8
01
8
Air Heater
WD-A, WD-U
Assembly
05
Do not twist connection piece!
(This will destroy the heat exchanger. No warranty).
When fixing screwed flanges at the advance and return of
the heat exchanger, hold against with a suitable tool.
For later inspection work, it is purposeful to provide a
slide valve in front ot the heat exchanger.
Remove the protection caps from the connecting pipes.
Important: Connect the machine acc. to the counterflow
principle. Advance and return cf. 05.04.
Frost protection for heat exchanger:
In case of outside air operation, provide anti-frost thermo-
stat on the air exit side of the heat exchanger!
05.05 Ventilation Valve and Emptying Cock
Pay attention that the ventilation valve is installed at the highest point. Arrange the emptying cock at the lowe-
st point, so that a complete emptying of the heat exchanger is possible. As a precaution, blow through the heat
exchanger with compressed air in order to achieve a complete emptying (
frost protection
).
05.06 Motor Protection Louver
The installation of the motor protection louver is necessary in case
of higher heating media in order to protect the fan motor from
overheating when it stands still. The thermo-contacts integrated
in the motor would react and stop the motor. Therefore use motor
protection louver in case of high advance temperature of the heating
medium. Without motor protection louver, WD-A-machines may be
operated up to an advance temperature of the heating medium of:
Wall Machine Ceiling Machine
without accessories
(free suction- extraction)
130 °C
120 °C
with accessories (at the suction)
120 °C
120 °C
In case of higher heating media from pump hot water 130 /100 on,
from vapour 4 bar on, the motor protection louver (order No. 595)
must be installed between heat exchanger and motor.
Attention:
When using the motor protection louver, the sheet bracket long (order No. 650) is required for wall and
ceiling assembly.
Additional measures / replacement measures:
•
If the operation is unregulated by the heating medium, install
motor protection louver.
•
If the operation is regulated by the heating medium, provide
fan disconnection, when the regulation valve is closed.
Especially in case of an advance temperature of the heating
medium of more than 180 °C, to be provided by all means.
Apart from the motor protection function, the motor protection lou-
ver can also be used as frost protection flap at machines with pure
outside air operation.
Function: Fan off - motor protection louver (frost protection flap) closed.
300 mm
