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UST500 CONTROL BOARD
50 06MC0074@00B0100
14/04/2010
COOL
see table 2b par. FE07…FE16
HEAT
see table 2b par. FE17…FE26
Diagram A
Diagram B
Diagrams for fan speed based on the regulation probe
Diagram C
Diagram D
Diagrams for fan speed based on the regulation probe selected, i.e. High Pressure (diagram C) / Low pressure (diagram D) or
external exchanger pressure.
Temp: External exchanger temperature
Temp: External exchanger temperature
Low Press. : Low pressure
High Press. : High pressure
Press.: External exchanger pressure
Press.: External exchanger pressure
Fan control in defrost
The external exchanger fan can be enabled in defrost mode. The function is active if: enabled by parameter (FE27 – Enable external
exchanger fan in defrost = 1). See table 2a.
Fan activation in defrost mode is useful because pressure at the external exchanger can reach alarm levels if the exchanger is not totally de-
iced.
To avoid the overpressure alarm being generated in this situation, if the pressure/temperature read by the probe is above FE28 – External
exchanger on set point in defrost, the fans are run at minimum speed.
The probe for fan control in defrost mode is selected by parameter FE30 – Select probe for external exchanger fan regulation in defrost.
Parameter
Description
Value
0
1
FE27
Enable external exchanger
fan on in defrost
0= fan (relay) off in
defrost.
Fan switches on at
end of defrosting.
1= fan (relay) on at minimum
speed depending on:
ͻ
configured probe for fan
control in defrost (see FE30)
ͻ
activation set-point (FE28)
ͻ
switching hysteresis (FE29)
Temp/Low Press/Press.
FE25
FE26
FE23
FE21
FE24
FE22
Speed (%)
FE19
FE18
FE17
OFF
Low Press/Press.
FE15
FE16
FE13
FE11
FE14
FE12
Speed (%)
FE09
FE08
FE07
OFF
High Press/Press
FE25
FE26
FE23
FE21
FE22
Speed (%)
FE19
FE18
FE17
OFF
FE24
Temp/High Press./ Press.
FE15
FE16
FE13
FE11
FE12
Speed (%)
FE09
FE08
FE07
OFF
FE14
Содержание UST500
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