RKBW1
Heater kit for air to water heat pump system
4PW58904-1
Installation and operation manual
6
Cable requirements
Refer to the chapter "Field wiring" of the RKHBRD indoor unit
installation manual for details where to use high voltage (HV) and low
voltage (LV) cables.
Internal wiring - Parts table
Refer to the internal wiring diagram supplied with the heater kit (on
the inside of the heater kit). The abbreviations used are listed below.
Procedure
Connections to be made in the heater kit
1
Using the appropriate cable, connect the power supply cable
and communication cables to the appropriate terminals.
Refer to the wiring diagram sticker on the inside of the heater kit
front panel.
2
Fix the cables with the cable ties inside the heater kit.
Make sure to ensure strain relief of the cable by correct use of
the PG nipples and nut (provided with the accessory bag).
Connections to be made in the RKHBRD indoor unit switch box
For details on connecting signals to the indoor unit refer to the
chapters "Overview of the indoor unit" and "Electrical wiring work" of
the indoor unit installation manual.
1
Connect the indoor unit control signal to X2M 14, 15, 16.
2
Connect the heater kit error feedback signal to X801M 2, 5 of the
demand PCB.
Item
Cable
bundle
Description
Required number of
conductors
Maximum
running
current
1~
3N~
1
PS
Power supply
2 + GND
4 + GND
(a)
(a) Refer to the nameplate of the heater kit
2
HV
Indoor unit
control signal
(High Voltage)
3
3
(b)
(b) Minimum cable section is 0.75 mm
2
3
LV
Heater kit error
feedback signal
(Low Voltage)
2
2
(b)
CAUTION
Select all cables and wire sizes in accordance with
relevant local and national regulations.
Part number
Description
A8P
#
RKRP1AHTA demand PCB (Indoor unit option)
E1H, E2H,
E3H
Backup heater elements
F1B, F2B
Fuse backup heater (20 A 400 V)
F1U
Fuse (5 A T 250 V)
F1T
Thermal fuse backup heater
K1A
Time relay (on-delay)
K2A
Auxiliary relay
K1M, K2M
Contactor backup heater step
K5M, K6M
Contactor for backup heater (all pole disconnection)
S1L
Flow switch
Q1DI
#
Earth leakage protector
Q1L
Thermal protector backup heater (manual reset)
Q2L
Thermal protector inlet water (automatic reset)
R1
Inline resistor for flow switch
X1M, X2M
Terminal strip
X801M
PCB terminal strip
#
Field supply
Use a dedicated power circuit for the heater kit. Never
use a power circuit shared by another appliance.
NOTE
The heater kit needs to be connected to a normal
power supply. Connecting the heater kit to a
benefit kWh rate power supply can result in errors
between the heater kit and indoor unit. For details
on benefit kWh rate power supplies, refer to the
indoor unit installation manual.
NOTE
The electrical connection diagram can be found
on the inside of the switch box cover.
NOTE
To connect the heater kit to the indoor unit, the
RKRP1AHTA PCB (demand PCB) must be installed in
the indoor unit switch box. This is an optional PCB for
the indoor unit and not included with the heater kit.
NOTE
Only relevant wiring is shown.
4PW58904-1_offset.book Page 6 Monday, February 22, 2010 9:59 AM
