M0G940E8-00 04/07/08 pag 21
7. CONTROL OF THE 3-WAY VALVE FOR SANITARY HOT WATER
8
1
CN2
121110987654321
gnd
CN1
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
35791113
2468101214
135791113
24681214
15
16
+5 V
Tx
Rx
DTR
GND
Sanitary hot water can be produced in summer and winter, based on
an external request, by controlling a dedicated 3-way valve.
When the contact is closed, the valve switches to the sanitary hot
water storage and the unit changes its working set point to the
sanitary hot water set point (par 117).
The passage from SANITARY HOT WATER mode to COOLING (or
vice versa) is timed and occurs only when the temperature of the
water has dropped below the safety limit defined by parameter 108.
Similarly, in the passage from SANITARY HOT WATER to
HEATING the switching occurs when the temperature of the water
has increased beyond the safety limit defined by parameter 109.
This function requires the optional plug-in expansion module that
must be assembled by the customer (refer to the instructions in the
kit ) and enabled with the parameter 140 = 1.
To enable the SANITARY HOT WATER management in summer as
well, par. 119 must be = 1
If the SANITARY HOT WATER set point is satisfied but the external
request remains active, the INCONGRUENT THERMOSTAT C36
shutdown is signalled: the sanitary hot water boiler thermostat
must be set to the same value as the sanitary hot water set point of
the machine.
If remote control will also be used for the SECOND SET POINT, it is
necessary to set par. 50 = 2. In this mode the inputs on the main
card will be configured as follows:
• CN1_10/11 sanitary hot water request
• CN1_14/16 second set point
Refer to the wiring diagram to identify the corresponding terminals
PLUG IN module
262524
23
22 302928
27
CN3
1357911
24
68
1012
par Description Meaning value
49 Comando2°Set Mode control 2° set point by parameter 0
50 EnH2OSanitaria Enabling sanitary water valve management 0
108 TlimiteCool H2O input value below which the compressor is enabled in cool mode 21
109 TLimiteHeat H2O input value above which the compressor is enabled in heat mode 25
117 SetH2OSanitaria Set Point sanitary water 35
119 ModeEnable Configure operation mode
140 PlugInEn Enables the PLUG-IN presence. 1=YES / 0=NO
With par. 50 = 1 the management becomes the following:
• CN1_10/11 unconfigured
• CN1_14/16 second set point / sanitary hot water
MODE
INPUT
2° set point on the
main board
VALVE POS. SET POINT 2° SET POINT
HEATING
ON to the installation set heat 2° set point heat *
SANITARY WATER OFF to the boiler SetH2OSanitary Not manageable
COOLING ON to the installation set cool second set point cool *
In this mode the 2nd set point (ECO) cannot be enabled by remote consent; it can be enabled from the LED keypad with
the ECO key or by setting parameter 49 = 1
SANITARY HOT WATER: COMPENSATION OF THE SET POINT FOR EXTERNAL TEMPERATURE
The set point can be compensated according to the external temperature in 2 modes:
1. hot season thermal efficiency curve
when the external temperature is high, the sanitary hot water set point is decreased; in this manner the thermal efficiency is
increased
curve A in the graph the compensation is enabled in the standard configuration
2. compressor operation limit
when the external temperature is particularly cold, the sanitary hot water set point is decreased in order to guarantee
operation of the compressor even near its operation limits curve B in the graph the compensation must be enabled during
start.
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