18
ENG
Heos +0300078EN - rel. 1.6 - 23.11.2017
6. FUNCTIONS
If the settings made using the wizard (commissioning) are not suffi ciently
detailed, the I/Os can be confi gured individually in branch B.a.xx
(inputs/outputs).
Note: many parameter codes, for uniformity, are the same as used
on the MPXpro controller (manual +0300055EN). In this case, the pGDE
shows a complete description of the parameters.
6.1 Probes (analogue inputs)
Heos features 10 universal analogue inputs (U1, U2, … U10) which can be
confi gured for the functions shown in the following table. The fi rst seven
(U1-U7) relate to the main probes and are confi gured by default; the other
three inputs are optional, and can be associated with other functions.
List of selectable functions
Par. Description
/FA Air outlet temperature (default U1)
/Fb Defrost temperature (default U2)
/Fc Air intake temperature (default U3)
/P3 Condensing pressure (default U7) (*)
/P4 Suction pressure (default U5) (*)
/P1 Discharge temperature (default U6) (*)
/P2 Suction temperature (default U4)
/Fq Liquid temperature
/FI Room temperature (SA)
/FL Room humidity (SU)
/FM Glass temperature
/FW Condenser water inlet temperature
/FY Condenser water outlet temperature
/FG Auxiliary probe 1
/FH Auxiliary probe 2
/FE Discharge temperature comp. 1
/FF Discharge temperature comp. 2
/FN Discharge temperature comp. 3
/FP Discharge temperature comp. 4
/Fr Discharge temperature comp. 5
(*) Slave units in a multi-evaporator system do not have their own compressor.
Consequently, the discharge pressure and temperature probes are not used.
These inputs can be connected to temperature, pressure and humidity
probes, as shown in the table below:
Temperature
NTC (-50T90°C; R/T 10 kΩ±1% @ 25°C)
NTC HT (0T150°C)
PT1000 (-100T400°C)
PT500 (-100T400°C)
PT100 (-100T200°C)
PTC (600Ω ...2200Ω)
Pressure
4-20mA
0-5V ratiometric
Humidity
4-20mA
0-1V
0-10V
Tab. 6.a
Active probes (voltage or current) can be powered directly by Heos (see the
chapter on connections). For all these probes, the range of measurement
needs to be confi gured on the corresponding screen.
Heos can modify the values read by the probes by applying a settable
off set directly in the screen used to associate the function to the input.
Serial probes cannot be calibrated, while probes that are shared with
the Master (such as the common pressure probe for multi-evaporator
systems) are calibrated on the Master. Only one pressure probe can be
shared across the Master/Slave network in multi-evaporator mode, and
must only be connected to the Master. Simply correctly confi gure the
probe in the corresponding screen and then on the Slaves, in the same
screen, select the “shared” probe option. In this way, the Slaves will
automatically look for the pressure value shared by the Master and use
this to calculate local superheat. This saves the cost of installing a pressure
probe on each evaporator, assuming that the pressure drop on of line in
the corresponding section is negligible.
The room temperature and humidity probes must not be positioned
too far from the corresponding showcases. At times it is better to install
more than one if the supermarket is divided into zones with diff erent
temperature and humidity (frozen foods, meat, fruit and vegetables, etc.):
glass temperature probe: NTC060WG00. The glass temperature probe
is connected at the coldest point of the glass on the showcase, so as
to optimise operation of the anti-sweat device (heaters or fans). See
instruction sheet +050002005.
Master/Slave system (see functional diagram for stand-alone
confi guration on page 3)
Up to 6 units can be connected together in a Master/Slave confi guration,
where the Master synchronises the defrosts and the night/day
transition for the entire group, and shares the suction pressure reading.
Communication between units in the same Master/Slave group is
managed over a pLAN sub-network connected to terminal J14 on each
controller.
Multi-evaporator system (see functional diagram for multi-evaporator
Master/Slave network on page 13)
In a Master/Slave system, just one compressor can be used, connected to
the Master, to serve the evaporators on the Slaves. This is called a multi-
evaporator system. One condensing unit can be connected to up to six
evaporators (including the Master). Each evaporating unit will be fi tted with
a controller, electronic expansion valve, air temperature probes, refrigerant
superheat temperature probe (evaporator outlet) and evaporator outlet
pressure probe. On the controllers, the cooling capacity of each unit needs
to be set (parameter PE2) and multi-evaporator mode must be activated on
both the Master and the Slaves (parameter PE1 > 1). On multi-evaporator
systems, the Master suction pressure probe reading can be shared and used
to calculate the superheat on the Slaves (confi gured by default).
6.2 Digital inputs
Heos manages four physical digital inputs, which can be selected as
shown below. There is also the possibility to use a virtual digital input,
propagated via pLAN from Master to Slaves. This is useful, for example,
for a curtain switch, as the units can switch from daytime to night-time
operation and vice-versa without needing additional wiring between the
Master and the Slaves. The virtual digital input can be set on the Master,
using parameter A9, and will be propagated to the Slaves by selecting
“Virtual DI”.
For example, if there is a Heos confi gured as Master and another as Slave,
DI1 on the Master will be connected to the door switch, and its status will
be shared with the Slave:
• on the Master, set parameter A9 to DI1;
• on the Slave, on the Door switch input confi guration screen, select
“Virtual DI”.
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