Liebert XDC Filling the Direct Expansion DX Circuit-R-407c, Indoor unit refrigerant charge-R-407c

Piping and Filling with Refrigerant: R-134a and R-407c Circuits

2.7Filling the Direct Expansion (DX) Circuit—R-407c

NOTE

If necessary, refer to 3.0 - Installation Checklist to ensure that the system has been properly checked out and is ready to be filled with coolant.

Any recommended volumes will be approximate. The user must verify that all circuits of the system have been adequately filled.

For Air Cooled Lee-Temp / Flood Back Head Pressure Control Units Only

NOTE

Proper safety equipment and proper refrigeration tools are required. Check unit nameplate for correct refrigerant type before topping off or recharging a system.

NOTE

Refrigerant R-407c is a blend of three components, and must be introduced and charged from the cylinder only as a liquid.

Refrigerant R-407c uses a POE (polyolester) lubricant. Do not open the compressor unit piping to the atmosphere for more than 15 minutes. The compressors contain POE oil that is very hygroscopic; it quickly absorbs water from the atmosphere. The longer the compressor piping is left open to the atmosphere, the harder it will be to fully evacuate. If left open too long, the POE oil may need to be replaced before achieving the required vacuum level.

1.Make sure the Liebert XDC is Off.

2.Connect the refrigerant gauge charging hose to the refrigerant drum and to the receiver at the rotalock valve and/or to the Schrader valves on the liquid lines.

3.Weigh in the calculated charge based on Tables 14, 15, 16 and 17—values are maximum, based on outdoor air temperature of -30°F (-34°C).

4.Open the rotalock valve and fill the complete calculated charge.

Table 14 Indoor unit refrigerant charge—R-407c

Model 50/60 Hz	Charge/Circuit, lb. (kg)
Liebert XDC160	17.5 (8.0)

Table 15 Outdoor air condenser charge—R-407c

Outdoor Ambient, °F (°C	Model 50/60 Hz	Charge / Circuit, lb (kg)
-30 to 95 (-34 to 35)	CDL830 or CSL415	200 (90.8)
-30 to 100 (-34 to 38)	CDL830 or CSL415	200 (90.8)
-30 to 105 (-34 to 41)	CSL616	254 (115.2)
35 to 105 (2 to 41)	CSL616	164 (74.5)

Table 16 Air cooled systems - liquid line charge - R-407c refrigerant per 100 ft (30 m) of Type "L" copper tube

O.D., inches	Liquid Line, lb (kg)		Hot Gas Line, lb (kg)
3/8	3.7	(1.7)	-
1/2	6.9	(3.1)	-
5/8	11.0 (5.0		2.2 (1.0)
3/4	15.7 (7.1)		3.1 (1.4)
7/8	23.0	(10.4)	4.5 (2.0)
1-1/8	39.3	(17.8)	7.8 (3.5)
1-3/8	59.8 (27.1		11.8 (5.4)
1-5/8		-	16.7 (7.6)

Table 17 Indoor water/glycol cooled module – R-407C refrigerant charge

Model 60 Hz	Charge / Circuit, lb(kg)
Liebert XDC 160	30.0 (13.2) per circuit

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