Heating Pump Down Residual Operation - Daikin VRV Inverter K Series Manual

SI-05C.BOOK Page 33 Monday, November 6, 2000 4:13 PM
SiE-05C
1.8

Heating Pump Down Residual Operation

1.8.1 For RSXY 8, 10 K
If refrigerant is remaining in the accumulator when the compressor starts, liquid refrigerant is sucked into
the compressor, diluting the refrigerant machine oil and reducing the lubricating performance. To prevent
this, the pump-down operation discharges refrigerant from the low pressure side when the unit is not in
operation.
Residual operation may be carried out for 10 minutes under the following conditions when heating.
1. When outdoor temperature (R1T) is ≥ -5˚C and inverter discharge pipe temperature (R3-1T) < 95ºC,
< For products produced in and after August 1999 >
&
Thermostat
Compressor and
2. When the thermostat is ON during residual operation, residual operation is not carried out if the total of
Thermostat
Compressor and
outdoor unit fan
3. When outdoor temperature (R1T) < -5˚C and a stop command is received from the thermostat sensor,
Functions Inverter K Series
and a OFF by thermostat command is received with the compressor's continuous operation time being
10 minutes or less, residual operation is carried out for a maximum of 10 minutes.
Discharge pipe thermistor (R3-1T) on inverter side: 95˚C or lower
Outside air temperature thermistor (R1T) < 0˚C
When compressor continuous operating time is less than 10 minutes and thermostat is OFF, or
when stop command is received from remote controller
OR
Within 20 minutes after defrost or oil return operation
T0 (oil temperature) ≤ Te+10
Max. 10 min.
ON
OFF
ON
outdoor unit fan
OFF
1+2+3 is 10 minutes or more.
Max. 10 min.
ON
OFF
1
ON
OFF
Residual operation not carried out
if 1 + 2 + 3 is 10 minutes or more.
etc., residual operation is carried out for 10 minutes without fail. (Operation may however stop for
discharge pipe or high/low pressure safety. )
Operation may stop during the 10 minutes
residual operation due to protection discharge,
high/low pressure, etc.
Residual operation for 10 min.
Max. 10 min.
Residual
operation
2 3
Thermostat
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Functions
(VL006)
ON (VL007)
33