Special Control; Startup Control - Daikin RXYQ72 Serivce Manual

Special Control

3.

Special Control

3.1

Startup Control

3.1.1 Startup Control in Cooling Operation
Actuator
Compressor
Outdoor unit fan
Four way valve
Main motorized valve (EV1)
Subcooling motorized valve (EV2)
Hot gas bypass valve (SVP)
Oil equalization valve (SVO)
Receiver gas charging valve (SVL)
Receiver gas discharging valve (SVG)
Non-operating unit gas discharging
valve (SVSG)
Non-operating unit liquid pipe stop valve
(SVSL)
Ending conditions
3.1.2 Startup Control in Heating Operation
Actuator
Compressor
Outdoor unit fan
Four way valve
Main motorized valve (EV1)
Subcooling motorized valve (EV2)
Hot gas bypass valve (SVP)
Oil equalization valve (SVO)
Receiver gas charging valve (SVL)
Receiver gas discharging valve (SVG)
Non-operating unit gas discharging
valve (SVSG)
Non-operating unit liquid pipe stop valve
(SVSL)
Ending conditions
40
Operation
Differential pressure control
High pressure control
OFF
0 pls
0 pls
ON
ON
OFF
OFF
OFF
ON
• 200 sec.
or
• Pc - Pe>58 psi
Operation
Differential pressure control
STEP9
ON
200 pls
0 pls
ON
ON
OFF
OFF
OFF
ON
• 200 sec.
or
• Pc - Pe>58 psi
Remarks
Compressor operating frequency
increases by 1 step / 20 sec until
Pc - Pe>58 psi
Initial compressor operating frequency is
set to STEP 1.
1-step increase with Pc>319 psi
1-step decrease with Pc<261 psi
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Remarks
Compressor operating frequency
increases by 1 step / 20 sec until
Pc - Pe>58 psi
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SiUS39-601
Function