M0G940E8-00 04/07/08
pag
20
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
T out1
T ext
O - 10V
ON -OFF
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
Summary of Contents for WSAN-XPR 21
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