Hitachi RAS-3HVRNM2, Инструкция по установке и обслуживанию, Страница: 50 / 58

2-122 TC-12001
OUTDOOR UNIT
46 P5414950-rev.1
10. Test Run
10.1 Before Test Run
O
The unit can not be operated in the reversed
phase of the power source.
When connecting the reversed phase of the
power source, the alarm code “05” will be
indicated. Reconnect the phases correctly.
O
Do not operate the system until all the check
points have been cleared.
(A) Check to ensure that the electrical resistance
(Insulation Resistance) is more than
1 megohm, by measuring the resistance
between ground and the terminal of the
electrical parts. If not, do not operate
the system until the electrical leakage is
found and repaired according to the “About
Insulation Resistance”.
(B) Check to ensure that the stop valves of the
outdoor unit are fully opened, and then start
the system.
(C) When the power source line is disconnected,
the unit is not operated. Check to ensure the
power source and the power-supply facility.
(D) Check to ensure that the power source has
been turned ON for more than 12 hours, to
warm the compressor oil by the crankcase
heater. If not, the unit can not be operated
for maximum 4 hours.
(E) Check the following working range.
O
Pay attention to the following items while the
system is running.
(A) Do not touch any of the parts by hand at the
discharge gas side, since the compressor
chamber and the pipes at the discharge side
are heated higher than 90
o
C.
(B) DO NOT PUSH THE BUTTON OF THE
MAGNETIC SWITCH(ES). It will cause a
serious accident.
O
Do not touch any electrical components for more
than three minutes after turning OFF the main
switch.
An electrical shock will occur by residual
voltage.
O
Disconnect the power source completely
before starting the maintenance for electrical
parts.
O
Check to ensure that no residual voltage
is existed after disconnecting the power
source.
< About Insulation Resistance >
Check to ensure that the insulation resistance
is more than 1 megohm by measuring the
resistance between ground and the terminal of
the electrical parts by a megohm meter.
(1) If the total unit insulation resistance is lower
than 1 megohm, the compressor insulation
resistance may be low due to retained
refrigerant in the compressor. This may
occur if the unit has not been used for long
periods. If the insulation resistance of the
unit is lower than 1 megohm or the earth
leakage breaker is activated, check following
items.
Checking Detail:
(A) Disconnect the cables for the compressor
and measure the insulation resistance of
the compressor itself. If the resistance
value is over 1 megohm, the insulation
failure has occurred at other electrical
parts.
(B) If the insulation resistance is lower than
1 megohm, disconnect the compressor
cable from the inverter PCB. Then, turn
on the main power to apply current to
the crankcase heater. After applying
current for more than 3 hours, measure
the insulation resistance again. If the
insulation resistance is more than 1
megohm, there is no problem to the
compressor and reconnect the cables
for compressor. If not, it is considered
the compressor failure. (Depending the
air conditions, pipe length or refrigerant
conditions, it may be necessary to apply
the current for a longer period of time.)
NOTE:
When reconnecting the cables to the
compressor, pinch the crimp terminal
with long-nose pliers to ensure that it is
securely fastened.
(2) Check the recommended size of the ELB
shown in Table 7.1 and 7.2.
Select high-sensitive high speed ELB when
the rated sensitive current is less than 30
mA. (The motion time should be within 0.1
second.)
Cooling
Operation
Heating
Operation
I.U. Suction Air
Temperature
> 15
o
C WB < 27
o
C DB
O.U. Suction Air
Temperature
> -5
o
C DB < 15
o
C WB
*DB: Dry Bulb, WB: Wet Bulb
(F) Connect a manifold gauge in order to
measure the pressure from the check
joint according to item 6.3 “(4) Pressure
Measurement by Check Joint”.