Carel uChiller UCHBP00000200

68
ENG
µchiller +0300053EN rel. 2.2 - 14.12.2021
Functions
5.13.2 Control in chiller mode
Fan control may be modulating or ON-OFF and is based on the saturated temperature value, equivalent to the condensing
pressure, limited by Tc max.
User Code Description Def Min Max UOM
S C017 Max high pressure threshold (HP) 65.0 0.0 999.9 °C
S S028 Source fan in cooling: set point 30.0 -999.9 999.9 °C
S S034 Source fan: diff erential in cooling 15.0 0.0 99.9 K
S S036 Modulating source fan: min speed value 20.0 0.0 100.0 %
S S037 Modulating source fan: max speed value 80.0 0.0 100.0 %
The control diagram is shown below:
300053_063_R01
DT5.0
K
1.5
K
Min speed
Max speed
100%
Inverter
SP
T
c max
T
c (°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 temperature
Tc Condensing temperature
Fig. 5.r
In the graph, some off sets are expressed with a numerical value, indicating that they are not modifi able but rather are fi xed
parameters. The current calculated set point value is displayed on the dashboard.
Set point control
In chiller mode, a specifi c condensing temperature set point for starting the compressor can be set to a value that is higher than
the nominal set point, so that the compressor can reach steady operation more quickly. The transition to the nominal set point
is made gradually over a time equal to the delay at start-up.
User Code Description Def Min Max UOM
S S031 Source fan in cooling: set point at start-up 45.0 0.0 999.9 °C
S S032 Source fan: delay at start-up in cooling 240 0 999 s
300053_063_R01 300053_064_R01
D1
Cnd SP
Start SP
Nom SP
Comp ON
t (s)
Key
Cnd SP Condensing temperature set point
Start SP Set point at start-up
Nom SP Nominal set point
Cmp ON Compressor activation
D1 Delay at start-up
Fig. 5.s
5.13.3 Control in heat pump mode
Fan control may be modulating or ON-OFF and is based on the saturated temperature value, equivalent to the evaporation
pressure.
User Code Description Def Min Max UOM
S C017 Max high pressure threshold (HP) 65.0 0.0 999.9 °C
S S029 Source fan in heating: set point 10.0 0.0 99.9 °C
S S035 Source fan: diff erential in heating 5.0 0.0 99.9 K
S S036 Modulating source fan: min speed value 20.0 0.0 100.0 %
S S037 Modulating source fan: max speed value 80.0 0.0 100.0 %