Kaisai KHC-22RY3, Инструкция по установке

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9.4.1 Check the water circuit
FHL1 FHL2 FHLn ----
----
9.4 Water piping
All piping lengths and distances have been taken into consideration.
Valve Requirements
Thermistor cable length minus 2m
The maximum allowed thermistor cable length is 20m. This is the maximum
allowable distance between the domestic hot water tank and the unit (only for
installations with a domestic hot water tank).The thermistor cable supplied with
the domestic hot water tank is 10m in length.In order to optimize efficiency we
recommend installing the 3-way valve and the domestic hot water tank as close
as possible to the unit.
8.1
8.2
2 3
6 7
8
9
10
11
17
4
The units are equipped with a water inlet and outlet for connection to a water circuit.
The units should only be connected to closed water circuits. Connection to an open water circuit would lead to excessive
corrosion of the water piping. Only materials complying with all applicable legislation should be used.
Example
：
If the installation is equipped with a domestic hot water tank (field supply), please refer to the domestic hot water tank
Installation And Owner's Manual. If there is no glycol (anti-freeze) in the system there is a power supply or pump failure,
drain the system (as shown in the figure below).
NOTE
If water is not removed from the system in freezing weather when unit is not used. The frozen water may damage the
water circle parts.
NOTE
1
1.5
1.4
1.2
1.3
1.7
1.6
1.1
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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 automat -
ic 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 (models: 8L) that has a default pre-pressure of 1.0 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 . Refer to
14 Technical specifications to find the total internal water volume of the unit.
2) Using the table below, determine if the expansion vessel pre- pressure requires adjustment.
3)
Using the table and instructions below, determine if the total water volume in the installation is below the maximum allowed
water volume.
9.4.2 Water volume and expansion vessel pre-pressure checks
≤
7 m
>7 m
Installation
height
difference(*)
W ater volume
≤
230 L W ater volume >230 L
No pre-pressuread justment required.
Expansion vessel of the unit too small for the
installation.
Actions required:
•
Pre-pressure must be increased, calculate accord -
ing to
"Calculating
the pre-pressure of the expansion
vessel" belo w .
• Check if the water volume is lower than maximum
allowed water volume (use graph below)
Actions required:
•
Pre-pressure must be increased, calculate accord -
ing to
"Calculating
the pre-pressure of the expansion
vessel" belo w .
• Check if the water volume is lower than maxi-
mum allowed water volume (use graph below)
* Height difference is between the highest point of the water circuit and the outdoor unit's expansion tank. Unless the unit is
located at the highest point of the system, in which case the installation height differnce is considered to be zero.
Calculating the pre-pressure of the expansion vessel
The pre-pressure (Pg) to be set depends on the maximum installation height difference (H) and is calculated as follows:
Pg(bar)=(H(m)/10+0.3) bar
Checking the maximum allowed water volume
To determine the maximum allowed water volume in the entire circuit, proceed as follows:
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.
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