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102
The mcx152b has the EXV driver included, and it is controlled by stepper motor driver
Figure 68. Brick for EXV control
•
External Coil Control:
this section controls the 2 Fan condenser speed to keep the discharge pressure at the SP.
General Principle:
• Control fan speed and number of fans running based on compressor discharge pressure.
• Increase air flow (fan speed, number of fans) when pressure is higher than target.
• Reduce air flow (fan speed, number of fans) when pressure is lower than target.
• Increase target discharge pressure when the EEV is fully open (this may be happening for Data Center applications, and or chiller
starting in a building after being off for a long time and with high water temperature e.g. 80F).
• Eliminate constant fan cycling between 2 fans and 1 fan.
• Minimize fan cycling in low ambient conditions between no fans and one fan running to the extent possible (very frequent fan cycling
could cause MCHE condenser coil thermal fatigue failure).
• Information from Daikin/Clima-flex is that fans could go down to 5% of max speed.
• When running one fan only – run the fans that is nearer to the condenser inlet/outlet piping and turn off the one farther away.
Mother /Son Logic
Содержание Clima-Flex CLIC Series
Страница 23: ...iom clic cf eng www clima flex com 23 Dimensions Packaged Units Figure 14 Dimensional configuration 50 RT...
Страница 24: ...iom clic cf eng www clima flex com 24 Dimensions Packaged Units Figure 15 Dimensional configuration 75 RT...
Страница 25: ...iom clic cf eng www clima flex com 25 Dimensions Packaged Units Figure 16 Dimensional configuration 100 RT...
Страница 26: ...iom clic cf eng www clima flex com 26 Dimensions Packaged Units Figure 17 Dimensional configuration 125 RT...
Страница 27: ...iom clic cf eng www clima flex com 27 Dimensions Packaged Units Figure 18 Dimensional configuration 150 RT...
Страница 28: ...iom clic cf eng www clima flex com 28 Dimensions Packaged Units Figure 19 Dimensional configuration 175 RT...
Страница 29: ...iom clic cf eng www clima flex com 29 Dimensions Packaged Units Figure 20 Dimensional configuration 200 RT...
Страница 30: ...iom clic cf eng www clima flex com 30 Dimensions Packaged Units Figure 21 Dimensional configuration 250 RT...
Страница 31: ...iom clic cf eng www clima flex com 31 Dimensions Packaged Units Figure 22 Dimensional configuration 250 RT...
Страница 39: ...iom clic cf eng www clima flex com 39 Electrical Data...
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Страница 53: ...iom clic cf eng www clima flex com 53 R454B Electrical Data Figure 38 RS485 communication...
Страница 57: ...iom clic cf eng www clima flex com 57 R454B Electrical Data Figure 44 Fan controller gas leakage sensor...
Страница 77: ...iom clic cf eng www clima flex com 77 Clic R454b Unit This unit use the R454B Refrigerant...
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