APC AFX Series Technical Information download pdf (Page 12)

9Remote Air Cooled Condenser

Refrigerant Piping

Recommended line sizes

See the NetworkAIR FM Installation Manual for detailed installation information.

Follow ASHRAE and ARI guidelines for velocity and pressure drop in refrigerant piping design.

Vertical discharge lines shall have a loop down to the floor or a trap at a minimum of one (1) per vertical

run closest to the compressor, and additional traps at approximately every 20 feet to prevent oil return to

the compressor discharge.

Total pressure drop in the gas and liquid lines should not exceed 6 PSID for the AFX and FM series. The

installing contractor should verify their pressure drop based on type of pipe and fittings used. All piping

should be as clean as new, with a flush procedure and cleanliness testing for piping prior to being put into

service. In addition, pressure test lines with an inert gas (nitrogen) for leakage, prior to charging with

refrigerant.

Install piping in accordance with ASHRAE, ARI, and local and national codes. Piping shall be properly

supported throughout its entire length, with provisions for expansions due to temperature changes.

Insulate hot gas discharge sections and liquid return lines to prevent early condensation, maintain

required degrees of sub-cooling, and safeguard against personnel hazard from contact. All horizontal gas

discharge runs of piping should slope/pitch down and in the direction of flow away from the

compresor(s) at 1 inch over 10 feet. Return liquid lines should slope/pitch down and in the direction of

flow toward the compressor(s) at 1 inch over 10 feet.

Equivalent

Length ft

(meters) Line type FM35 FM40 FM50

AFX

018

AFX

065

50 (15.25) Discharge line (horizontal) 1 1/8 1 1/8 1 3/8 7/8 1 3/8

Discharge line (vertical) 7/8 7/8 1 1/8 7/8 1 3/8

Liquid line 7/8 7/8 7/8 3/8 7/8

Flooded condenser to receiver 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8

100 (31) Discharge line (horizontal) 1 1/8 1 3/8 1 3/8 7/8 1 3/8

Discharge line (vertical) 7/8 7/8 1 1/8 7/8 1 3/8

Liquid line 7/8 7/8 7/8 3/8 7/8

Flooded condenser to receiver 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8

150 (46) Discharge line (horizontal) 1 1/8 1 3/8 1 5/8 1 1/8 1 5/8

Discharge line (vertical) 7/8 7/8 1 1/8 1 1/8 1 5/8

Liquid line 7/8 7/8 1 1/8 5/8 1 1/8

Flooded condenser to receiver 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8

200 (61) Discharge line (horizontal) 1 1/8 1 3/8 1 5/8 1 1/8 1 5/8

Discharge line (vertical) 7/8 7/8 1 1/8 1 1/8 1 5/8

Liquid line 7/8 7/8 1 1/8 5/8 1 1/8

Flooded condenser to receiver 1 1/8 1 1/8 1 1/8 1 1/8 1 1/8

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 22 23

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APC AFX Series Technical Information Page 12

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