Pump Down Start; Heating Lay-Up Start - Daikin VRV Inverter K Series Manual

SI-05C.BOOK Page 29 Monday, November 6, 2000 4:13 PM
SiE-05C
1.4.3

Pump Down Start

If the compressor stops running with refrigerant still remaining in the accumulator, in order to prevent wet
operation at the next compressor starting, it will perform pump down start with a completely dry
accumulator, then it will operate normally.
Pump down start should be performed if the unit is in any of the conditions given below when pressure
equalizing control has been completed before start.
If R3T (R3-1T) is less than 95˚C and the unit is in any of the following conditions.
Operation During
Pump Down Start
Compressor
Outdoor unit EV
Outdoor unit fan
Y2S
Y3S, Y4S
Note 1. Note 1: 30Hz (30Hz+OFF) for products produced after Aug. '99.
2. ∗Note 2 : When heating, low pressure < 1.5 kg/cm² (0.147MPa) → running frequency 54Hz (54Hz +
1.4.4

Heating Lay-Up Start

If the compressor hasn't run for a long time and the refrigerant isn't circulated, foaming could cause a lack
of oil when the compressor is started at the next time. It should therefore perform heating lay-up start to
keep the low pressure from dropping too low in the following cases.
Operation During Make the compressor's upper limit frequency 60Hz (60Hz+OFF) for 10 minutes 20 seconds after the
Heating Lay-Up compressor starts.
∗ If the low pressure becomes < 1.5kg/cm² (0.147MPa) within 10 minutes after starting, Y2S is actuated
Start
and outdoor unit EV becomes 0 pulses. 10 minutes after start, the unit starts up as described below.
(8,10 Hp)
Compressor
Outdoor unit EV
Outdoor unit fan
Y2S
Y3S
∗ If low pressure becomes < 1.5 kg/cm² (0.147MPa), operating frequency becomes 54Hz.
If low pressure becomes > 1.7 kg/cm² (0.167MPa), the heating lay-up operation is released.
Functions Inverter K Series
Within 10 minutes of the compressor starting
Defrosting or during oil return
Within 20 minutes of completion of defrost or oil return
Outdoor air temperature is less than -5˚C
← 11 min. 30 sec. →
1 min.
42Hz
(42Hz+OFF)
0 pulses
H tap (H+ON)
ON
ON
OFF)
Low pressure > 1.7 kg/cm² (0.167MPa) [30 sec. continuous] → release
Y2S: Hot gas bypass solenoid valve
Y3S: Injection solenoid valve
When, after being power ON, the accumulated running time of the compressor does not exceed one
hour.
When the compressor has been stopped for more than 24 hours.
PI control (upper limit 116Hz [116Hz+OFF]) ∗
SH control (initial opening 150 pulses)
H tap (H+ON)
ON/OFF (LP safety control)
ON/OFF (Td safety control)
Y2S: Hot gas bypass solenoid valve
Y3S: Injection solenoid valve
5 min. 30 sec. 30 sec.
42Hz 42Hz
(42Hz+OFF) (42Hz+OFF) Note 1
0 pulses 0 pulses
H tap (H+ON) H tap (H+ON)
ON ON
ON/OFF ON/OFF
(Td protection control) (Td protection control)
4 min. 30 sec.
: http://splitoff.ru/tehn-doc.html
Functions
4 min. 30 sec.
30~106 Hz+OFF
PI control ∗ Note 2
SH control (Initial
opening 150 pulses)
H tap (H+ON)
OFF ON/OFF
(LP protection
control)
ON/OFF
(Td protection control)
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