SAHP BMTB 130 - Page 20

20| SAHP - BMTB Installation Manual
V1 Mar 2019US - SD667052
ELECTRICAL
INSTALLATION continued
SECTION 6
!
PV
connectivity
6.6 Toreplacetheimmersionrstdissconnectthepowersupplyand 
drain the tank. disconnect the immersion wiring before unscrewing
the immersion heater. Screw in the new immersion heater - reconnect
 thewiring,rellthetankandreconnecttheelectricalsupply.
6.7 Correct wire sizing must be carried out based on the power, wire
length and wire enclosures however in most domestic applications
 14gaugewireissuitable.Heatresistancesheathedexcomplying 
to relevant local and national standards should be used.
6.8 Do not energize the immersion heater until the cylinder has been
 ushedandlledwithwaterasthiswillcausedamagetotheelement.
6.9 Do not operate the immersion heater if any cleaning agents are in the
cylinder as this will also cause premature failure of the immersion element.
6.10 The BMTB Thermodynamic Heat Pump ‘Blueberry’ controller has
the functionality to connect to a Solar PV PV inverter system. If you are
not connecting the BMTB to a PV Inverter proceed to section 7.
6.11 To connect the BMTB to a PV inverter a 2 conductor wire is required.
There is no maximum or minimum distance requirements of this 2
conductor wire. The cable will be carrying a voltage free signal.
6.12 Connectthe2corecabletotheunoccupiedterminals5and8 
as per the wiring diagram, located on the BMTB Blueberry
controller sensor terminal located on the top right hand side of
the back of the controller. Connect the other end of the two core
 cabletoaN/OrelayofthePVinverter.
6.13 IncaseswhereaN/Orelayisnotavailablewithintheinverter,
the controller can be connected via a 2 conductor voltage free
wire to an independent 7 days timer instead which allows the
controllertobeautomaticallyactuatedatapredenedrangeof  
hours which can correspond to the assumed maximum PV energy
generation.
6.14 WhenthePVinvertergenerateselectricity,theN/Orelaywill 
close, which will subsequently signal the Blueberry controller to
enter Eco Mode, a programme in which BMTB will automatically
raise the set point temperature input of the controller of the water
within the connected cylinder to 140°F and re initiate heating
again once the water temperature falls below 135°F.