Mitsubishi Electric EHSD-MEC Installation Manual page 14

4
Installation
Drain Pipework (ONLY ERSC and ERSD series)
The drain pipe should be installed to drain condensing water in Cooling mode.
• Securely install the drain pipe to prevent leakage from the connection.
• Securely insulate the drain pipe to prevent water dripping from the locally supplied
drain pipe.
• Install the drain pipe at a down slope of 1/100 or more.
• Do not place the drain pipe in drain channel where sulfuric gas exists.
• After installation, check that the drain pipe drains water properly from the outlet of
the pipe.
<Installation>
1. Apply polyvinyl chloride type adhesive over the shaded surfaces inside of the
drain pipe and on the exterior of the drain socket as shown.
2. Insert the drain socket deeply into the drain pipe <Figure 4.3.1>.
Note: Securely support the locally supplied drain pipe using pipe support to
avoid the drain pipe falling from the drain socket.
To prevent dirty water from draining directly onto the floor next to hydrobox,
please connect appropriate discharge pipework from the hydrobox.
<Checking Drainage>
• Check that the drain pipe drains water properly from the outlet of the pipe.
• Check for no leakage from the connection.
Note: Always check drainage at installation regardless of season.
• Remove the front panel and pour water of 1 litter into the drain pan <Figure 4.3.2>.
Note: Pour water slowly into the drain pan so that water does not overflow
from the drain pan.
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 hydrobox and outdoor unit.
4. Thoroughly clean and flush, system of all debris. (see section 4.2 for instruction.)
5. Fill hydrobox 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 4.3.3 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 both for the heating and cooling circuits 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*S*-*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 =
P ¹ + 0.098
1 −
P ² + 0.098
Graph to the right is for the following values
13
V : Necessary expansion vessel volume [L]
ε : Water expansion coefficient
G : Total volume of water in the system [L]
P ¹ : Expansion vessel setting pressure [MPa]
P ² : Max. pressure during operation [MPa]
ε : at 70 °C = 0.0229
P ¹ : 0.1 MPa
P ² : 0.3 MPa
*A 30% safety margin has been added.
Drain socket
Apply polyvinyl chloride
type adhesive
Locally supplied
drain pipe
(VP-20)
<Figure 4.3.1>
<Figure 4.3.2>
6. Check for leakages. If leakage is found, retighten the screws 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
Anti-freeze concentration [%]
Expansion vessel sizing
25
20
15
10
5
0
0 50 100
Do not pour water into these openings.
20 30 40 50
<Figure 4.3.3>
150 200 250 300
System water volume [L]
<Figure 4.3.4>
350 400