Kaisai MONO KHC-22RX3 Installation Manual Download Page 114

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Also refer to "

10.3 Pre-operation checks/Checks

before initial start-up

Connect the water supply to the fill valve and open the valve.
Make sure the automatic air purge valve is open (at least 2 turns).
Fill with water until the manometer indicates a pressure of approximately 2.0 bar. Remove air in the circuit as much as

possible using the air purge valves. Air in the water circuit could lead to malfunction of the backup electric heater.

9.5 Adding water

Do not fasten the black plastic

cover on the vent valve at the

topside of the unit when the

system is running. Open air

purge valve, turn anticlockWise

at least 2 full turns to release air

from the system.

▪ Protection against bursting: the glycol will prevent

the piping from bursting, but NOT the liquid inside the

piping from freezing.

▪ Protection against freezing: the glycol will prevent

the liquid inside the piping from freezing.

INFORMATION

▪ The required concentration might differ depending

on the type of glycol. ALWAYS compare the

requirements from the table above with the specifica-

tions provided by the glycol manufacturer. If

necessary, meet the requirements set by the glycol

manufacturer.

▪ If the liquid in the system is frozen, the pump will

NOT be able to start. Mind that if you only prevent

the system from bursting, the liquid inside might still

freeze.

▪ When water is at standstill inside the system, the

system is very likely to freeze and get damaged.

NOTE

2. Freeze protection by freeze protection

valves

About freeze protection valves

When no glycol is added to the water, you can use

freeze protection valves to drain the water from the

system before it can freeze.

▪

Install freeze protection valves (field supply) at all

lowest points of the field piping.

Normally closed valves (located indoors near the

piping entry/exit points) can prevent that all water

from indoor piping is drained when the freeze

protection valves open.

▪

NOTE

Water may enter into the flow switch and

cannot be drained out and may freeze when

the temperature is low enough. The flow switch

should be removed and dried, then can be

reinstalled in the unit.

Counterclock Wise rotation, remove the flow

switch.

Drying the flow switch completely.

Keep dry

A main switch or other means of 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 wires. 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.
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.

WARNING

9.7.2 Wiring overview

The ground fault circuit interrupter must be a high- speed type breaker of 30 mA (<0.1 s).

NOTE

This unit is equipped with an inverter. Installing a phase advancing capacitor not only will reduce the power factor improve-

ment 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.

The illustration below gives an overview of the required field wiring between several parts of the installation. Refer also to "8

Typical application examples".

Secure the electrical wiring with cable ties as shown in figure so that it does not come in contact with 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.

Fix cables so that cables do not make contact with the pipes (especially on the high pressure side).

9.7.1 Precautions on electrical wiring work

9.6 Water piping insulation

9.7 Field wiring

The complete water circuit including all piping, water piping must be insulated to prevent condensation during cooling operation

and reduction of the heating and cooling capacity as well as prevention of freezing of the outside water piping during winter. The

insulation material should at least of B1 fire resistance rating and complies with all applicable legislation. The thickness of the

sealing materials must be at least 13 mm with thermal conductivity 0.039 W/mK in order to prevent freezing on the outside water

piping.
If the outdoor ambient temperature is higher than 30°C and the humidity is higher than RH 80%, then the thickness of the

sealing materials should be at least 20 mm in order to avoid condensation on the surface of the seal.

NOTE

During filling, it might not be possible to remove all air in the system. Remaining air will be removed through the

automatic air purge valves during the first operating hours of the system. Topping up the water afterwards might be

required.

The water pressure indicated on the manometer will vary depending on the water temperature (higher pressure at

higher water temperature). However, at all times water pressure should remain above 0.3 bar to avoid air entering

the circuit.
The unit might drain-off too much water through the pressure relief valve.
Water quality should be complied with EN 98/83 EC Directives.
Detailed water quality condition can be found in EN 98/83 EC Directives.

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