Carel MasterAria, Руководство пользователя

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33
ENG
MasterAria +030220481 - rel. 1.0 - 12.11.2007
U P+I output H heating
P109 dead band C cooling
P119 minimum damper position TA room temperature
(control probe)
The proportional damper features a minimum position, set by the user
(P119), below which the damper cannot be closed, except in the event
of alarms.
It is opened beyond the minimum position if the freecooling and
freeheating conditions require.
Freecooling and freeheating
The freecooling/freeheating function is used to exploit the outside
temperature conditions, when these are favourable, adjusting the
opening of the outside damper.
To be able to use these functions:
connect and enable the outside and room temperature probes;
•
set the freecooling diff erential;
•
set the freeheating diff erential.
•
In the summer period, the conditions to allow freecooling are:
T
Room
- T
OUTSIDE
> Freecooling activation delta (P104)
P114 P109
0%
100%
S
TA (°C)
1
Fig. 4.x.a
Key:
S outside damper
TA room temperature (control probe)
1. set point
If the condition is satisfi ed, then the damper starts opening according to
the normal control signal, based on the control probe reading.
In the winter period, the conditions to allow freeheating are:
T
OUTSIDE
- T
Room
> Freeheating activation delta (P105)
P114 P109
0%
100%
S
TA (°C)
1
Fig. 4.x.b
Key:
S outside damper
TA room temperature (control probe)
1. set point
If the condition is satisfi ed, then the damper starts opening according to
the normal control signal, based on the control probe reading.
Disabling:
To disable the freecooling and freeheating functions, set the
respective diff erentials to zero (parameters P104 and P105).
Prog. Description Def1 Def2 Def3 Min Max UOM
15 Function of probe B1
6 Outside probe
7 7 7 0 7 ---
16 Funct. probe B2 (par.
table) 4 2 4 7 ---
17 Funct. probe B3 (par.
table) 6 6 6 0 7 ---
39 Confi g. output NO4
19 Open 3-point
outside damper
20 Close 3-point
outside damper
21 0 to 10 Vdc
outside damper
13 13 9 0 24 ---
40 Confi guration of output
NO5 (see P39) 14 21 10 0 24 ---
41 Confi guration of output
NO6 (see P39) 23 18 19 0 24 ---
42 Confi guration of output
NO7 (see P39) 0 24 20 0 24 ---
104 Freecooling activation
delta 0 20 20 0 255 °C/10
105 Freeheating activation
delta 0 20 20 0 255 °C/10
Tab. 4.m
Heat recovery unit
The MasterAria can manage cross-fl ow heat recovery units, with the
corresponding bypass damper. The heat recovery unit is an excellent
device for ensuring energy saving, as it exploits the air discharged from
the environment to heat (in heating mode) or cool (in cooling mode) the
outside air taken in by the AHU.
Aria
esterna
Aria di
espulsione
Aria
ambiente
Aria di
mandata
Fig. 4.y.a
The role of the bypass damper is to bypass the heat recovery unit
when the outside and room temperatures would not allow good heat
recovery.
Normally, the heat recovery unit is bypassed when the outside conditions
are favourable, that is, when freecooling or freeheating are active.
MasterAria can only manage on/off actuators in this case ON/OFF.
Operation:
Cooling
If cooling is required, the bypass damper only closes if: (T
OUTSIDE
- T
ROOM
)
> P127
Heating
If heating is required, the bypass damper only closes if: (T
ROOM
- T
OUTSIDE
)
> P127
Both conditions are maintained for a minimum of 5 minutes, to avoid
situations of instability when the temperature fl uctuates around the set
point.
Antifreeze
If the antifreeze conditions are true, MasterAria opens the bypass
damper.