13
• Pitch the discharge piping down and away from the In-Row Cooler at a decline of 1 in. per 10 ft. (10 mm per 1 m).
• Use Type L ACR copper tubing.
• Install tube supports where necessary.
• When passing piping through a wall or other obstacle, use a brass cushion to prevent direct contact with the wall when
vibration occurs.
• Insulate the liquid line to prevent exposure to direct sunlight.
Notice the trap locations in Figure 4-2: Piping Trap Examples below. Traps installed in the discharge and liquid piping prevent
liquid backflow to the In-Row Cooler and help retain compressor oil when in standby or powered off.
P-Trap S-Trap Inverted-Trap
Figure 4-2: Piping Trap Examples
Whenever the condenser is located above the In-Row Cooler:
• Install a P-trap at the lowest pitched point of the horizontal discharge piping.
• Install inverted traps or check valves at the condenser inlet and outlet.
• Install an S-trap every 20 ft. (6 m) of vertical height of the discharge piping when the installation vertical height is over 30 ft.
(10 m). Refer to the
Vertical Discharge Piping S-Traps
table.
Table: Vertical Discharge Piping S-Traps
Vertical Distance
Number of Traps
Less than 30 ft. (10 m)
0
30 to 40 ft. (10 to 12 m)
1
40 to 60 ft. (12 to 18 m)
2
60 to 65 ft. (18 to 20 m)
3
Note:
Calculate the number of inverted traps from the total vertical height, not per individual vertical run. For example, two vertical runs of
18 ft. each is a total of 36 ft., which requires one inverted trap.
Using the
Equivalent Length of the Sub-Assembly
table, multiply the equivalent length of each elbow type by the total
quantity of each elbow, based off
Table: Recommended Piping Diameters
.
4. Piping Installation
