Safety And Control Device Setting - Hitachi mini-HNRQ1 Series Service Manual

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
●
None ●
●
Less than the actual ●
connected ●

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
High Pressure Switch
Cut-Out
Cut-In
Breaker
Crankcase Heater
CCP Timer
Setting Time
Malfunction
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.
Power supply for indoor unit is not turned on;
Disconnect the transmission cables between outdoor unit and indoor units.
RAS-3.0~
3.5HNBRKQ1
Automatic Reset, Non-Adjustable
-0.05
MPa 4.15
-0.2
+0.15
MPa 3.2
-0.2
A 32
W 24
Non-Adjustable
Min
3
Turn off the power supply to check
● 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.
RAS-4.0~ RAS-7.0~
6.5HNBRKQ1 8.0HNBRMQ1
Automatic Reset, Non-Adjustable
-0.05
4.15 4.15
-0.2
+0.15
3.2 3.2
-0.2
40
28
Non-Adjustable Non-Adjustable
3
40
RAS-10~
12HNBRMQ1
-0.05 -0.05
4.15
-0.2 -0.2
+0.15 +0.15
3.2
-0.2 -0.2
25 40
80 80
Non-Adjustable
3 3