APC AFX Series Technical Information Page 16

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13Remote Air Cooled Condenser
Piping Volume
Piping Insulation
See “Piping Diagrams” on page 7 for details and locations of recommended valves.
To prevent condensation on piping, proper pipe insulation must be practiced. Insulate all piping that is
exposed to sunlight
Temperature Controls
Operation
The OHEs use A350A/B and S350A/B temperature controllers to regulate fan operation. These
controllers operate on 24 VAC, and each provides an SPDT relay output. Each controller has a front
panel LED that indicates when the relay is energized.
Adjustable features include:
setpoint
differential
heating/cooling jumpers
Note: All System 350 controls are designed for use ONLY as operating controls.
Where an operating control failure would result in personal injury or loss of property, it
is the responsibility of the installer to add devices (safety, limit controls) that protect
against, or systems (alarm, supervisory systems) that warn of, control failure.
Overall System Charge = CRAC Unit Charge* + Larkin Condenser Summer Charge +
Liquid line charge between CRAC unit and Condenser + Optional Flooded Charge.
Density of liquid R22 @ 105°F 260 psig = 70.3 lb/ft3 (40.5°C 1793 kPa = 95 N m)
Inside diameter for 7/8 in (22 mm) OD ACR copper tube is 0.785 in (20 mm)
Cross sectional area for 0.785 in (20 mm) ID pipe is 0.00336 ft
2
(312 mm
2
)
R22 in liquid line = area × Length in ft × density = 0.00336 ft
2
× L ft × 70.3 lb/ft
3
(312 mm
2
× L m × 1126 kg/m
3
)
Liquid line charge for 7/8 in (22 mm) OD ACR copper tube is 2.36 lbs/10 ft R22
(1 kg/3 m)
Inside diameter for 1 1/8 in (28.6 mm) OD ACR copper tube is 1.025 in (26 mm)
Cross Sectional Area for 1.025 (26 mm) ID pipe is 0.00573 ft
2
(532 mm
2
)
R22 in Liquid line = area × Length in ft × density = 0.00573 ft
2
× L ft × 70.3 lb/ft
3
(532 mm
2
× L ft × 1126 kg/m
3
)
Liquid line charge for 1 1/8 in (28.6 mm) OD ACR copper tube is 4.03 lbs/10 ft R22
(1.8 kg/3 m)
Note:*FM35 charge = 11.3 kg (25 lbs)
*FM50 charge = 11.3 kg (25 lbs)
*AFX 018 charge = 6 kg (13 lbs)
*AFX 065 charge = 20 kg (44 lbs)
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