Special Control; Startup Control - Daikin Super Multi Plus D-Series Service Manual

SiEBE18-526

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
BP unit electronic expansion valve
(operating room)
BP unit electronic expansion valve
(stopping room)
3.1.2 Startup Control in Heating 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
BP unit electronic expansion valve
(operating room)
BP unit electronic expansion valve
(stopping room)
Function
Operation
Differential pressure control
High pressure control
OFF
2000 pls
0 pls
ON
OFF
• 255 sec.
• Pc - Pe>0.4 MPa
or
(
&
• 75 sec
0 pls
0 pls
Operation
Differential pressure control
STEP8
ON
180 pls
0 pls
ON
ON
• 225 sec.
• Pc - Pe>0.4 MPa
or
(
&
• 40 sec
0 pls
0 pls

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
<
(Ta 20°C), or STEP 7 (Ta≥).
⎯
⎯
⎯
⎯
⎯
⎯
⎯
Remarks
Compressor operating frequency
increases by 2 step / 20 sec until
Pc - Pe>0.4 MPa.
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
61