Frost Protection - Biddle DF Series Manual

DF M
ANUAL
Manual version 3.0 - North America (15-07-2014)

2.5.2 Frost protection

Take the following precautions if you install the unit in a room
where frost may occur:
• Provide for constant circulation of the water at the right
temperature;
• Add up to 20% glycol to the water when the unit is not in
operation during the wintertime;
• Or bleed the system and the unit.
2.5.3 Connecting the water-side control
1. Open the unit.
2. Connect the unit and the three-way valve to the central
heating system as shown in the diagram.
Note:
n
The diameter of the bypass pipe from Connection B
to the return pipe must be at least 22 mm(7/8").
3. Connect the valve to Terminal Block 1 as shown in the
electrical diagram.
4. Open the valve manually using the handle (Position 'MAN').
5. Fill and bleed the system.
6. Check the connections for leakage.
7. Return the handle to its starting position
(Position 'AUTO').
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NSTALLATION
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