Danfoss TP5000 si range Manual do Utilizador descarregar pdf (Página 3)

If a property has a mechanical thermostat installed,

then the energy-saving bene ts of a replacement

high-e ciency condensing boiler will not be

realised as the boiler will rarely be running in

condensing mode. Switching to an on/o electronic

room thermostat produces reductions of over 2% in

both energy cost and carbon emissions.

Use of an electronic thermostat with chrono-

proportional capability provides closer temperature

control plus possible reductions of 10% in both fuel

cost and carbon emissions (see  g.1). These results

are from tests using Danfoss controls. Tests carried

out with other manufacturers’ on/o controls

produced similar  gures.

With a condensing gas boiler Chrono-6 also has the

bene t of ensuring the boiler remains in condensing

mode more often than might be achieved with

a more basic on/o mode of operation. This

occurs due to the faster reaction rate ensuring the

returned water maintains the boiler in condensing

mode over more of it’s operating cycle, even at low

heat loads.

With slower reacting controls the water can

cool in the system too much and hence require

full circulation before the condensing cycle is

functional and with a low load this might actually

not occur, hence a condensing boiler might only

give the performance on a non-condensing type

when in low load with a slow control.

Energy Savings

In tests at Danfoss Randall we have observed

energy savings of over 10% on a weekend pro le

and over 6% on a week-day (2-heating period

or “bi-modal”) pro le when running a system

with a chrono-proportional control rather than a

mechanical thermostat.

Conclusions

Changing the boiler alone from non-condensing to

condensing in a domestic central heating system

will not necessarily optimise potential energy

and carbon emission savings. An electronic room

temperature control, preferably with chrono-

proportional capability, is often needed to make

the cost of replacing the boiler worthwhile.

Source: Danfoss Randall Ltd. test laboratory 2007

Figure 1

TP5000 Si Range

Fit Chrono Poroportional Controls and save costs

RX1

1 2

ELECTRONICS

N L

COM

ZONE

1 ON

ZONE

1 OFF

Wiring Details

TP5000M Si

RX2-C

456

ELECTRONICS

COM

ZONE 1

COM

ZONE 2

ZONE 1

OFF

ZONE 2

OFF

ZONE 1

RX2 and RX3

ELECTRONICS

C 1

3 4 5

ZONE

1 ON

ZONE

1 OFF

ZONE

2 ON

ZONE

3 ON

COM

TERMINAL 6

RX3 ONLY

TP5000 Si

Control Energy Cost (£)

Energy Saving

(%)

Carbon

Emissions

(kg CO

”

)

Carbon Saving

(%)

Mechanical On/Oﬀ 2.39 - 13.56 -

Electronic On/Oﬀ 2.34 2.10 13.25 2.31

Chrono- Proportional 2.14 10.35 12.11 10.71

Remote Input

(TP5000MA Si only)

Electronics

1 2 3 4

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