Download Daikin BRC15A61 Specifications

Si38-304
Special Control
3.6.2 Stopping Operation of Slave Units During Master Unit is in Operation
With Multi-Outdoor-Unit System
In cooling operation: The system operates in Mode A or Mode B listed in the table below.
Actuator
Mode-A operation
Mode-B operation
Compressor
OFF
OFF
Outdoor unit fan
STEP4
OFF
Four way valve
OFF
Holds ON
Main motorized valve (EV1)
150 pls to 300 pls
0 pls
Subcooling motorized valve (EV2)
0 pls
0 pls
Hot gas bypass valve (SVP)
OFF
OFF
Oil equalization valve (SVO)
OFF
OFF
Receiver gas charging valve (SVL)
OFF
OFF
Receiver gas discharging valve
(SVG)
OFF
OFF
Non-operating unit gas discharging
valve (SVSG)
ON
ON
Non-operating unit liquid pipe stop
valve (SVSL)
OFF
ON
Mode transition conditions
To Mode B when Tc-Tl >0.27×(Tc - Ta) +6
To Mode A when gas shortage signal
is sent from indoor unit
Ending conditions
Slave units are required to operate.
In heating operation: The system operates in Mode A or Mode B listed in the table below. (H / P model only)
Actuator
Mode-A operation
Mode-B operation
Compressor
OFF
OFF
Outdoor unit fan
STEP2
STEP2
Four way valve
ON
ON
Main motorized valve (EV1)
0 pls
0 pls
Subcooling motorized valve (EV2)
0 pls
0 pls
Hot gas bypass valve (SVP)
OFF
OFF
Oil equalization valve (SVO)
OFF
OFF
Receiver gas charging valve (SVL)
ON
OFF
Receiver gas discharging valve
(SVG)
OFF
OFF
Non-operating unit gas discharging
valve (SVSG)
ON
ON
Non-operating unit liquid pipe stop
valve (SVSL)
OFF
ON
Mode transition conditions
To Mode B when Tc-mean temperature of
indoor unit liquid pipes>10°C
To Mode A when motorized valve of
operating outdoor unit fully opens.
Ending conditions
Slave units are required to operate.
∗ Mode A or B operation
Operating
unit
Stopping
unit
 Mode A : Operating unit collects refrigerant.

 Mode B : Stopping unit storage refrigerant.
The changeover operation for mode A and B is performed for the reason that the required refrigerant amount varies
depending on the indoor unit operation capacity.
Function
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