SM-18006
3-37
TROUBLESHOOTING
(2) Alarm Log Tracking Function of Service Checker
This function works with compatible service checker PSH-4 connected to Control PCB of water source
unit. Recorded alarm log data of water source unit can be collected.
Refer to the manuals of service checker for details.
● Outline of the Function
With this function, operation data just before unit stoppage by alarm activation can be collected to
analyze more details for the cause identication.
(a) In case of main water source unit stop with alarm, 10 operation data logs up to the alarm timing with
5 seconds interval are recorded in EEPROM on the Control PCB of main water source unit.
(b) Example of system connection is shown in the gure below. Operation data of the main outdoor unit,
the rst sub outdoor unit and the rst 16 indoor units are recorded.
5sec
5sec 5sec 5sec 5sec 5sec 5sec 5sec 5sec
Main
ODU
1st
IDU
2nd
IDU
16th
IDU
64th
IDU
17th
IDU
1st
Sub
ODU
2nd
Sub
ODU
3rd
Sub
ODU
● Service Checker Display Items
Items in the following table can be identied from the service checker.
Water Source Unit Information
Indication Description
Alarm Output Date Alarm Output Date
Alarm Output Time Alarm Output Time
Alarm Code Alarm Code
Unit No. Unit Number
Cycle State Cycle State (Stop/Cooling/Heating/Defrost)
Run State Operation State
HEX State Heat Exchanger State
Pro.Code Protection Code
Pro.Level Protection Level
H1 Inverter 1 Compressor Frequency (MC1) (Hz)
H2 Inverter 2 Compressor Frequency (MC2) (Hz)
oE1 Expansion Valve (MV1) Opening (%)
EVB Bypass Expansion Valve (MVB) Opening (%)
MV3 Inverter Cooling Circuit Expansion Valve Opening (%)
MV4 Plate-type Heat Exchanger Expansion Valve Opening (%)
Pd Discharge Gas Pressure (psi/MPa)
Ps Suction Gas Pressure (psi/MPa)
Td1 Discharge Gas Temp. for Compressor 1 (
o
F/
o
C)
Td2 Discharge Gas Temp. for Compressor 2 (
o
F/
o
C)
TdSH1 Discharge Gas Superheat 1 (
o
F/
o
C)
TdSH2 Discharge Gas Superheat 2 (
o
F/
o
C)
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