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10.3 Antifreeze To avoid the risk of the freezing in the external section of the heating system (i.e. the flexible hoses, condenser and circulating pump within the heat pump casing) in the event of power failure during winter months, a suitable domestic heating system antifreeze should be used. This is added to the system water when finally filling the heating system. Full instructions are supplied with the system antifreeze, but immediate information can be obtained from and IMPORTANT As with all wet heating systems, it is the responsibility of the installer to remove all the air from the heating system after filling. For technical details and requirements for Sealed Systems, refer to Section 7 of these instructions. For details of the Grant Sealed System kits for use with the Grant Aerona heat pump range refer to Section 15. ! NOTE flushed hot, before the old boiler is Sealed System kit), ensure it is removed and replaced by the heat connected between the two filling pump. valves and that both valves are closed. 11 Commissioning Commissioning 29 11.1 Switching on First Time When switching on for the first time carry out the following procedures in the order they appear. 1. Ensure the external mains power isolation switch is set to the ‘OFF’ position. 2. Energise the heating system inside the house. 3. Create a CH demand using the timer/programmer. 4. Confirm the CH motorised valve has opened. (You may need to adjust the room thermostat to achieve this). 5. At the heat pump control panel, confirm there is no voltage present between terminal 1 and 2 on the S-Plan connections in the Heat Pump control panel – check there is continuity. If voltage is present (230Vac), check the wiring as shown on page 20 and correct as necessary. 6. Remove CH demand. 7. Create a DHW demand (if applicable) using the timer/programmer. 8. Confirm the DHW motorised valve has opened. (You may need to adjust the cylinder thermostat to achieve this). 9. At the heat pump control panel, confirm there is no voltage present between terminal 1 and 3 on the S-Plan connections in the Heat Pump control panel – check there is continuity. If voltage is present (230Vac), check the wiring as shown on page 20 and correct as necessary. 10. Create a CH and DHW demand using the timer/programmer. 11. Confirm the CH and DHW motorised valves have opened. 12. Switch the external isolator to ‘ON’. 13. Check power is established – the ATC and BTC should now show display default settings. 14. Set the ATC to automatic using the ‘M’ button, and the display will show the return temperature. 15. Within 30 seconds, the circulating pump will start. 16. Within 30 seconds the fan will start. 17. Within 60 seconds the compressor will start. 18. Once the compressor has started, pay attention to the pressure gauge o...

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