M0G940E8-00 04/07/08
pag
21
7.
CONTROL OF THE 3-WAY VALVE FOR SANITARY HOT WATER
8
1
CN2
12
11
10
9
8
7
6
5
4
3
2
1
gnd
CN1
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
3
5
7
9
11
13
2
4
6
8
10
12
14
1
3
5
7
9
11
13
2
4
6
8
12
14
15
16
+5 V Tx Rx DT
R
GN
D
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
26
25
24
23
22
30
29
28
27
CN3
1
3
5
7
9
11
2
4
6
8
10
12
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.
Summary of Contents for WSAN-XPR 21
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