Danfoss FIA SS 15-65 Strainer in Stainless Steel Installation Guide

Danfoss FIA SS 15-65 Strainer in Stainless Steel

Installation

Note:
At delivery the strainer housing is not equipped with filter element or accessories

Maintenance

Refrigerants

• Applicable to HCFC, HFC, R717 (Ammonia), R744 (CO2) and all flammable refrigerants.
• The strainer is only recommended for use in closed circuits. For further information please contact your local Danfoss sales office.

Pressure and temperature range

• –60/+150°C (–76/+302°F)
  FIA SS 15-65:

• The strainers are designed for a max. working pressure of 52 bar (754 psi g)

Installation

Note:
At delivery the strainer housing is not equipped with strainer element or accessories

• The strainer must be installed with the top cover downwards, and the flow must be directed towards the top cover as indicated by the arrow on the strainer housing (fig. 1). The strainer element must be inserted after welding.
• The strainer housing is designed to withstand a high internal pressure. However, the piping system should be designed to avoid liquid traps and reduce the risk of hydraulic pressure caused by thermal expansion. It must be ensured that the strainer is protected from pressure transients like “liquid hammer” in the system.

Recommended flow direction
The strainer must be installed with the flow towards the top cover as indicated by the arrow on the side of the valve body (fig. 1). Flow in the opposite direction is not acceptable.

Welding

• To prevent damage to the gasket between the strainer body and top cover, the top cover should be removed before welding and protect it from dirt and moisture (fig. 2).

• Only materials and welding methods, compatible with the valve housing material, must be welded to the valve housing.

• Clean the strainer housing internally to remove welding debris at completion
  of welding and before the valve is reassembled.

• Removing the top cover can be omitted provided that:

• The temperature in the area between the valve body and top cover during welding does not exceed +150°C/+302°F.

• This temperature depends on the welding method as well as on any cooling of the strainer body during the welding itself.
  (Cooling can be ensured by, for example, wrapping a wet cloth around the strainer body.) Make sure that no dirt, welding debris etc. get into the strainer during the welding procedure.

• The strainer housing must be free from stresses (external loads) after installation.

• Strainers must not be mounted in systems where the outlet side of the strainer is open to atmosphere. The outlet side of the strainer must always be connected to the system or properly capped off, for example with a welded-on end plate.

Assembly

• Remove welding debris and any dirt from pipes and strainer body before assembly. Check that the strainer element has
  the right size before it is inserted in the top cover and check that the gasket is undamaged.

• Place the strainer element (pos. D) from underneath. The element has a slight force fit into the housing, no gaskets or O-rings are used.

• If magnet inserts have been chosen as accessory, fit those on the top cover before replacing the cover.

Tightening

• Tighten the top cover with a torque wrench, to the values indicated in the table (fig. 3).
• Please note that the table (fig. 3) containing maximum torque must be adhered to and never exceeded.
• If the drain valve has been chosen as accessory, the drain plug should be replaced by the drain valve.

Colours and identification

• The FIA SS valves are painted with a  red oxide primer in the factory. Precise identification of the valve is made via the ID plate on the top cover, as well as by the stamping on the valve body. The external surface of the valve housing must be prevented against corrosion with a suitable protective coating after installation and assembly.
• Be sure to protect the ID plate when repainting the valve.

Maintenance

Mounting of accessory:

• Strainer bag (fig. 4)
  • A 50µ strainer bag (pos. E), especially for commissioning of the plant, can replace the normal strainer element.
  • Mount the strainer bag (held in place by the strainer holder) and be sure to place the strainer bag correctly in the strainer as shown in fig. 4.
  • The flow must go into the strainer bag cavity and out or else the bag will not function properly.
• Dismantling the strainer (fig. 3)
  • Before servicing the strainer, isolate it from the system and remove all refrigerant by evacuation to zero pressure. Check for refrigerant pressure before unscrewing and removal of the top cover.
  • The strainer element must be removed without any use of tools

Cleaning
Clean the strainer element using an appropriate solvent by flushing and brushing. The use of strong acids cannot be recommended. The strainer element must be wiped or blown dry before inspection. If the element is damaged or the sediments cannot be removed, the strainer element must be replaced.

Assembly
Remove any dirt from the body before the strainer is assembled.

Replacement of gasket

• Change the gasket for the top cover (pos. C) and drain plug.
• Check that the strainer element is correctly placed before remounting the top cover and bolts (pos. A).

Tightening (fig. 3)

• Tighten the top cover bolts (pos. A) with a torque wrench according to the table in fig. 3
• Use only original Danfoss parts (including gaskets) for replacement. Materials of new parts are certified for the relevant refrigerant.
• In cases of doubt, please contact your local Danfoss sales office.

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