact with
fire, harmful gases may be produced and may
cause harm.
When refrigerant leaks indoors, contact with fire
from a fan heater, stove, kitchen range, and so
on may produce harmful gases and may cause
harm.
Open the
valve
Before starting operation, open both service valves
When the service valves are not open, abnormally high pressure and temperature in the refrigeration
cycle occur, resulting in risks of rupture and fire.
CAUTION
Instructions
Wear gloves during installation (*)
Prohibited
Do not select an installation site where
flammable gas may leak
Failure to observe this precaution may result in
injury from parts, etc.
(*thick gloves, such as cotton work gloves)
In the event that a gas leak occurs near the
condensing unit, there is a risk of fire.
Install a
leakage
interruptor
Install a leakage interruptor
Prohibited
Do not install at a site having poor
circulation
Not installing a leakage interruptor may lead to
electric shocks.
The leakage interruptor is not included with the
condensing unit.
Oxygen deficiency may occur in the event of
refrigerant leakage.
Be careful
when opening
and closing
valves
Take care when opening and closing the
service valves
Follow the
specified
ranges
Make the refrigeration cycle within the
specified range for the condensing
unit
When the service valve is open, harm may
result from exposure to refrigerant or from
cooling gas coming into contact with open
flame.
Building the refrigeration cycle outside the
specified range may lead to rupture, smoke,
fire, and electric leakage.
Install a
cap
Always install a cap on the charging
outlet
Caulk the pipe
inlets and
outlets
Remove a portion of heat insulation
material around the pipe inlets and
outlets of the casing, and caulk the area
There is a risk of refrigerant leakage If the condensing unit catches fire, smoke
and fire may occur through the heat insulating
materials.

4
Operating Precautions
WARNING
Prohibited
Do not insert fingers or sticks into the
air inlets and outlets
Water
washing is
prohibited
Do not expose the product directly to
water, and do not use water for cleaning
The internal fans rotate very fast and may
cause injury. (Air-cooled models)
Doing so may cause electric shock or fire.
CAUTION
Do not
touch with
wet hands
Do not touch electronic components or
operate switches with wet hands
Turn off
the power
Always switch the power supply circuit
OFF for cleaning, adjustments, and
inspections
Doing so may cause electric shock. Electric shocks and injury from the fans may
result.
Flammable
materials
prohibited
Do not use flammable sprays near the
cooler, and do not place flammable
materials nearby
Do not stand,
climb, or sit
Do not climb, stand, or sit on the
condensing unit, and do not place
objects on it
Sparks from the switches may cause objects to
catch fire.
Dropping and falling over may cause injury.
Perform
regular
inspections
Perform regular inspections to check
for damage to installation over long-
term use
Prohibited
Do not touch pipes and wiring
If left in a damaged state, the condensing unit
could fall over or drop, which may lead to injury
Touching exposed pipes or wiring may cause
burns and electric shocks.
Prohibited
Do not touch the unit inlet or aluminium
fins
Do not
touch
Only the operator should touch the
condensing unit
Otherwise, injury may result. Surround the condensing unit with protective
gates if there is a risk of persons other than the
operator touching it.
Mishandling may lead to injury.
Moving and Repair Precautions
WARNING
Do not
disassemble
The condensing unit must never be
disassembled or repaired by persons
other than repair technicians and
specialists
Turn the
power OFF in
case of error
When an error occurs, stop operation
and switch the power supply OFF.
Contact your sales representative or
installer.
Faulty operation may lead to injury. Improper
repair may cause electric shock, fire, rupture,
injury, and water leakage.
Continued faulty operation may cause
electric shock and fire.
OFF
Instructions
Consult your sales representative or specialist for moving and repairs
Lack of specialist knowledge may lead to electric shock, fire, and rupture.

5
2. Component names and functions
Air inlet
Air outlet
LED window
Frontal cabinet
Pipe wiring outlet port (bottom)
Pipe wiring outlet port (side)

6
2. Component names and functions (continued)
SHC
OS
0
0
0
000
12341234 1234 12
312 4
RST
COM NONC65L2L1
Printed circuit
board
1. Error determinations
2. Special settings
3. Remote communication
4. Oil-back settings
Operation control
selection
Operational speed
selection
Cut-off pressure setting
Setting pressure
(low-pressure constant control)
Cut-in pressure setting
Cut-off pressure difference
(low-pressure constant control)
Pipe connection port (liquid)
Pipe connection port (gas)
Analog signal selection switch
This switch sets the type of analog signal.
Maximum operating speed setting switch
This switch sets the maximum operating speed for the
inverter.
Sets the operating speed for low-pressure differential
control and test operation mode.
Operating control setting switch
Sets the operating control method for the inverter.
(Set this switch before switching the power supply
ON. Cannot be switched during operation.)
Auxiliary control switch
Can set the number of retries until error determination,
special settings, external device communication, and
whether or not to use oil-back operation.
System setting switch
This switch sets the control system. This switch is pre-set upon leaving
the factory. Do not change the factory default.
Display setting switch
This switch can set and change LED display functions.
Cut-in pressure setting switch
This switch sets the cut-in pressure for low-pressure differential control.
When low-pressure constant control is used, this switch sets the
pressure difference with respect to the stopping pressure.
Operating pressure and cut-off pressure
setting switch
This switch sets the operating low-pressure value for low-pressure
constant control. Also sets the cut-off pressure when low-pressure
differential control is used.
Compressor delay duration reduction switch
This switch reduces the duration of the compressor restart delay by
causing a short. Should not be used during normal operation. (Use
only during checks, such as test operation)
Power supply terminals (L1, L2, L3, N)
Connect to a 380-415 V 3N~ (50 Hz) power supply.
Analog input terminals (7, 8)
Connect analog input signals (4 mA to 20 mA, 1 mA to 5 mA, 1 V to
5 V DC) if used for control.
Error reset terminals (9, 10)
These terminals can perform an error reset when shorted.
(may not always succeed in resetting, depending on the error type)
Remote operation / stop terminals (11, 12)
Start when shorted, stop when released. (can be used for emergency
stops, pump-out stops, and analog signal control stops)
Communication terminals (S1, S2, SG)
Connect a dedicated Toshiba controller, if used.
(Use a shielded wire of at least 0.3 mm2)
Solenoid valve power terminals (L, N)
Power supply (220-240 V AC) for a solenoid valve.
(Maximum capacity: 4 A or less)
Error output terminal (NC, NO, COM)
Used for no-voltage contact output during a condensing unit error.
(Maximum capacity: 220-240V AC, 4 A or less)
Defrost heater control terminals (5, 6)
Can provide a voltage-less connection if switched ON while the
compressor is stopped.
(Maximum capacity: 220-240 V AC, 4 A or less)
Display LEDs
Normally displays the discharge pressure (MPa) and intake pressure
(MPa).
Also displays error codes when errors occur.
Changing the display mode enables the operating frequency, various
operational data, and past error history to be displayed.
Controller selection switch
This switch is pre-set to the right-hand side upon leaving the factory.
Do not change the factory default.
*This model does not allow refrigerant selection setting.
Power switch
Can be switched OFF to force-stop the condensing unit.
*Note: The original power source is not interrupted. Exercise caution.
Operation switch
Can force-close the line solenoid valve via pump-down stop.
Grounding screw
Frontal cabinet removed

7
2.Attach the grounding line
1.High voltage circuit is Avoid holding the lead section
Compressor terminal box internal
wiring diagram
Do not mix up the R(red)/
built in.
Be extra careful when
checking.
properly due to the risk
of electric shock.
S(white)/T(black) wiring.
Do not insert the
protection tube inside
the terminal cover.
when removing a connector and
hold the connector section to
remove instead. Make sure it
is plugged in all the way.
(BLK)
T
R
(WHI)
S
(RED)
• Print or affix a display label indicating items considered particularly important for
safe handling. Check the display and proceed safely.
Risk of injury
Do not touch the suction
area and alminium fins.
Risk of injury
Do not insert
rods etc.
Risk of injury
Do not ride on top.
CAUTION
CAUTION CAUTIONWARNING
WARNING CAUTION
Risk of rupture
• Do not incorporate air into the chilling cycle.
• When starting operation, ensure that both
service valves are open.
WARNING
CAUTION
Charge the refrigerant using the liquid-side
charging inlet.
When refrigerant charging must be performed
from the gas side for unforeseen reasons in
order to adjust the refrigerant amount, gradually
charge with a small amount of refrigerant
(an amount evaporating in the pipe to the
compressor).
Also, be sure to install a cap on the charging
port.
Safety display label

8
3. Specifications
Model name: WAM600AR-SV-8
Use Mid-to-high temperatures
Declared output (kW) 4.5
Power supply 380-415 V 3N ~ 50 Hz
Refrigerant R410A
Inverter frequency variability range (Hz) 15 to 70
Compressor
Model name: RA790A4FJ-10UC1
Cooling capacity
(kW)
50 Hz 11.603
60 Hz 13.851
Nominal
(Maximum Hz) 16.080
Oil Type and included
volume Ester oil VG74 (2.0 L)
Crankcase heater Heaterless (motor coil heating)
Cooling scheme Liquid injection
Condenser
Model Air-cooled finned tube
Fan motor Model DC fan motor
Output and fan size 100 W Ø490 × 2
High-pressure control system Microcontroller-fan speed control
Receiver tank capacity (L) 13.0
Accumulator capacity (L) 6.3
Connecting pipe radius
(mm)
Intake line Ø25.4 (welded)
Liquid line Ø12.7 (flared)
Operating ranges
Evaporating temperature (°C) -20 to 10
Suction pressure (MPa) 0.30 to 0.99
Discharge pressure (MPa) 0.6 to 3.8
Compression ratio 2.0 or more
Compressor discharge pipe
temperature (°C) 100 or less
Compressor case bottom
temperature (°C) 40 to 90
Compressor intake pipe
temperature (°C) 20 or less (must be free of liquid backflow)
Ambient temperature (°C) -20 to 43
Voltage imbalance rate (%) Within 2% (within 4 V)
Maximum pipe length (equivalent) (m) 70
Maximum drop
(m)
Condensing unit
is higher 30
Condensing unit
is lower 30
Refrigerant charging tolerance (kg) 17.0
Recommended operating Pump-down cycle
Operating interval Operating for at least three minutes, stopped for at least three minutes (within 6 times per hour)
Product dimensions (W × D × H) 1196 (1202) mm × 442 (514) mm × 1563 mm Bracketed values indicate maximum dimensions,
including fin guard and stands
Product weight (kg) 191
Electrical
characteristics
Power
consumption (kW) 5.578
Operating
current (A) 9.2
Operating conditions
Ambient temperature 32°C
Evaporating temperature −10°C
Intake gas temperature 18°C
Compressor operating frequency 50 Hz
(Note 1) The pressure is gauge pressure unless a special display is made.
(Note 2) The compression ratio must always be at least 2.0.
(Note 3) Use commercial power with few voltage fluctuations.
Power generated by a generator or the like may be prone to voltage fluctuations. The condensing unit may stop when
appropriate voltage is not available.
(Note 4) The condensing unit may restart due to temporary power outages. Use a UPS if possible.
Instantaneous outages (0.05 s to 2 s) may occur due to lightning, depending on the load placed on the condensing unit.
In such situations, the condensing unit will restart after delay control (maximum duration: 3 minutes).
(Note 5) The refrigerant charging tolerance given in this specification is the refrigerant volume that can be circulated by the
condensing unit.

9
• Accessories
Check that the following accessories are included with the condensing unit.
No. Component name Shape Qty. Notes
1 Instruction Manual 1 This manual
2 Dryer 1 Must always be installed.
3 Sight glass 1 Must always be installed.
4 Repair Putty 3
Use this to caulk the clearances in the pipe
wiring outlet (side) after the piping and wiring
operations. See the attached note.

10
4. Safety instructions
Please use this condensing unit safely with the national law used certainly.
4.1 Preventing electric shocks
WARNING Grounding connection must be installed by the electrician
Improper grounding may result in electric shocks.
CAUTION
Install a leakage braker
Failure to install a leakage braker may lead to electric shocks.
The leakage braker is not included with the condensing unit.
(1) Ensure that the ground connection screw affixed to the condensing unit
body is properly connected to the grounding wire.
(2) Ensure that wiring does not come into contact with high-temperature
components (compressor, discharge gas pipe, condenser) and scratch-
prone components.
(3) Once the pipe work is finished, be sure to measure the insulation
resistance between the cables and grounding, and between pairs of
cables, checking for at least 1 MΩof insulation resistance.
Connect to ground
Grounding
must be
secure!
4.2 Fire safety
(1) Do not place flammable materials near the condensing unit
device.
(2) Do not pass the wiring through a heat insulating material such
as fireproof pipe to prevent overheating.
(3) Ensure that the power supply cords is not stepped on or caught.
Prohibited
Fire strictly
prohibited
4.3 Oxygen deficiency
A refrigerant leak in a poorly-ventilated area (e.g., a basement or corridor) may lead to oxygen deficiency.
Therefore, ensure that the area around the condensing unit is always ventilated.
4.4 Refrigerant used
This condensing unit only uses R410A.
(Never use a non-designated refrigerant. The condensing unit may be damaged if another
refrigerant is used.)

11
5. Installation work
Ensure that design and installation proceed in accordance with the following because the quality of
design and installation of refrigerant piping work greatly influences the performance, useful life, and
likelihood of faults for the condensing unit.
5.1 Before installation (installation site selection)
CAUTION
Do not install in a site where flammable gas leaks may occur
A fire may occur in the event of a gas leak filling the area around the condensing
unit.
CAUTION Do not install at a site having poor circulation
Oxygen deficiency may occur in the event of refrigerant leakage.
Obtain the customer’s approval to install the
air conditioner in a location that satisfies the
following conditions:
• Well-ventilated and free of inlet or outlet obstruction
• Not exposed to rain or to direct sunlight
• Does not amplify operating noise and vibrations
• Air blowout and operating noise from the
condensing unit does not disturb neighbours
• No problems or issues with exhaust drain water
• Sufficient access to service space for safe
maintenance checks
Avoid the following locations:
• Salty sites (coastal zones) and sites with sulfurous gas (hot
spring zones)
(Special maintenance is required for these zones)
• Sites where oil, steam, oil smoke, and corrosive gas may occur
• Sites where organic solvents are used
• Sites where other devices produce high frequencies (inverters,
private electric generators, medical equipment, communication
equipment)
(These devices may cause condensing unit malfunctions,
control errors, and damage due to noise.)
• Locations that cannot support the weight of the condensing unit
• The condensing unit cannot be used in chemical plants using
liquid carbon dioxide cooling.
(1) I mplement wind-blocking measures with
reference to the examples below if installing the
condensing unit at a site constantly exposed to
strong winds, such as upper floors of a building or
on a rooftop.
1. Install the condensing unit with the air outlet
facing a building wall.
However, leave at least 500 mm of space
between the outlet and the wall.
500
2. Estimate the wind direction during the season
of operation, and install the condensing unit so
that the air outlet is at a right angle to the wind.
Strong winds
Strong winds
3. If measures 1. and 2. are not feasible,
attach an air outlet guide (sold separately).
Strong winds
Air flow guide
(2) I f the condensing unit installed in a storefront with
the air outlet oriented toward a corridor, or if the
condensing unit is prone to heat accumulation
due to wraparound of putting out air, change the
air output direction by installing the separately-
soldairflow direction guide.
(3) Take snow weight into consideration if installing
the condensing unit in a snowy region.
• Reinforce the foundation or install a platform
(should be at least as high as expected snow
accumulation) for the condensing unit.
• Install a snow hood (sold separately).
Snowfall hood
Snowfall hood

12
5. Installation work (continued)
5.2 Refrigeration cycle precautions for R410A
The following points require special attention when installing a condensing unit using R410A in the
refrigeration cycle.
●R410A is more prone to reacting with water than conventional refrigerants. As such, take precautions
with water management above and beyond conventional measures.
●Never switch this condensing unit to a cycle using another refrigerant or oil.
(Chemical reactions may cause biological material to grow in the cycle.)
Failure to follow the above points may lead to unexpected faults in the cycle and damage
to the condensing unit. Always obey these precautions.
Cycle component processing and selection
●Do not reuse components that have been used in other refrigerant.
●Do not use any washing agent that contains chlorine on the components.
●Do not use any components that contain wax.
○Use a dryer for R410A.
Cycle assembly
Refrigerant charging
Vacuuming
○Open the condensing unit valves at the end of the cycle assembly process.
○Create the vacuum within 30 minutes of opening the condensing unit valves.
●For management and storage, be sure to no water enters the components or
cycle.
○Always use a nitrogen blower during brazing, and prevent the formation of oxide film.
●Use the gauge manifold, charging hose, and other equipment as R410A-
exclusive, and do not use the equipment being used for other refrigerant.
○Use R410A with a purity of at least 99.5%.
○Gradually add the liquid refrigerant.
○After the pressure testing, move on to vacuum creation without making a complete
purge
(remaining pressure: 0.02 MPa to 0.03 MPa).
●Do not add vacuum pump oil within the cycle.
●Use and manage the gauge manifold, charging hose, and other equipment as
R410A-exclusive, and do not use the equipment being used for other refrigerant.
○Ensure that the arrival pressure is no more than 0.13 kPa (absolute).
Pressure testing
Trial operation
●Never use fluorocarbons, oxygen, or any flammable gas as the pressurising gas.
●Before a vacuuming, be sure to do pressure testing.
○Confirm that condensing unit by a trial operation.

13
5.3 Installation space
Obstacles at the rear
■Open top
(1) Standalone installation
150
or more
(2) Installation with obstacles on both sides
200
or more
150
or more
250
or more
(150 or more when service space
can be secured for the rear face)
Ensure that the height of
all obstacles is less than
the height of the outdoor
unit.
(3) Consecutive installation
(two or more condensing units)
250
or more (*)
250
or more (*)
250
or more (*)
150
or more
200 or more
* 150 or more when service space
can be secured for the rear face
Ensure that the height of all obstacles is less than the height of the
outdoor unit.
■Overhead obstacles
150 or more
500 or more
(all units are mm)
Obstacles at the front
■Open top
(1) Standalone installation
500 or more
(2) Consecutive installation
(two or more condensing units)
1000 or more
■Overhead obstacles
800 or more
1000
or more
Obstacles and the front and rear
Ensure that the top and both sides are open.
Ensure that the height of any frontal obstacles is
less than the height of the outdoor unit.
■Standard installation
(1) Standalone installation
1000
or more
150
or more

14
5. Installation work (continued)
(2) Consecutive installation (two or more condensing units)
250 or more (*)250 or more (*)
200 or more
1000 or more
* 150 or more when service space
can be secured for the rear face
■Using a separately-sold
air outlet guide
700
or more
150
or more
Consecutive installation back and front
Ensure that the top and both sides are open.
Ensure that the height of any frontal obstacles is less than the height of the outdoor unit.
■Standard installation
200
or more
2000
or more
1500
or more
300
or more
1000
or more
■Using the separately-sold airflow direction guide
200
or more
1500
or more
1000
or more
300
or more
700
or more
Combination with other condensing unit
Avoid having the waste heat be directly absorbed by the
condenser. If this is unavoidable, install a partition board.
Partition board
500 or more

15
5.4 Condensing unit body installation
WARNING
Installation must be performed properly at a carefully selected site
sufficiently equipped for the product load
Insufficient strength or incomplete installation may cause the condensing unit to tip over or fall.
WARNING
Perform predetermined installation work as protective measures
against strong winds and earthquakes
If the unit is imperfectly installed, it could tip over and cause an accident.
(1) Perform sufficient checks of the foundation strength and level straightness to prevent abnormal noise.
(2) Use anchor bolts for secure fixing, as illustrated below. (Anchor bolts, nuts: M16 × 4 pairs)
228
484
(Anchor bolt
long hole pitch)
228740
Ensure that the anchor bolts
protrude by no more than 15 mm.
less than 15
(3) Height difference between condensing unit and load (cooler)
Cooler installed above the condensing unit body (Figure 5.4-1)
• Ensure that the height difference satisfies the following Adiagram.
• A large height difference may cause a gas flash due to pressure loss caused by a head difference
between liquid refrigerants.
Cooler installed below the condensing unit body (Figure 5.4-2)
• Ensure that the height difference satisfies the following Bdiagram.
• When the cooler is installed below the condensing unit, ensure sufficient intake pipe performance for the oil.
A
Solenoid (as close to the cooler as possible)
Service valves
Dryer
Liquid pipe
Intake pipe
Cooler Unit body
Liquid backflow prevention
loop when stopped
1/200 downward slope
(Apply heat insulation materials)
Trap for preventing
liquid backflow into
the temperature
sensing tube portion
Model name A
WAM600AR-SV-8 Within 30 m
Figure 5.4-1
Unit body
Dryer
Solenoid
(as close to the
cooler as possible)
Within 5 m
Service valves
Level difference for preventing liquid backflow
into the temperature sensing tube portion
Trap every
5 m
Oil-back trap
B
Liquid
pipe
Intake
pipe
Cooler
Model name B
WAM600AR-SV-8 Within 30 m
Figure 5.4-2
(4) Pump-down cycle specifications.
• Install an electromagnetic valve on the steam production side in accordance with the wiring diagram, and
collect refrigerant when the condensing unit is stopped.
• The condensing unit cannot be directly controlled by a warehouse thermo or the like.
• In the absence of pump-down, the refrigerant stagnation may occur and the compressor may damaged.
(5) Damage to the compressor may result from failure to install a liquid-return prevention loop,
bottom curve, oil-back trap, or the like as indicated in Figure 5.4-1 and Figure 5.4-2.

16
6. Pipe work
6.1 Pipe size selection
Install pipes having the same diameter as the
condensing unit connection pipe.
• Use “Copper and Seamless Copper Alloy Pipes”
having an internal oil adherence of no more than
40 mg/10 m, a pipe thickness of no less than
0.8 mm for Ø6.35, Ø9.52, and Ø12.70, no less
than 1.0 mm for Ø15.88, no less than 1.2 mm for
Ø19.05, and no less than 1.0 mm with 1/2 H material for Ø25.40 and Ø28.58.
Never use pipes thinner than the above.
• Use piping joints suitable to the pipe size.
• Use the flare nuts provided with the condensing unit.
WARNING
Before starting operation, open both service valves
When the service valves are not open, abnormally high pressure and temperature
in the refrigeration cycle occur, resulting in risks of rupture and fire.
CAUTION
Remove a portion of heat insulation material around the pipe inlets
and outlets of the casing, and caulk the area
If the condensing unit catches fire, smoke and fire may occur through the heat
insulating materials.
6.2 Pipe processing
(1) General cautions
1. Water, dust, chips and other impurities must
not adhere to the pipe interior. Use supervised
phosphorus deoxidation copper pipes.
2. Use specialized tools for pipe bending work.
3. Ask a welding technician for gas welding to perform
all welding (brazing) work.
4. While welding (brazing), in order to prevent oxide
scaling, pass an inert gas, such as a nitrogen gas,
through the pipe (at approximately 1 L/min), and
keep the gas flowing after welding until cooling is
complete. (Figure. 6-1)
(Figure. 6-1) Supply enough dry
nitrogen gas to be
weakly felt in the
palm of the hand.
Nitrogen
tank
Must be filled.
(There is a risk of air infiltrating the
interior if left opened.)
Brazed portion
5. Use an appropriate brazing material taking the relevant component and environment at the
condensing unit location into consideration.
Also, be sure to perform welding (brazing) at an appropriate temperature for the brazing
material.
6. If using flux, make appropriate selections suitable for the base material, type, shape, and
type of brazing material, and completely remove the flux after welding.
7. Do not move the welded portion immediately after welding (brazing). (Breakage may
result.)
Model name Pipe size
Liquid line Gas line
WAM600AR-SV-8 Ø12.70 mm Ø25.40 mm

17
(2) Connection of refrigerant pipe
1. Take steps to ensure that no water, dust, dirt, chips, wall materials, and so on enters the pipes
during refrigerant pipe connection.
2. Use pipe tools that are suited to the refrigerant (R410A) and the pipe radius.
3. Perform pipe work as follows.
■Copper pipe protrusion during flare processing: B (units: mm)
Outer
diameter of
copper pipe
Rigid (Clutch type)
9.52
12.70
19.05
When using a R410A
tool
When using a
conventional tool
0 to 0.5 1.0 to 1.5
■Copper pipe protrusion during flare processing: A (units: mm)
Outer
diameter of
copper pipe
A+0
-0.4
9.52 13.2
12.70 16.6
19.05 24.0
*When using a conventional flare tool for R410A flare
processing, processing may proceed at defined flare
dimensions provided that the extension is approximately
0.5 mm more than for R22. Using a copper gauge is
beneficial in adjusting protrusion dimensions.
■Brazed pipe joint dimensions
Connection portion
External size Internal size
ØA
KG
ØF
(Unit: mm)
Copper
connection
pipe
Standard
external
diameter
Connection portion
Minimum
thickness of
coupling
External size Internal size
Minimum
insertion
depth
Roundness
Standard external
diameter
(allowable difference)
A
Standard internal
diameter
(allowable difference)
FKG
6.35 6.35 (±0.03) 6.45 (+0.04
−0.02 )7 6 less than 0.06 0.50
9.52 9.52 (±0.03) 9.62 (+0.04
−0.02 )8 7 less than 0.08 0.60
12.70 12.70 (±0.03) 12.81 (+0.04
−0.02 )9 8 less than 0.10 0.70
15.88 15.88 (±0.03) 16.00 (+0.04
−0.02 )9 8 less than 0.13 0.80
19.05 19.05 (±0.03) 19.19 (+0.04
−0.02 )11 10 less than 0.15 0.80
25.40 25.40 (±0.04) 25.56 (+0.06
−0.02 )13 12 less than 0.18 0.95
28.58 28.58 (±0.04) 28.75 (+0.06
−0.02 )13 12 less than 0.20 1.00
4. After pipe processing, check for scratches on the processed portions, chip adhesion, gradation,
inclination, and so on.
5. Check the following items when re-using previously installed pipes.
If any faults are found, install new pipes in whole or in part and do not re-use the faulty portions.
• Was this pipe used for other refrigerant or oil?
• Has this pipe been corroded, cracked, scratched, deformed, or similar?
• Does the pipe processing meet the above-described dimensions?
Does the pipe thickness conform to the designations in this manual?
• Is there any damage to the heat insulating materials or to designated materials of the pipe?
Also, be sure to check past records for the years since pipe installation, record of pipe corrosion
and leaks, and so on to confirm whether the pipe can be reused.

18
6. Pipe work (continued)
(3) Tightening connections
1. Adjust the flare nut at the center of the connecting pipe and
sufficiently tighten it manually, then fix it with a spanner
and tighten with a torque wrench as shown in Figure. 6-2.
2. Always use a double spanner, as shown in Figure. 6-2, for
loosening and tightening flare nuts on the gas side valve.
Using a single spanner does not provide sufficient torque
for tightening.
Use a single spanner for loosening and tightening of flare
nuts on the liquid side valve.
Outer diameter of
copper pipe Flare nut tightening torque
6.35 mm 14 to 18 N∙m
9.52 mm 34 to 42 N∙m
12.7 mm 49 to 61 N∙m
15.88 mm 68 to 82 N∙m
19.05 mm 100 to 120 N∙m
1. Do not use a spanner on the stem cap.
The valve may be damaged.
2. If excessive torque is applied, the nut may be
damaged under certain installation conditions.
Caution
3. When all pipe connections have been installed, be sure to
use nitrogen to conduct a gas leak test.
• The pressure in an R410 system is 1.6 times the pressure in an
R22 system.
Accordingly, ensure that the flare pipe connections connecting
to the cooler and condensing unit are securely tightened with
a torque wrench using the stated tightening torque. Improperly
tightened connections could lead to gas leaks and damage to
the refrigeration cycle.
Do not applying refrigerating oil to the flare surface.
(Oil may cause slipping and lead to excessive torque
application)
(Figure. 6-2)
Stem cap
Service valve
Loosen
Tighten
Flare nut
(4) Intake pipe
1. Apply insulation work (refrigeration: 25 mm thick, freezing:
50 mm thick) to the intake pipe and do not use a pipe
interlinked with the liquid pipe. (Figure. 6-3)
2. The intake pipe should always have a down grade (1/200).
Also install an oil trap at an upright portion of the intake
pipe.
(5) Liquid pipe (make sure not to generate flushing gas)
1. If used in a multi-branch cycle, install the branching pipe
in the direction of gravity in order to always supply a full
amount of refrigerant to the expansion valve. (Figure. 6-4)
2. When the liquid pipe is upright, a pressure loss of
approximately 0.012 MPa per meter occurs. Therefore,
take care to always supply extra cooling to compensate for
this loss.
3. If the liquid pipe is expected to be heated by another
heating source, perform additional insulation work. (This
includes direct exposure to sunlight, and being installed
near heat sources like discharge pipes and boilers)
(Figure. 6-3)
Intake pipe
Liquid pipe
Insulation
(Figure. 6-4)
Branch
Direction
of gravity
Flow of
refrigerant
Prohibited