Evacuating Line Set and Indoor Coil

CONNECT GAUGE SET

1NOTEA Connect low side of manifold gauge set with 1/4 SAE in−line tee to vapor line service valve

B Connect high side of manifold gauge
	set to liquid line service valve				OUTDOOR
C	Connect	micron	gauge	available	UNIT
					A
	connector on the 1/4 SAE in−line tee.
D Connect		the vacuum pump (with
	vacuum gauge) to the center port of the
	manifold gauge set. The center port

A34000 1/4 SAE TEE WITH SWIVEL COUPLER

500

LOW HIGH

MANIFOLD

GAUGE SET

line will be used later for both the
HFC−410A and nitrogen containers.
NITROGEN
HFC−410A	B
	B
VACUUM PUMP

C MICRON

GAUGE

TO VAPOR

SERVICE VALVE

TO LIQUID LINE

SERVICE VALVE

			D
			D

EVACUATE THE SYSTEM				RECOMMEND
A Open both manifold valves and start the vacuum pump.				MINIMUM 3/8" HOSE
A Open both manifold valves and start the vacuum pump.
2 B Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).
	NOTE				ure
	indicates a relatively large leak. If this occurs, repeat the leak testing procedure.
	NOTE	absolute pressure means the total actual pressure within a given volume or system, above the absolute zero of

pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.

CWhen the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following:

S S S S S S

Close manifold gauge valves

Close valve on vacuum pump

Turn off vacuum pump

Disconnect the manifold gauge center port hose from vacuum pump

Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose.

Open manifold gauge valves to break the vacuum in the line set and indoor unit.

SClose manifold gauge valves.

DShut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the dry nitrogen from the line set and indoor unit.

EReconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20−minute period after shutting off the vacuum pump and closing the manifold gauge valves.

FWhen the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to an upright cylinder of HFC−410A refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and indoor unit.

GPerform the following:

1/6 TURN

SClose manifold gauge valves.

S	Shut off HFC−410A cylinder.		11	12	1
S	Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core	10			2

		9			3
	tool while maintaining a positive system pressure.
		8			4
S	Replace stem caps and secure finger tight, then tighten an additional one−sixth (1/6) of a turn as illustrated.		7
				6	5

Figure 12. Evacuating System

Page 18

506637−01 11/10

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Lenox 506637-01 installation instructions Evacuating Line Set and Indoor Coil, Evacuating System

Models: Elite Series X16 Air Conditioner Units 506637-01