User manual

37
ENG
MPXPRO - + 0300055EN rel. 1.3 07/03/13
1. Heater defrost (d0 = 0, 2, 4): duty cycle
The duty cycle refers to the default values of parameters F2 and F3. The
valve can be opened to the initial value set for cP1 for a period equal to
Pdd.
t
Pdd
cP1
F3F2
OFF
SV/CMP
EEV
FAN
DEF
refrig refrigpump
down
drip
(dd)
post drip
(Fd)
res
ON
OFF
ON
OFF
ON
OFF
ON
Fig. 5.j
Key
t Time SV/CMP Solenoid / compressor
FAN Fan EEV Electronic expansion valve
DEF Defrost Pdd
Valve position maintenance time after
defrost
drip dripping post drip post dripping
2. Hot gas defrost (d0 = 1, 3): duty cycle
The duty cycle refers to the default values of parameters F2 and F3.
The valve can be opened to the initial value set for cP1 for a period equal
to Pdd.
Pdd
cP1
F3F2
OFF
SV/CMP
EEV
FAN
DEF
refrig refrigpump
down
drip
(dd)
post drip
(Fd)
hot gas
ON
OFF
ON
OFF
ON
OFF
ON
Fig. 5.k
Key
t Time SV/CP Solenoid / Compressor
FAN Fan EEV Electronic expansion valve
DEF Defrost Pdd
Valve position maintenance time after
defrost
drip dripping post drip post dripping
The pump down phase is the period in which the evaporator is emptied
of liquid refrigerant, and can be disabled by setting dH1=0. See the
chapter on Advanced functions. The operation of the fan during the
Pump down and Hot gas phases depends on parameters F2 and F3.
During the dripping and post-dripping phases, it is always off .
3. Multiplexed hot gas defrost (d0 = 5, 6) : duty cycle
The duty cycle refers to the default values of parameters F2 and F3.
The valve can be opened to the initial value set for cP1 for a period equal
to Pdd.
t
F2
dHGdHGdHGdHG
FAN
ESV
SSV
EEV
SV
HGSV
refrig refrigpump
down
drip
(dd)
post drip
(Fd)
hot gas
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Pdd
Fig. 5.l
Key
t Time SV Solenoid
FAN Fan EEV Electronic expansion valve
SSV Suction valve HGSV Hot gas valve
ESV Equalizing valve Pdd
Valve position maintenance time
after defrost
drip dripping post drip post dripping