Kaisai KMK-60RY1, Руководство по установке

Страница: 104 / 148

27
The maximum water pressure ≤ 3 bar.
The maximum water temperature ≤ 70°C according to safety device setting.
Always use materials that are compatible with the water used in the system and with the materials used in the unit.
Ensure that components installed in the field piping can withstand the water pressure and temperature.
Drain taps must be provided at all low points of the system to permit complete drainage of the circuit during maintenance.
Air vents must be provided at all high points of the system. The vents should be located at points that are easily accessible
for service. An automatic air purge is provided inside the unit. Check that this air purge valve is not tightened so that
automatic release of air in the water circuit is possible.
Before continuing installation of the unit, check the following:
The units are equipped with an expansion vessel of 8L that has a default pre-pressure of 1.5 bar. To assure proper operation
of the unit, the pre-pressure of the expansion vessel might need to be adjusted.
1) Check that the total water volume in the installation, excluding the internal water volume of the unit, is at least 40L. See 13
"Technical specifications" to find the total internal water volume of the unit.
The expansion vessel volume can follow the figure below:
2) Expansion vessel volume must fit the total water system volume.
3) To size the expansion for the heating and cooling circuit.
8.5.2 Water volume and sizing expansion vessels
NOTE
In most applications this minimum water volume will be satisfactory.
In critical processes or in rooms with a high heat load though, extra water might be required.
When circulation in each space heating loop is controlled by remotely controlled valves, it is important that this
minimum water volume is kept even if all the valves are closed.
0
5
10
15
20
25
0 50 100 150 200 250 300 350 400
Ex
pa
ns
io
n
ve
ss
el
(L
)
System water volume (L)
28
8.5.4 Water circuit anti-freeze protection
All internal hydronic parts are insulated to reduce heat loss. Insulation must also be added to the field piping.
The software contains special functions using the heat pump and backup heater (if it is aviliable) to protect the entire system against
freezing. When the temperature of the water flow in the system drops to a certain value, the unit will heat the water, either using the heat
pump, the electric heating tap, or the backup heater. The freeze protection function will turn off only when the temperature increases to a
certain value.
In event of a power failure, the above features would not protect the unit from freezing.
Be careful not to deform the unit’s piping by using excessive force when connecting the piping. Deforming the piping can cause the
unit to malfunction.
CAUTION
8.5.3 Water circuit connection
Water connections must be made correctly in accordance with labels on the indoor unit, with respect to the water inlet and water outlet.
Use clean pipes only.
Hold the pipe end downwards when removing burrs.
Cover the pipe end when inserting it through a wall to prevent dust and dirt entering.
Use a good thread sealant for sealing the connections. The sealing must be able to withstand the pressures and temperatures of the
system.
When using non-copper metallic piping, be sure to insulate two kind of materials from each other to prevent galvanic corrosion.
If air, moisture or dust gets in the water circuit, problems may occur. Therefore, always take into account the following when connecting
the water circuit:
As copper is a soft material, use appropriate tools for connecting the water circuit. Inappropriate tools will cause damage to the pipes.
NOTE
Never use Zn-coated parts in the water circuit. Excessive corrosion of these parts may occur as copper piping is used in the
unit's internal water circuit.
When using a 3-way valve in the water circuit. Preferably choose a ball type 3-way valve to guarantee full separation between
the domestic hot water and floor heating water circuit.
When using a 3-way valve or a 2-way valve in the water circuit. The recommended maximum changeover time of the valve
should be less than 60 seconds.
The unit is only to be used in a closed water system. Application in an open water circuit can lead to excessive corrosion of the
water piping:
When the unit is not running for a long time,make sure the unit is powered on all the time,if you want to cut off the power,the water
in the system pipe needs to be drained clean,avoid the pump and pipeline system be damaged by freezing.Also the power of the
unit needs to be cut off after water in the system is drained clean.
CAUTION
105 104