Condenser Installation Manual
En-7
• After connecting the pipes, perform a sealing test.
• Make sure that the 3-way valves are closed before performing a sealing test.
• Pressurize nitrogen gas to 4.15 MPa to perform the sealing test.
• Add nitrogen gas to both the liquid pipes and the gas pipes.
• Check all are connections and welds. Then, check that the pressure has not
decreased.
• Compare the pressures after pressurizing and letting it stand for 24 hours, and check
that the pressure has not decreased.
* When the outdoor air temperature changes 41 °F (5 °C), the test pressure changes
0.05 MPa. If the pressure has dropped, the pipe joints may be leaking.
• If a leak is found, immediately repair it and perform the sealing test again.
• After completing the sealing test, release the nitrogen gas from both valves.
• Release the nitrogen gas slowly.
3.8. Vacuum process
CAUTION
• Perform a refrigerant leakage test (air tightness test) to check for leaks using
nitrogen gas while all valves in the outdoor unit are closed. (Use the test pressure
indicated on the nameplate.)
• Be sure to evacuate the refrigerant system using a vacuum pump.
• The refrigerant pressure may sometimes not rise when a closed valve is opened
after the system is evacuated using a vacuum pump. This is caused by the closure
of the refrigerant system of the outdoor unit by the electronic expansion valve. This
will not aect the operation of the unit.
• If the system is not evacuated suciently, its performance will drop.
• Use a clean gauge manifold and charging hose that were designed specically for
use with R410A. Using the same vacuum equipment for dierent refrigerants may
damage the vacuum pump or the unit.
• Do not purge the air with refrigerants, but use a vacuum pump to evacuate the
system.
Refrigerant for purging the air is not charged in the outdoor unit at the factory.
(1) Remove the cap, and connect the gauge manifold and the vacuum pump to the
charging valve by the service hoses.
(2) Vacuum the indoor unit and the connecting pipes until the pressure gauge indicates
–0.1 MPa (–76 cmHg).
(3) When –0.1 MPa (–76 cmHg) is reached, operate the vacuum pump for at least
60 minutes.
(4) Disconnect the service hoses and t the cap to the charging valve to the specied
torque.
(5) Remove the blank caps, and fully open the spindles of the 3-way valves with a
hexagon wrench [Torque: 4 to 5 lbs·ft (6~7 N·m)].
(6) Tighten the blank caps of the 3-way valves to the specied torque.
Tightening torque [lbs·ft (N·m)]
Blank cap
[in (mm)]
1/4 (6.35) 14.8 to 18.4 (20 to 25)
3/8 (9.52) 14.8 to 18.4 (20 to 25)
1/2 (12.70) 18.4 to 22.1 (25 to 30)
5/8 (15.88) 22.1 to 25.8 (30 to 35)
3/4 (19.05) 25.8 to 29.5 (35 to 40)
Charging port cap 7 to 9 (10 to 12)
/R +L
Service valve
(liquid)
Gauge manifold
Flare nuts
Blank caps
Vacuum pump
Charging port
Service valve
(gas)
Use a 4 mm hexagon wrench
Charging port cap
3.9. Additional charging
WARNING
When moving and installing the air conditioner, do not mix gas other than the specied
refrigerant R410A inside the refrigerant cycle.
If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to
an abnormally high value and cause breakage, injury, etc.
CAUTION
• After vacuuming the system, add refrigerant.
• Do not reuse recovered refrigerant.
• When charging the refrigerant R410A, always use an electronic scales for refrigerant
charging (to measure the refrigerant by weight). Adding more refrigerant than the
specied amount will cause a malfunction.
• When charging the refrigerant, take into account the slight change in the composition
of the gas and liquid phases, and always charge from the liquid phase side
whose composition is stable. Adding refrigerant through the gas pipe will cause a
malfunction.
• Check if the steel cylinder has a siphon installed or not before lling. (There is an
indication “with siphon for lling liquid” on the steel cylinder.)
Filling method for cylinder with siphon
R410A
Gas
Liquid
Set the cylinder vertical and ll with the liquid.
(Liquid can be lled without turning bottom up with the
siphon inside.)
Filling method for other cylinders
R410A
Gas
Liquid
Turn bottom up and ll with liquid.
(Be careful to avoid turning over the cylinder.)
• Be sure to use the special tools for R410A for pressure resistance and to avoid
mixing of impure substances.
• If the units are further apart than the maximum pipe length, correct operation can not
be guaranteed.
• Make sure to back closing valve after refrigerant charging. Otherwise, the
compressor may fail.
• Minimize refrigerant release to the air. Excessive release is prohibited under the
Freon Collection and Destruction Law.
■
Gas leakage inspection
CAUTION
After connecting the piping, check the all joints for gas leakage with gas leak detector.
3.10. Electrical wiring
3.10.1. Conduit installation
(1) Remove the tapping screw, then remove the conduit cover.
(2) Fasten the Inter-unit wire harness and power supply to the conduit holder using
the lock nut.
(3) Connect inter-unit wire harness and power supply to the terminal.
(4) Use the tapping screw to install the conduit cover.
NOTES:
• Connector trade size for this unit is 1/2 inch. The connector can be bought at a hard
ware store. Refer to “3.10.2. Notes for electrical wiring
■
How to connect wiring to the
terminal”.
• The fuse located in the outdoor unit provides power supply protection and may blow
when power is applied if the system has been incorrectly wired.
Lock nut
Conduit connector
Tapping screw
Power supply
Inter-unit wire harness
Conduit cover
Fix the conduit with the supporters as shown below.
Supporter
Conduit
Outdoor unit
30 in
(756 mm)
or less
54 in
(1360 mm)
or less
54 in
(1360 mm)
or less
54 in
(1360 mm)
or less
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