11
Construction and description
2.2
Function
Appliances of the
UN
PLUS
, SN
PLUS
and IN
PLUS
type series feature natural
circulation (convection). For
the UF
PLUS
, SF
PLUS
and IF
PLUS
type series, air is circulated
by a fan at the working
chamber rear panel (Fig. 3 ,
No. 1). It increases the air
flow and provides stronger
horizontal forced air
circulation than natural
convection.
In both the convection and
fan ventilated appliances,
supply air (2) is preheated
in a pre-heating chamber
(3). Through the ventilation
slits in the side panel of
the working chamber, the
preheated air is introduced
into the interior of the
chamber. The supply and
exhaust air (5) volume (air
change) is controlled by the
air flap (4) on the rear panel
of the appliance.
2.3
Material
For the outer housing, MEMMERT deploys stainless steel (Mat.No. 1.4016 – ASTM 430)
and for the interior, stainless steel (Mat.No. 1.4301 – ASTM 304) is used, which stands out
through its high stability, optimal hygienic properties and corrosion-resistance towards many
(but not all!) chemical compounds (caution for example with chlorine compounds).
The chamber load for the appliance must be carefully checked for chemical compatibility with
the materials mentioned. A material resistance table can be requested from the manufacturer.
2.4 Electrical
equipment
►
Operating voltage and current consumption: See nameplate
►
Protection class 1, i.e. operating insulation with PE conductor in accordance with EN
61010
►
Protection type IP 20 acc. to EN 60 529
►
Interference suppression acc. to EN 55011 class B
►
Appliance fuse: Fusible link 250 V/15 A quick-blow
►
The temperature controller is protected with a miniature fuse 100 mA (200 mA at 115 V)
4
1
2
5
3
Fig. 3
Function
1 Fan
2 Fresh
air
3 Pre-heating
chamber
4 Air
flap
5 Exhaust
air
