Daikin VRV III REYQ8PY1, Service Manual

Page: 124 / 452

Si37-701 Special Control
Function 113
3.2 Large Capacity Start Up Control (Heating)
For startup, oil return operation, or setup after defrosting, start up multiple compressors at a high speed according to the
conditions of indoor units with thermostat ON, thus maximizing the equipment capacity.
[Starting conditions]
•
The system starts heating operation with thermostat ON at a high load.
•
The system completes defrosting operation.
•
The system switches the operation mode from cooling to heating or
simultaneous cooling and heating operation.
[Control]
1. Start multiple INV compressors in the system at one time.
2. Start multiple STD compressors in the system at intervals of 15 seconds.
Start up STD compressors at intervals of 15 seconds.
INV
STD
0
5
10
20
15
25
Pressure
Pc
Pe
Time
Number of
compressors
3
9
7
4
5
6
8
OR