PACD011001C2 Function
Function Urban Multi “MX1, ME1 Series” Using R-22 29
1.5.4 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/cm² (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/cm² (0.147MPa), operating frequency becomes 54Hz.
If low pressure becomes > 1.7 kg/cm² (0.167MPa), the heating lay-up operation is released.
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)
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