KOJA Future Series - 8 Heating Section, Electrical Flte; Operating Conditions; Operation; Commissioning

AIR HANDLING UNIT FUTURE
INSTRUCTIONS FOR OPERATION AND MAINTENANCE
Heang secon, electrical FLTE
28 V. 2.0 2017-02-13
8. HEATING SECTION, ELECTRICAL FLTE
8.1. Operating conditions
• The maximum permissible operating temperature is +150 °C.
8.2. Operation
The thermostat switches the heating off when the temperature exceeds the set point of 75 °C, and then back
on when the temperature falls below the set point. The overheating protector is a safety device that switches
off heating if the temperature for some reason, like a fault, rises over the permitted value (147 °C). It is reset to
operate manually, but first, the reason for the abnormal operation must be found out.
WARNING
The overheating protector is a safety device that must never be by-passed. The activation
of the overheating protector can be indicated with an alarm.
A case-specific electrical connection diagram is supplied with the delivery.
8.3. Commissioning
• Make sure that the heat transfer surfaces of the coil are clean and intact.
• Make sure that there is no flammable material inside the coil within 100 mm of the coil’s lamella surface.
• Make sure that the capillary tube of the overheating protector is intact.
• Check the electrical connections and joints and the direction of air flow, which must be according to
the arrow marked on the section.
• Give the coil a test run. If the overheating protector trips during the test run, there is a fault in the
unit. Locate and rectify the fault immediately. After that, reset the protector.
• Make sure that the fan starts before or at the same time with the heating power, and that it stops at
the same time with the heating power switch-off or after the switch-off.
8.4. Maintenance
• Before you start maintenance work, make sure that the coil voltage is switched off.
• Make sure that the heat transfer surfaces of the coil are clean and intact.
• Clean gently with a brush, compressed air or a vacuum cleaner, DO NOT USE WATER. Bent lamellas can
be straightened with a lamella comb, available from the heat exchanger supplier.
• Make sure that there is no flammable material inside the coil within 100 mm of the coil’s lamella surface.
• Make sure that the capillary tube of the overheating protector is intact.
• Check the operation of the coil during the test run. If the overheating protector trips, there is a fault in
the unit. Locate and rectify the fault immediately. After that, reset the protector.
• Make sure that the fan starts before or at the same time with the heating power, and that it stops at
the same time with the heating power switch-off or after the switch-off.