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FAN OVERHEATING
CLOGGED FILTER SIGNAL
When one electric motor is overheated and thermo-contact stops it, other motors remain in operation. Thermo-contact is
automatic one, so when the motor cools down, the thermo-contact returns to its original position and the fan starts again.
This situation is not indicated on any type of control systems. This state can be recognised by reduced air curtain output and
in case the air curtain heats, the air flow temperature in the place of fan failure rises up. This failure cannot be considered to
be a normal one. It is necessary to check the air curtain and to find out the reason of fan failure. The reasons are usually as
follows:
- 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.
- Defective fan this is the less frequent cause. It is necessary to call the authorised service centre and to change the fan.
When a filter is clogged in any air curtain, signal FILTER appears (on DA type control systems only). In case the signal is on,
it means that the filter is clogged so it prevents the air curtain to operate properly and so it is necessary to clean or change the
filter. As to other control systems than DA, you recognise the clogged filter by its higher noise level and by reduction of its air
output (see “Air curtain maintenance”).
E
FILTER
USE AND SETTING OF TIME SWITCH
OPERATION INSTRUCTIONS
After electric connection of time switch the shown keys have to be pressed simultaneously.
Reset (Total clearance of the time switch).
Just after the reset you have to decide how do you want to use the switch:
1. Switch OFF/ON in pre-set time intervals the same for all weekdays (use „Easy setting“)
2. Switch OFF/ON in pre-set time intervals depending on selected day(s) in a week
(use “Setting for individual selected day”).
HOW TO START ?
Electrical connection of the time switch shall be made by an authorized person according to the national regulations
and directives. Manipulations and modifications on the switch will result in loss of warranty.
Note:
In spite of an internal safety control, unusual strong noise fields could cause a disturbance of the microprocessor-
controlled time switch.
Interference can be avoided if the following details are considered during installation :
- the device should not be installed close to inductive consumers
- there has to be layed a separate line for the mains supply (if necessary mains suppresion filter)
- inductive consumers should have to be interference suppressed (varistor, RC-section)
After having cleared the interference a reset of the time switch is necessary.
Current time/
switch ON/OFF time
Weekday(7 = Sunday)
Hours setting
Weekday setting
Time setting
Program entry / recall
Response time number for the weekday
indicated (1 ON, 1 OFF, 2 ON, 2 OFF,
3 ON, 3 OFF) H = Holiday program
The point indicates permanent
control ON or OFF
Indication of actual switch position
ON = Switch ON, OFF = Switch OFF
Minutes setting
Switching between automatic or
manual control
INSTALLATION
d
h
m
h
For return from program mode you can choose these two ways :
1. press button
2. if there is no interruption (no action) on time switch for 40 seconds it returns automatically
For possibility of choosing between two basic settings (see “How to start”) you have to first press Reset.
CONTROL PRINCIPLE
After Reset is done you can set the current time. You need to keep the button + press
>>h<<
(for setting hours) and
press
>>m<<
(for setting minutes). Arrow that displayes actual selection of the day will appear above symbol 1-7.
Attention:
If you want to use “Easy setting” (see point 1 in chapter “How to start”) do not
press button
>>d<<
during setting the time !
This easy program offer 6 different pre-set time intervals Switch ON/Switch OFF
(6 ON/OFF) without selection of the weekday. These pre-set time intervals will repeat every day the same.
EASY SETTING (1-7)
DS 1800
1 2 3 4 5 6 7 1 7
DS 1800
TIME GUARD
1 2 3 4 5 6 7 1 7
d
h
m
h
H
OFF
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