M02R40C8-00 29/07/08 page 20
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
7. COUPLING WITH BOILER
This function allows the unit to be coupled to a boiler with "high
temperature" thermostat setting (70 °C for example), i.e., with a
working point above the operating limits of the unit.
The coupling to the boiler is managed using:
• the external air temperature probe Text that disables the
unit and activates the boiler for external temperatures
less than the threshold set by parameter 88
• valves YV1 and YV2 that disconnect the unit from the
system when the water temperature of the system
detected by the probe Tout1 is above the operating limit
set by parameter 86
It is not possible to switch to the boiler in case of unit shutdown.
MAINTENANCE
With the unit coupled to a boiler the maintenance function, if
enabled, activates the boiler instead of the heat pump if
necessary.
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.
YV1
YV2
T
out1
Text
Par Description meaning Default U. m.
85 CaldaiaEn Enable Boiler+Heat Pump Function 0 float
86 SogliaMaxImp
Water temperature value above which the heat pump is disabled and the output
YV1 / 2 remains energized
55 °C
87 IsteresiSMI Hysteresis for heat pump activation and YV1 / 2 deactivation 2 °C
88 SogliaExt External temperature threshold below which the Boiler is enabled -5 °C
89 IsteresiExt External temperature hysteresis for heat pump activation 3 °C
70 Tout1En
Enable probe output
To Next Page
Loading...
