This document may be subject to change Side 8 of 23Heating surface, water Connecting the heating surface must be done by an authorized plumber. If the unit is placed outside or in a cold location the installation must frost secured.The heating unit is delivered as accessory and consists of: electrical box with LMC200-PCB, heat-ing surface with temperature sensor T9 and frost-protection B3, actuator and regulating valve.The heating surface is to be installed in the inlet ducting just after the VPL unit. The heating sur-face must also be activated in the CTS 600 control as described on page 13.The mixing loop can be constructed as suggested below.The heating surface should be connected, scavenged and checked for any leakages before start-ing the unit.The dirt-catcher should be checked and cleaned after a thoroughly flushing of the system.Air flowFlowReturn B3T921M Heating surface3Note that the temperature sensor T9 and frost-protection B3 is placed at the heated side of the heatingsurface close to the return connection. See electrical chart.1: Actuator and regulating valve:Danfoss AME 140/24V 0-10V signal, 2-way valve VZ2 Kv 0,4, (Nilan delivery) Kvs-value must bechecked in accordance with supply.Differential pressure: 0,1 – 0,6barThere is calculated with a cooling of 20°C over the heating surface at a flow of 60°C.2: Scavenging (not Nilan delivery)3: Dirt-catcher (not Nilan delivery)Figure 5: Connecting the heating surface, suggestion