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There are two levels of protection as standard part of any air curtain. The first one is the operation thermostat with automatic
reset and the second is the safety thermostat equipped with manual reset facility. In majority of overheating cases is the
protection ensured by the operation thermostat, which disconnects the electric heater from operation and after cooling down
connects its back automatically. This failure is not signalled anyhow on any type of controller. It can be recognised by means
that the air curtain does not heat although it should do so according to the setting of the controller.

The reasons of the overheating of the heater may be namely:

- Clogged filter and thus lower air flow - it is necessary to clean the filter (see “Air curtain maintenance”)
- Insufficient space in front of the inlet grille (see “ Principles of the air curtain location”) it is necessary to ensure proper

installation

- Failure of one or more fans in the air curtain - call the service centre to change the fan.

In any case of heater overheating it is necessary to find out the reason and to remove it. When it is a cause of any internal
failure in the air curtain, it is necessary to call the authorised service centre.

When when the safety thermostat is activated, the heater is disconnected , the air curtain stops to heat and when of DA
control system ALARM signal is ON on the control panel.

The cause of safety thermostat activation is usually just one:

- failure of operation thermostat - it is necessary to stop operation of the air curtain

completely, to disconnect it from mains and to call the authorised service centre. In no
case try to remove the defect yourselves !

After service of the air curtain (done by an authorised person), removal of the cause and
inspection or exchange of the operation thermostat, it is necessary to push the RESET
button located on this thermostat in the air curtain (e.g. by use of screwdriver). Remove the
grille first (see” Tilting of the grille”) and then push the reset button. - see Figure.

OVERHEATING OF
ELECTRIC HEATER

ALARM

OPERATION INSTRUCTIONS

CHAINING OF THE AIR
CURTAINS

BUILDING MANAGEMENT
SYSTEM (BSM)

Chaining of the air curtains is possible just in case of DM and DA control systems. It is possible to interconnect up to 6 air
curtains, including the controlling (MASTER) one. When of chained air curtains, the function of controller and external
switch (door contact, thermostat, time switch) exactly the same as when of one air curtain.
Each air curtain has its own electric power supply. All chained air curtains operate in an identical mode.

Central control of air curtains:

It is possible to deliver a module to the air curtains equipped with DA control system, which
enables to connect the air curtain to the central control system of the building.
World standard LonWorks has been chosen for FINESSE air curtains. This system uses a
standard protocol

LonTalk

, thanks to that the air curtain with module supporting

LonWorks

can operate round the world. Will you please call your supplier about the details and basic data
important for the integration into the system. When of chaining the air curtains, it is enough to
equip the MASTER air curtain with the LonWorks module.

Outdoor temperature

reached

Pre-set temperature

on the thermostat

Doors

opened

not reached

opened

reached

closed

not reached

closed