Hitachi Set Free mini-HNRQ1 Series, Service Manual

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40
OPERATION
(7) During the test run, if any malfunction happens, please examine and clear it by referring to the table of
alarm codes.
(8) If the indicated number of the wired controller is different with the actual connected indoor units, the
auto-address function is not performed correctly due to incorrect wiring. Turn off the power supply and
correct the wiring after checking the following points:
Indicated Number Malfunction Turn off the power supply to check
None
● Power supply for indoor unit is not turned
on or incorrect wiring;
● Power supply for outdoor unit is not turned
on or incorrect wiring;
● Incorrect wiring of wired controller.
● The terminal block for transmission wiring in the
indoor unit;
● The terminal block for transmission wiring in the
wired controller;
● The wiring connected to the wrong terminals;
● The screws for the terminal block are loosen.
Less than the actual
connected
● Power supply for indoor unit is not turned on;
● Disconnect the transmission cables between outdoor unit and indoor units.
7. Safety and Control Device Setting
The compressor is protected by the following devices and their combinations:
(1) High Pressure Switch: This switch cuts out the operation of the compressor when the discharge pressure
exceeds the setting.
(2) Crankcase Heater: This band type heater protects against oil foaming during cold starting, as it is
energized while the compressor is stopped.
Model
RAS-3.0~
3.5HNBRKQ1
RAS-4.0~
6.5HNBRKQ1
RAS-7.0~
8.0HNBRMQ1
RAS-10~
12HNBRMQ1
High Pressure Switch Automatic Reset, Non-Adjustable Automatic Reset, Non-Adjustable
Cut-Out MPa 4.15
-0.05
-0.2
4.15
-0.05
-0.2
4.15
-0.05
-0.2
4.15
-0.05
-0.2
Cut-In MPa 3.2
+0.15
-0.2
3.2
+0.15
-0.2
3.2
+0.15
-0.2
3.2
+0.15
-0.2
Breaker A 32 40 25 40
Crankcase Heater W 24 28 80 80
CCP Timer
Setting Time
Min
Non-Adjustable
3
Non-Adjustable
3
Non-Adjustable
3
Non-Adjustable
3