Freeze Protection - Samsung RC***MHXGA Installation Manual

Piping Work
 Before installing/commissioning the unit, make sure to check the following points;
- The maximum water pressure of the unit is 2.8 bar static pressure.
- The operating range of water temperature is 15~55˚C at heating conditions and 5~25˚C at cooling conditions.
- The minimum required water flow for operation is 12~16 liters/min.
At all times the required water flow-rates should remain. Otherwise, the unit can stop due to a lack of water.
- Water quality must be according to EN directive 98/83 EC.
- If the unit and the pipes are exposed to freezing temperature, It can cause damage to the hydraulic system.
Special care must be taken to prevent freezing of the total water system.
- The unit is designed to be used in a closed-loop system. Do not use any other components which are designed only for a open-loop system.
- Never use Zn-coated parts in the water circuit.
- All hydraulic parts including field piping must be insulated to reduce heat loss and condensation.
- It is recommended to install the make-up water assembly to feed small quantities of water to the system automatically,
replacing the minor water losses and maintaining the system pressure.
- Drain taps must be provided at all low points of the system to permit complete drainage of the circuit for maintenance use.
- Make sure that the check valves are correctly installed in the system (field supply).
- Flush pipes out with clean water to remove contaminants in pipes during installation.
- The strainer(water filter) must be cleaned after flushing the pipes, and it should be cleaned periodically.
Replace strainer when necessary.
- Charging; Charge the water until a pressure of 1.5~2.0bar by using make-up water assembly(Field supply).
(The water pressure indicated on the manometer will vary depending on the water temperature)
The nominal water pressure in the system should remain about 1.0 bar at all times to avoid air entering the water system.
- Air purging; Make sure that air should be vented from the system at start-up or after installing/ servicing.
The air vent valve must be opened during charging the water (at least 2 turns) in order to remove
all air in the circuit, and a make-up water assembly allows water into the system continuosly.
- In case that the water piping would be located in a higher position than the air vent of the unit, it is necessary to add an
additional ones in the highest position of water circuit. The air vent should be located both where water temperatures are the
highest and where the height of pipes are the highest.
- Always use materials which are compatible with water used in the system and with the materials used on the indoor unit.
- Select piping diameter in relation to required water flow and available ESP of the pump.
- Use chemical cleaning agents(Begin with acid , finish with alkali).
- Do not operate the system with closed valves because it results in damaging the heat pump.

Freeze Protection

Frost can make some damage on the hydraulic system. It is because it is installed outside house nomally. To avoid taking risks of
freezing problem, special cares such as Anti-freezing fluid are required as below.
Ethylene glycol concentration can vary depeding on outdoor temperature where our system is installed, fill in Ethylene glycol
by mixing as below.
Ethylene Glycol Is Toxic
Ethylene glycol is toxic if swallowed, and therefore is a hazard to animals and small children.
Ethylene glycol must be handled in accordance with relevant local laws and regulations.
Outdoor temperature
23°F (–5°C)
14°F (–10°C)
5°F (–15°C)
–10°F (–20°C)
24
Ethylene Glycol(%)
10
20
25
35