12-31
CONTROL SYSTEM
SM CKDDCI 2-A.3 GB
12.7.4.10 Gas Block Test procedure
This test is used for technician to check the blockage within the system. The test is operates in heat
mode and the technician should close the liquid valve manually.
Start the operation by navigating the HMI.
1.
2.
Note -
The test is not operable when OAT<5
C. If so, the display will show: “nA”.
A/C will start operate in Heat Mode.
3.
After about 1 minute (finish of pre-test), the display will show:
4.
At this stage - close the Liquid valve.
After about 1 minutes, as soon as the low pressure will drop to below 1.5 bar(g), the
5.
LPS - Low pressure status will blink:
At this stage the technician should observe if any ice accumulates on the coil or EEV
6.
section that may indicate on any gas block.
The test will end after about 15 minutes. This acts as percussion in case the unit will not be
7.
shut OFF (or not closes the valves).
12.7.4.11 Communication Test procedure
Check if communication fault occurs between the Indoor and outdoor units.
Note
– Require test tool (560Ohm) P/N 414765.
Start the operation by navigating the HMI.
Disconnect the IDU-ODU communication connector from main board of ODU.
1.
Connect test tool between the 2 pins.
2.
After about 30sec, the display will show “PASS” or “FLt”:
3.
If “FLT” Replace ODU main board. If “Pass” and still no communication, replace wires or
4.
indoor controller.
