STEP 4 −− LEAK TEST AND EVACUATION (Continued)

EVACUATION

3CONNECT GAUGE SET

NOTE

LOW HIGH

A.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

C.Connect available micron gauge 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 line will be used later for both the HFC−410A and nitrogen containers.

NITROGEN

NOTE − Position canister to deliver liquid refrigerant.

HFC−410A

OUTDOOR

UNIT

A

B

1/4 SAE TEE WITH SWIVEL COUPLER

500

C MICRON

GAUGE

MANIFOLD

GAUGE SET

TO VAPOR

SERVICE VALVE

VACUUM PUMP

TO LIQUID LINE

SERVICE VALVE

D

4 EVACUATE THE SYSTEM RECOMMEND

MINIMUM 3/8" HOSE

A.Open both manifold valves and start the vacuum pump.

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 above zero within a given volume or system. Absolute pressure in a

vacuum is equal to atmospheric pressure minus vacuum pressure.

C.When the absolute pressure reaches 23,000 microns (29.01 inches of mercury),

perform the following:

WARNING !

S Close manifold gauge valves.

 

S Close valve on vacuum pump.

Possible equipment damage.

 

S Turn off vacuum pump.

Avoid deep vacuum operation. Do not use

S Disconnect manifold gauge center port hose from vacuum pump.

compressors to evacuate a system.

S Attach manifold center port hose to a nitrogen cylinder with pressure

Extremely low vacuum can cause internal

regulator set to 150 psig (1034 kPa) and purge the hose.

arcing and compressor failure. Damage

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

caused by deep vacuum operation will

unit.

void warranty.

 

SClose manifold gauge valves.

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

E.Reconnect 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.

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

G.Perform the following:

SClose manifold gauge valves.

SShut off HFC−410A cylinder.

SReinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core tool while maintaining a positive system pressure.

SReplace stem caps and finger tighten them, then tighten an additional one−sixth (1/6) of a turn as illustrated.

 

1/6 TURN

11

12

1

10

 

2

9

 

3

84

7 6 5

FIGURE 11

Page 10

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Page 10
Image 10
Lennox International Inc XC21 Leak Test and Evacuation, LOW High, SAE TEE with Swivel Coupler, Minimum 3/8 Hose
Page 9 Page 11

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