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AFP • Antifreeze valves
The mechanical antifreeze valves (iStop® 108701 en 108702) are used to keep the water in the heating
and cooling circuit running and to prevent ice formation. When
the temperature of the fluid reaches 3°C, the internal
sensor opens and allows water to drain out of the system. This valve is designed
for systems with monobloc heat pumps and prevents damage to
the machine and the circuit components if the power supply is cut off
and the temperature of the fluid drops below 3°C.
The iStop® 108701 valve is suitable for standard heat pumps with a supply water temperature up to 65 °C.
The iStop® 108702 valve is designed for heat pumps using the new refrigerants with a supply water temperature up to 90 °C.
Brand
Caleffi
Composition
- Sold by piece
Installation
The device must only be installed in a vertical position, with the outlet
facing downwards, to allow the drained water to flow out properly and
free from obstructions.
The antifreeze valves must be installed outdoors, where the lowest
temperatures are reached if the heat pump is blocked. The antifreeze
valves must be positioned far away from heat sources in order to maintain proper operation.
It is recommended to install the antifreeze valves on both pipes (flow
and return). Otherwise, the pipe may remain filled with water, leading to the risk of ice formation.
The complete installation and commissioning instructions can be found in the manual under “Downloads”.
Specifications
- Connection: G 1 1/4" A (ISO 228-1) M
- Maximum operation pressure: 10 bar
- Fluid temperature range:
- AFP (iStop® 108701): 0 to 65°C
- AFP HT (iStop® 108702): 0 to 90°C
- Ambient temperature range: -30 to 60°C
- Opening temperature: 3°C
- Closing temperature: 4°C
- Material: brass
Accessories
Loose nut coupling, type: LCJ
Applicable outdoor units
- Monoblock, type: CGW-M (R32 - water temperature up to 55°C)
- Monoblock, type: CGW-M SG (R32 - water temperature up to 55°C)
- Monoblock, type: CWP-M (R290 - water temperature up to 75°C)
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