Normal Operation Control - intensity VRF V5 Series Service Manual

5 Normal Operation Control

5.1 Component Control During Normal Operation
Table 3-5.1: Component control during normal cooling operation
Component
Inverter compressor A
Inverter compressor B
DC fan motor A
DC fan motor B
Electronic expansion valve A
Electronic expansion valve B
Four-way valve
Solenoid valve (liquid refrigerant injection)
Solenoid valve (oil balance)
Solenoid valve (fast defrosting)
Solenoid valve (EXV bypass)
Table 3-5.2: Component control during heating operation
Component
Inverter compressor A
Inverter compressor B
DC fan motor A
DC fan motor B
Electronic expansion valve A
Electronic expansion valve B
Four-way valve
Solenoid valve (liquid refrigerant injection)
Solenoid valve (oil balance)
Solenoid valve (fast defrosting)
Solenoid valve (EXV bypass)
5.2 Compressor Output Control
The compressor rotation speed is controlled according to the load requirement. Before compressor startup, the outdoor
units first estimate the indoor unit load requirement according to the nominal capacity of indoor units currently running,
and then correct for ambient temperature. The compressors then start up according to the corrected load requirement.
During operation the compressors are controlled according to the nominal capacity of indoor units currently running and
the indoor unit heat exchanger temperatures. If the actual load requirement can be provided by one unit alone, then only
one unit starts up. If the actual load requirement requires all outdoor unit modules to operate, the weighted average
actual load requirement is sent to each module and each module operates according to this distributed load
requirement.
5.3 Compressor Step Control
The running speed of the compressors in rotations per second (rps) is half the frequency (in Hz) of the electrical input to
Wiring
8-12HP 14-22HP
diagram label
COMP A
●
COMP B
FANA
●
FANB
EXVA
●
EXVB
ST1
●
SV2
●
SV4
●
SV5
●
SV6
●
Wiring
8-12HP 14-22HP
diagram label
COMP A
●
COMP B
FANA
●
FANB
EXVA
●
EXVB
ST1
●
SV2
●
SV4
●
SV5
●
SV6
●
V5 X VRF 460V 60Hz
Control functions and states
●
Controlled according to load requirement
●
●
Controlled according to discharge pressure
●
Position (steps) from 0 (fully closed) to 480 (fully
●
open), controlled
●
temperature
Off
●
Only open if discharge temperature > 100
●
Open regularly
●
Off
●
Only open if pressure > 3.6MPa
●
Control functions and states
●
Controlled according to load requirement
●
Controlled according to outdoor heat exchanger pipe
●
temperature
●
●
Position (steps) from 0 (fully closed) to 480 (fully
open), controlled according to discharge superheat
●
On
●
Only open if discharge temperature > 100
●
Open regularly
●
Open during defrosting operation
●
Off
●
according to discharge
o C
o C
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