Manual Kaysun KEM-14 DTN (page 24 of 48) (English)

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■ Never squeeze bundled cables and make sure they do 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 a ground. Do not ground the unit to

a utility pipe, surge protector, or telephone ground.

Incomplete grounding may cause electrical shock.

5.6.3

Electrical connection

The unitary mini chillers leave the factory already wired, and require

the installation of an omni polar thermal overload switch, a lockable

main disconnecting switch for the connection to the mains power

supply, and the connection of the flow switch to the corresponding

terminals. All the above operations must be carried out by qualified

personnel in compliance with the legislation in force.

For all electrical work, refer to the electrical wiring diagrams in this

manual. You are also recommended to check that the characteristics

of the mains electricity supply are adequate for the absorptions

indicated in the electrical characteristics table below, also bearing in

mind the possible use of other equipment at the same time.

■ Be sure to install a ground fault circuit interrupter (30 mA).

Failure to do so may cause electrical shock.

■ Be sure to install the required fuses or circuit breakers.

5.6.1

Precautions on electrical wiring work

■ Fix cables so that cables do not contact the pipes

(especially on the high-pressure side).

■ Secure the electrical wiring with cable ties as shown in figure

so that it does not contact the piping, particularly on the high-

pressure side.

■ Make sure no external pressure is applied to the terminal

connectors.

■ When installing the ground fault circuit interrupter make sure

that it is compatible with the inverter (resistant to high frequency

electrical noise) to avoid unnecessary opening of the ground fault

circuit interrupter.

NOTE

The ground fault circuit interrupter must be a high- speed

type breaker of 30 mA (<0.1 s).

■ This unit is equipped with an inverter. Installing a phase advancing

capacitor not only will reduce the power factor improvement effect,

but also may cause abnormal heating of the capacitor due to high-

frequency waves. Never install a phase advancing capacitor as it

could lead to an accident.

5.6.2

Precautions on wiring of power supply

■ Use a round crimp-style terminal for connection to the power

supply terminal board. In case it cannot be used due to unavoidable

reasons, be sure to observe the following instructions.

- Do not connect different gauge wires to the same power supply

terminal. (Loose connections may cause overheating.)

- When connecting wires of the same gauge, connect them

according to the figure below.

■ Use the correct screwdriver to tighten the terminal screws.

Small screwdrivers can damage the screw head and prevent

appropriate tightening.

Over-tightening the terminal screws can damage the screws.

■ Attach a ground fault circuit interrupter and fuse to the power

IMPORTANT

• Power to the unit must be turned on only after installation work

(hydraulic and electrical) has been completed.

• All electrical connections must be carried out by qualified

personnel in accordance with legislation in force in the country

concerned.

• Respect instructions for connecting phase, neutral and earth

conductors.

• The power line should be fitted upstream with a suitable device to

protect against short-circuits and leakage to earth, isolating the

installation from other equipment.

• Voltage must be within a tolerance of ±10% of the rated power

supply voltage for the unit (for three phase units, the unbalance

between the phases must not exceed 3%).If these parameters are

not respected, contact the electricity supply company.

• For electrical connections, use double insulation cable in

conformity with current legislation in the country concerned.

• An omnipolar thermal overload switch and a lockable main

disconnecting switch, in compliance with the CEI-EN standards

(contact opening of at least 3mm), with adequate switching and

residual current protection capacity based on the electrical data

table shown below, must be installed as near as possible to the

appliance.

• The devices on the unit must be lockable. An efficient earth

connection is obligatory. Failure to earth the appliance absolves

the manufacturer of all liability for damage.

• Do not use water pipes to earth the unit.

Customer connection terminal

5kW/7kW (1-phase)

PUMP2 R e mote alarm Re mot e s hutdown Re mote co oling/hea ting wire cont rolle r

10kW/12kW (1-phase)

PUMP2 Remote alarm Remote shutdown Remote cooling/heating wire controller

12kW/14kW/16kW (3-phase)

supply line.

In wiring, make certain that prescribed wires are used, carry out

A B

N GND

6 7

10 11

complete connections and fix the wires so that outside force can

not affect the terminals.

PUMP2 Remote alarm Remote shutdown Remote cooling/heating wire controller

L N

GND

3 4

10 11

3 4

6 7

10 11

L N GND

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Kaysun KEM-14 DTN Manual

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