Carel µC2 User Manual

48
r01 r01 + r29
on
off
r01 r01 + r02
on
off
r03 - r04 r03
on
off
r03 - r30 r03
on
off
1 2
3
5 5
5 5
4
E N G L I S H
µC
2
- +030220731 - rel. 1.2 - 26.10.2007
- Buffer tank suppression (low load)
r27: The low load condition is determined when only one compressor is started and then is stopped after
operating for less than the time set for parameter r28.
The settings are:
r27=0: the function is disabled;
r27=1: enabled only in chiller mode;
r27=2: enabled only in heat pump mode;
r27=3: enabled in chiller and heat pump modes.
- Minimum compressor on time to determine low load condition
r28: This parameter represents the minimum compressor on time below which the low load condition is
determined. Whenever the compressor stops, the controller analyses the load status.
If already in low load condition, the time considered by the controller for the analysis becomes “r28 x r29
: r02” in chiller mode, or “r28 x r30 : r04” in heat pump mode.
- Differential during the low load condition in chiller mode
r29: This parameter represents the new differential considered by the controller in chiller mode during
the low load condition.
Specifically, r02 is replaced by r29.
- Differential during the low load condition in heat pump mode
r30: This parameter represents the new differential considered by the controller in heat pump mode
during the low load condition.
Specifically, r04 is replaced by r30.
Fig. 5.b.m
Fig. 5.b.n
Key:
1. chiller;
2. chiller in low load;
3. heat pump;
4. heat pump in low load;
5. temperature.
- Heating compensation constant (mode Heat pump)
r31: Sets the coefficient that controls the heating compensation algorithm. In heating mode, if r31 is
positive, the set point decreases as the outside temperature decreases (measured by the outside probe);
if, on the other hand, r31 is negative, the set point increases as the outside temperature decreases.
This maximum deviation of the set point from the set value is equal to parameter r18. See, for example,
parameter r17.
• Firmware parameters: (F-r*)
These parameters cannot be set (display only:
H96-H97: software version of Driver 1, 2;
H98: software version of the expansion;
H99: software version of the µC
2
controller.

Carel µC2 Specifications

General

Brand	Carel
Model	µC2
Category	Controller
Language	English