EKHBH/X016BB
Indoor unit for air to water heat pump system
4PW62572-1A – 01.2011
Installation manual
18
7.2.
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........................ User interface PCB
A3P................ * ..... Thermostat (EKRTW/R) (PC=Power Circuit)
(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)
(1)
F1B,F3B ................ Fuse backup heater
F2B ............ ### ..... Fuse booster heater
(2)
F1T ........................ Thermal fuse backup heater (250 V, 100°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
(3)
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,Q2DI............. 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 (EKRTR and 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
X6Y,X9B ................ Connector
7.3.
System overview of field wiring
The illustration below gives an overview of the required field wiring
between several parts of the installation. Refer also to
application examples" on page 4
A
Single power supply for outdoor unit, backup heater and
booster heater
B
Outdoor unit
C
Bottom plate heater
D
Backup heater
(4)
E
Indoor unit
F
Room thermostat (optional)
G
3-way valve for domestic hot water tank (optional)
H
2-way valve for cooling mode (field supply)
I
Domestic hot water tank (optional)
J
Booster heater
(5)
K
User interface (digital controller)
L
Power supply (normal kWh rate power supply: only in case
of benefit kWh rate power supply installation)
(1) Only applicable for tank with built-in electrical booster heater (EKHW*).
(2) Only applicable for tank with built-in electrical booster heater (EKHW*).
(3) Only applicable for tank with built-in electrical booster heater (EKHW*).
*
Optional
#
Applications with domestic hot water tank only.
##
Heating/cooling applications only
###
Delivered with the domestic hot water tank
(a)
.
(a) Only applicable for tank with built-in electrical booster heater
(EKHW*).
WARNING
■
Switch off the power supply before making any
connections.
■
All field wiring and components must be installed by a
licensed electrician and must comply with the
applicable legislation.
(4) For tank without electrical booster heater (EKHTS), the backup heater will
be used in domestic water heating mode.
(5) Only applicable for tank with built-in electrical booster heater (EKHW*).
T
I
M
M
B
D
2
6
12
7
8 9
E
A
L
3
F
K
I
C
J
H
G
1
10
11
13
4
5
