Special Control; Startup Control - Daikin REYQ72 Serveice Manual

Special Control

3.

Special Control

3.1

Startup Control

This startup control is used to provide the following control to reduce the compressor load
resulting from liquid return or else during compressor startup, and also determine the position of
four way valves.
3.1.1 Startup Control in Cooling Operation
Actuator
Compressor
Outdoor unit fan
Four way valve 1
Four way valve 2
Main motorized valve (EV1)
Sub motorized valve (EV2)
Sub-cooling motorized valve (EV3)
Hot gas bypass valve (SVP)
Oil equalization valve (SVO)
Receiver charging valve (SVL)
Receiver discharge valve (SVG)
Discharge pipe stop valve (SVR)
Non-operating unit liquid pipe stop
valve (SVSL)
High pressure gas pipe pressure
reduction valve (SVC)
Ending conditions
Note 1. Hold : maintain the previous position before entering this operation.
Note 2. ON at starting immediately after power is on.
Note 3. SVO is open even independent outdoor unit installation.
48
Pressure equalization
before start-up
OFF 52Hz + OFF
OFF OFF
OFF OFF
Hold *Note 1 OFF
0 pls 1400 pls
0 pls 1400 pls
0 pls 0 pls
OFF ON
OFF ON
OFF OFF
OFF OFF
Hold Hold
ON OFF
Hold
OFF
*Note 2
1 min. 5 sec.
Starting control
Step1
Compressor operating frequency
increases by 2 step/20 sec. until Pc -
Pe > 58 psi
1-step/15 sec. increases with
Pc > 319 psi
1-step/15 sec. decreases with
Pc < 261 psi
OFF
OFF
1400 pls
1400 pls
0 pls
ON
ON *Note 3
OFF
OFF
OFF
OFF
OFF
• 320 sec.
or
• Pc - Pe > 58 psi
SiUS39-602
Step2
Function