Vapac LR10 Operation Manual
Also see for VapaNet Series: Operation manual
                                            | |
Contents
| 
141.5.5 Sensing HeadThe units are designed to operate using a sensinghead, supplied by Vapac Humidity Control Ltd. whichshould be connected as shown below. Otherpropriety sensing heads which give a DC signalmay also be used, providing the control signal isconnected to control terminals 5 & 6, and thesensing head is powered externally from the unit.If “Frost Protection” is required do not connectthe thermistor input from the sensing head tocontrol terminals 1 & 2, which should be used toconnect the “frost protection thermistor” (partnumber 1220275) instead. Frost protection isselected via the display – Set the frost demandabove the minimum cylinder demand (LE units>20%; LE(P) & LE(C) units >8%)Note:Use of the 24V supply of the VAPANET unitto power other items of equipment willinvalidate the Vapac warranty.1.5.6 Security Circuit / E.P.O. ShutdownAs standard units are shipped such that terminals 9 &10 are provided for connection of an E.P.O.(Emergency Power Off) switch or fire shutdownfacility. Other control interlocks, such as high limithumidistat, airflow switch and/or fan interlock and timeswitches etc. should be connected to terminals 11 &12. Please note that if a display is connected tothe unit “DI1 Control Option” must be set to“Shutdown”.NB breaking terminals 9 & 10 will prevent any unitoperation including frost protection.1.5.7 Load Shed OptionThis can only be evoked via a display, either “hardwired” or hand held. When this option is selected,making the connection between terminals 11 & 12 willactivate the “load shed” software routine, which willinhibit the operation of either the unit or in the case oftwin cylinder units unit or just the 2nd cylinder. This willlimit the power used during peak supply periods. Ifthis option is selected, the fan interlock, airflow switchand/or high limit hygrostat should be wired intoterminals 9 & 10 with the EPO switch if fitted (as perthe drawing on the far right). It should be noted thatselection of this option will mean that frost protectioncannot be utilized.Please note that if a display is connected to theunit “DI1 Control Option” must be set to thefollowing:Single cylinder units: “Load shed”.Twin cylinder units: either “Load Shed Cyl 2” or“Load Shed Both”.Vapac’s accessory kit part numbers for sensors areRemote Room mounted sensing head FVKIT-107AndRemote Duct mounted sensing head FVKIT-10812456789101112VapacHUMIDITYSENSOR9 VOLTPOWER SUPPLYTEMPERATUREANDHUMIDITYSENSORThermistorThermistor+9 Volt0 Volt Ref.RH Output11101287612459Load ShedStandard Operation Load Shed Operation95421678121011E.P.O.Fire StopFanAir FlowHigh LimitInterlockSwitchHygrostat HygrostatSwitchInterlockHigh LimitAir FlowFanFire StopE.P.O.NB. The total cable length of the network (using the cable recommended by V.H.C.L. – Our part number 8040251) is 500 m and it shouldbe assumed that there is 1 m of cable in each unit of the “system” (including the “master”). |
manualsdatabase
Your AI-powered manual search engine