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Field wiring
WARNING
A main switch or other means for disconnection,
having a contact separation in all poles, must be
incorporated in the fixed wiring in accordance with
relevant local laws and regulations.
Switch off the power supply before making any
connections.
Use only copper conductors.
Never squeeze bundled cables and make sure that it
does not come in contact with the piping and sharp
edges.
Make sure no external pressure is applied to the
terminal connections.
All field wiring and components must be installed by a
licensed electrician and must comply with relevant
local laws and regulations.
The field wiring must be carried out in accordance
with the wiring diagram supplied with the unit and the
instructions given below.
Be sure to use a dedicated power supply. Never use a
power supply shared by another appliance.
Be sure to establish an ground. Do not ground the unit
to a utility pipe, surge absorber, or telephone ground.
Incomplete ground may cause electrical shock.
Be sure to install an ground fault circuit interrupter
(30 mA) in accordance with relevant local laws and
regulations. Failure to do so may cause electrical
shock or fire.
Be sure to install the required fuses or circuit
breakers.
EKHBH/X030BA
Indoor unit for air to water heat pump system
4PW62568-1 – 07.2010
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 4.
5
B
D
E
2
C
3
1
4
A
11
10
A
Single power supply for
outdoor unit, backup
heater and booster
heater
B
Outdoor unit
C
Bottom plate heater
D
Backup heater
E
Indoor unit
F
Room thermostat
(optional)
Item
Description
1
Power supply cable for outdoor
unit
2
Indoor unit power supply and
communication cable
3
Power cable for bottom plate
heater
4
Power supply cable for backup
heater
5
Room thermostat cable
6
3-way valve control cable
7
2-way valve control cable
8
Booster heater power supply
and thermal protection cable
9
Thermistor cable
10
Booster heater power supply
cable
11
Benefit kWh rate power supply
cable (voltage free contact)
12
User interface cable
(a) Refer to nameplate on outdoor unit.
2
(b) Cable section AWG13 (2.5 mm
(c) Minimum cable section AWG18 (0.75 mm
(d) See table under "Connection of the backup heater power supply" on page 19.
(e) Minimum cable section AWG18 (0.75 mm
(f)
The thermistor and connection wire (39.4 ft)(12 m) are delivered with the
domestic hot water tank.
(g) Cable section AWG18 till AWG16 (0.75~1.25 mm
(50 m).
Voltage free contact shall ensure the minimum applicable load of 15 V DC,
10 mA.
(h) Cable section AWG18 till AWG16 (0.75~1.25 mm
(500 m).
CAUTION
Select all cables and wire sizes in accordance with
relevant local laws and regulations.
T
F
I
K
6
G
M
7
H
M
I
8
J
9
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
(optional)
K
User interface (digital
controller)
Required
number of
Maximum
conductors
running current
(a)
2+GND
(b)
3+GND
(c)
2
(d)
2+GND or
3+GND
(e)
3 or 4
100 mA
(e)
2+GND
100 mA
(e)
2+GND
100 mA
(b)
4+GND
(f)
2
2+GND
13 A
2
(g)
2
(h)
)
2
)
2
)
2
), maximum length: 164 ft
2
), maximum length: 1640 ft
Installation manual
17
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