Data Aire dap4 touch, Инструкция по установке, эксплуатации и обслуживанию

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79 • dap4 User Manual
3. The Energy Saver/Auxiliary Chilled Water Cooling logic will be the same and
compressor rules for short-cycle time will not be violated.
4. Low discharge temperature alarm limit must be set in menu K-Alarms & Limits.
If Discharge temperature drops below this limit, compressors will be inhibited for at
least 15 minutes and discharge temperature rises above this limit.
5. If discharge temperature drops below the limit while the variable speed compressor
finishing its minimum runtime the CW should close until discharge temperature rises
above the limit.
6. When DX cooling requires, the compressors will stage on as follows:
Compressors on cycle
-- Variable speed compressor C1 comes on at Temperature Se Temperature
De 1+ STS DB. For instance: SP=72, DB=2 and STS=0.3, the C1
compressor will on at 75.3°.
-- Once variable speed compressor comes on it will ramp up its speed maximum
speed for delay modulation then uses PI logic to maintain se1°F.
-- Fixed speed compressor C2 comes on at Temperature Se Temperature
De 2ºF + STS DB and variable speed compressor has run at 95% speed
for a C2on delay. This step only applies to dual compressor system.
For instance: SP=72, DB=2 and STS=0.3, the C2 compressor will on at 76.3°.
Compressors off cycle
-- Fixed speed compressor C2 cycles off at Temperature Se 2ºF, variable speed
compressor C1 continues to run at 100%. For instance: SP=72, the C2 compressor
goes off at 74 degrees.
-- Variable speed compressor C1 starts to ramp down to minimum speed when return
temperature reaches se 1°F.
-- Variable speed compressor cycles off at Temperature Setpoint.
-- CW Valve will close 10% for every 0.1 Deg F below the setpoint plus 1°F and
completely close at setpoint.
-- Compressor will not violate its minimum runtime.
* This applies on dual compressor system.
2. Discharge Air Temperature Control Mode
a) Single DX circuit - One variable speed compressor system
-- Compressor settings type in dap4 Factory Settings menu is programmed to “Var. Sp”
and Control mode is set to “Supply”.
-- There is a five (5) minute delay between start-to-start of the compressor. The delay
will be increased to six (6) minutes for one (1) hour following the detection of a
short-cycle condition even if the short cycle alarm is disabled using a short cycle
alarm menu.
-- There is a two (2) minute delay between stop-to-start of the compressor.
-- Once compressor C1 comes on, it must remain on for a minimum runtime even
setpoint satisfies.