Installation and Maintenance Manual

Installation - Mechanical
RLC-SVX09H-EN 71
Shown in Figure 40, p. 70 are RTUD 100 ton andTrane
Levitor II condenser designed for a leaving evaporator
water temperature of 42°F.This example will show how to
calculate the line sizes for both the liquid and discharge
lines.The discharge line consists of one long radius elbow
and 4 short radius elbows.The liquid line also consists of
one long radius elbow and 4 short radius elbows.
Discharge Line
Actual length of lines=2+5+71+15.5+5 = 98.5 ft.
Total equivalent length = 1.5 x 98.5= 147.75 ft.
Approximate line size for discharge lines
Table 54, p. 67 = 2 1/8”
Equivalent length of one long radius elbow at 2 1/8”
Table 39 = 3.4 ft.
Equivalent length of 4 short radius elbows at 2 1/8”
Table 39 = 4 x 5.2 ft. = 20.8 ft.
Total equivalent length = 98.5+ 3.4 + 20.8 = 122.7 ft.
New line size for discharge lines remains
Table 54
Ckt 1= 2 1/8”
Ckt 2= 2 1/8”
ALL DISCHARGE LINE SIZES ARE = 2 1/8”
Liquid Lines
Actual length of liquid lines=8+75+20+8=111ft.
Total equivalent length = 1.5 X 111 =166.5 ft.
Approximate liquid line size
Table 42, p. 63 = 1 1/8”
Equiv. length of one long radius elbow at 1 1/8”
Table 39=1.9
Equiv. length of 4 short radius elbows at 1 1/8”
Table 39= 4 x 2.7 ft. =10.8 ft.
Total equivalent length = 111 + 1.9 + 10.8 =123.7 ft.
Table 42
Ckt 1= 1 1/8”
Ckt 2= 1 1/8”
ALL LIQUID LINE SIZES ARE = 1 1/8”
Refrigerant Charge Determination
The approximate amount of the refrigerant charge
required by the system must be determined by referring to
Table 64 and must be verified by running the system and
checking the liquid line sightglasses.
Note: The maximum charge can reduce the maximum
length of the piping. Due to maximum allowable
refrigerant charge not all units can have 200 feet of
piping.
To determine the approximate charge, first refer to
Table 64 and establish the required charge without the
field-installed piping.Then refer toTable 65, to determine
the charge required for the field-installed piping.The
approximate charge is therefore the sum of the values
from Table 64 and Table 65.
Note: The amounts of refrigerant listed in Table 65 are
based on 100 feet of pipe. Actual requirements will
be in direct proportion to the actual length of the
piping.
Note: Table 65 assumes: LiquidTemperature = 105°F;
Saturated DischargeTemperature = 125°F;
Discharge Superheat = 30°F.
Table 64. System refrigerant charge - lbs
Condenser RTUD Max. Unit Charge
Ton Ckt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2
80 40 40 50 50 318 318
90 52 52 49 49 308 308
100 68 68 47 47 308 308
110 68 68 65 65 359 359
120 85 85 64 64 352 352
130 85 85 64 64 352 352
150 76 76 62 62 347 347
160 76 76 66 66 396 396
180 76 101 66 66 396 396
200 101 101 66 66 391 391
220 101 134 63 63 382 382
250 134 134 61 61 373 373
Table 65. Field-installed piping charge
Pipe O.D.
Discharge Line
(lbs) Liquid Line (lbs)
1 1/8 - 41
1 3/8 - 62
1 5/8 - 88
2 1/8 8 154
2 5/8 13 -
3 1/8 18 -
4 1/8 32 -