M03Q40G6-03 30/07/08
pag
25
8.
DUAL CONTROLS FOR TEMPERATURE – RADIANT PANELS
It is necessary the expansion
plug-in module
that must be fitted by the client (r refer to the kit instructions) and enabled by
parameter 140 = 1.
With the optional kit, the mixed elements can be controlled: fan coils + radiant panels:
•
Radiant panel circulator
•
Mixing valve (0-10 volt or ON-OFF)
•
Delivery probe (NTC type, 10 Kohm at 25°C)
•
External control: COOLING/HEATING LIMIT (avoids dew / overheating).
ATTENTION: to prevent dew in summer or superheating in winter, it is very important to fit an external device and
interface it with the unit that in case of signalling will force the recycling valve on the radiant panels
BLEEDING BY CHILLER
RADIANTS IN RECYCLING
8
7°
12°
18°
23°
8
7°
12°
18°
23°
Output status on the optional plug-in module
valv 0-10
10 volt
valv 0-10
0 volt
out 22-23 =
ON
out 22-23 = OFF
3-point valve
out 22-25 = OFF
3-point
valve
out 22-25 =
ON
The water set point at the radiant panels can be managed in three ways:
1. the valve is managed to maintain the outlet temperature at par 192 value, independently of the unit operating mode
(COOLING or HEATING).
2. calculated automatically in function of the external air temperature; two set are calculated (HEAT. / COOL.) that become
actives on the basis of the unit operating mode. This configuration is obtained setting par 190=1
COOLING
HEATING *
P 197
P 196
SET POINT
T EXT
P 195
P 194
T EXT
P 201
P 200
SET POINT
P 199
P 198
3. the installation maintains the summer set point at a value higher than the critical one, to avoid the dew formation on the
floor. The unit can be connected via MODBUS to an external device (for example ELFOCONTROL) that transmits the
temperature values and the ambient humidity. This configuration is obtained setting par 191 = 1.
If the unit is at service of an installation only for radiant panels (without mixing valve and fan coil) modify the following pump
configuration parameters:
par Description
Original
value
Correct value
183 MaxTempC
12
8
184 MinTempH
12
8
185 IstTempC
4
2
186 IstTempH
4
2
only WSHH
