Liebert 50 & 60Hz, 8 Tons user manual Total refrigerant = Units and Lines, Quick Connect Fittings

Site Preparation and Installation

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 7 8-ton unit refrigerant charge

	Evaporator
	Charge (ounces)
Model No.
	3-ton circuit	5-ton circuit
MMD96E	7	7
MMD95E	7	7
	Condensing Units
Model No	Charge (ounces)
MCD96A	361	581
MCD95A	361	581
MCD98W	54	94
MCD97W	54	94

Table 8	Line charges (field piping)*
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 10 m)

Quick Connect Fittings

NOTE

When hard piping is used, complete all piping and evacuate lines before connecting quick connects.

Be especially careful when connecting the quick connect fittings. Read through the following steps before making the connections.

1.Remove protector caps and plugs.

2.Carefully wipe coupling seats and threaded surfaces with a clean cloth.

3.Lubricate the male diaphragm and synthetic rubber seal with refrigerant oil.

4.Thread the coupling halves together by hand to insure that the threads mate properly.

5.Tighten the coupling body hex nut and union nut with the proper size wrench until the coupling bodies “bottom out” or until a definite resistance is felt.

6.Using a marker or pen, make a line lengthwise from the coupling union nut to the bulkhead.

7.Tighten the nuts an additional quarter-turn; the misalignment of the lines shows how much the coupling has been tightened. This final quarter-turn is necessary to insure that the joint will not leak. Refer to Table 9 for torque requirements.

Table 9 Refrigerant quick connect sizes and torque

Size O.D. Cu	Coupling Size	Torque (lb-ft)
3/8"	#6	10-12
1/2"	#10	35-45
7/8"	#11	35-45
1-1/8"	#12	50-65

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