SiE-05C
Functions
Functions Inverter K Series
29
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.
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
Operation During
Pump Down Start
Note
1. Note 1: 30Hz (30Hz+OFF) for products produced after Aug. ‘99.
2.
∗
Note 2
: When heating, low pressure < 1.5 kg/cm
²
(0.147MPa)
→
running frequency 54Hz (54Hz +
OFF)
Low pressure > 1.7 kg/cm
²
(0.167MPa) [30 sec. continuous]
→
release
Y2S: Hot gas bypass solenoid valve
Y3S: Injection solenoid valve
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.
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.
Operation During
Heating Lay-Up
Start
Make the compressor’s upper limit frequency 60Hz (60Hz+OFF) for 10 minutes 20 seconds after the
compressor starts.
∗
If the low pressure becomes < 1.5kg/cm
²
(0.147MPa) within 10 minutes after starting, Y2S is actuated
and outdoor unit EV becomes 0 pulses. 10 minutes after start, the unit starts up as described below.
(8,10 Hp)
Y2S: Hot gas bypass solenoid valve
Y3S: Injection solenoid valve
∗
If low pressure becomes < 1.5 kg/cm
²
(0.147MPa), operating frequency becomes 54Hz.
If low pressure becomes > 1.7 kg/cm
²
(0.167MPa), the heating lay-up operation is released.
←
11 min. 30 sec.
→
1 min.
5 min.
30 sec.
30 sec.
4 min. 30 sec.
Compressor
42Hz
(42Hz+OFF)
42Hz
(42Hz+OFF)
42Hz
(42Hz+OFF) Note 1
30~106 Hz+OFF
PI control
∗
Note 2
Outdoor unit EV
0 pulses
0 pulses
0 pulses
SH control (Initial
opening 150 pulses)
Outdoor unit fan
H tap (H+ON)
H tap (H+ON)
H tap (H+ON)
H tap (H+ON)
Y2S
ON
ON
ON
OFF
ON/OFF
(LP protection
control)
Y3S, Y4S
ON
ON/OFF
(Td protection control)
ON/OFF
(Td protection control)
ON/OFF
(Td protection control)
4 min. 30 sec.
Compressor
PI control (upper limit 116Hz [116Hz+OFF])
∗
Outdoor unit EV
SH control (initial opening 150 pulses)
Outdoor unit fan
H tap (H+ON)
Y2S
ON/OFF (LP safety control)
Y3S
ON/OFF (Td safety control)
SI-05C.BOOK Page 29 Monday, November 6, 2000 4:13 PM
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