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6. ADDITIONAL HEATING ELEMENT
It is possible to control an external element for additional
heating, typically electric heaters.
The control can be:
•
ON-OFF ( max 1 A )
•
modulating WITH SIGNAL 0-10 V
(in this case a plug-in expansion module is necessary, an
optional that must be assembled by the customer (refer to the
instructions in the kit) and enabled with the parameter 140=1
The diagram on the side is indicative: check the position of the
water connections on the dimensional drawing of the unit or
on the adhesive labels on the unit itself.
The parameters 178 and 179 can be used to select the behaviour of the heaters:
P 178 P 179
AS AN ADDITIONAL ELEMENT ONLY
the heaters are considered as a second power step
1 0
IN REPLACEMENT OF THE COMPRESSOR
the heaters operate only when the compressor is disabled due to an external temp. lower than
par. 180
1 1
MAIN ADJUSTMENT UNIT IN HEATING MODE
in heat pump mode the compressor is disabled
2 1
POWER LIMITATION ACCORDING TO EXTERNAL TEMPERATURE
the following behaviour occurs as the external temperature decreases:
1st Zone = Compressor Enabled / Heaters Disabled
2nd Zone = Compressor Enabled / Heaters Enabled
3rd Zone = Compressor Disabled / Heaters Enabled
2 2
It is necessary to declare the presence of the outlet probe
Tout 1
with par. 70 = 1.
This probe becomes the reference for heat adjustment in heating mode; furthermore it manages the antifreeze protection
for this part of the system.
par Description
Meaning
value
70
Tout1En
Enables output probe
140 PlugInEn
Enables
PLUG-IN presence . 1=YES / 0=NO
177
PotRes
Power provided by the additional heaters
100
178
ModeHeater
Enable compressor operation in heating
0
179 LimPotTextEn Enable
capacity limit for ext. temperature
0
180
LimText
Ext. temperature limit for compressor operation
0
181
IstRes
Differential on LimText value for heaters activation
5
T out1
T ext
O - 10V
ON -OFF