Mitsubishi Electric City Multi PURY-EM200YNW-A1, Service Handbook

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[5-2 Outdoor Unit Control ]
BS_05_M chapter 5 -
11
5
Cont
rol
5-2 Outdoor Unit Control
5-2-1 Overview
 The outdoor units are designated as OC in the order of capacity from large to small (if two or more units have the same ca-
pacity, in the order of address from small to large).
 The setting of outdoor unit can be verified by using the self-diagnosis switch (SW4).
 The OC determines the operation mode and the control mode, and it also communicates with the indoor units.
5-2-2 Initial Control
 When the power is turned on, the initial processing of the microcomputer is given top priority.
 During the initial processing, control processing of the operation signal is suspended. (The control processing is resumed after
the initial processing is completed. Initial processing involves data processing in the microcomputer and initial setting of each
of the LEV opening. This process will take up to 5 minutes.)
 During the initial processing, the LED monitor on the outdoor unit's control board displays S/W version → refrigerant type
→ Model and capacity → and communication address in turn every second.
5-2-3 Startup Control
 The upper limit of frequency during the first 3 minutes of the operation is 50 Hz.
 When the power is turned on, normal operation will start after the initial start-up mode (to be described later) has been com-
pleted (with a restriction on the frequency).
 In the Heating-Only or Heating-Main operation, the unit will not start when TH7 > 25°C. In the test run mode, the unit will start
when TH7 > 25°C.
SW4 (SW6-10:OFF) Display
 The unit is designated as the OC: "OC" appears on the display.
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
The figure at left shows that the switches 1 through 5 are set to ON and 6 through 10 are set to OFF.
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