Drain Heater Management; Temperature Pull Down - Carel ir33+FMC Guía Rápida

ENG
3.5

Drain heater management

The AUX relay is configured as drain heater relay by H1 = 14.
With the defrost request, the Fullmotion compressor changes speed to cdf.
The defrost relay is delayed for the time dH1.
At the end of the defrost, the Fullmotion compressor changes to normal control and the drain heater is still
pending for the time dH2, Drain postheat.
The following diagram describes a hot gas defrost with drain heater management.
Status
Defrost
signal
Comp.
Capacity
Defrost Valve
Relay
Drain heater
AUX
H1 = 14 –› AUX = Drain
NB:
Evaporator fan management is based on the parameters F0/F1/F2/F3.
During the dripping time dd and the drain postheat time Fd, the fan remains OFF.
See the section on Fan management.
Cod. Parameter
cdf Compressor frequency for hot gas defrost
dH1 Defrost valve delay
dH2 Drain post heat
dd Dripping time after defrost (fans off )
H1 Configure function of output AUX1
5 = pump down valve
7 = delayed compressor (see c11)
11 = reverse with neutral zone
12 = second compressor
13 = no function
14 = drain heater management
3.6

Temperature Pull Down

The controller performs an automatic temperature Pull Down procedure every time the refrigeration unit
temperature rises above the high temperature threshold AH.
The Pull Down procedure ends when the refrigeration unit temperature reaches the set point St.
The maximum Pull Down time is selected by parameter cPd.
ir33+ wide Fullmotion - +040000055 - rel. 1.0 - 09.06.2014
Drain Heat
End of Defrost by temperature or time
Comp. Capacity during defrost settable by:
Comp. OFF with Heater Management
Drain preheater
dH1
Drip o
Hold
Drip o
time
cdF
Drain postheater dH2
Fig. 3.d
UOM Dis.
Hz C
sec C
sec C
min C
- C
12
Pull down
only if T > AH & cPd >1
max Pull Down
frequency x at
150 Hz
Type Def. Max
I 140 255
I 180 999
I 180 999
A 2 15
I 14 14
Min
0
0
0
0
0
Tab. 3.e