The final part of the air con unit was built today and connected to the ducting running under the floor. The heater water coils was mounted inside a mixing chamber which was connected to a low voltage water pump and in turn connected to the hot water supply.
Air heater coil
But switching on the air fan to push air down the ducting to our temporary living quarters and the toilet, did not show any sign of flowing air!! Oops! Where is the blockage? Tomorrow we will have to investigate!