2
8-4-2. Address setup and check procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
8-4-3. Address setup procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8-4-4. Check after address setup when central control system is connected. . . . . . . . . . . . . . 60
8-5. Troubleshooting in test operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8-5-1. A check code is displayed on the remote controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8-5-2. Operation from the indoor remote controller is not accepted, and a check code is
displayed on the 7-segment display of the interface P.C. board of the outdoor unit. . . . 62
8-5-3. There is no display of a check code on the 7-segment display on the interface P.C.
board of the outdoor unit, although there is indoor unit that is not accepting operation
from the indoor remote controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
8-5-4. In checking the number of connected outdoor units and connected indoor units after
address setup, a lower number of connected units is displayed. (There are
outdoor / indoor units that do not operate in a test operation.). . . .. . . . . . . . . . . . . . . . 63
8-6. Test operation check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
8-6-1. Fan check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
8-6-2. Cooling / Heating test operation check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
8-7. Service support function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
8-7-1. Check function for connecting of refrigerant and control lines . . . . . . . . . . . . . . . . . . . . 69
8-7-2. Function to start / stop (ON / OFF) indoor unit from outdoor unit. . . . . . . . . . . . . . . . . . 71
8-7-3. Error clearing function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
8-7-4. Remote controller distinction function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
8-7-5. Pulse motor valve (PMV) forced open / close function in indoor unit . . . . . . . . . . . . . . . 79
8-7-6. Pulse motor valve (PMV) forced function in outdoor unit . . . . . . . . . . . . . . . . . . . . . . . . 79
8-7-7. Solenoid valve forced open / close function in outdoor unit . . . . . . . . . . . . . . . . . . . . . . 80
8-7-8. Fan operation check in outdoor unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8-7-9. Manual adjustment function of outside temperature (TO) sensor . . . . . . . . . . . . . . . . . 82
8-7-10. Monitor function of remote controller switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
9-1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
9-2. Troubleshooting method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
9-3. Troubleshooting based on information displayed on remote controller
.
91
9-4. Check codes displayed on remote controller and outdoor unit (7-segment display on I/F
board) and locations to be checked . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
9-5. Diagnosis procedure for each check code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
9-6. 7-segment display function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
9-7. Sensor characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
9-8. Pressure sensor output check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
. . . . . . . . . . . . . . . . . . .
11 P.C. board exchange procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
11-1. Interface P.C. board replacement procedure (MCC-1639)
. . . . . . . . . . . . . . . . . . . 152
11-2. IPDU P.C. board replacement procedure (MCC-1655)
. . . . . . . . . . . . . . . . 154
12 Exploded diagram / parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
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10 Outdoor unit parts replacement methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
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