KA IMO 2021 6 V2.1

44 systemair
3.5.3 Run around coil
Caution
See also section 3.1 General instructions.
See the values in the selection program data and on the nameplate.
For Commissioning and maintenance of coils see also sections 3.7.2 Water heating coil and 3.7.3 Water
cooling coil.
Inpreparingthewater-antifreezemixture,followtheinstructionsandpreparethemixtureofthespecied
concentration, since too high a concentration reduces the heat exchanger thermal power, while too low a
concentrationposesariskofinadequateprotectionagainstfreezingatlowoperatingtemperatures.
Commissioning (Hydraulic circle)
• Makesuretoproperlyconnecttheheatexchangers:theymustbeconnectedinacounter-owconguration(air
inlet side = medium outlet side).
• Thecirculationpumpmustmeetthedesignspecications.
• Install venting and draining valves at appropriate points.
• Inordertoavoidtheriskofcondensatefreezingonthenpackage,themediumtemperatureattheinletofthe
heatexchangerintheextractairowmaynotbelessthan-3°C.
• Connectthehydrauliccircuitinaccordancewiththedesignspecicationsandapplicablesafetyregulations.The
hydrauliccircuitmustbettedwithanappropriatelysizedandinstalledexpansionvesselandasafetyvalve,as
well as with all other necessary elements, depending on the method of control. Figure presents a hydraulic circuit
without controls (left) and a hydraulic circuit with controls (right).
1 Heating coil 2 Cooling coil 3 Condensat tray
Maintenance (Hydraulic circle)
• Regularlychecktheoperationofthecirculatingpumpandmakesuretokeepthepipingbetweentheheat
exchangers properly vented.
• Twiceayear,checktheoperationofthecontrolsystem.
• Atthebeginningofthewinterseason,checktheanti-freezingcapabilityofthemediumandreplaceitifnecessary.
Replace the medium every two years.