35
ENG
Heos +0300078EN - rel. 1.6 - 23.11.2017
Serial connection
Below is the inverter water connection diagram. In this case, there is a
modulating controlled based not on the temperature inside the inverter,
but rather giving priority to the condensing pressure. For further control
(temperature inside the inverter), a minimum condensing temperature
threshold is set, below which the valve is progressively closed.
T
cond
0...10V
M
Fig. 6.aj
The modulating valve is selected in confi guration branch Bab06 for
condensing pressure control, the same for the control parameters. In
addition, screen Daa10 is used to set and enable this safety threshold so
that when the compressor is off , the valve is deactivated.
Note: The minimum inverter temperature with the compressor
running is around ten degrees lower than the value read, and
consequently the corresponding threshold should be set accordingly. In
addition, special care should be paid to the values set, when need to be
checked on the specifi c application. Otherwise, on low temperature
showcases, air-cooled inverters can be used.
Par. Description Def UoM
Min Max
coE Enable inverter anti-sweat
0= NO
1= YES
001
coc Inverter anti-sweat temperature threshold
15.0
(59.0)
°C
(°F)
0.0
(32.0)
50.0
(122.0)
cod Inverter anti-sweat temperature diff erential
3.0
(5.4)
°C
(°F)
0.0
(0.0)
10.0
(18.0)
6.14 “Dual temperature” management
This procedure provides “2 sets” (setA and setB) of parameters for
managing both a low temperature (setB) and medium temperature
cabinet (setA).
The set of parameters (setA or setB) can be selected either via the digital
input set on screen Bac20 or on the keypad via screen Df04; the function
is enabled and the type of selection (keypad/supervisor or digital input)
is set on screen Df03.
In the event of changes to the cabinet circuit, a digital output set on
screen Bad20 can be used; the active set used (A or B) for the digital
output is always selected on screen Df03.
The parameters (setA and setB) are programmed on screens Df05-13 for
setA and screens Df14-22 for setB; if the active set is “A”, then only the
parameters in setB will be visible; vice versa if the active set is “B” only the
parameters in setA will be visible. This is because if set “A” is active, the
corresponding operating settings are currently selected in the respective
control loops, while setB can be set on screens Df14-22; switching the
sets swaps the parameter settings.
The aff ected parameters are listed below:
"Dual
temp."
screen
Par. Description Std loop
screen
Df05/14 st User temperature set point Ca02
d0 Type of defrost/end defrost Dca01
dt1 End defrost temperature Dca02
dP1 Maximum defrost duration Dca02
Df06/15 dI Interval between two consecutive defrosts
0=disabled
Dca03
d2 Defrost control in pLAN Dca04
/10 Select probe used for end defrost (d0=4) Dca05
Df07…10/
16…19
td1…8 Defrost schedule day Dcb01…4
tt1…8 Defrost schedule hours Dcb01…4
tt1…8 Defrost schedule minutes Dcb01…4
Df11/20 d11 Temperature set point for running time Dcc02
d10 Defrost time for running time Dcc02
dA2 Delay at start-up to start Running time Dcc02
Df12/21 F1 Fan activation threshold Dd01
F3 Enable fans off during defrost 0 Dd02
Df13/22 AH High temperature alarm threshold Al.1 Fc01
AL Low temperature alarm threshold Al.1 Fc01
AH2 High temperature alarm threshold Al.2 Fc04
AL2 Low temperature alarm threshold Al.2 Fc04
PE2 Evaporator capacity Eb04
Tab. 6.ak
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