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

 

VACUUM PUMP

 

C MICRON

GAUGE

TO VAPOR

SERVICE VALVE

TO LIQUID LINE

SERVICE VALVE

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EVACUATE THE SYSTEM

RECOMMEND

A Open both manifold valves and start the vacuum pump.

MINIMUM 3/8" HOSE

 

 

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 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 13. Evacuating System

Page 18

506636−01

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Image 18
Lenox XC14, Elite Series installation instructions Evacuating Line Set and Indoor Coil, Evacuating System
Page 17 Page 19

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