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This element will energise under either one or two conditions : 1. When the external ambient air temperature drops between -5.C and +5.C. This figure is variable and adjustable at the ATC. 2. When the heat pump has not seen a temperature rise of 1.C or more in the Return water from the heating system, in a 20 minute period. The cable sizing to the heat pump must include for this additional 3kW load. For Bivalent systems where a Gas, Oil or Wood Pellet boiler is switched from the heat pump the immersion heater is disconnected. Refer to section 8.8. If the boiler is to be used with the 3kW immersion heater still connected, the additional load must be taken into account and the maximum demand must be determined for each heat pump. 8.3 Controller Using the 5m of umbilical cable, connect the controller (right) to the heat pump (left). The controller fits all standard single patresses (surface and flush). Use one of the cable glands at the rear of the heat pump to protect this cable. To extend (if required) simply splice a new section into the middle, ensuring all connections are sound and water proof. The size of cable is 0.5mm., and operates at ultra low voltage (<50Vdc). Model Input Immersion Boiler Total Total Power Element Load Load Current kW kW kW kW A HPAW65 1.62 3 1 5.62 24.50 HPAW85 2.20 3 1 6.20 27.00 HPAW110 2.61 3 1 6.61 28.70 HPAW130 2.59 3 1 6.59 28.70 HPAW155 2.77 3 1 6.77 29.50 Always assume maximum possible load when considering cable sizing. The cable supplying power from the consumer unit to the heat pump must be connected via an external 2 pole isolator. This allows the service engineer to isolate the power supply before working on the heat pump in safety. Figure 8-6: Mains supply cable connections Red Blue Earth Figure 8-3: ATC connection Figure 8-4: Umbilical cable Figure 8-5: ATC control unit 8 Electrical 8.5 Heat Pump Wiring Diagram The Main Connections you have to make 12 11 10 9 8 7 6 5 4 3 2 1 230 Vac Compressor Heater 4-way valve Expansion Valve Disconnect Electric Element for Bivalent Switched Output Ret Gas Sensor Ext Temp Sensor Coil Temp Sensor Dis Gas Sensor Ret Temp Sensor N Compressor Fan motor Pump Relay KM2 3kW Electric Element Orange Red BlueWhiteBlk Power Supply Terminal 3 Connection points for installer ATC Controller Socket S-Plan Controls Connections 3 2 1 3 2 1 24 23 22 21 20 19 18 17 16 15 14 13C R S 24 Vac Fuse Relay KM1Low pressure switchHigh pressure switch Figure 8-7: Heat pump connection diagram for 3kW electrical element Electrical ATC controller S-Plan controls Power supply socket connections terminal Figure 8-8: Location of connections in control panel 21 Electrical 230 Vac Compressor Heater 4-way valve Expansion Valve Ret Gas Sensor Ext Temp Sensor Coil Temp Sensor Dis Gas Sensor Ret Temp Sensor N Compressor Fan motor Pump Relay KM2 6kW Electric Element Orange Red BlueWhiteBlk Power Supply Terminal 3 Connection points for installer ATC Controller Socket S-Plan Controls Connections 3 2 1 3 2 1 12 11 10 9 8 7 6 5 4 3 2 1 24 23 22 21 20 19 18 17 16 15 14 13C R S 24 Vac Fuse Relay KM1Low pressure switchHigh pressure switch Figure 8-9: Heat pump connection diagram for 6kW electrical element Model 3kW Immersion Heater 6kW Immersion Heater MCB MCB MCB MCB PIn (W) IStart (A) IRun (A) V Hz IStart IRun (A) Type IStart IRun (A) Type HPAW65 1620 22.09 7.36 220 50 35.09 20.36 32 D 49.09 34.36 40 D HPAW85 2200 30.00 10.00 220 50 43.00 23.00 32 D 57.00 37.00 40 D HPAW110 2610 35.59 11.86 220 50 48.59 24.86 32 D 62.59 38.86 40 or 50 D HPAW130 2590 35.32 11.77 220 50 48.32 24.77 32 D 62.32 38.77 40 or 50 D HPAW155 2770 37.77 12.59 220 50 50.77 25.59 32 D 64.77 39.59 50 D Model 3kW Immersion Heater 6kW Immersion Heater MCB MCB MCB MCB PIn (W) IStart (A) IRun (A) V Hz IStart IRun (A) Type IStart IRun (A) Type HPAW65 1770 23.09 7.70 230 50 36.09 20.70 32 D 50.09 34.70 40 D HPAW85 2404 31.36 10.45 230 50 44.36 23.45 32 D 58.36 37.45 40 D HPAW110 2852 37.20 12.40 230 50 50.20 25.40 32 D 64.20 39.40 50 D HPAW130 2830 36.91 12.30 230 50 49.91 25.30 32 D 63.91 39.30 50 D HPAW155 3028 39.50 13.17 230 50 52.50 26.17 32 D 66.50 40.17 50 D The 6kW immersion element is ONLY available as a factory fitted option Assumptions: 1. 30m run from consumer box to heat pump 2. Cable not run in thermally insulated environment: Method A and C only (17th edition) 3. Starting current assumes 3x running current 4. Earth Loop Impedence value does not exceed 0.36W for a D type MCB IMPORTANT: ENSURE INCOMING SUPPLY CABLE AND SUPPLY FUSE ARE OF SUITABLE SIZE Electrical Hlg Zone Valve MCB E L N L N E 4 5 6 7 8 9 10 1 2 3 1 Limit Control 2 c 1 2 c Programmer Room Thermostat Cylinder Thermostat CHHW Gr Br O Bl Off Heat pump S-Plan controls connections 230V 50Hz L N MCB DHW Zone Valve L N L N E 4 5 6 7 8 9 10 1 2 3 1 Limit Control Heat pump S-Plan controls connections 2 c 1 2 Programmer 230V 50Hz Room Thermostat CHHW E Gr Br O Bl Off L N 8.6 System Control Wiring Diagrams Figure 8-10: Domestic hot water connecti...

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