Installation manual
19
EKHBH/X016BB
Indoor unit for air to water heat pump system
4PW62572-1A – 01.2011
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
"5.1. Opening the indoor unit" on page 10
■
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
(1)
.
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.
4
When routing out cables, make sure that these do not obstruct
mounting of the indoor unit cover, see
Note: only relevant field wiring is shown.
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
(c)
(c) Bottom plate heater cable is only applicable in combination with
ERLQ_AA/AB/BA or in case of optional EKBPHT kit. The ERLQ_CA
outdoor unit controls the bottom plate heater internally by the outdoor unit
pcb.
2
(d)
(d) Minimum cable section 0.75 mm
2
4
Power supply cable for backup
heater
2+GND or
3+GND
(e)
(e) See table under
"Connection of the backup heater power supply" on page 20
5
Room thermostat cable
3 or 4
6
3-way valve control cable
2+GND
7
2-way valve control cable
2+GND
8
Booster heater power supply
and thermal protection cable
(f)
(f)
Only applicable for tank with built-in electrical booster heater (EKHW*).
4+GND
9
Thermistor cable
2
(g)
(g) 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
(h)
(h) 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
(i)
(i)
Cable section 0.75 mm
2
till 1.25 mm
2
, maximum length: 500 m.
13
Normal kWh rate power supply
2+GND
CAUTION
Select all cables and wire sizes in accordance with the
applicable legislation.
WARNING
After finishing the electric work, confirm that each electric
part and terminal inside the electric parts box is connected
securely.
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.
(1) Only applicable for tank with built-in electrical booster heater (EKHW*).
X3M
X1M
1 2 3
1
3
2
1
2
3
