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6.4
Freeze protection measures
It is the customer's responsibility to provide sufficient freeze protection. Some possibilities for that
purpose is listed beneath:
At cooling coils:
Complete drainage of the heat exchanger
-
-
Usage of water/glycol fluid mixtures with adequate glycol concentration. Performance loss must
be considered.
At heating coils:
Control-technological frost protection: Installation of a thermostat on the air outlet side for alarm
-
triggering (Setting trigger temperature 5 °C). In the event of an alarm, the mixture valve opens
(100%), the heating circuit pump gets a signal and the fan is switched off automatically.
7
Electrical connection
The electrical connection must be executed in compliance with international regulations such as
-
the Low Voltage Directive and the requirements of electromagnetic compatibility of national leg-
islation and the requirements of the local electricity provider.
-
All electrical connections must be inspected annually and deficiencies (for example, loose cable
strands, loose screw and clamp connection, etc.) must be eliminated immediately.
7.1
Connecting to an external protective conductor system
The AHU must be connected to an external protective conductor system. The AHU shall be either:
connected at the base frames or
-
alternatively, at the potential compensation, that is mounted on the flexible connection by
-
TRANE.
Furthermore, each electrical component must be connected to the protective conductor system.
The connection to the external protective earth system has to be executed according to EN 60204-
1, pt. 5.2. The minimum cross-sectional-surface of the earth at frequency converter has to be
10 mm², otherwise 4 mm² at AHUs with control. Depending on the cross-sectional-surface of the
outer conductor, the requirements regarding minimum cross-sectional-surfaces of the protective
earth system according to EN 60204-1, pt. 5.2, table 1 have to be considered additionally.
After assembling and installation the consistency of the protective conductor system has to be
checked and documented according to EN 60201-1, pt. 18.2.
Lightning protection for roof AHUs
A lightning protection, especially for ATEX roof AHUs, must be professionally in-
stalled on site according to national rules. Otherwise, a fire can be caused by a
lightning strike.
Correct direction of motor rotation is a result of direction of fan impeller rotation which is marked by
an arrow: for EC fan refer to Figure 68.
Before connecting the motor check the rotating field of mains connection with a suitable device. Af-
terwards, connect the phases accordingly to main switch.
42/115
V07-19.0
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