Daikin Modular Rotary Instructions For Installation, Use And Maintenance Manual page 40

DIRECT EXPANSION THERMAL EXCHANGE COILS
The filling by the installer must be performed according to current regulations and by authorised
personnel, authorised for the use and handling of coolants.
The heat exchange coils are installed with horizontal pipes.
Do not use the heat exchange coil connections to support the weight of the piping. It is neces-
sary to prepare appropriate fasteners and brackets (not supplied).
Shut-off valves must be included to exclude the heat exchange coil from the coolant circuit.
The system piping must be connected to the heat exchange battery with braze welding, circulating an-
hydrous nitrogen inside the pipes to prevent oxides from forming. The liquid suction pipes must be the
appropriate size for the expected potential and to ensure the circulation of the oil present in the coolant
even when the heat exchange coil operates at minimum load.
Use of wet patches to protect the plastic against the heat of the flame.
13
Example of connection to gas coils
40
Coolant
inlet
Vapour outlet
Condensate
drain
Shut-off
valve