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11
UNIT DESIGN AND OPERATING LOGIC
The heaters (see the figure below) consist of a casing with a rigidly fixed connecting box that is with the removable cover.
The tight seals are located at the external side of the connection box for routing of supply, control and ground cables.
The heating elements are located inside the casing.
The casing, the connection box and the heater cover are made of galvanized steel.
The connection box incorporates:
-
terminal block for connection of external supply and control circuits of the heater;
-
screw ground terminal;
-
hermal switches (automatic and manual).
The heaters are equipped with two overheating sensors - thermal switches:
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with automatic reset and temperature threshold value 50 °C;
-
with manual reset and temperature threshold value 90 °C.
Thermal switch with manual reset is equipped with a button for manual restart. The label
RESTART
is near the button.
The electric heater wiring diagram is shown at the internal wall of the connecting box.
NK HEATER FOR ROUND DUCTS
Casing
Electric heating element
Connection box
Removable cover
Electric lead-ins
NK HEATER FOR RECTANGULAR DUCTS
Casing
Electrical terminal
box
Removable
cover
Cable glands
Electrical heating elements
Summary of Contents for NK 100-0,6-1
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