3
Air curtains
Application, Operating Conditions and Construction
Information from the manufacturer
DoorMaster door curtains are manufactured in compli-
ance with the valid Czech and European technical regu-
lations and technical standards.
Doormaster air curtains form an unobtrusive aerodyna-
mic barrier in order to suppress the free ow of air be-
tween an inside and outside environment, at the entran-
ce to a building for example, and an environment with
various conditions (different temperatures, dustiness,
insects etc). A second integral function of the curtain is
the mixing of the air that remains after entering with the
air that has been heated in the room where the curtain
is installed, which reduces the negative feeling evoked
by the ow of cool air. The manufacturer recommends
the use of a curtain without heating (version N) only in
particular cases where there is a reason for it (to se-
parate an air-conditioned room for example) when the
use of built-in heating is unsuitable. The curtains are
to be installed and used only in compliance with this
documentation. Any other usage does not comply with
their designated purpose.Neither the manufacturer nor
the supplier can assume responsibility for damages
that arise from such misusage, and the user carries
the whole risk. The operating and service personnel
must have access to the mounting and operating docu-
mentation, and it is expedient to place it in the vicinity
of the curtain. The valid safety instructions, norms and
generally recognized technical regulations are to be re-
spected when handling, assembling, connecting to the
mains, putting into operation, as well as during repair
and maintenance work on the equipment. All conne-
ctions of the device must comply with the appropriate
safety standards. Any changes and modications of the
units that might inuence safety may not be done wit-
hout the agreement of the manufacturer/supplier. The
same applies to the installing and setting of protection
equipment and valves. Before installing and using, it is
necessary to familiarize yourself with the following in-
structions and to respect them.
Usage and operating conditions
DoorMaster air curtains are designed for inside in-
stallation in a dry environment in a horizontal position
above the door opening. The curtains are not intended
for vertical application and cannot be installed next to
the door opening. The maximum height recommended
for the installation is 2.5 m for curtains of the C1 series
and 3.0 m for those of the D2 series.
The curtain can operate in air void of coarse dust
particles, lubricants, chemical vapors and other con-
taminants. The curtain is intended for an environment
with a normal inuence classication (ČSN 33 2000-1
ed.2). Its usage is prohibited in an aggressive environ-
ment, outdoors, in a moist environment with dangerous
condensation or in an environment with a dangerous
explosion! The version with electric heating and the
version without heating can be operated at temperatu-
res as low as -5 °C (provided there is no condensation
in the environment). The version with a water exchan-
ger (W) is not safeguarded against freezing and must
be installed in a non-freezing area, i.e. +5 °C to +40 °C.
Otherwise, a sufcient supply of heated water must be
provided so that the medium in the water exchanger
does not freeze.
Door curtains are intended for connecting to the po-
wer-supply system 1x230V+N+PE /50Hz or 3x400V+-
N+PE /50 Hz (according to the type or heating of the
curtain). The main lead-in must be properly protected
with the possibility of a safety disconnection in order to
ensure a non-voltage state. The fuse of the main lead-
-in must be equipped with a shut-off release, which is
an indispensable component of the protection system
for an air curtain against over-heating. The electrical
connection must comply with the diagram. A curtain in
the standard version is prepared for connecting external
drivers. The external drivers (shut-off switches) must
be dimensioned at least to the value for inductive load,
which is listed in the corresponding tables of this docu-
mentation.
As standard equipment, the door curtains are fur-
nished with fan motors that have thermal contacts led
out to the cable that ensures disconnection of the power
supply to the motor or to the electric heating when there
is an over-load. Fuses provide for short-circuit protecti-
on of the motor and of the control circuits. The fans are
furnished with motors that have thermal insulation for
the winding of the F class.
Curtains with water heat exchanger are intended
with no limitations for higher medium temperatures (up
to 70 °C). For even higher ow temperature is it nece-
ssary to t thermostatically controlled inlet valve TVW
TVW-P or-R and the valve head has to limit the heat
transfer rate to a maximum temperature of 40 ° C (tem-
perature of the outlet air from the air curtain).
The maximum permissible operating pressure of the he-
ating water in the exchanger is 1.5 MPa. When conne-
cting pipes are used to connect the exchangers, their
maximum permissible operating pressure (1.0 MPa)
must be respected.
The level of acoustic output that is emanated with
the air from the device is listed below in the correspon-
ding tables for the appropriate types.
Construction of the air curtain
C1 curtains
The curtain's construction is frameless with covering
panels made of varnished sheet metal in the shade
RAL 9002 and with plastic sidewalls. The components
used are from leading European manufacturers: special
tangential fans from the company Punker and energy-
-saving EBM motors (with an input power of only 130W
for a length of 1 m), a two-row CU/Al water exchanger
(version W) in all lengths with one connection for the
media, an electric exchanger with stainless coiled hea-
ting rods (two outputs - version E1 and E2). The over-all
electric protection of the covered curtains is IP 20.
D2 curtains
The internal chassis with covering panels is made of
varnished sheet metal in the shade RAL 9002.
