Hitachi RAM-90NP5B [2/2] Caution
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Hitachi RAM-90NP5B [2/2] Caution

Hitachi RAM-90NP5B [2/2] Caution
4. Preparation of Pipe
● Use a pipe cutter to cut the copper pipe.
● Before fl aring, please put on the fl are nut.
Outer
Diameter (Ø)
6.35 (1/4”)
9.52 (3/8”)
12.7 (1/2”)
15.88 (5/8”)
Imperial fl aring tool
0
~ 0.5mm
0
~ 0.5mm
0
~ 0.5mm
0
~ 0.5mm
Rigid fl aring tool
A (mm)
● Please use exclusive tool
1.0mm
1.0mm
1.0mm
1.0mm
● Please be careful when bending the copper pipe.
● Screw in manually while adjusting the center. After that, use of torque wrench to tighten the connection.
CAUTION
!
● In case of removing fl are nut of a indoor unit, fi rst remove a nut of small diameter side, or seal
cap of large diameter side will fl y out. Free from water into the piping when working.
● During connection, keep away from water.
● Be sure to tighten the fl are nut to the specifi ed torque using a torque wrench. If the fl are nut is
tightened excessively, it may crack as time elapses, causing refrigerant leakage.
● Install the unit in a stable place to minimize vibration or noise.
● After arranging the cords and pipes, secure them in place.
Tighten all the way by hand.
Do not tighten all at once, but tighten it while
fi tting the fl ared surface to the pipe.
CAUTION
!
5. Pipe Connection
5.1 Pipe connection
Connecting the pipe to outdoor unit
(1) Remove the fl are nut and seal cap from the service valve.
(2) Apply refrigerator oil to the service valve and the fl ared
portion of the pipe.
(3) Using a wrench, security tighten.
● Jagged edge will cause leakage.
● Point the side to be trimmed downwards during trimming
to prevent copper chips from entering the pipe.
6. Removal Of Air From The Pipe And Gas Leakage Inspection
This system integrates 5 sub-systems of piping with 1 pair of service valves installed. That pair will be used for air purging and
pumping down operations. Furthermore, due to valves are not installed to cover up the connecting mouths, there is a need for
all unutilized connecting mouths to be tightly covered up by seal caps and fl ared nuts.
CAUTION: Should all unutilized connecting mouths are not tightly covered up by seal caps and fl ared nuts, there will be
potential gas leaks occurring.
6.1 Air purging by using vacuum pump
Fig. 6-1
Fig. 6-2
Fig. 6-3
<
IA1235: A
>
Outer diameter of pipe (Ø)
Torque N·m (kgf
·
cm)
Small diameter side
Large diameter side
6.35 (1/4”)
13.7-18.6 (140-190)
9.52 (3/8”)
34.3-44.1 (350-450)
12.7 (1/2”)
44.1-53.9 (450-550)
Small diameter side
Large diameter side
6.35 (1/4”)
19.6-24.5 (200-250)
9.52 (3/8”)
19.6-24.5 (200-250)
12.7 (1/2”)
29.4-34.3 (300-350)
Valve head
cap
12.3-15.7 (125-160)
Valve core cap
15.88 (5/8”)
49.0-58.8 (500-600)
15.88 (5/8”)
29.4-34.3 (300-350)
7. Operation test
● Please ensure that the air conditioner is in normal operating condition during the operation test.
● Explain to your customer the proper operation procedures as described in the user’s manual.
● If the indoor unit does not operate, check to see that the connections are correct.
CAUTION
● Trial run should be conducted on one unit at a time to check for incorrect wiring of connecting cord.
!
Fig. 6-4
8. Recovery of refrigerant during relocation or uninstalling of unit
(1) Switching ON the outdoor unit’s test switch will run the forced cooling
operation.
(2) After operating for around 5 minutes, rotate the service valve spindle
located at the side of the small pipe rim, in a clockwise direction to
achieve a full shut off.
(3) After operating for around 2~3 minutes, rotate the service valve spindle
located at the side of the large pipe rim, in a clockwise direction to
attain a full shut off.
(4) Immediately stop the forced cooling operation and switch OFF the
power supply.
(5) Use a spanner or similar tools to tighten fully all valve cap and valve
core cap to their specifi ed torque values.
(6) Install and tighten the seal caps and fl ared nuts on all connecting
mouths of each and every piping installed.
9. Forced Cooling Operation
Pressing the outdoor unit’s test switch for more than 1 second will start the
forced cooling operation.
Please run this operation whenever there is a need to perform trouble-shooting
or recovery of outdoor unit’s refrigerant.
CAUTION: In the event that the service valve spindle had been closed, do not operate it for more than 5 minutes.
Remove the valve cap from the service valves located at both the large
and small pipe rims
➤
After removing the valve cap of the valve core of the service valves
located at the large pipe rim, connect the charging hose A.
➤
After connecting the vacuum suction pump adaptor, connect the charging
hose B to the adaptor.
➤
During relocation or at any one time when the air conditioner unit
is removed and re-installed, there is a possibility of getting a closed
electric-powered valve. Should the electric-powered valve be closed,
even with air purging being conducted, certain amount of air is still
trapped within that area, hence, there is a need to open up the electric-
powered valve to do an air purging. Under such circumstances, before
using the vacuum-suction pump, the main power supply (LN terminal)
should be connected to enable a complete opening up of the valve.
After connecting the power supply for approximately 90 seconds, the
valve will be fully opened up, after which disconnect the power supply
and start using the vacuum suction pump.
(Refer to “Power Supply Terminal Connections” in regards to the LN
terminal)
CAUTION: Ingress of air during the operating cycle may cause increase
in pressure and other breakdowns.
➤
Switch off the outdoor unit’s power supply
➤
Shutting off via the manifold valve handle Hi, the handle Lo will open
up and operate the vacuum pump that will run a vacuum suction for
approximately 60 minutes.
➤
Upon a full shut off via the manifold valve handle Lo, the vacuum pump
will stop operating.
➤
Check to ensure that there is no gas leakage.
➤
After removing the charging hose A, rotate the service valve spindles
(2 units on both sides) in an anti-clockwise direction to fully open up.
➤
Reinstall the cap nuts to their original positions and tighten them to their
specifi ed torque values.
➤
Disconnect the charge hose from the service valve.
➤
Tighten the valve cap of valve core.
[Torque 12.3 - 15.7 N·m (125 - 160 kgf·cm)]
➤
Attach the valve cap to the spindles of each large and small dia. pipe
side service valves.
➤
Tighten the valve cap of the spindle.
[Torque 19.6 - 24.5 N·m (200 - 250 kgf·cm)]
Gas leakage inspection
Please use gas leakage detector to check if leakage occurs
at connection of fl are nut as shown on the right.
If gas leakage occurs, further tighten the connection to stop leakage. (Use the detector provided
for R410A)
!
INS RAM-90NP5B 2INS RAM-90NP5B 2 2/27/15 9:22 AM2/27/15 9:22 AM

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