Biddle MAT Installation, Operation And Maintenance Manual page 11

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NSTALLATION PERATION
Separation between the climates while the
door is closed.
Separation between the climates by the MAT
air curtain, while the door is open.
cold store climate
front hall climate
Figure 1-3 Working principle
of the corridor
Version: 4.0 (19-02-2003)
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AND AINTENANCE UIDE
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Purpose of the heating
By the heating of stream B, its relative humidity is reduced:
this prevents the development of mist in the air curtain.
To save energy, the heating level should be as low as possible.
The minimum required level depends on the climate condi-
tions in the cold store and the front hall. If your MAT air cur-
tain has a humidity sensor (optional), it can set the heating
temperature automatically.
Purpose of the corridor
The corridor is essential for the working of the MAT air cur-
tain.
While the cold store door is closed
arates the climates of the cold store and the front hall. When
it is opened, the MAT air curtain becomes the effective separa-
tion instead (Figure 1-3, below). The corridor is then neces-
sary:
• to keep both climates separate, there where they are not
separated by the air curtain,
• to lead the air from the cold store into the air curtain unit
and back without disturbance.
Note:
Even small openings disturb the working of the air curtain,
making it ineffective. Therefore:
- the corridor must be free of air leaks at all places,
- the corridor must fit narrowly to the air curtain unit.
Note:
While the MAT air curtain is in effect, the walls of the cor-
ridor separate the air that is lead from the cold store, from
the warm and humid air in the front hall. Therefore:
- the corridor must be thermally insulated at all places,
- cold bridges must be avoided.
Otherwise, undesired precipitation of water and/or ice will
occur on the outside, which may cause unhygienic situa-
tions.
I
NTRODUCTION
(Figure 1-3, above), it sep-
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