MULTI TYPE
MULTI TYPE
MULTI TYPE
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(C)<br />
Heating operation<br />
Does heating<br />
indoor fan normally<br />
operate?<br />
Yes<br />
Is indoor PMV<br />
normal?<br />
Yes<br />
Is check valve<br />
of main<br />
discharge pipe<br />
normal?<br />
Yes<br />
Is there any interference<br />
of heat-exchanging of<br />
indoor unit?<br />
1. Filter clogging<br />
2. Heat exchanger<br />
clogging<br />
3. Air short circuit<br />
No<br />
Is SV5 circuit normal?<br />
Yes<br />
Are any indoor<br />
units in different<br />
refrigerant circuit<br />
connected?<br />
No<br />
Refrigerant overcharge,<br />
clogging, pipe breakage,<br />
abnormal overload<br />
No<br />
No<br />
Is connector<br />
connection and coil<br />
normal?<br />
No<br />
Yes<br />
Yes<br />
Is there<br />
clogging in any<br />
valves?<br />
No<br />
No<br />
Yes<br />
Is connector<br />
connection, condenser<br />
or fan motor normal?<br />
No<br />
Yes<br />
No<br />
Yes<br />
Are<br />
characteristics of<br />
sensor TC2 and TCJ<br />
resistance normal?<br />
(Check it using the<br />
miswiring check function<br />
of the outdoor unit.)<br />
No<br />
Yes<br />
Check indoor P.C. board.<br />
Faulty ➝ Replace<br />
Repair faulty parts.<br />
Repair faulty parts.<br />
Repair check valve.<br />
➝ Replace<br />
Eliminate the<br />
interference.<br />
Replace PMV body.<br />
Repair SV5 circuit.<br />
(Coil error, choke,<br />
disconnection of cables, etc.)<br />
Check and correct<br />
wiring.<br />
Replace TC2 or TCJ<br />
sensor.<br />
Check code Check code name<br />
Cause<br />
[P20] / [22]<br />
(AI-NET)<br />
High-pressure protective<br />
operation<br />
1. Pd sensor error<br />
2. Service valve closed.<br />
3. Indoor/outdoor fan error<br />
4. Indoor/outdoor PMV clogging<br />
5. Indoor/outdoor heat exchanger clogging<br />
6. SV2 circuit error<br />
7. SV4 circuit error<br />
8. SV5 circuit error<br />
9. Outdoor I/F P.C. board error<br />
10. Operation error of check valve of main discharge<br />
pipe<br />
11. Refrigerant overcharge<br />
Are service valves fully<br />
opened?<br />
No<br />
Open service valves fully.<br />
Yes<br />
Are<br />
characteristics of highpressure<br />
sensor<br />
normal?<br />
Yes<br />
No<br />
Reset power supply, and start a test operation<br />
corresponded to the season.<br />
Cooling operation (B)<br />
Cooling ➝ To (B)<br />
Heating ➝ To (C)<br />
Check parts.<br />
Failure ➝ Replace<br />
* 1. Pressure by pressure gauge (Check joint)<br />
2. Pressure display on 7-segment display<br />
3. Output voltage of I/F P.C. board<br />
If 1 and 2, 3 are different, an error of pressure sensor<br />
is considered.<br />
If 2 and 3 are different, check I/F P.C. board.<br />
Does<br />
cooling outdoor fan<br />
normally operate?<br />
Yes<br />
No<br />
Repair faulty parts.<br />
Is there<br />
any fan crack<br />
or coming-off?<br />
No<br />
Is outdoor PMV normal?<br />
1. Connector connection<br />
2. Wiring<br />
3. Coil<br />
4. Valve body<br />
5. Outdoor I/F P.C. board<br />
Yes<br />
No<br />
Connectors: PMV1: CN300,<br />
PMV2: CN301, PMV4: CN303<br />
Repair faulty parts.<br />
(Connector connection, fan IPDU,<br />
fan motor, cabling)<br />
Repair outdoor PMV.<br />
Yes<br />
Is there any<br />
interference of heatexchanging<br />
of outdoor unit?<br />
1. Heat exchanger clogging<br />
2. Air short circuit<br />
Yes<br />
Eliminate the interference.<br />
No<br />
Is SV2 bypass<br />
circuit normal?<br />
No<br />
Repair SV2 bypass circuit.<br />
Yes<br />
(Coil error, clogging, disconnection<br />
of wire, etc.)<br />
Is SV4 circuit normal?<br />
No<br />
Repair SV4 circuit.<br />
Yes<br />
(Coil error, clogging, disconnection<br />
of wire, etc.)<br />
Is check valve of<br />
main discharge pipe<br />
normal?<br />
Yes<br />
No<br />
Repair check valve. ➝ Replace<br />
Refrigerant overcharge, clogging, pipe<br />
breakage, abnormal overload<br />
222
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