Hitachi Set Free mini-HNRQ1 Series, Service Manual

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1.5 Checking Using 7-Segment Display
● Only an authorized person can check using this method.
(1) Before Checking
● Turn ON the main power supply. Wait for more than 20 seconds to start checking.
● Checking Items
* Expansion Valve Opening
* Temperature Readings from Thermistors
* Number of Indoor Units Connecting in the Same System
● Check the locations of 7-segment and push switches.
●
AC220~240V is applied to the PCB and electrical parts. Never touch electrical parts and wires without
appropriate personal protective equipment (PPE) when checking.
Check the operating conditions and each part of the refrigerant system temperature condition by 7-segment
display (SEG1) on the service board (3~6.5HP) or outdoor unit PCB (7~12HP) and push switches (PSW).
(A) To start the checking mode: Press PSW2 for 3 seconds;
(B) To move the checking item forward: Press PSW2;
(C) To move the checking item backward: Press PSW3.
(D) To cancel the checking mode: Press PSW2 for 3 seconds.
WARNING
!
剱
剱
剱
剱
剱
PSW3
PSW3
PSW3
PSW3
PSW3
PSW3
PSW3
PSW2
PSW2
PSW2
PSW2
PSW2
PSW2
PSW2
Checking Mode Normal Mode
PSW2 for 3sec.
PSW2 for 3sec.
ڰڰڰڰڰڰ
Index of
Check Item No.1
ڰڰڰڰڰڰ
Information
of Check Item No.1
ڰڰڰڰڰڰ
Index of
Check Item No.2
ڰڰڰڰڰڰ
Information
of Check Item No.2
ڰڰڰڰڰڰ
Index of
Last Check Item
ڰڰڰڰڰڰ
Information
of Last Check Item
TROUBLESHOOTING