46 systemair
3.7.2 Water heating coil
Caution
See also section 3.1 General instructions and 3.7 Heating and cooling coils.
In the event of high heating medium temperatures (above 70 °C), arrangements must be provided
toprotectthefanelectricmotorfromoverheatingduringunitidling;thisisachievedbyautomatically
shutting off the supply of the heating medium into the heating coil and continued operation of the fan for
a certain period of time (3 to 5 min) after unit operation has stopped.
Check before Commissioning
• Thetightnessofthethreadedjoints;tightenthemifrequired,
• the proper functioning of the heat exchanger automatic anti-frost protection,
• the tightness of the piping joints,
• the proper functioning of the automatic shut-off of the supply of the heating medium into the heat exchanger at a
heating medium temperature of 70 °C, to protect the electric motor against overheating.
Maintenance
In order to ensure smooth performance of the heat exchangers, the following operations should be carried out
regularly:
• Checkthatthewaterconnectionsareleakage-freeandthattheairjointsarermlymountedandleakage-free.
• Checktheventingfanoperation.Intheeventofdisturbancesinthemediumowthroughtheheatexchangeror
the formation of air cushions, vent the piping system.
• Checktheoperationoftheheatexchangerautomaticanti-frostprotection.
• Periodicallychecktheoperationoftheautomaticshut-offofthesupplyoftheheatingmediumintotheheat
exchanger with the unit stopped.
• Checkthecontinuedoperationofthefan(for3to5min)aftertheunitisstoppedtoprotecttheelectricmotor
against overheating.
• Regularlychecktheheatingcoilbladesfordustbuild-up.Dustorscalebuild-uponbladesreducestheheat
exchanger capacity. Clean the blades at regular time intervals – approx. every 500 hours of operation.
Tocleantheblades,blowthemwithcompressedairinthedirectionoppositetheairowdirection.
Ifsuchcleaningprovesinsufcient,disconnecttheheatingcoil,slideitout,andwashwithlow-pressurewaterorsteam.
Do not use high-pressure water or steam in order to avoid deforming the aluminium blades. If washing with water, the
pressure thereof must not exceed 15 bar and the jet must be directed strictly parallel to the blades. Exposure to a water
jet at an angle will damage the blades. This applies even more so to the blades at the edge, since these are even more
fragile.
Caution
Under no circumstances should you attempt to clean the blades with a hard object.
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