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

3.14 EXTERNAL TEMPERATURE PROBE
(OPTIONAL).
The manifold is designed for the application of
the external probe (Fig. 3-19), which is available
as an optional kit. The probe can be connected
directly to the manifold P.C.B. or to the boiler
electrical system and allows the max. system
flow 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. The 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.
The 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. The
correlation between flow 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. The
correlation between flow 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).
3-19
Correction law of the flow temperature depending on the external temperature and user
adjustments of the central heating temperature.
POSITION OF THE TRIMMER
In brackets, temperature value with 25°/50° range
FT = Low-temperature zone Flow Temperature
ET = External temperature.
• No external temperature probe. To set the flow
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).
Trimmer Low-temperature
position zone flow
R12 or R13 (25 ÷ 50 °C)
1 25 °C
2 30°C
3 35°C
4 40°C
5 50 °C
Trimmer Low-temperature
position zone flow
R12 or R13 (35 ÷ 50 °C)
1 35°C
2 39 °C
3 43 °C
4 47 °C
5 50 °C
Low-temperature zone
ZONE P.C.B.
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).
High-temperature

3.15 TROUBLESHOOTING.

zone flow
- Presence of air in the system. Check the open-
(25 ÷ 75 °C)
ing of the boiler vents, the central heating
system and the DIM, act on the 3-way mixing
25 °C
valve, keeping it open for de-aeration (only for
37.5 °C
H-LT and H-2LT version). Make sure the sys-
tem pressure and expansion vessel factory-set
50 °C
pressure values are within the set limits; the
62.5 °C factory-set value for the expansion vessel must
be 1.0 bar, and system pressure between 1 and
75°C
1.2 bar.
- Low-temperature safety thermostat interven-
High-temperature
tion. It can depend on the blocked pump, the
zone flow
blocked mixing valve or an anomaly on the
(35 ÷ 75 °C)
P.C.B. Check the correct operation of the com-
ponents indicated above, making sure that the
35°C
anomalies signalled by flashing of the LEDS H9
45°C
or H10 (according to the cases) on the P.C.B.
disappear.
55 °C
- Low-temperature flow regulation NTC probe
65°C
anomaly. Replace the component and/or check
its correct operation, making sure that the
75°C
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
insufficient 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 flow temperature over that set
for the low-temperature zone (only for boilers
connected without IMG BUS).
- The table below identifies the errors displayed
on the boiler, when the manifolds are connect-
ed with the IMG BUS:
Code
3-20
32
33
34
35
36
46
29
Description
Zone 2 Low-Temperature probe
anomaly
Zone 3 Low-Temperature probe
anomaly
Low-temperature zone 2 safety ther-
mostat intervention
Low-temperature zone 3 safety ther-
mostat intervention
IMG BUS communication loss
DIM safety thermostat intervention
(optional)