Hitachi SAMURAI Series Service Manual page 139

4. Troubleshooting
Troubleshooting by alarm code
13-13
Alarm code
C1-13
Alarm stop reason
Cold water temperature falls below 1ºC. (only enabled in cooling)
PCBc (CPU PCB) PCN12 short line is disconnected
N O T E
• In case of detection by inlet water temperature thermistor or in case of detection by disconnection of PCN12 short line
"13-13"
• In case of detection by outlet rear thermistor (for protection) or outlet water temperature thermistor (for control) "C1-13"
PCB monitoring position
PCBc (CPU PCB) CN4 (Inlet water temperature thermistor (Twi)), CN5 (Outlet water temperature thermistor (for water
temperature control Two1))
PCBd (I/O PCB) CN25 (Outlet rear thermistor Two2(for protection))
PCBc (CPU PCB) PCN12 (Short line)
Cold water
temperature has
actually dropped under 1ºC,
due to low inlet water temperature,
lowered low pressure, etc.
(Confirmed from data
immediately before)
No
The connection and
insertion of connector
PCBc (CPU PCB) and PCBd
(I/O PCB) are correct
Yes
Please remove
the connectors and
measure thermistor resistance.
Is resistance value
normal?
Yes
Check PCBc (CPU PCB)
and PCBd (I/O PCB)
N O T E
• There is 1 inlet temperature thermistor attached to each chiller unit.
• There are 2 thermistors for detection of outlet water temperature attached to each chiller unit.
• The relation between detected thermistor and alarm indication, as well as their connected PCB codes are shown in the
table below.
Abnormality code
C1-13
13-13
131
SMGB0082 rev.1 - 07/2015
Freeze protection · Freeze prevention
Yes
No
Correction of
connections
Replace thermistor
Detected thermistor
Outlet rear thermistor
Two2 (rear side (for protection))
Outlet water temperature thermistor
Two1 (piping side (for control))
Inlet water temperature thermistor Twi
Adjustment of water amount (inlet-outlet
water temperature)
Clogging of water strainer
Adjustment of reverse rotation of pump
Adjustment of cold water thermo setting
value. Shall be within usage range
Clogging of water side heat exchanger
PCB code Connector code
PCBd CN25
PCBc CN5
PCBc CN4
4