Carel uChiller UCHBP00000200

52
ENG
µchiller +0300053EN rel. 2.2 - 14.12.2021
Functions
5.1.2 Proportional control
If the desired control is only proportional to the water outlet or return temperature, consider the relationship:
For example, to have a proportional band of 2K, set the value of Kp to 50.
The following are the parameter settings required to control the return temperature:
User Cod. Description Setting UOM Note
S U036 Control probe at start-up - 0=Return 1=Delivery 0 - -
S U037 PID control delay at start-up/operation 180 s Not signifi cant
S U038 Control probe in operation - 0=Return 1=Delivery 0 -
S U039 PID at start-up: Kp 50.0 - => Proportional band = 2K
34.0 => Proportional band = 3K
25.0 => Proportional band = 4K
20.0 => Proportional band = 5K
S U040 PID at start-up: Ti - 0: integral action disabled 0 s
S U041 PID at start-up: Td - 0: derivative action disabled 0 s
S U042 PID in operation: Kp =U039 s Same as Kp at start-up
S U043 PID in operation: Ti - 0: integral action disabled 0 s
S U044 PID in operation: Td - 0: derivative action disabled 0 s
Tab. 5.c
5.1.3 Set point compensation
Chiller adjusts the set point based on the outside temperature.
Notice: this function can only be enabled if the outside temperature probe is fi tted.
The compensation (positive or negative) is determined by:
1. start compensation start (in cooling/heating);
2. end compensation threshold (in cooling/heating);
3. maximum compensation value (in cooling/heating).
User Code Description Def Min Max UOM
S U010 Enable set point compensation: 0/1=no/yes 001-
U SEtC Cooling set point 7.0 U006 U007 °C/°F
S U011 Cooling compensation: start 25.0 -99.9 999.9 °C
S U012 Cooling compensation: end 35.0 -99.9 999.9 °C
S U013 Cooling compensation: maximum value 5.0 -99.9 999.9 K
U SEtH Heating set point 40.0 U008 U009 °C/°F
S U014 Heating compensation: start 5.0 -99.9 999.9 °C
S U015 Heating compensation: end -10 -99.9 999.9 °C
S U016 Heating compensation: maximum value 5.0 -99.9 999.9 K
Compensation in cooling:
Ext. temp.
Set point
Std set
T1 T2
300053_050_R01
D
T
Key
Ext. Temp. Outside temperature
Std set Control set point
T1 Outside temperature to start compensation in cooling mode
T2 Outside temperature to end compensation in cooling mode
DT Maximum compensation value in cooling mode
Fig. 5.a
Compensation in heating:
Ext. temp.
Set point
Std set
T
2
T
1
300053_051_R01
D
T
Key
Ext. Temp. Outside temperature
Std set Control set point
T1 Outside temperature to start compensation in heating mode
T2 Outside temperature to end compensation in heating mode
DT Maximum compensation value in heating mode
Fig. 5.b