xxxxxxxxxxxxxxxxxx XR44CH ISA GB r1.6 21.11.2016
XR44CH
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7.5.2 HOW TO: MOVE A PARAMETER FROM THE HIDDEN MENU TO THE
FIRST LEVEL AND VICEVERSA.
Each parameter present in the hidden menu (Pr2) can be moved into the user level (Pr1) by pressing
SET+DOWN buttons. If a parameter is part of the user level, when showed in the hidden menu the
decimal point will be lit.
7.6
HOW TO: LOCK THE KEYBOARD
1.
Keep both UP and DOWN buttons pressed for more than 3 sec.
2.
The “PoF” message will be displayed and the keyboard will be locked. At this point it will be
possible only to see the set point or the MAX o Min temperature stored
3.
If a button is pressed more than 3 sec the “PoF” message will be displayed
7.7
HOW TO: UNLOCK THE KEYBOARD
Keep pressed together for more than 3 sec the UP
and DOWN keys till the “Pon” message will be
displayed.
7.8
THE CONTINUOUS CYCLE
When defrost is not in progress, it can be activated by holding the UP key pressed for about 3 sec.
The compressor operates to maintain the CCS set point for the time set through the CCt parameter.
The cycle can be terminated before the end of the set time using the same activation key UP for 3 sec.
7.9
THE ON/OFF FUNCTION
With “onF = oFF”, pushing the ON/OFF key, the instrument is switched off. The “OFF”
message is displayed. In this configuration, the regulation is disabled.
To switch the instrument on, push again the ON/OFF key.
WARNING: Loads connected to the normally closed contacts of the relays are always supplied
and under voltage, even if the instrument is in stand by mode.
7.10
SECOND DIGITAL INPUT OR PROBE 4.
The input normally used as fourth probe can be used as second digital input according to the setting of
the parameter P4C.
With P4C = Pb the input works as probe.
With P4C = i2F the input works as second digital input (par. i2F)
8.
PARAMETERS
REGULATION
HY
Differential: (0.1 to 25.5°C; 1 to 45°F) intervention differential for set point. Compressor
Cut IN is Set Point + differential (HY). Compressor Cut OUT is when the temperature
reaches the set point.
LS
Minimum set point: (-100°C to SET; -148°F to SET) sets the minimum value for the
set point.
US
Maximum set point: (SET to 150°C; SET to 302°F) set the maximum value for set
point.
ot
Thermostat probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible
offset of the thermostat probe.
P2P
First evaporator probe presence: (n; Y) n = not present, the defrost stops by time;
Y = present, the defrost stops by temperature.
oE
First evaporator probe calibration: (-12.0 to 12.0°C; -21 to 21°F) allows to adjust
possible offset of the evaporator probe.
P3P
Second evaporator probe presence (P3): (n; Y) n = not present, the terminals operate
as digital input; Y = present, the terminals operate as third probe.
o3
Second evaporator probe calibration (P3): (-12.0 to 12.0°C; -21 to 21°F) allows to
adjust possible offset of the third probe.
P4P
Fourth probe presence (P4): (n; Y) n = not present, Y = present
O4
Fourth probe calibration (P4): (-12.0 to 12.0°C; -21 to 21°F) allows to adjust possible
offset of the fourth probe.
P4C
Probe 4 setting (Pb = temperature probe: id4 = second digital input)
odS
Outputs activation delay at start up: (0 to 255min) this function is enabled at the initial
start up of the instrument and inhibits any output activation for the period of time set in
the parameter.
AC
Anti-short cycle delay for first compressor: (0 to 50 min) minimum interval between
the compressor stop and the following restart.
AC1 Anti-short cycle delay for second compressor: (0 to 50 min) minimum interval
between the compressor stop and the following restart.
Mon
Maximum time single compressor on : (0÷255min; with 0 function not enabled).
When Mon is expired the second compressor is activated.
2CC
Dual compressor management: SEq = sequence – HAF= Dual band
rtr
Percentage of the third and first probe for regulation (0÷100; 100 = P1, 0 = P3 ): it
allows to set the regulation according to the percentage of the first and third probe, as
for the following formula (rtr(P1-P3)/100 + P3)
CCt
Compressor ON time during continuous cycle: (0.0 to 24h00min, res. 10 min) allows
to set the length of the continuous cycle. Compressor stays on without interruption
during CCt time. This is useful, for instance, when the room is filled with new products.
CCS
Set point for continuous cycle: (-55 to 150°C; -67 to 302°F) it sets the set point used
during the continuous cycle.
Con
Compressor ON time with faulty probe: (0 to 255min) time during which the
compressor is active in case of faulty thermostat probe. With Con=0 compressor is
always OFF.
CoF
Compressor OFF time with faulty probe: (0 to 255min) time during which the
compressor is OFF in case of faulty thermostat probe. With CoF=0 compressor is
always active.
DISPLAY
CF
Temperature measurement unit: (°C; °F) °C = Celsius; °F = Fahrenheit.
WARNING: When the measurement unit is changed the SET point and the values of the
parameters HY, LS, US, ot, ALU and ALL have to be checked and modified (if
necessary).
rES
Resolution (for °C): (in=1°C; dE=0.1°C) allows decimal point display.
Lod
Instrument display: (P1; P2, P3, P4, SET, dtr) it selects which probe is displayed by the
instrument. P1 = Thermostat probe; P2 = Evaporator probe; P3 = Third probe (only for
model with this option enabled); P4 = Fourth probe, SET = set point; dtr = percentage of
visualization.
rEd
X- REP display (optional): (P1; P2, P3, P4, SET, dtr): it selects which probe is
displayed by X- REP: P1 = Thermostat probe; P2 = Evaporator probe; P3 = Third
probe(only for model with this option enabled); P4 = Fourth probe, SET = set point; dtr =
percentage of visualization.
dLy
Display delay: (0 ÷20.0m; risul. 10s) when the temperature increases, the display is
updated of 1 °C/1°F after this time.
dtr
Percentage of the third and first probe for visualization when Lod = dtr (0÷100; 100
= P1, 0 = P3 ): if Lod = dtr it allows to set the visualization according to the percentage
of the first and third probe, as for the following formula (dtr(P1-P3)/100 + P3).
DEFROST
tdF
Defrost type: (EL; in) EL = electrical heater; in = hot gas.
dFP
Probe selection for first defrost termination: (nP; P1; P2; P3; P4) nP = no probe;
P1 =thermostat probe; P2 = second probe; P3 =configurable probe; P4 = Fourth probe.
dSP
Probe selection for second defrost termination: (nP; P1; P2; P3; P4) nP = no probe;
P1 =thermostat probe; P2 = second probe; P3 =configurable probe; P4 = Fourth probe.
dtE
First defrost termination temperature: (-55 to 50°C; -67 to 122°F) (enabled only when
EdF=Pb) sets the temperature measured by the evaporator probe, which causes the end
of defrost.
dtS
Second defrost termination temperature: (-55 to 50°C; -67 to 122°F) (enabled only
when EdF=Pb) sets the temperature measured by the evaporator probe, which causes
the end of defrost.
idF
Interval between defrost cycles: (0 to 120 hours) determines the interval of time
between two defrost cycles.
MdF
(Maximum) length for first defrost: (0 to 255 min) when P2P=n, (not evaporator probe:
timed defrost) it sets the defrost duration. When P2P=Y (defrost end based on
temperature) it sets the maximum length for defrost.
MdS
(Maximum) length for second defrost: (0 to 255 min) when P2P=n, (not evaporator
probe: timed defrost) it sets the defrost duration. When P2P=Y (defrost end based on
temperature) it sets the maximum length for defrost.
dSd
Start defrost delay: (0 to 99 min) this is useful when different defrost start times are
necessary to avoid overloading the plant.
StC
Compressor stop before defrost: (da 0 a 30 min) with hot gas defrost it sets
compressor stop vefore defrost.
dFd
Temperature displayed during defrost: (rt; it; SEt; dEF) rt = real temperature;
it = temperature at defrost start; SEt = set point; dEF = “dEF” label.
dAd
MAX display delay after defrost: (0 to 255 min) sets the maximum time between the
end of defrost and the restarting of the real room temperature display.
Fdt
Drip time: (0 to 120 min) time interval between reaching defrost termination temperature
and the restoring of the control’s normal operation. This time allows the evaporator to
eliminate water drops that might have formed due to defrost.
dPo
First defrost after start-up: (n; Y) n = after the idF time, Y = immediately.
Hd1
Pre-defrost cycle differential (-12.0÷12.0°C/-24÷24°F)
Ht1
Pre-defrost cycle duration (0÷120min)
Hd2
Post-defrost cycle differential (-12.0÷12.0°C/-24÷24°F)
Ht2
Post-defrost cycle duration (0÷120min)
dAF
Defrost delay after continuous cycle: (0.0 to 24h00min, res. 10min) time interval
between the end of the fast freezing cycle and the following defrost related to it.
FANS
FnC
Fans operating mode: (C-n; o-n; C-Y; o-Y) C-n = runs with the compressor, OFF during
defrost; o-n = continuous mode, OFF during defrost; C-Y = runs with the compressor,
ON during defrost; o-Y = continuous mode, ON during defrost.
Fnd
Fans delay after defrost: (0 to 255min) interval between end of defrost and evaporator
fans start.
FCt
Temperature differential to avoid fan short cycles: (0 to 59°C; 0 to 90°F) (N.B.: if
FCt=0 function disabled) if the difference of temperature between the evaporator and the
room probes is higher than FCt value, the fans will be switched on.
FSt
Fans stop temperature: (-55 to 50°C; -67 to 122°F) setting of temperature, detected by
evaporator probe, above which fans are always OFF.
Fon
Fan ON time: (0÷15 min) with Fnc = C_n or C_y, (fan activated in parallel with
compressor). it sets the evaporator fan ON cycling time when the compressor is off.
With Fon =0 and FoF ≠ 0 the fan are always off, with Fon=0 and FoF =0 the fan are
always off.
FoF
Fan OFF time: (0÷15 min) with Fnc = C_n or C_y, (fan activated in parallel with
compressor). it sets the evaporator fan off cycling time when the compressor is off. With
Fon =0 and FoF ≠ 0 the fan are always off, with Fon=0 and FoF =0 the fan are always
off.
FSU
Kind of action of fan:
Std = standard, according to the Fnc parameter
Fon = with i1F = FAn and Fnc = Cn or C-y, by means of digital input the fan works
according to the Fnc parameter or are always on.
FoF = with i1F = FAn by means of digital input the fan are enabled or switched off.
ALARMS
ALU
MAXIMUM temperature alarm:
If ALC=Ab: [ALL to 150.0°C or ALL to 302°F]
If ALC=rE: [0.0 to 50.0°C or 0 to 90°F]
when this temperature is reached the alarm is enabled, after the ALd delay time.
ALL
Minimum temperature alarm:
If ALC=Ab: [-100°C to ALU; -148 to ALU]
If ALC=rE: [0.0 to 50.0°C or 0 to 90°F]
when this temperature is reached the alarm is enabled, after the ALd delay time.
AFH
Differential for temperature alarm recovery: (0.1 to 25.5°C; 1 to 45°F) intervention
differential for recovery of temperature alarm.
ALd Temperature alarm delay: (0 to 255 min) time interval between the detection of an
alarm condition and alarm signalling.
