Heat Pump User Manual

Fault Finding
37
13.2 General Notes
1. If no continuity can be found
between terminals 1 & 2 and/or 1
& 3 there will be a fault within the
heating s-plan system. (see diagram
for location of the terminals.)
2. Please go back to your design of
the S-plan wiring and check it
against the installation manual.
In detail, trace the demand for CH
and DHW in isolation, covering the
programmer, room or cylinder
thermostats, motorised valves and
end switches. Make sure that when
the end switches of the motorised
valves make, that there is no
voltage present. Voltage on these
wires will do irreparable damage to
the heat pump and will not be
covered by the warranty.
3. WWSD (warm weather shut down)
happens only under 2 conditions.
1 – when the ambient air
temperature is at 24˚C or equal to
the indoor temperature and 2 –
when the CH is the only demand on
the heat pump. WWSD is active
when WWSD appears on the
display of the BTC.
4. MCB’s and RCD can trip for a
variety of reasons. Here are some
common explanations but
remember only qualified electricians
can work on power installations.
If you are in any doubt, call an
electrician – not our helpline – we
will only direct you to call an
electrician.
a) Incorrect rating or type of
MCB/RCD
b) A component leaking to earth
c) A component with a dead short
d) Incorrect polarity
e) Incorrect cable size
f) Damaged cable or component
Figure 13-1: Heat pump wiring diagram
230 Vac
Compressor
Heater
4-way
valve
Expansion Valve
Disconnect
Electric Element
for Bivalent
Switched Output
For diagram of 6kW immersion
heater refer to Figure 8-9.
Ret Gas Sensor
Ext Temp Sensor
Coil Temp Sensor
Dis Gas Sensor
Ret Temp Sensor
N
Compressor
Fan
motor
Pump
Relay
KM2
3kW
Electric
Element
Orange
Red
Blue
White
Blk
Power Supply
Terminal
3 Connection points for installer
ATC Controller
Socket
S-Plan Controls
Connections
3 2 1
3 2 1
12
11
10
9
8
7
6
5
4
3
2
1
24
23
22
21
20
19
18
17
16
15
14
13
C
R
S
24 Vac
Fuse
Relay KM1
Low pressure switch High pressure switch