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7.7.8
To insulate the water piping
The piping in the complete water circuit MUST be insulated to
prevent condensation during cooling operation and reduction of the
heating and cooling capacity.
To prevent the freezing of the outdoor water piping during winter
time, the thickness of the sealing material MUST be at least 13 mm
(with λ=0.039 W/mK).
If the temperature is higher than 30°C and the humidity is higher
than RH 80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
During winter, protect the water piping and shut‑off valves against
freezing by adding heat tape (field supply). If the outdoor
temperature can drop below –20°C and no heat tape is used, it is
recommended to install the shut‑off valves indoors.
7.8
Connecting the electrical wiring
7.8.1
About connecting the electrical wiring
Before connecting the electrical wiring
Make sure the water piping is connected.
Typical workflow
Connecting the electrical wiring typically consists of the following
stages:
1
Making sure the power supply system complies with the
electrical specifications of the units.
2
Connecting the electrical wiring to the outdoor unit (if
applicable).
3
Connecting the electrical wiring to control box EKCB07CAV3 (if
applicable).
4
Connecting the electrical wiring to option box EK2CB07CAV3 (if
applicable).
5
Connecting the electrical wiring to the backup heater (if
applicable).
6
Connecting the main power supply
7
Connecting the backup heater power supply (if applicable).
8
Connecting the user interface.
9
Connecting the shut–off valves (if applicable).
10 Connecting the electrical meters (if applicable).
11 Connecting the alarm output (if applicable).
12 Connecting the space cooling/heating ON/OFF output (if
applicable).
13 Connecting the changeover to an external heat source (if
applicable).
14 Connecting the power consumption digital inputs (if applicable).
7.8.2
Precautions when connecting the
electrical wiring
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
DANGER: RISK OF ELECTROCUTION
WARNING
ALWAYS use multicore cable for power supply cables.
EWAQ+EWYQ004+005BAVP
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492900-1 – 2017.06
7.8.3
Guidelines when connecting the electrical
wiring
Keep the following in mind:
▪ If stranded conductor wires are used, install a round crimp-style
terminal on the end of the wire. Place the round crimp-style
terminal on the wire up to the covered part and fasten the terminal
with the appropriate tool.
b
a
a
Stranded conductor wire
b
Round crimp-style terminal
▪ Use the following methods for installing wires:
Wire type
Single-core wire
A
a Curled single-core wire
b Screw
c Flat washer
c b
Stranded conductor
wire with round
crimp-style terminal
a Terminal
b Screw
c Flat washer
O Allowed
X Not allowed
Item
Outdoor unit
X3M
X4M
X5M
X7M
Control box / option box
X1M
X2M
X4M
X8M
Backup heater
X15M
7.8.4
To connect the electrical wiring on the
outdoor unit
1 Remove the switch box cover. See
unit" on
page 28.
2 Strip insulation (20 mm) from the wires.
7 Installation
Installation method
c b
AA´
A´
c
a
a
a
b
c
B
B
a
Tightening torque (N•m)
0.8~0.9
2.2~2.7
0.8~0.9
2.2~2.7
0.8~0.9
1.3~1.6
0.8~0.9
0.8~0.9
"7.2.2 To open the outdoor
Installer reference guide
37
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