Emerson Figure i User Manual

Page of 36
Installation
15
Figure 12 Refrigerant piping diagram
Table 5
Pipe length and condenser elevation relative to evaporator
Nominal
System Size
Tons
Max. Equiv.
Pipe Length
ft. (m)
Maximum PFH
Level Above
Evaporator, ft. (m)
Maximum PFH 
Level Below 
Evaporator, ft. (m)
1 or 1.5
 50 (15)
40 (12)
15 (4.6)
2
100 (30)
40 (12)
15 (4.6)
3, 3.5, 5 or 8
150 (45)
50 (15)
15 (4.6)
Table 6
Equivalent lengths for various pipe fittings, ft (m)
Copper Pipe
OD, in.
90 Degree
Elbow Copper
90 Degree
Elbow Cast
45 Degree
Elbow
Tee
Gate
Valve
Globe
Valve
Angle
Valve
1/2
0.8 (0.24)
1.3 (0.39)
0.4 (0.12)
2.5 (0.76)
0.26 (0.07)
7.0 (2.13)
4.0 (1.21)
5/8
0.9 (0.27)
1.4 (0.42)
0.5 (0.15)
2.5 (0.76)
0.28 (0.08)
9.5 (2.89)
5.0 (1.52)
3/4
1.0 (0.3)
1.5 (0.45)
0.6 (0.18)
2.5 (0.76)
0.3 (0.09)
12.0 (3.65)
6.5 (1.98)
7/8
1.45 (0.44)
1.8 (0.54)
0.8 (0.24)
3.6 (1.09)
0.36 (0.1)
17.2 (5.24)
9.5 (2.89)
1-1/8
1.85 (0.56)
2.2 (0.67)
1.0 (0.3)
4.6 (1.4)
0.48 (0.14)
22.5 (6.85)
12.0 (3.65)
1-3/8
2.4 (0.73)
2.9 (0.88)
1.3 (0.39)
6.4 (1.95)
0.65 (0.19)
32.0 (9.75)
16.0 (4.87)
1-5/8
2.9 (0.88)
3.5 (1.06)
1.6 (0.48)
7.2 (2.19)
0.72 (0.21)
36.0 (10.97)
19.5 (5.94)
Refrigerant trap = Four times equivalent length of pipe per this table
Evaporator
Evaporator
Condensing 
Unit
Condensing 
Unit
NOTE
When installing remote condensing units below the 
evaporator, the suction gas line should be trapped with
an inverted trap to the height of the evaporator This 
prevents refrigerant migration to the compressors 
during off cycles Maximum recommended vertical 
level drop to condensing unit is 15 ft. (4.6m)  .
Pitch down 1/2" (13mm) per 10 ft. (3m)
Suction Line Piping
Condensing Unit Above Evaporator
Traps recommended at the base of riser 
exceeding 5 ft (1.5m) and every 20 feet 
(6m)  of vertical rise.
Suction Line Piping 
Condensing Unit 
Below Evaporator
vertical rise recommendation 
above evaporator.
NOTE
When installing remote condensing units below the 
evaporator, the suction gas line should be trapped 
with an inverted trap to the height of the evaporator. 
This prevents refrigerant migration to the compres-
sors during off cycles. Maximum recommended verti-
cal level drop to condensing unit is 15 ft. (4.6m).