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

Страница: 82 / 112

82 • dap4 User Manual
3. The Energy Saver/Auxiliary Chilled Water Cooling logic will be the same as the
chilled water cooling logic of the discharge air temperature control, this means dap4
uses a preset PID loop to control the CW valve to maintain a discharge air
temperature setpoint.
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. The following is the compressor staging sequence.
Compressors on cycle with energy saver
-- Variable speed compressor C1 comes on at Temperature Se temperature
de STS band. Once variable speed compressor comes on it will use PID
logic to maintain temperature se 1Deg F (to make sure CW is fully utilized).
-- Fixed speed compressor C2 (*) comes on at Temperature Se Temperature
De 1°F + STS DB and variable speed compressor C1 has operated at
95% for at least the C2 on delay. When C2 comes on, variable speed compressor
C1 will drop its speed to minimum speed for a delay modulation period.
Compressors off cycle during energy saver mode
-- Fixed speed compressor c2 (*) cycles off at Temperature Se STS DB for a
C2 off delay duration and variable speed compressor C1 runs at 100% .
-- Variable speed compressor C1 cycles off at Temperature Setpoint Compressor will
not violate its minimum runtime and short cycle regulation.
* This applies on dual compressor system.
3. Dehumidification mode
Dehumidification is controlled based on return air conditions and has five control modes: None,
1C In limit (one compressor within reheat limit), 1C No limit (one compressor without reheat limit),
2C In limit (two compressors within reheat limit) and 2C No Limit (two compressors without reheat
limits).
a) There are three dehumidification control modes for single compressor unit: None, 1C in
limit and 1C No limit.
b) There are five dehumidification control modes for dual compressors unit.
c) Reheat is required for dehumidification.
d) Dehumidification cooling can be controlled by relative humidity and/or dew point.