EKHBH/X008BA
Indoor unit for air to water heat pump system
4PW54185-1B
Installation manual
17
Internal wiring - Parts table
Refer to the internal wiring diagram supplied with the unit (on the
inside of the indoor unit switch box cover). The abbreviations used
are listed below.
A1P.................. Main PCB
A2P.................. Digital controller PCB (user interface)
A3P.......... * ..... Thermostat (EKRTW/R) (PC=internal Power Cicuit)
(optional)
A3P.......... * ..... Solar pump station PCB (EKSR3PA) (optional)
A4P.......... * ..... Digital I/O PCB (EKRP1HB) (optional)
A4P.......... * ..... Receiver PCB (EKRTR) (optional)
BSK ......... * ..... Solar pump station relay (EKSR3PA) (optional)
E1H.................. Backup heater element 1
E2H.................. Backup heater element 2
E3H.................. Backup heater element 3
E4H..........# ..... Booster heater (3 kW)
F1B,F3B .......... Fuse backup heater
F2B ..........# ..... Fuse booster heater
F1T .................. Thermal fuse backup heater (250 V, 94°C)
FU1.................. Fuse 3.15 A T 250 V for PCB
FU2.................. Fuse 5 A T 250 V
FuR,FuS .......... Fuse 5 A 250 V for digital I/O PCB
K1M ................. Contactor backup heater step 1
K2M ................. Contactor backup heater step 2
K3M .........# ..... Contactor booster heater
K4M ................. Pump relay
K5M,K6M......... Contactor for backup heater all pole disconnection
M1P..................Pump
M2S....... ## ......2-way valve for cooling mode (field supply)
M3S......... # ......3-way valve: floor heating/domestic hot water
PHC1 ...............Optocoupler input circuit
Q1DI.................Earth leakage circuit breaker (field supply)
Q1L ..................Thermal protector backup heater
Q2L,Q3L . # ......Thermal protector booster heater
R1H..........* ......Humidity sensor (EKRTR) (optional)
R1T ..........* ......Ambient sensor (EKRTW) (optional)
R1T ..................Outlet water heat exchanger thermistor
R2T ..........* ......External sensor (floor or ambient) (EKRTETS)
(optional)
R2T ..................Outlet water backup heater thermistor
R3T ..................Refrigerant liquid side thermistor
R4T ..................Inlet water thermistor
R5T ......... # ......Domestic hot water thermistor
S1L...................Flow switch
S2S ..................Benefit kWh rate power supply contact
S3S ..................Dual set point 2 contact
S4S ..................Dual set point 1 contact
SS1 ..................DIP switch
TR1 ..................Transformer 24 V for PCB
V1S ..................Spark suppression 1
V2S ..................Spark suppression 2
X1M~X9M ........Terminal blocks
Field wiring guidelines
■
Most field wiring on the indoor unit side is to be made on the
terminal block inside the switch box. To gain access to the
terminal block, remove the indoor unit cover and switch box
service panel, see
"Opening the indoor unit" on page 9
■
Cable tie mountings are provided at the bottom of the switch
box. Fix all cables using cable ties (field supply).
■
A dedicated power circuit is required for the backup heater.
■
Installations equipped with a domestic hot water tank (optional),
require a dedicated power circuit for the booster heater.
Please refer to the domestic hot water tank installation manual.
Connection of the indoor unit power supply and
communication cable
Power circuit and cable requirements
Power supply for the indoor unit is to be provided through the outdoor
unit. Data communication with the outdoor unit is provided through
the same cable.
For all guidelines and specifications regarding field wiring between
the indoor unit and the outdoor unit, please refer to the outdoor unit
installation manual.
Procedure
1
Using the appropriate cable, connect the power circuit to the
appropriate terminals as shown on the wiring diagram and the
illustration below.
2
Connect the earth conductor (yellow/green) to the earthing
screw on the switch box mounting plate.
3
Fix the cable with cable ties to the cable tie mountings to ensure
strain relief.
Item
Description
Required
number of
conductors
Maximum
running current
1
Power supply cable for outdoor
unit
2+GND
(a)
(a) Refer to nameplate on outdoor unit.
2
Indoor unit power supply and
communication cable
3+GND
(b)
(b) Cable section 2.5 mm
2
3
Power cable for bottom plate
heater
2
(c)
(c) Minimum cable section 0.75 mm
2
4
Power supply cable for backup
heater
2+GND or
3+GND
(d)
(d) See table under
"Connection of the backup heater power supply" on page 18
5
Room thermostat cable
3 or 4
100 mA
6
3-way valve control cable
2+GND
100 mA
7
2-way valve control cable
2+GND
100 mA
8
Booster heater power supply
and thermal protection cable
4+GND
9
Thermistor cable
2
(e)
(e) The thermistor and connection wire (12 m) are delivered with the domestic hot
water tank.
10
Booster heater power supply
cable
2+GND
13 A
11
Benefit kWh rate power supply
cable (voltage free contact)
2
(f)
(f)
Cable section 0.75 mm
2
till 1.25 mm
2
, maximum length: 50 m.
Voltage free contact shall ensure the minimum applicable load of 15 V DC,
10 mA.
12
User interface cable
2
(g)
(g) Cable section 0.75 mm
2
till 1.25 mm
2
, maximum length: 500 m.
CAUTION
Select all cables and wire sizes in accordance with
relevant local and national regulations.
WARNING
After finishing the electric work, confirm that each electric
part and terminal inside the electric parts box is connected
securely.
*
Optional
#
Applications with domestic hot water tank only
##
Heating/cooling applications only
WARNING
Switch off all power supply – i.e. outdoor unit power
supply and backup heater and domestic hot water
tank power supply (if applicable) – before removing
the switch box service panel.
