Hitachi RAS-8.0HNBRMQ1 - Initial Troubleshooting; Checking Electrical Wiring and Power Source

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1. Initial Troubleshooting
1.1 Checking Electrical Wiring and Power Source
(1) Check the following items for any abnormality in activation of the system.
No. Check Situation Check Method
1
Is any power source breaker or fuse
blown?
Check the voltage (Load side) of the breaker and also check the continuity of the fuse
with a tester.
2
Is voltage at the secondary side of the
transformer correct?
Disconnect at the secondary side of the transformer and measure voltage with a tester.
3
Is wiring rmly secured and
correctly connected?
Check that the following wiring connection on O.U./I.U. printed circuit
boards (PCBs) is not loose:
● The connection for thermistors
● The connection for the wired controller cable
● The connection for communication cable
● Each connection for power source line
Check that the wiring connection on O.U./I.U. PCBs is not loose or misconnected on
the site according to the “Electrical Wiring Diagram”.
Notes:
●
If the fuse(s) on an I.U. PCB blows out, diagnose the cause of over current and recover the fuse(s).
●
In addition, check the power source of optional parts because the fuse may blow out because of the power source failure.
(2) Electrical Characteristics
Model
Power Supply Voltage Range
Start current
Rated Current Input
MOP MCA
Voltage PH Hz Max Min Cooling Heating
(V) Φ Hz (V) (V) A A A A A
RAS-3.0HNBRKQ1 220~240 1 50 264.0 198 8.7 9.5 9.9 32 21
RAS-3.5HNBRKQ1 220~240 1 50 264.0 198 8.7 12.9 12.3 32 21
RAS-4.0HNBRKQ1 220~240 1 50 264.0 198 10.6 12.6 14.0 40 31
RAS-4.5HNBRKQ1 220~240 1 50 264.0 198 10.6 14.8 16.1 40 31
RAS-5.0HNBRKQ1 220~240 1 50 264.0 198 10.6 18.3 19.2 40 31
RAS-6.0HNBRKQ1 220~240 1 50 264.0 198 10.6 20.2 20.7 40 31
RAS-6.5HNBRKQ1 220~240 1 50 264.0 198 10.6 26.0 24.0 40 31
RAS-7.0HNBRMQ1 380~415 3 50 456.5 342 8.5 13.0 12.0 25 20
RAS-8.0HNBRMQ1 380~415 3 50 456.5 342 8.5 14.0 13.0 25 20
RAS-10HNBRMQ1 380~415 3 50 456.5 342 20.0 19.0 18.0 40 28
RAS-11HNBRMQ1 380~415 3 50 456.5 342 20.0 20.0 19.0 40 28
RAS-12HNBRMQ1 380~415 3 50 456.5 342 20.0 21.0 20.0 40 28
MCA: Minimum Circuit Ampacity (A);
MOP: Maximum Overcurrent Protective Device (A)
Notes:
● Power voltage ranges are the following.
Supply Voltage: Rated Voltage within ±10%; Starting Voltage: Rated Voltage within -15%;
Operating Voltage: Rated Voltage within ±10%.
● Do not connect the ground wiring to gas piping, water piping, or a lightning conductor.
Gas Piping: An explosion and ignition may occur if gas is escaping.
Water Piping: There is no effective electrical ground provided when hard vinyl piping is used.
Lightning Conductor: The electrical potential of the earth increases when a lightning conductor is used.
TROUBLESHOOTING