SystemAir KA HSI-2-2-S-R-50F-TB2-L2 - Page 52

52 systemair
Check before commissioning
• Thetightnessofthethreadedjoints;tightenthemifrequired,
• theproperfunctioningoftheheatingcoilautomaticanti-frostprotection,beforetheheatingcoilislledwiththe
heat transfer medium,
• the tightness of the piping joints,
• the proper functioning of the automatic shut-off of the supply of heating medium into the heating coil at a heating
medium temperature above 70 °C, to protect the electric motor against overheating,
• the proper functioning of the automatic condensate discharge pot.
Medium lling
• Partially open the steam valve and wait until steam begins to emerge from the draining and venting valve.
• Close the draining and venting valve and fully open the steam valve.
Caution
Takecareofpossibleveryhighmediumtemperaturewhendraining.
Medium draining
• Close the steam supply valve and open the draining valve.
• Oncedrainingisnished,openthesteamvalveonceagaintoletallthecondensatedrainfromthesection–until
steam emerges.
• Close the steam valve.
• Let the draining valve open until the next restart.
• Upondrainingtheheatexchanger,drythetubebankbyblowingitwithcompressedairtoabsolutelypreventthe
riskoffreezingofanyresidueofheatingmediumorcondensate.
Protection against the fan motor overheating
In the event of high steam temperatures, arrangements must be provided to protect the fan electric motor from
overheatingduringunitidling;thisisachievedbyautomatically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 the unit operation has
stopped.