Bs Changeover Control - Daikin VRV K Manual

SI-95.BOOK Page 25 Friday, March 31, 2000 10:59 AM
Si-95

1.11 BS Changeover Control

The solenoid valve of the BS unit is switched according to the indoor unit operating condition.
Cooling
Heating
Condition
When the solenoid is operable, if the operating condition differs from the solenoid condition, the solenoid is
switched according to the above table.
However, the following conditions take precedence.
∗1 : Condition 2 results in heating stop units when no unit in the system is in cooling operation.
∗2 : Condition 1 results when a unit connected to the BS unit is in heating thermostat ON condition
Functions Inverter K Series
Normal operation
Oil return, defrost
Condition 1
Oil return, defrost complete
Condition 2
Indoor unit operating condition
1 Cooling
Heating stop ∗1
2 Heating thermostat OFF
Heating thermostat ON
3 Discharge oil return
4 Suction oil return
Defrost
during simultaneous cooling/heating operations.
Oil return, defrost
Condition 3
Condition 4
Y3S Y2S Y1S
OFF ON OFF
∗2
ON OFF
OFF OFF OFF
ON ON OFF
Functions
Discharge defrost
Discharge oil return
Suction defrost
Suction oil return
(VF006)
ON: Open
OFF: Closed
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