DE DIETRICH ROE-II _ ROE-H - Manual (Page 33)

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13/01/2011 - 300019360-001-I ROE-II / ROE-H
6 Switching off the appliance
6.1 Protection against frost
To make the installation safe and prevent any risk of freezing if the
heating system shuts down or if there is a power cut, protect the
interior hydraulic circuit with a water + antifreeze mixture + corrosion
inhibitor.

Do not use mono-ethylene glycol based products (toxic
products).
Use solutions based on monopropylene glycol or on a natural
compound which also contains one or more corrosion inhibitors
(never use monopropylene glycol alone without a corrosion inhibitor).
Concentrated antifreeze: Package EG11.

Always mix water + antifreeze + inhibitor in a receptacle
BEFORE pouring it into the installation.

Respect the antifreeze percentages.
1. Carefully prepare the installation to be protected against frost:
- Flush the installation
- Clean the installation with an appropriate product
- After the final rinse, completely drain the installation.
2. Fill the installation with the water + antifreeze + inhibitor mixture
under pressure using a hydraulic pump.
3. Vent the heating installation.
4. Run the mixture through the entire installation for at least 2 hours
before starting up the heat pump
5. Check the final dose with a densimeter or a refractometer
6. Check the pH obtained
7. Affix a label in a clearly visible position showing the following
information :
- Antifreeze present in the installation
- Name of the product and the supplier
- Dosage of antifreeze and pH on commissioning

If a top-up is necessary, do it with a mixture identical to the
product used initially.
Check the antifreeze dosage and the pH once a year.

If using glycol water, the valve must be connected to a
recycling system.