Special Control; Startup Control - Daikin R-410A Service Manual

SiBE39-402A

3. Special Control

3.1

Startup Control

On activation, following control is performed to lighten load of the compressor by back liquid and
the like. Also, the position of the four way valve is defined.
3.1.1 Startup Control in Cooling Operation
Actuator
Compressor
Outdoor unit fan
Four way valve
Main electronic expansion valve (EV1)
Subcooling electronic expansion valve
(EV2)
Hot gas bypass valve (SVP)
Receiver gas discharging valve (SVG)
Ending conditions
3.1.2 Startup Control in Heating Operation (H/P model only)
Actuator
Compressor
Outdoor unit fan
Four way valve
Main electronic expansion valve (EV1)
Subcooling electronic expansion valve
(EV2)
Hot gas bypass valve (SVP)
Receiver gas discharging valve (SVG)
Ending conditions
Function
Operation
Differential pressure control
High pressure control
OFF
1400 pls
0 pls
ON
OFF
• 230 sec.
• Pc - Pe>0.4 MPa
or
(
&
• 45 sec
Operation
Differential pressure control
STEP8
ON
180 pls
0 pls
ON
OFF
• 145 sec.
• Pc - Pe>0.4 MPa
or
(
&
• 15 sec

Special Control

Remarks
Compressor operating frequency
increases by 2 step / 20 sec until
Pc - Pe>0.4 MPa.
Initial fan speed is set to STEP 0.
1-step increase with Pc>2.1 MPa
1-step decrease with Pc<1.8 MPa
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⎯
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Remarks
Compressor operating frequency
increases by 2 step / 20 sec until
Pc - Pe>0.4 MPa.
⎯
⎯
⎯
⎯
⎯
⎯
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