Carel µC2SE User Manual

35
ON
1
OFF
A1 A1+A2
2
ENGLISH
µC
2
SE - +030220426 - rel. 2.0 - 03.08.2009
5. DESCRIPTION OF THE PARAMETERS
To modify the parameters, see chapter 4 “Parameters.”
• Probe settings: parameters (/*) ( see Table 4.a)
- Type of probe: from /01 to /08: enables the reading of the corresponding analogue input or sets the
function
• Functions of the probes
Type of unit Parameter H01 Temp. control
probe
1
st
circuit
Antifreeze probe
1
st
circuit
Cond. temp.
probe
Press probe
1
st
circuit
2
nd
evaporator
Antifreeze
probe
2
nd
circuit
Cond. temp.
probe
Press. probe
2
nd
circuit
0= air/air B1 B2 ( low outlet
temperature)
B3 B4 Not used B7 B8
1= air/air heat pump (cooling/heating) B1 B2 ( low outlet
temperature)
B3 B4 Not used B7 B8
2= air/water Chiller B1/B2 single circuit
(B1/B5 two circuits)
B2 B3 B4 B6 B7 B8
3= air/water heat pump (cooling/heating) B1/B2 single circuit
(B1/B5 two circuits)
B2 B3 B4 B6 B7 B8
4= water/water Chiller B1/B2 single circuit
(B1/B5 two circuits)
B2 Not used Not used B6 Not used Not used
5= water/water heat pump rev. on gas cooling B1/B2 single circuit
(B1/B5 two circuits)
B2 B3 B4 B6 B7 B8
heating B1/B2 single circuit
(B1/B5 two circuits)
B3 B3 B4 B7 B7 B8
6= water/water heat pump rev. on H
2
O cooling B1/B2 single circuit
(B1/B5 two circuits)
B2 Not used B4 B6 Not used B8
heating B3 B2 Not used B4 B6 Not used B8
7= Air-cooled condensing unit - - B3 B4 - B7 B8
8= Air-cooled condensing unit rev. on gas - - B3 B4 - B7 B8
9= Water-cooled condensing unit
- - B3 B4 - B7 B8
10= Water-cooled condensing unit rev. on gas
-B3B3B4B7B7B8
11= Cooling-only air-air unit with electric heating
B1 B2 (low outlet
temperature)
B3 B4 Not used B7 B8
Table 5.a
- Min/max voltage and pressure values
From /09 to /12: sets the minimum/maximum voltage and pressure for the ratiometric signal.
- Probe calibration
From /13 to /20: calibrates the corresponding sensor (from B1 to B8).
- Digital fi lter
/21: Establishes the coeffi cient used in the digital fi ltering of the value measured. High values for this
parameter will eliminate any continuous disturbance at the analogue inputs (however decrease the
promptness of measurement). The recommended value is 4 (default).
- Input limit
/22: Establishes the maximum variation that can be measured by the probes in one unit program cycle;
in practice, the maximum variations allowed in the measurement are between 0. 1 and 1.5 units (bars, °C
or °F, depending on the probe and the unit of measure) approximately every one second. Low values for
this parameter will limit the effect of impulsive disturbance. Recommended value 8 (default).
- Unit of measure
/23: Selects the unit of measure as degrees centigrade or Fahrenheit. When the parameter is modifi ed,
the µC
2
SE automatically converts the values read by the NTC temperature probes B1, B2, B3 into the new
unit of measure; while all the other parameters set (set point, differential etc. ) remain unchanged.
• Antifreeze, auxiliary heater: parameters (A*)
- Antifreeze alarm set point/outlet limit (low ambient temp. for air/air units)
A01: when probe B2 is installed on the coil represents the temperature (antifreeze set point) of the water
at the evaporator outlet below which an antifreeze alarm is activated; in this condition the compressors
corresponding to the
circuit in question are stopped, while the pump remains on to decrease the possibility of freezing. The
alarm is reset manually (or automatically, depending on parameter P05) only when the water temperature
returns within the operating limits (that is, above A01+A02).
In the Air/Air units (H1=0,1) the value represents the low room temperature warning threshold; this
alarm, activated according to value read by probe B1 or B2 (depending on parameter A06) is signal only,
and is reset depending on the value of P05.
If probe B2 is placed in the outlet air fl ow (air/air units), A01 becomes the outlet limit, and if the outlet
probe reading (B2) < outlet limit (A1) then:
bypass waiting time A3; 1.
stop the compressors; if already off go to pt. 4; 2.
bypass waiting time A3;3.
close damper with 50% duty cycle if FC active and the ambient temperature means damper open or 4.
dead zone. If FC is not active go to pt. 6;
bypass waiting time A3 after having closed r28 twice (from the end of the last period);5.
If B2 < A1 the alarm “A1” is activated. The alarm reset depends on P5.6.
Example of antifreeze/outlet limit management
Fig. 5.a.a
Key:
1. freecooling or comp 2. probe B2

Carel µC2SE Specifications

General

Brand	Carel
Model	µC2SE
Category	Controller
Language	English