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3.4 Fan Speed Control Systems
Fan Speed Control provides an infinite number of speed variations on specially designed, permanent
split-capacitor motors. The control module varies the air quantity passing over the condenser coil by
monitoring refrigerant pressure.
3.4.1 Materials Supplied
1. Built-in pre-wired condenser control box
2. Air cooled condenser
3. Piping access cover to be reinstalled when piping is complete
4. Bolts (four per leg) 3/8" x 5/8"
5. Terminal block for two-wire, 24-volt interlock connection between unit and condenser
6. Condenser legs, four on one-fan models
Table 6 Equivalent lengths (feet) for various pipe fittings
Copper Pipe
O.D. in.
90 Degree
Elbow Copper
90 Degree
Elbow Cast
45 Degree
Elbow Tee
Gate
Valve
Globe
Valve
Angle
Valve
1/2 0.8 1.3 0.4 2.5 0.26 7.0 4.0
5/8 0.9 1.4 0.5 2.5 0.28 9.5 5.0
3/4 1.0 1.5 0.6 2.5 0.3 12.0 6.5
7/8 1.45 1.8 0.8 3.6 0.36 17.2 9.5
1-1/8 1.85 2.2 1.0 4.6 0.48 22.5 12.0
1-3/8 2.4 2.9 1.3 6.4 0.65 32.0 16.0
1-5/8 2.9 3.5 1.6 7.2 0.72 36.0 19.5
Refrigerant trap = 4 times equivalent length of pipe per this table.
Table 7 Indoor unit refrigerant charge lbs (kg) R22 or R407C (per unit serial tag)
Model
R22 R407C
Approximate Charge
lbs (kg)
Approximate Charge
lbs (kg)
42A/40A 1.0 (0.45) 0.9 (0.4)
67A/65A 1.5 (0.68) 1.4 (0.6)
Table 8 Line charges - refrigerant per 100 ft (30 m) of Type "L" copper tube
O.D.
R22 R407C
Liquid Line
lbs (kg)
Hot Gas Line
lbs (kg)
Liquid Line
lbs (kg)
Hot Gas Line
lbs (kg)
1/2" 7.3 (3.3) 1.3 (0.6) 6.9 (2.9) -
5/8" 11.7 (5.3) 2.1 (1.0) 11.0 (4.6) 2.2 (0.9)
3/4" 16.6 (7.5) 3.0 (1.4) 15.7 (6.5) 3.1 (1.3)
7/8" 24.4 (11.1) 4.4 (2.0) 23.0 (9.6) 4.5 (1.9)
Table 9 Condenser refrigerant (per serial tag)
Model
R22 R407C
Approximate Charge
lbs (kg)
Approximate Charge
lbs (kg)
Fan Speed Lee-Temp* Fan Speed Lee-Temp*
083 5 (2.27) 27 (12.3) 8 (3 ) 25 (12)
104 8 (3.63) 39 (17.7) 9 (4) 37 (17)
* Charge includes the receiver charge.