CALEFFI 750706 Manuel - Sayfa 13

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755826

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

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).

Option code 755826 is supplied with an AUTOFLOW

1/2" connection and a nominal flow rate of 40 l/h, code 127141

M04

Application diagram, code 755826

ELECTRICAL - ELECTRONIC OPTIONS

with a

755810

Cooling units metering

Upon activation of the software module, CONTECA

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.

75588.

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.

Code

755881

Single pulse output - HEATING UNITS

755882

Double pulse output - HEATING/COOLING UNITS

Terminals 2 - 3 Heating units

CONTECA

EASY

RS485

755881

7507 . .

Acquisition board

755890

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

): max 75 m.

CALEFFI

ENERGY kWh

0 V

755825

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.

EASY is able to

Terminals 1 - 2 Cooling units