Special Control; Startup Control - Daikin VRV II RXYQ5MY1B Service Manual

SiE39-404

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 discharging valve (SVG)
Non-operating unit liquid pipe stop
valve (SVSL)
Ending conditions
∗ In the case of multi-outdoor-unit system, both master and slave units perform the operations listed in the table
above.
∗ Actuators are based on RXYQ16M.
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 discharging valve (SVG)
Non-operating unit liquid pipe stop
valve (SVSL)
Ending conditions
∗ In the case of multi-outdoor-unit system, both master and slave units perform the operations listed in the table
above.
∗ Actuators are based on RXYQ16M.
Function
Operation
Differential pressure control
High pressure control
OFF
1400 pls
0 pls
ON
ON
OFF
ON
• 200 sec.
or
• Pc - Pe>0.4 MPa
Operation
Differential pressure control
STEP9
ON
200 pls
0 pls
ON
ON
OFF
ON
• 200 sec.
or
• Pc - Pe>0.4 MPa

Special Control

Remarks
Compressor operating frequency
increases by 1 step / 20 sec until
Pc - Pe>0.4 MPa.
Initial compressor operating frequency
is set to STEP 1.
1-step increase with Pc>2.2 MPa
1-step decrease with Pc<1.8 MPa
⎯
⎯
⎯
⎯
In the case of multi-outdoor-unit
system, this valve repeats ON/OFF
operation at regular intervals of time to
equalize the oil level of each outdoor
unit.
⎯
⎯
Remarks
Compressor operating frequency
increases by 1 step / 20 sec until
Pc - Pe>0.4 MPa.
⎯
⎯
⎯
⎯
⎯
In the case of multi-outdoor-unit
system, this valve repeats ON/OFF
operation at regular intervals of time to
equalize the oil level of each outdoor
unit.
⎯
⎯
85