Immergas DIM 2 ZONE ERP - External Temperature Probe (Optional); Troubleshooting

29
3-19
45
31
58
3-20
INSTALLERUSER
MAINTENANCE TECHNICIAN
3.14 EXTERNAL TEMPERATURE PROBE
OPTIONAL.
e manifold is designed for the application of
the external probe (Fig. 3-19), which is available
as an optional kit. e probe can be connected
directly to the manifold P.C.B. or to the boiler
electrical system and allows the max. system
ow temperature to be automatically decreased
when the external temperature increases, in
order to adjust the heat supplied to the system
according to the change in external tempera-
ture. e external probe always operates when
connected, regardless of the presence or type of
room chrono-thermostat used, and can work in
combination with Immergas timer thermostats.
e external probe must be electrically connected
as indicated in the Fig. 3-5, 3-6, 3-11, 3-12, 3-13,
3-14 or 3-16.
• Control of the High-Temperature zone. e
correlation between ow temperature to the
system and external temperature is determined
by the parameters set on the boiler. See boiler
instructions manual.
• Control of the Low-Temperature zone. e
correlation between ow temperature to the
system and external temperature is determined
by the position of the trimmer (15 or 16 Fig.
3-18) on the zone board according to the curve
represented in the diagram (Fig. 3-20).
• No external temperature probe. To set the ow
temperature of the low-temperature zones, it
is necessary to act using a screwdriver on the
trimmer (R12 or R13) present on the zone
control unit following the table provided below
(15 or 16 Fig. 3-18).
Low-temperature zone
Correction law of the ow temperature depending on the external temperature and user
adjustments of the central heating temperature.
FT = Low-temperature zone Flow Temperature
ET = External temperature.
Trimmer
position
R12 or R13
Low-temperature
zone ow
(25 ÷ 50 °C)
High-temperature
zone ow
(25 ÷ 75 °C)
1 25 °C 25 °C
2 30°C 37.5 °C
3 35°C 50 °C
4 40°C 62.5 °C
5 50 °C 75°C
Trimmer
position
R12 or R13
Low-temperature
zone ow
(35 ÷ 50 °C)
High-temperature
zone ow
(35 ÷ 75 °C)
1 35°C 35°C
2 39 °C 45°C
3 43 °C 55 °C
4 47 °C 65°C
5 50 °C 75°C
Note: using an IMG BUS connection to the
Superior kW boiler, the low-temperature zones
are regulated on the boiler display.
Note: when the external probe is connected, the
OFFSET action can be regulated (with Superior
kW boilers only).
3.15 TROUBLESHOOTING.
- Presence of air in the system. Check the open-
ing of the boiler vents, the central heating
system and the DIM, act on the 3-way mixing
valve, keeping it open for de-aeration (only for
H-LT and H-2LT version). Make sure the sys-
tem pressure and expansion vessel factory-set
pressure values are within the set limits; the
factory-set value for the expansion vessel must
be 1.0 bar, and system pressure between 1 and
1.2 bar.
- Low-temperature safety thermostat interven-
tion. It can depend on the blocked pump, the
blocked mixing valve or an anomaly on the
P.C.B. Check the correct operation of the com-
ponents indicated above, making sure that the
anomalies signalled by ashing of the LEDS H9
or H10 (according to the cases) on the P.C.B.
disappear.
- Low-temperature ow regulation NTC probe
anomaly. Replace the component and/or check
its correct operation, making sure that the
anomaly signalled via switch-on of the LEDS
H9 or H10 (according to the cases) on the
P.C.B. disappears.
- Low-temperature zone flow temperature
insucient or too low. It can depend on an
incorrect regulation of the trimmer (R12 or
R13) present on the P.C.B. from the blocked
or broken mixing valve (only for H-LT and
H-2LT version), or on the temperature set on
the lower boiler with respect to that requested
in the low-temperature circuit (only for boil-
ers connected without IMG BUS). Check the
correct regulation of the trimmer, check the
correct operation of the mixing valve (only for
H-LT and H-2LT versions). Make the boiler
function with a ow temperature over that set
for the low-temperature zone (only for boilers
connected without IMG BUS).
- e table below identies the errors displayed
on the boiler, when the manifolds are connect-
ed with the IMG BUS:
Code Description
32
Zone 2 Low-Temperature probe
anomaly
33
Zone 3 Low-Temperature probe
anomaly
34
Low-temperature zone 2 safety ther-
mostat intervention
35
Low-temperature zone 3 safety ther-
mostat intervention
36 IMG BUS communication loss
46
DIM safety thermostat intervention
(optional)
POSITION OF THE TRIMMER
ZONE P.C.B.
In brackets, temperature value with 25°/50° range