M03Q40G6-03 30/07/08
pag
22
6.
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
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
* only WSHH
