Service manual

SERVICING
165
3. An inverted suction line trap must be installed on the suction line just before the inlet to the indoor unit (see Figure
4-1). The top of the inverted loop must be slightly above the top of the indoor unit coil and can be created simply by brazing
two 90° long radius elbows together if a bending tool is unavailable. Properly support and secure the inverted loop to
the nearest point on the indoor unit or adjacent structure.
4. An accumulator is required to be added (external to the outdoor unit, within 2 linear feet of the outdoor unit) for air
conditioning installations. See Table 4-1 for accumulator selection. Adapter fittings at the accumulator connection may
be required. Do NOT install an accumulator in the suction line set in heat pump applications.
L
H
L = Length of trap must be more than Indoor Unit Height (H)
Figure 4-1. Indoor Unit with Inverted Suction
oz. lb. Part Number Connection Part Number Connection
112 7 0151R00004P 3/4" 0151R00004P 3/4"
144 9 B1226206 3/4" 0151R00004P 3/4"
176 11 B1226207 7/8" B1226206 3/4"
208 13 0151L00008 7/8" B1226206 3/4"
240 15 0151L00009 7/8" B1226207 7/8"
288 18 0151L00001 1 1/8" 0151L00008 7/8"
352 22 0151L00010 7/8" 0151L00001 1 1/8"
480 30 0151L00010 7/8" 0151L00010 7/8"
Total System Refrigerant
Charge
Preferred Minimum
Goodman Accumulator
Table 4-1. Accumulator Size
SECTION 5. CALCULATIONS - TUBING EQUIVALENT LENGTH, TUBE SIZE AND REFRIGERANT
1. In long line applications the “equivalent line length” is the sum of the straight length portions of the suction line plus
losses (in equivalent length) from 45 and 90 degree bends. Add the total straight (lineal) length of tubing to the
equivalent length of elbows and bends to get total equivalent length.
Equivalent length = Length
Horizontal
+ Length
Vertical
+ Losses from bends (see Table 5-1)
2. Table 5-1 lists the equivalent length gained from adding bends to the suction line. Properly size the suction line to
minimize capacity loss.
3/4 7/8 1 1/8
90° short radius 1.7 2 2.3
90° long radius 1.5 1.7 1.6
45° 0.7 0.8 1
Inside Diameter (inches)
Type of
Elbow Fitting
Table 5-1. Losses from suction line elbows (equivalent length, ft.)
EXAMPLE: 3/4” suction line using 3/4” elbows
150 feet of straight tubing + (four short radius elbows x1.7) + (2 long radius elbows x1.5) =
150 + 3.4 + 3 = 156.4 equivalent feet