HIT
Inst Issue 14: 18.10.17
4.4 A minimum of 1 metre of duct at least the same diameter as the fan spigots diameter
is to be fitted to the fan inlet and discharge spigots. Fans can be pushed directly into the
duct and fastened. Make sure the ducting system is not deformed or twisted. For
mounting, we recommend using cushioned fast clamps to reduce noise transmission into
the ducting system. This requires a tool for fixing.
4.5 Minimum 150mm clearance between the fan and the surrounding structure should be
reserved. See dimensional data section 7.
4.6 Each HIT unit comes pre-fitted with an M20 cable gland, tightened to the terminal
box to 50N force. Suitable for receiving a HO5VV-F 3 x 0.5-1.5mm² cable between
7mm minimum diameter and 10mm maximum diameter. Strip the cable outer sheath
exposing the individual cable cores. Leaving sufficient space for the cables to be
separated and fixed into the terminal strip connections. Strip each individual core back
10mm, exposing the cable.
Ensure the dome cap is tightened enough that the cable is securely clamped and cannot
move.
Tool requirments (not supplied)
24mm Spanner
Terminal screw driver
4.7 If the supply cord is damaged, it must be replaced by the manufacturer, its service agent
or similarly qualified persons in order to avoid hazards.
4.8 Check the details on the motor rating plate to ensure that the correct power supply
(voltage, frequency and phase) is available. An incorrect power supply will lead to
permanent damage to the fan motor.
5. Start-up
5.1 Before power is supplied to the unit, check that the wiring is correct as per the fan
connection diagram.
5.2 At initial start-up, check that impeller rotation and airflow direction is correct.
5.3 Check that the motor amperage draw does not exceed the nameplate rating.
Strip the cable
Earth cable must
be 10mm longer
Loosen the
dome cap
Push cable
through the gland
Cable must not be taut
Inside the terminal box
Tighten the dome cap
