Inspection Of Pcb; Confirmation Of Operating Value Of Protection Devices And Automatic Operation Devices - Hitachi SAMURAI Series Service Manual

4 Troubleshooting

Inspection of PCB

4.2 Inspection of PCB
The standard setting of switches, etc., on the PCB is as Control System
Confirm that they are being set correctly.
4.3 Confirmation of operating value of protection devices and automatic
operation devices
The activation values of protection devices are as follows:
Low/High pressure interruption device
Overcurrent relay (for compressor)
Suction gas decrease prevention control
Compressor internal thermostat
Control for prevention of discharge gas overheat
Fusible plug
Control circuit fuse
Safety valve (for compressor)
The setting values of automatic operation devices are as follows.
Item (Unit)
Time settings for startup
control
?
N O T E
• (*) The operation order of the cold water circulation pump is output at the same time that chiller unit operation starts.
• Set a time that allows to ensure a flow of cold water upon activation of the cold water circulation pump.
91 SMGB0120 rev.0 - 11/2017
Name
High pressure
Low pressure
Time guard setting min
Startup unload min
chapter in the Installation and Operation Manual.
230V Type
RCME-40WH1 100A
RCME-50WH1 130A
RCME-60WH1 160A
RCME-70WH1 160A
2.10MPa (Diameter Ø 35mm)
Setting value
Variable: 30 s ~ 10 min (Standard value: 30 s) (*)
1 min
Operating value
2.02MPa
(Manual recovery)
0.13MPa or below
(Electronic control)
0.01MPa or below
(Electronic control)
400V Type
48A
55A
65A
80A
-5ºC
115ºC
140ºC
72ºC
10A, 5A, 3A
Notes
Electronic
control
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