Mitsubishi Electric City Multi CMB-WP108V-G, Service Manual

Page: 112 / 301

[
VII
Control ]
- 103 - HWE1113B GB
Control at Initial Start-up
-8- Control at Initial Start-up
Œ
When started up for the first time before 12 hours have elapsed after power on, the unit goes into the initial startup mode.
Œ
At the completion of the initial operation mode, the outdoor unit will go into the normal control mode.
Œ
The initial operation mode will start when the outdoor unit connected to the HBC controller in air vent operation starts opera-
tion (the 4th step).
1. Flowchart of initial operation
Control Method
-9- Control Method
The control system configuration for the PURY models is shown in the chart below.
50 F 60Hz
or F < 50Hz
Initial startup mode starts.
Completed in the integrated operation time of 35 minutes.
Initial startup mode complete
or the discharge superheat (TH4 - Tc) is detected (within
5 minutes of startup) that remains above approximately
20°C [36°F] for one minute .
Completed in the integrated operation time of 90 minutes.
Control method
Data signal exchange
between system equipment
Calculation, processing
System control
Adjustment of refrigerant flow rate
Adjustment of rotation speed of
compressor or fan
Non-polar 2-wire
serial communication
method
16-bit CPU
microcomputer operation
processing
Autonomous distributed
control system
(F2-VPM control)
Rotation speed control of compressor
or fan depending on the refrigerant
pressure value and the changing speed
Capacity control for each port according
to the load
Water distribution control according to the
operation mode
Outdoor unit
Daisy-chained
non-polar 2-wire
transmission line
HBC controller
*
Autonomous distributed control system : A system that consists of two independent sub control systems, instead of a single
centralized control system, each of which performs the control function independently
to maintain the control of the entire system.