6
2. Complete charging of the refrigerant
When the entire refrigerant pipe length is within 30 meters (for
R407C) and 7.5 meters (for R22), charge the refrigerant in
accordance with the amount mentioned in the nameplate, and
when the pipe length exceeds 30 meters (for R407C) and
7.5 meters (for R22), the charging amount mentioned in the
nameplate and that required for additional charging are to be
totalled as the net charging amount.
3. Precaution for pumping-down operation
The outdoor unit is equipped with a low-pressure switch to
protect the compressor. Take the following steps to perform
the pumping-down operation.
Caution
Never short-circuit the low-pressure switch in this operation.
In order to avoid electric shock, please put the insulation sheet
as follows. (See figure 9).
1 Switch box
2 PCB
3 Pump down button
4 Insulation sheet
5 Tape
1. Start the fan operation with the remote controller.
Confirm that stop valves both on the liquid and gas side are
open.
2. Push the pumping-down button on the PC board of the
outdoor unit during more than 5 seconds.
Compressor and outdoor fan will start operation automatically.
If step 2 is performed before step 1, then the indoor fan may
automatically start running. Please pay attention to this.
3. Continue operation for 2 min. until operation condition
stabilizes.
4. Close the stop valve on the liquid side securely. (See
“Operating stop valve”.)
Insecure closing of the valve may result in burning of the
compressor.
5. When the low-pressure switch is activated, the unit stops
working. At this time, close the stop valve on the gas side.
This is the end of pumping-down operation. After pumping-down
operation, the remote controller can show the following pattern:
•
“U4”
•
blank screen
•
indoor fan operates for about 30 sec.
even when ON button on the remote controller is pressed, and it
will not operate. Turn off the main power supply switch and turn
it on again in need of operation.
E
LECTRICAL
WIRING
WORK
•
All wiring must be performed by an authorized electrician.
•
All components procured on the site and all electric construct-
ion should comply with the applicable local and national codes.
•
Be sure to use a dedicated power circuit.
•
Do not share a common source with other equipment.
•
Fix cables so that cables do not make contact with the pipes
(especially on high pressure side).
•
Make sure to connect power supply cables in normal phase.
If connected in reverse phase, the remote controller of indoor
unit indicates “U1” and the equipment cannot operate.
Change any two of the three power supply cables (L1, L2, L3)
to correct phase.
If the contact in the magnetic switch should be forcibly turned
on while the equipment is inoperative, the compressor will
burn out. Never try to forcibly turn on the contact.
•
Never squeeze bundled cables into a unit.
•
When cables are routed from the unit, a protection sleeve for
the conduits (PG-insertions) can be inserted at the installation
hole. (Refer to figure 8)
A
Inside
B
Outside
1
Wire
2
Bush
3
Nut
4
Frame
5
Hose
•
Follow the electric wiring diagram for electrical wiring works.
•
Grounding resistance should be according to national
regulations.
Wiring of power supply and the units
Refer to the installation manual attached to the indoor unit for
wiring of indoor units, etc.
Attach an earth leak detector and fuse to the power supply line.
(See figure 10).
I
Pair
II
Twin
III
Triple
IV
Double Twin
M
Master
S
Slave
1
Earth leak detector
2
Fuse
3
Remote controller
*
Only in protected pipes, use HO7RN-F when protected pipes
are not used.
Power supply
Wire type of wiring
between the units
Size
Wire type
(*)
Field fuse
Model
Wiring size must
comply with the
applicable local
and national code
R(Y)(P)200
25A
H05VV-U5G
H05VV-U4G2.5
R(Y)(P)250
32A
H05VV-U5G
H05VV-U4G2.5
