Condenser Fan Control; Special Functions - Emerson Dixell XWi70K Installing And Operating Instructions

If the difference between the evaporator temperature and the room temperature is higher than the FCt
value, the controller will activate the fans. This function is disabled if FCt=0.
6.2 CYCLIC ACTIVATION OF THE FANS WHEN THE COMPRESSOR IS
SWITCHED OFF
When FnC=C-n or C-Y (fans in parallel to the compressor), the fans will be able to carry out on and off
cycles even if the compressor is switched off. The on and off interval of time follow the Fon and FoF
parameters. When the compressor is stopped, the fans will go on working for the Fon time. On the other
side, with Fon=0 the fans will stay always off when the compressor is off.
7

CONDENSER FAN CONTROL

The condenser fan control mode is selected by means of the FCC parameter:
FCC = C_n: fans will switch ON and OFF with the compressor and not run during defrost;
FCC = o_n: fans will run even if the compressor is off, and not run during defrost;
FCC = C_Y: fans will switch ON and OFF with the compressor and run during defrost;
FCC = o_Y: fans will run continuously also during defrost.
The par. FAC is used to select which temperature probe will be used from the condenser fan regulator.
This regulator uses a specific setpoint (par. St2) and differential (par. HY2) to activate and deactivate
the condenser fans:
If T>St2+HY2 the condenser fans are activated
-
- If T<St2 the condenser fans are deactivated.
The par. FCo can be used to keep the ventilators active for a period after compressor OFF.
8 AUXILIARY REGULATORS
Up to 2 auxiliary regulators can be used. Both can be linked:
To a digital output (relay) for ONOFF regulation
-
- To an analogue output for proportional regulation
The parameters used to configure the auxiliary regulators are the following:
ACH Type of action for auxiliary regulator
SAA Set point for auxiliary regulator
SHY Differential for auxiliary regulator
ArP Probe selection for auxiliary regulator
Sdd Auxiliary regulator disabled during any defrost
9

SPECIAL FUNCTIONS

By using the parameters oAx it is possible to configure the functions of the relay outputs as described
in the following paragraphs:
9.1 LIGHT RELAY (OAX = LIG)
By setting oAx=Lig the relay will work as light relay, it is switched on and off by the light button on the
keyboard and is affected by status of the digital input when i1F=dor.
The parameter LHt (Light timer) sets the time the light will stay on after pressing the light switch on the
keyboard. Every time the key is pushed the timer is re-loaded.
9.2 SECOND COMPRESSOR MANAGEMENT (OAX = CP2)
By setting one of the parameters oAx=CP2, the correspondent relay will operate as "second
compressor". It will be activated in parallel with the relay of the first compressor, with a possible delay
set in the AC1 parameter (seconds).
9.3 ON/OFF RELAY (OAX = ONF)
By setting one of the parameters oAx=onF, correspondent the relay will operate as "on-off" relay: it will
be activated when the controller is switched on and it will be switched off when the controller is in stand-
by status.
9.4 ALARM RELAY (OAX=ALR)
By setting oAx=ALr the correspondent relay will work as alarm relay, it is switched on when an alarm
happens.
Parameters involved:
- tbA (n, Y) Alarm relay silencing
- AoP (cL; oP) Alarm relay polarity
9.5 ANTI-SWEAT HEATER (OAX=TIM)
If oAx=tiM, the correspondent relay will be able to work as Anti-Sweat Heater output.
The relay will work based on the parameters btA (base time setting: seconds or minutes), AtF (output
OFF time) and Ato (output ON time) with the following logic: the relay output will cycle (starting with the
OFF time) between OFF and ON status.
9.6 ENERGY SAVING TIMEOUT
If the Energy Saving function has been activated by buttons or digital input, the Energy Saving will be
automatically deactivated once the time defined in the parameter ESt is expired. If the value of ESt=0
the timeout is not considered and the Energy Saving, once activated by button or digital input, can be
deactivated only manually by the user.
1592026640 XWi70K GB r1.0 04.06.2020
9.7 DEAD BAND (OAX=DB)
By setting oAx=db the controller will perform a
"dead band" regulation.
The heating element has to be connected to the
correspondent relay.
If the temperature increases and reaches set
point plus differential (HY) the compressor is
started and then turned off when the temperature
reaches the set point value again.
If the temperature decreases and reaches the set
point minus differential (HY) the output (heater)
is switched on and then turned OFF when the
temperature reaches again the set point.
10 KEYBOARDS
Depending on the type of keyboard, some special function could be linked to predefined buttons. Follow
here below the complete list of functions:
Normal pressure: to visualize the temperature set point; in programming mode it selects a
parameter or confirm an operation.
Timed: to modify the temperature set point; when max or min temperature value is displayed,
keep it pressed for 3 sec to reset the stored value.
Normal pressure: nu=not special functions; Std=maximum temperature; Lnt=configuration
change; ALr=alarm list
Timed: nu=not special functions; Std=maximum temperature; CC=reload default configuration;
ALr=not used; Pdn=Pull Down activation
Normal pressure: nu=not special functions; Std=minimum temperature; Lnt=configuration
change; ALr=alarm list
Timed: nu=not special functions; Std=maximum temperature; Lnt=configuration change; ALr=
not used; Pdn=Pull Down activation
Normal pressure: nu=not special functions; Pb2=Second probe value; AU1=auxiliary output 1
activation; AU2=auxiliary output 2 activation
Timed: nu=not special functions; Std=maximum temperature; Lnt=configuration change; ALr=
not used; Pdn=Pull Down activation
Normal pressure: nu=not special functions; LiG=light output activation; AU1=auxiliary output
1 activation; AU2=auxiliary output 2 activation; Lnt=configuration change
Timed: nu=not special functions; LiG=light output activation; AU1=auxiliary output 1 activation;
AU2=auxiliary output 2 activation; Lnt=configuration change; rSt=reset
Normal pressure: nu=not special functions; oFF=ON OFF function; ES=energy saving
Timed: nu=not special functions; oFF=ON OFF function; ES=energy saving
Normal pressure: nu=not special functions; AU1=auxiliary output 1 activation; AU2=auxiliary
output 2 activation; LiG=light output activation
Timed: nu=not special functions; AU1=auxiliary output 1 activation; AU2=auxiliary output 2
activation; LiG=light output activation
Normal pressure: nu=not special functions; ES=energy saving
Timed: nu=not special functions; ES=energy saving
10.1 KEYBOARD LOCK
It is possible to select partial or complete keyboard lock:
- brd: type of lock, UnL=unlock; SEL=only buttons SET and ONOFF are available during
lock condition (factory predefined configuration, not changeable); ALL=all buttons locked.
- tLC: power-on interval before locking keyboard
NOTE: a power-off is required to deactivate the keyboard lock function
10.2 CH620 OR VH620 KEYBOARD
10.3 T620T OR T620H KEYBOARD
XWi70K 2/8