iCOM
Controls Training and Service Manual
If the unit was operating in DX + FC Mode (and the FC valve is open), at the first
leaving of Phase 6 the “flow” will check (after the 600 seconds compressor off
time) if at the DT 3 (A138) checkpoint the actual unit temperature is above DT 3
(A138 see below). If true, then Freecooling will be disabled (Phase 10) for
maximum of 1 hour or until both compressors are off (Freecooling will be disabled
inside this 1 hour when 1 compressor restarts), and the compressor continues to
cycle between Phase 1, then Phase 2 and probably Phase 6. If the call for cooling
goes away, Phase 10 is reset, 1-hour timer.
Loss of Charge Protection
After Phase 1, once the pressure reaches the low pressure cut-out (single reading)
the “flow” moves to phase 8: Wait 5 minutes to reach one single reading above
Threshold 1. If OK move back to Phase 2, if NOK then move to Phase 9 and
sound Alarm (Code 3), stop compressors, leave LLSV open, no pump down; and
continue to wait a single reading to be above Threshold 1 to move to Phase 2.
This waiting phase will last forever or as long as there is a call for cooling. The
compressor may operate during the alarm is active, once the pressure conditions
allow for it.
Phases
Conditions
1
Winter Start (Low Pressure Time Delay)
2
Start of Freeze Protection (6 minutes Threshold Phase 2 ignored)
3
Freeze Protection (4 minutes of 3 minutes worth of averages)
4
Did not make Winter Start. Waiting on one reading above Threshold
Phase 1. LLSV open and compressor OFF. Five minute wait time.
5
Low Pressure Alarm (Code 1)
6
Compressor off for 10 minutes. LLSV Closed.
7
Freeze Protection Message (Code 2)
8
Off on Loss of Charge. Waiting on one reading above Threshold
Phase 1. LLSV open and compressor OFF. Five minute wait time.
9
Low Pressure Alarm (Code 3)
10
Disable Freecooling for one hour. Compressor(s) will operate during
this time.
See Flow Chart on next page.
40
Содержание Liebert iCOM
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