Mitsubishi Electric EHSD-MEE - Filling the System (Primary Circuit)

22
1. Check and charge expansion vessel.
2. Check all connections including factory tted ones are tight.
3. Insulate pipework between hydrobox and outdoor unit.
4. Thoroughly clean and ush all debris from the system. (Refer to 4.2 in the installation manual.)
5. Fill hydrobox with potable water. Fill primary heating circuit with water and suitable anti-freeze and inhibitor as necessary.
Always use a lling loop with double check valve when lling the primary circuit to avoid back ow contamination of water supply.
6.
Check for leakages. If leakage is found, retighten the screws onto the connections .
• Anti-freeze should always be used for package systems. It is the responsibility of the installer to decide if anti-freeze solution should be used in split systems
depending on each site’s conditions. Corrosion inhibitor should be used in both split and package systems.
Figure below shows freezing temperature against anti-freeze concentration. This gure is an example for FERNOX ALPHI-11. For other anti-freeze, please refer
to relevant manual.
• When connecting metal pipes of di󰀨erent materials, insulate the joints to prevent a corrosive reaction taking place which will damage the pipework.
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)
10. After removing the air, automatic air vent MUST be closed.
Filling the System (Primary Circuit)
Draining the Hydrobox
WARNING: DRAINED WATER MAY BE VERY HOT
1. Before attempting to drain the hydrobox, isolate from the electrical supply to prevent booster heater burning out.
2. Isolate hydrobox from primary water circuit and drain water from hydrobox. Use a suitable heat resistant hose to assist in these operations.
3. Drain any remaining water from booster heater using tted drain cock and hose, and the drain valve on the primary circuit to safely drain the unit.
4. After the hydrobox is drained, water remains in the following component parts. Drain water completely by checking the inside of the parts.
• Strainer (Remove the strainer cover.)
• Pressure relief valve (Operate the valve.)
0
−25
−20
−15
−10
−5
5
0
10 20 30 40 50
Freezing temperature [°C]
Anti-freeze concentration [%]
OCH815A