To Change The Heat Pump Return Flow Temperatures - Kensa Group Kensa Heat Pumps P250X Manual

A flashing error code may appear if there is a fault with the heat pump, the most common will be: -
Alarm
TP Low water pressure (ground or heating distribution)
HP High gas pressure caused by low or no flow on the heating distribution circuit.
LP Low gas pressure fault (can occur temporarily on first start up). Call Kensa Technical
Department.
A1 Anti freeze alarm, ground getting to cold / insufficient anti freeze/ unit not
commissioned correctly/ low flow around ground arrays.
(See Fault Finding Section 6 for further details)

5.4.1 To change the heat pump return flow temperatures.

Heat pumps are generally controlled on the return temperature from the heating distribution system and
work on a temperature differential of approximately 5 degrees, i.e. if the return temperature set point is
o
30 C the actual flow temperature out of the heat pump is approximately 35
temperatures should be taken from the heat emitter design.
The outlet flow temperature of the heat pump determines the efficiency of the heat pump and should be
detailed by the heating system designer. The return temperature should be set 4-5oC below this value.
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.
Changing the flow temperatures is protected by a passcode to prevent unauthorised changes. This
passcode is 11 and not changeable.
1 On the 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
Plant Room Heat Pump Manual Version 11.1
Page 26 of 34
Description
o
C. However in the actual