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2. Has a clearly marked OFF (0) and ON (I) position.
3. In OFF position lockable, to secure against unauthorized or unintentional restart.
4. For outdoor installation the main switch must be at least IP65.
5. Interrupts the power supply to the AHU (lighting can be excluded, refer to chapter 7.6 (Light-
ing)).
6. Separates the electrical equipment from the main supply.
7. Is easily accessible
8. Mounted within sight of the AHU.
9. The allocation to the AHU can be clearly seen.
10. Emergency stop function: The main switch (red switch with yellow background) must be con-
nected to the control system with appropriate components in order to ensure the emer-
gency stop function works effectively. Reset means that a manual start command – separate
from main switch – must be activated.
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Control box is equipped with main switch in execution RED-YELLOW as specified above
It is the responsibility of the client to ensure that the above specified requirements, according to
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DIN VDE 0660 and IEC 947-3, are complied with and main switch fulfills
a) items 7 to 9
b) item 10, implementation of emergency stop function in control system
7.4
Electric heaters
An electric heater is designed to heat the airflow, which is stated on the technical data sheet, from
the specified air inlet temperature to the air outlet temperature. TRANE provides electric heaters
with one or more stages according to customer requirements.
The control of the electric heater provided by the customer can be carried out in several ways:
On-Off at single-stage electric heater (this type of control decreases the lifetime of the electric
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heater under circumstances significantly)
On-Off at multistage electric heater
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Continuous (e.g. with suitable thyristor control)
Fire risk!
With the electric heater in operation, the heating elements may arrive to a tem-
perature of several hundred °C.
In case of malfunction, for example, heater in operation without adequate airflow,
inadmissible temperatures may occur. Furthermore, plastic parts for example, fil-
44/115
Figure 69: Main switch
V07-19.0
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