Carel uChiller UCHBP00000200

69
ENG
µchiller +0300053EN rel. 2.2 - 14.12.2021
Functions
The control diagram is shown below:
300053_065_R01
D
T
3
K
2.5
K
1.5
K
Min speed
Max speed
100%
Inverter
SP
Te (°C)
key
Max speed Modulating source fan:
max speed value
Min speed Modulating source fan:
min speed value
SP Control set point
DT Control diff erential
Tc max Maximum condensing temp.
Te Evaporation temperature
Fig. 5.t
In the graph, some off sets are expressed with a numerical value, indicating that they are not modifi able on the display but
rather are fi xed parameters. The current calculated set point value is displayed on the dashboard.
5.13.4 “Low noise” function
This function reduces the noise emitted by modulating fans by increasing the set point at night.
User Code Description Def Min Max UOM
S S020 Enable noise reduction 0/1=No/Yes 001-
S S021 Noise reduction time band: start hours 22 0 23 h
S S022 Noise reduction time band: start minutes 30 0 59 min
S S023 Noise reduction time band: end hours 8 0 23 h
S S024 Noise reduction time band: end minutes 30 0 59 min
S S025 Source fan: noise reduction set point 45.0 0.0 999.9 °C
5.13.5 Fan anti-blocking function
For systems intended to operate in cold climates, Chiller modulates fan speed so as to prevent the unit from shutting down
due to frost formation. The function is activated when the outdoor temperature falls below a threshold, and, instead of turning
off the fans, keeps then on at a minimum speed. If the outside temperature is reached when the fans are off , these are activated
at start-up speed for a certain time, and then switch to the minimum speed.
User Code Description Def Min Max UOM
S S016 Source fan: cold climate temperature threshold -0.5 -999.9 999.9 °C
S S017 Source fan: min cold climate speed 10.0 0.0 100.0 %
S S018 Source fan: cold climate speed at start-up 50.0 0.0 100.0 %
S S019 Source fan: cold climate speed at start-up time 5 0 300 s