Installation manual
12
RKHBH/X016AB
Indoor unit for air to water heat pump system
4PW50205-1A
Overview
The illustration below gives an overview of the required field wiring
between several parts of the installation. Refer also to "Typical
application examples" on page 3.
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.................. Remote controller PCB (user interface)
A3P.................. Thermostat (field supply, PC= internal Power Circuit)
A4P.......... * ..... Remote alarm address card
E1H.................. Backup heater element 1
E2H.................. Backup heater element 2
E3H.................. Backup heater element 3
E4H..........# ..... Booster heater
F1B .................. Fuse backup heater
F2B ..........# ..... Fuse booster heater
F1T .................. Thermal fuse (250 V, 94°C)
FU1.................. Fuse 3.15 A T 250 V
FU2.................. Fuse 5 A T 250 V
FuR,FuS .......... Fuse 5 A 250 V for remote alarm PCB
K1M ................. Contactor backup heater step 1
K2M ................. Contactor backup heater step 2
K3M .........# ..... Contactor booster heater
K4M ................. Pump relay
K5M ................. Contactor for backup heater all pole disconnection
M1P ................. Pump
M2S .......## ..... 2-way valve for cooling mode
M3S .........# ..... 3-way valve: floor heating/domestic hot water
PHC1 ............... Optocoupler input circuit
Q1DI ................ Earth leakage protector
Q1L.................. Thermal protector backup heater
Q2L,Q3L ..# ..... Thermal protector booster heater
R1T.................. Outlet water heat exchanger thermistor
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
SS1.................. DIP switch
TR1.................. Transformer 24 V for PCB
V1S.................. Spark suppression 1
V2S.................. Spark suppression 2
X1M-X4M......... 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 5.
■
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.
A
Single power supply for
outdoor unit, backup
heater and booster
heater
F
3-way valve for domestic
hot water tank (field
supply, optional)
G
2-way valve for cooling
mode (field supply,
optional)
B
Outdoor unit
C
Backup heater
H
Domestic hot water tank
(optional)
D
Indoor unit
E
Room thermostat (field
supply, optional)
I
Booster heater
(optional)
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 supply cable for backup
heater
2+GND or
3+GND
(c)
(c) See table under "Connection of the backup heater power supply" on page 13.
4
Room thermostat cable
3 or 4
100 mA
(d)
(d) Minimum cable section 0.75 mm
2
5
3-way valve control cable
2+GND
100 mA
(d)
6
2-way valve control cable
2+GND
100 mA
(d)
7
Booster heater power supply
and thermal protection cable
4+GND
(b)
8
Thermistor cable
2
(e)
(e) The thermistor and connection wire (12 m) are delivered with the domestic hot
water tank.
9
Booster heater power supply
cable
2+GND
13 A
10
Benefit kWh rate power supply
cable (voltage free contact)
2
100 mA
(d)
T
M
M
2
B
1
3
4
C
5
6
7
8
D
A
9
10
E
H
I
G
F
*
Optional
#
Applications with domestic hot water tank only
##
Heating/cooling applications only
1D_IM_4PW50205-1A.book Page 12 Thursday, January 29, 2009 12:00 PM
