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BEFORE OPERATION
or lines shall be as short as possible to minimise the
amount of refrigerant contained in them.
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Cylinders shall be kept upright.
Ensure that the refrigeration system is earthed prior to
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charging the system with refrigerant.
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Label the system when charging is complete (if not
already).
-
Extreme care shall be taken not to overfill the
refrigeration system.
•
Prior to recharging the system it shall be pressure tested
4 BEFORE OPERATION
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C A U T I O N
•
Supply electrical power to the system for approximately 12 hours
before start-up after long shutdown. Do not start the system
immediately after power supply, it may cause a compressor failure,
because the compressor is not heated well.
•
Make sure that the outdoor unit is not covered with snow or ice. If
covered, remove it by using hot water (approximately 50ºC). If the water
temperature is higher than 50ºC, it will cause damage to plastic parts.
4.1 EFFICIENT USE OF INDOOR UNIT
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Do not leave a window or a door open.
The operating efficiency will be decreased.
It may cause dew condensation of the indoor unit. (Ventilate
a room sufficiently too.)
•
Attach a curtain or a blind to a window.
Direct sunlight is prevented and the cooling efficiency will be
increased.
•
Do not use heating appliances during the cooling operation
as possible.
The cooling efficiency will be decreased. It may cause dew
condensation and dropping dew.
•
Use a circulator if warm air stays around ceiling.
The comfortability will be increased. Contact your distributor
for the detail.
•
Change the air flow direction downward if the ceiling surface
gets dirty.
It is recommended to change the air flow direction by
approx. 30º downward from the levelness.
5
PMML0477 rev.2 - 11/2017
with OFN. The system shall be leak tested on completion
of charging but prior to commissioning. A follow up leak test
shall be carried out prior to leaving the site.
•
Replace components only with parts specified by HITACHI.
Other parts may result in the ignition of refrigerant in the
atmosphere from a leak.
DECOMMISSIONING
•
Before carrying out decommissioning, it is essential that
the technician is completely familiar with the equipment
and all its detail. It is recommended good practice that all
refrigerants are recovered safely.
•
When the system is started after a shutdown longer than approximately
3 months, it is recommended that the system be checked by your
service contractor.
•
Turn OFF the main switch when the system is stopped for a long
period of time. If the main switch is not turned OFF, electricity is
consumed, because the oil heater is always energized during
compressor stopping.
•
Turn OFF the main power source if the indoor unit is not
used for a long time.
If not, the standby electricity charges will have to be paid
even if the indoor unit is unused.
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N O T E
The recommended temperatures range for safety testing should be as
below:
Minimum Maximum Minimum Maximum
Dry bulb °C
21
Indoor
Wet bulb °C
15
Dry bulb °C
21
Outdoor
Wet bulb °C
15
Cooling
Heating
32
20
27
23
12
19
43
2
21
26
1
15
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