Technical data

32
30
o
C the actual flow temperature out of the heat pump is approximately 35
o
C.
The outlet flow temperature of the heat pump determines the efficiency of the heat pump.
For underfloor systems mounted in screed a flow temperature of 35
o
C is generally suitable, therefore the
return temperature should be set at 30
o
C. However for joisted systems or systems with insulative floor
coverings then a higher flow temperature may be required and hence the return flow temperature set
point may need to be increased.
For radiator systems a flow temperature of 50
o
C is generally required. This means the return flow
temperature set point should be set to approximately 45
o
C
Warning :- Increasing the outlet flow temperature of the heat pump will result in the unit operating at a
lower efficiency with higher fuel bills.
Warning :- for underfloor systems do not increase the outlet flow temperature until the screed that the
underfloor is mounted in is fully dry.
Programming can be carried out on either the upper external controller or the lower controller within
the heat pump.
Changing the flow temperatures is protected by a passcode to prevent unauthorised changes. This pass-
code is 11 and not changeable.
1 For the upper external controller, press and hold SET until 0 is displayed. For the lower controller
within the heat pump, press and hold SEL and PRG together until 0 is displayed.
2 Using the UP arrow increase the displayed number to 11
3 Press SEL (S-P is displayed)
4 Press SEL and -/- is displayed
5 Press the UP arrow until -r- is displayed
6 Press SEL and r01 is displayed
7 Press the UP arrow until r03 is displayed
8 Press SEL
9 The return water temperature setpoint is displayed
10 Press the UP or DOWN arrows to change the setpoint
11 Press SEL
12 Press PRG twice until S-P is displayed
13 Press and hold PRG until the display returns to normal
It is advised that any settings that are changed are noted within Section 8 ‘Heat Pump Settings Sheet’
page 37.