Refrigeration Piping Connections; Refrigeration Piping Installation - Emerson Copeland EazyCool ZX Series Application Manuallines

3.2

Refrigeration piping connections

3.2.1 Refrigeration piping installation

WARNING
High pressure! Risk of personal injury! The units are pressurized with dry
air. Be careful when opening connections on a pressurized item.
WARNING
Low surface temperature! Danger of frostbite! The liquid line should be
insulated with 19 mm insulation thickness. Temperature could be as low as
-15 °C.
IMPORTANT
Tubing quality! Installation contamination! All interconnecting piping
should be of refrigeration grade, clean, dehydrated and must remain capped
at both ends until installation. Even during installation, if the system is left for
any reasonable period of time, eg, 2 hours, pipes should be re-capped to
prevent moisture and contaminant from entering the system.
Connection sizes! Unsuitable refrigerant flow rate! Do not assume that the
service connection sizes on the unit (at the service valves) are in fact the
correct size to run the interconnecting refrigeration pipes. The service valve
sizes have been selected for convenience of installation and in some cases
(larger units) these may be considered too small. However, for the very short
pipe run within these units these service connection sizes are adequate. All
interconnecting piping should be sized to satisfy the duty required.
The pipe should be sized to ensure optimum performance and good oil return. The sizing must also
take into account the full capacity range through which a particular unit will need to operate.
Unit
ZXMY-020E & ZXMY-030E
ZXDY-030E
ZXMY-040E to ZXMY-075E
ZXDY-040E to ZXDY-075E
Table 28: Piping connection sizes
Pipe runs should be kept as short as possible, using the minimum number of directional changes.
Use large radius bends and avoid trapping of oil and refrigerant. This is particularly important for the
suction line. The suction line should ideally slope gently towards the unit. Recommended slope is
1/200 to 1/250. Upper and lower oil traps, double risers and reduced pipe diameters may be required
for suction lines where long vertical risers cannot be avoided.
All pipes should be adequately supported to prevent sagging which can create oil traps. The
recommended pipe clamp support distances are shown in Table 29 below:
Tube size
1/2" (12.7 mm)
5/8" (16.0 mm)
7/8" (22.0 mm)
1 1/8" (28.5 mm)
Table 29: Maximum distances between 2 clamp supports
30
Suction line
(ODS)
3/4" (19.05 mm)
7/8" (22.23 mm)
Max distance between
2 clamp supports
1.20 m
1.50 m
1.85 m
2.20 m
Liquid line
(IDS)
1/2" (12.7 mm)
1/2" (12.7 mm)
AGL_Unit_ZX_A2L_E_Rev00