Commissioning The Device; Circulation Pump; Sizing The Systems; Kits Available On Request - Immergas DIM 2 ZONE ERP Instructions And Warnings

1.7 COMMISSIONING THE DEVICE.

System filling. Once the device is connected, fill
the system via the boiler filling valve.
Filling is performed at low speed to ensure the
release of air bubbles in the water via the boiler
and central heating system vents and the distri-
bution manifold (if any).
Close radiator vent valves when only water
escapes from them.
Close the filling cock when the boiler pressure
gauge indicates approx. 1.2 bar.
IMPORTANT: during these operations, start
the circulation pumps by acting on the main
switch positioned on the boiler control panel
after having activated the T.A. devices relating
to the various zones.
(Only for DIM H-LT and H-2LT).
Act manually on the 3-way mixing vale using the
relevant lever on the electric actuator, keeping the
same opening in order to de-aerate the system
and, if necessary, control the correct operating
pressure.
Once these operations are complete, make sure
that the lever on the electric actuator is free from
the manual lock position.

1.8 CIRCULATION PUMP.

The pump is ideal for the requirements of each
central heating system in a domestic and residen-
tial environment. In fact, the pump is equipped
with electronic control that allows you to set
advanced functions.
Adjustments. Turn the selector and position it on
the desired curve to adjust the circulator pump.
Program
P 1 lower (ΔP-V)
P 2 upper (ΔP-V)
C 3 lower (ΔP-C) - H=3 m
C 4 upper (ΔP-C) - H=4 m
Min. - Max.
Circulating pump
Description
LED
LED steady on
Flashing white LED Noises during cir-
culation of the heat
LED steady on
transfer fluid
LED off
The circulator does
Red LED
- Program P (1 lower 2 upper ) (ΔP-V) - Pro-
portional curve (green LED). This allows
the pressure level (head) to be proportionally
reduced as the system heat demand decreases
(flow rate reduction). Thanks to this function,
the electric power consumption of the cir-
culator pump is reduced further: the energy
(power) used by the pump decreases accord-
ing to the pressure level and flow rate. With
this setting, the pump guarantees optimal
performance in most heating systems, thereby
being particularly suitable in single-pipe and
two-pipe installations. Any noise originating
from the water flow in the pipes, valves and
radiators is eliminated by reducing the head.
Optimal conditions for thermal comfort and
acoustic well-being.
- Programs C (3 lower 4 upper ) (ΔP-C) -
Constant curve (orange LED). The circulator
pump maintains the pressure level (head)
constant as the system heat demand decreases
(flow rate reduction). With these settings, the
circulator pump is suitable for all floor systems
where all the circuits must be balanced for the
same drop in head.
- MIN. - MAX. program (blue LED). The pump
is distinguished by adjustable operating curves
by positioning the selector in any point between
the Min. and Max. positions, thereby satisfying
any installation requirement (from a simple
single-pipe to more modern and sophisticated
systems) and always guaranteeing optimum
performance. The precise working point can be
selected in the entire field of use by gradually
adjusting the speed.
Real-time diagnostics: a lit LED (in various
LED
colours) provides information regarding the
pump operating status, see fig. 1-7
green
Possible pump release. The pump block is
indicated by a fixed red LED switching on. Turn
orange
the selector up to the MAX. position, disconnect
and reconnect the power to restart the automatic
blue
release process. The pump will then activate the
procedure, which will last for a maximum of
15 minutes and the LED will flash upon each
restart. It then turns blue for a few seconds and
goes back to red if the attempt to restart is not
successful. Once the process is complete, position
the selector back on the desired curve and if the
problem has not been resolved, perform the
manual release procedure as described below.
- Disconnect the power to the boiler (the LED
switches off).
- Close the system flow and return and allow the
Insufficient system pressure, circulating pump
Pump
in cavitation
noisy
Presence of foreign matter in the impeller
Presence of air in the system
Flow rate too high
Power outage
Faulty circulating pump
not work
Rotor seized
Insufficient power supply voltage
Diagnostics
Restore correct thermal circuit pressure
Remove the motor and clean the impeller
Vent the system
Reduce rotation speed
Ensure the boiler is correctly powered, ensure
the circulator is correctly powered
Replace the circulating pump
Remove the motor and clean the impeller
Check boiler power supply voltage
10
pump to cool down.
- Empty the system circuit via the relative cock.
- Remove the motor and clean the impeller.
- Once unblocked, remount the motor.
- Fill the primary circuit; restore boiler power
and set the desired curve.
Attention: a scalding hazard is present due to
high fluid temperatures and pressures. Scalding
hazard as a result of contact.

1.9 SIZING THE SYSTEMS.

The flow temperatures to the various system
zones may be reduced with respect to the boiler
outlet temperatures, according to the mixture
of the flow and return fluids inside the DIM. In
the event that the DIM is used to feed Low-Tem-
perature zones, check that the design parameters
allow you to achieve a maximum surface tem-
perature of the radiant floor in compliance with
standard UNI EN 1264.

1.10 KITS AVAILABLE ON REQUEST.

• System cut-off cock kit (on request). The man-
ifold is designed for the installation of system
interception cocks, to be placed on the flow
and return pipes of the connection assembly.
This kit is particularly useful for maintenance
as it allows the DIM to be drained separately
without having to empty the entire system.
• External probe kit.
• Safety thermostat kit.
• By pass kit for H-LT and H-2LT. versions.
The above-mentioned kits are supplied complete
with instructions for assembly and use.
Remedy
1-7