Emerson Liebert Prop Fan Condensing Unit Manual de instalación descargar pdf (Pagina 18)

Site Preparation and Installation

Water/Glycol Piping—Water and Glycol cooled systems require coolant loop connections as speci-

fied in the condensing unit installation instructions.

Refrigerant (R-22) Piping—All split systems require two refrigerant lines (an insulated copper suc-

tion line and a copper liquid line) between the evaporator and the condensing unit.

Two possible methods exist for installing the copper suction and liquid lines.

• Close coupling the units together using the quick connects. (See Figure 7).

• Using an optional Sweat Adapter Kit and hard piping between the two units.

All refrigeration piping should be installed with high temperature brazed joints. Prevailing good

refrigeration practices should be employed for piping supports, leak testing, evacuation, dehydration

and charging of the refrigeration circuits. The refrigeration piping should be isolated from the build-

ing by the use of vibration isolating supports. To prevent tube damage when sealing openings in walls

and to reduce vibration transmission, use a soft flexible material to pack around the tubes.

When installing remote condensing units above the evaporator, the suction gas line should be trapped

at the evaporator. This trap will retain refrigerant oil in the off cycle. When the unit starts, oil in the

trap is carried up the vertical riser and returns to the compressor.

Refrigerant Charge Requirements—Total refrigerant charge (R-22) will be required only if units

are evacuated during installation or maintenance. For safe and effective operation, refer to 2.4.3 -

Piping Connections and Coolant Requirements.

Total refrigerant = Units and Lines

Table 6 Recommended line sizes

Equivalent

Feet

Liquid

O.D. Cu

Suction

O.D. Cu

up to 45 1/2” 1-1/8”

NOTE

If field supplied refrigerant piping is installed, refrigerant (R-22) must be added to the

system.

Table 7 5 ton unit refrigerant charge

Evaporator

Model No. Charge (ounces)

MMD60E 4

MMD59E 4

Condensing Units

Model No Charge (pounds)

Units are charged at the factory with

R-22 Refrigerant per Table 7. If field-

supplied piping is installed, refrigerant

must be added to the system per

Table 8.

MCD65A 27.0

MCD64A 27.0

MCD69A 5.9

MCD68A 5.9

Table 8 Line charges

O.D. Liquid Line Suction Line

1/2” 7.3 (1.1) 0.2 (0.1)

5/8” 11.7 (1.7) 0.3 (0.1)

7/8” 24.4 (3.6) 0.7 (0.1)

1-1/8” 41.6 (6.2) 1.2 (0.2)

* weight of R-22 in type “L” copper tube: lb per

100 ft (kg per 10m

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 67 68

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