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4
Installation
Filling the System (Primary Circuit)
1. Check and charge expansion vessel.
2. Check all connections including factory fitted ones are tight.
3. Insulate pipework between cylinder unit and outdoor unit.
4. Thoroughly clean and flush, system of all debris. (see section 4.2 for instruction.)
5. Fill cylinder unit with potable water. Fill primary heating circuit with water and
suitable anti-freeze and inhibitor as necessary. Always use a filling loop with
double check valve when filling the primary circuit to avoid back flow
contamination of water supply.
• Anti-freeze should always be used for packaged model systems (see
section 4.2 for instruction). It is the responsibility of the installer to decide
if anti-freeze solution should be used in split model systems depending
on each site's conditions. Corrosion inhibitor should be used in both split
model and packaged model systems.
Figure 4.3.2 shows freezing temperature against anti-freeze concentration.
This figure is an example for FERNOX ALPHI-11. For other anti-freeze,
please refer to relevant manual.
• When connecting metal pipes of different materials insulate the joints to
prevent a corrosive reaction taking place which will damage the pipework.
Sizing Expansion Vessels
Expansion vessel volume must fit the local system water volume.
To size an expansion vessel for the heating circuit the following formula and
graph can be used.
When the necessary expansion vessel volume exceeds the volume of an built-in
expansion vessel, install an additional expansion vessel so that the sum of the
volumes of the expansion vessels exceeds the necessary expansion vessel
volume.
* For installation of an E*ST20*-*M*EC model, provide and install an expansion
vessel in the field as the model does not come fitted with an expansion vessel.
Where;
ε × G
V : Necessary expansion vessel volume [L]
V =
P ¹ + 0.098
1 −
ε
P ² + 0.098
G : Total volume of water in the system [L]
P ¹ : Expansion vessel setting pressure [MPa]
P ² : Max. pressure during operation [MPa]
Graph to the right is for the following values
ε
P ¹ : 0.1 MPa
P ² : 0.3 MPa
*A 30% safety margin has been added.
Water Circulation Pump Characteristics
Pump speed can be selected by main remote controller setting (see <Figure 4.3.4>).
Adjust the pump speed setting so that the flow rate in the primary circuit is appropri-
ate for the outdoor unit installed (see Table 4.3.1). It may be necessary to add an
additional pump to the system depending on the length and lift of the primary circuit.
<Second pump >
If a second pump is required for the installation, please read the following care-
fully.
If the second pump has current greater than 1A, please
use appropriate relay.
If the second pump is being used for the heating circuit only, then the signal cable
should be wired to TBO.1 terminals 3 and 4 (OUT2).
Pump signal cable can either be wired to TBO.1 1-2 or CNP1 but NOT both.
: Water expansion coefficient
: at 70 °C = 0.0229
6. Check for leakages. If leakage is found, retighten the nut onto the connections.
7. Pressurise system to 1 bar.
8. Release all trapped air using air vents during and following heating period.
9. Top up with water as necessary. (If pressure is below 1 bar)
5
0
-5
-10
-15
-20
-25
0
10
20
Anti-freeze concentration [%]
<Figure 4.3.2>
Expansion vessel sizing
25
20
15
10
5
0
0
50
100
150
System water volume [L]
<Figure 4.3.3>
Outdoor heat pump unit
Split model
MXZ-8C112VAM-CN1
MXZ-8C140VAM-CN1
MXZ-8C160VAM-CN1
<Table 4.3.1>
* If the water flow rate is less than 17.9 L/min, the flow rate error will be activated.
If the water flow rate exceeds 35.8 L/min, the flow speed will be greater than 2.0 m/s,
which could erode the pipes.
Water Circulation Pump Characteristics
EHSC-VM6D-CN
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0
5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0
Flow rate [L/min]
<Figure 4.3.4>
30
40
50
200
250
300
350
400
Water flow rate range [L/min]
17.9-35.8
17.9-35.8
17.9-35.8
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
10
en
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