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| EN
EIOM v2018.04
IMPORTANT:
Control system must be grounded. Ground terminal is labeled with “PE” or symbol .
NOTE: Connecting power supply cable to the main switch make sure cable wires are tightened and secured from toutching each other.
During control system check inspect for power supply cable loose.
General
Before power supply is switched on to the control system, make sure:
• Control system is not damaged;
• All cable connections (if any) connected properly;
• All cables connected to the control system and not damaged;
• Control system is grounded;
• All circuit breakers turned on;
• Fan safety switch turned on (if any);
• All temperature and air quality sensors connected and mounted.
IMPORTANT:
All control systems supplied with four pole main power switch (L1-L2-L3-N).
When main power switch is in OFF position, all three phases and neutral conductor will be disconnected from power supply.
There is electrical distribution system with TN-C network, when neutral conductor (N) cannot be disconnected from main power supply. In that
case wire jumper is connected between earthing terminal (PE) and neutral terminal (N) on the air handling unit main power switch (Figure 10.3)
Figure 10.3 – Power supply connection to the air handling unit control box when electrical distribution system is with TN-C network:
(1) – Power supply source; (2) – Earthing at power supply source; (3) – Air handling unit; (4) – Wire jumper between earthing terminal (PE)
and neutral terminal (N); (5) – Air handling unit main power switch;
Marking symbols according to the standard IEC 60617-11:
Neutral conductor (N);
Protective conductor (PE)
Combined protective and neutral conductor (PEN)
