Troubleshooting By Alarm Code - Hitachi SAMURAI Series Service Manual
Water cooled water chillers -modular-r134a-screw type
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Also See for SAMURAI Series:
- Service manual (137 pages) ,
- Service manual (174 pages) ,
- Manual (118 pages)
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4 Troubleshooting
Troubleshooting by alarm code
4.8 Troubleshooting by alarm code
C1-H1
Alarm code
Alarm stop reason
Discharge pressure (Pd) increases up to 2.02MPa, activating high pressure switch (63H).
PCB monitoring position
PCBd (I/O PCB) PCN204 (High pressure interruption device (63H))
Operation control results
in immediate alarm
No
High pressure
switch (63H) is
activated.
No
Check of PCBd (I/O PCB)
97
SMGB0120 rev.0 - 11/2017
High Pressure Switch
Yes
High pressure
switch (63H) is being
reset
Yes
The connection and
insertion of connector
PCN204 to PCBd (I/O
PCB) are correct
Yes
Remove the wires
inserted in PCN204
on PCBd (I/O PCB) and
check power conduction.
Is there power
conduction?
Yes
Check of PCBd (I/O PCB)
I/O PCB is normal
Yes
No
Press the reset button of
high pressure switch
No
Revision of connections
Check of high pressure
No
switch (63H) (Internal
disconnection)
Check of wiring
(disconnection)
In case of cooling operation
Excessive refrigerant load
In case of heating operation
Insufficient volume of water
Reverse rotation of pump
Air mixture
Formation of lime deposit in water
side heat exchanger
Clogging of water strainer
Malfunction of expansion valve
Opening of liquid stop valve
forgotten
Excessive refrigerant load
4
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Table of Contents
Troubleshooting
