ELECTRICAL - ELECTRONIC OPTIONS
7558
25
Generic pulse input acquisition
The CONTECA
®
EASY module can acquire
up to two additional
pulse inputs
(for one additional pulse a product code 755825 must
be ordered; for two additional pulses 2 x product code 755825 are
required), in addition to those already dedicated to DHW and DCW.
Sometimes, and normally when there is a controller code 755010,
it is interesting to use the bus to transfer the user data in terms of
consumption (gas meter / electricity meter).
The generic pulse must
have no potential (voltage-free contact,
maximum frequency 1 Hz
). Class IB. Residences and hotels are
particularly suitable types of consumers.
7558
10
Cooling units metering
Upon activation of the software module, CONTECA
®
EASY is able to
meter the heating and cooling units, on the evaluation of the
temperature difference reversal, in separate registers for
both
the current values and for the logged files.
7558
8.
Pulse output
The pulse output enables transferral of the heating and/or cooling
energy values to a generic logger.
The pulse weighs 1 kWh
.
The pulse output with no potential is
open collector
with pulse time
120 ms - Vmax 24 V (dc) - 50 mA.
7558
90
Remote energy totaliser
Electronic 8-digit LCD totaliser equipped with cover plate for
three-
slot recessed electric box
.
Lithium battery: life 8 years - max frequency 20 Hz
Suitable for pulse outputs code 75588.
Shielded cable length (2x1 mm
2
): max 75 m.
7558
81
7558
82
Single pulse output - HEATING UNITS
Double pulse output - HEATING/COOLING UNITS
Code
RS485
EASY
CO
N
TECA
EASY
RS485
EASY
CO
N
TECA
EASY
7507 . .
755882
755881
Acquisition board
Terminals 2 - 3 Heating units
7507 . .
Terminals 2 - 3 Heating units
Terminals 1 - 2 Cooling units
CALEFFI
ENERGY kWh
2
6
0 V
HEATING UNITS output
COOLING UNITS output
GND
12
34
56
78
91
01
11
21
31
41
51
61
71
8
Option code 755826 is supplied with an AUTOFLOW
®
with a
1/2” connection and a nominal flow rate of 40 l/h, code 127141
M04
7558
26
Flow rate - DHW recirculation scan
In compliance with standard 9182 for DHW systems with recirculation
on the risers, recirculation pipes may also need to be laid inside the user
systems. DHW consumption meters are therefore vulnerable to incorrect
circulation, which leads to errors in total consumption readings (actual
user information). The scan option can be used to distinguish between
actual and incorrect (or gross) flow rates, providing an exact DHW
consumption value for the division of expenses. The option must be
linked to the CONTECA
®
EASY heat meter supply; its on-site application
and setup must be carried out by Caleffi technicians or staff from an
authorised service centre.
The option requires setting of a recirculation flow rate (threshold), if
drawing does not take place. Every time the detected flow rate is lower
than the set threshold, only the GROSS register is increased, while -
when the flow rate is above the threshold - both registers (GROSS
and NET) are increased.
The following appear on the display:
- NET consumption
- GROSS consumption
- DHW flow rate
1
m
3
1
m
3
G
m
3
/h
To maintain a constant recirculation flow rate, a flow rate limiter with a
setting value under 100 l/h must be fitted to the return branch of the
apartment recirculation network. Furthermore, a specific flow meter
must be used, with a pulse weight of 1 litre (see code 794204/C1 and
code 794205/C1).
Application diagram, code 755826
13
