Aire-Flo 24 Instrukcja instalacji - Strona 10

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STEP 3 -- LEAK TEST AND EVACUATION (CONTINUED)

CONNECT GAUGE SET

NOTE - Remove cores from service valves (if not already done).

A - Connect low side of manifold gauge set with

1/4 SAE in-line tee to suction 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

HFC-410A

EVACUATE THE SYSTEM

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 - During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure

indicates a relatively large leak. If this occurs, repeat the leak testing procedure.

NOTE - The term absolute pressure means the total actual pressure above absolute 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:

●

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 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.

●

Close 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:

●

Close manifold gauge valves.

●

Shut off HFC-410A cylinder.

●

Reinstall service valve cores by removing manifold hose from service valve. Quickly

install cores with core tool while maintaining a positive system pressure.

●

Replace stem caps and finger tighten them, then tighten an additional one-sixth (1/6)

of a turn as illustrated.

EVACUATION

OUTDOOR

UNIT

VACUUM PUMP

1/4 SAE TEE WITH SWIVEL

COUPLER

500

Possible equipment damage.

Avoid deep vacuum operation. Do not use

compressors to evacuate a system.

Extremely low vacuum can cause internal

arcing and compressor failure. Damage

caused by deep vacuum operation will

void warranty.

FIGURE 10

Page 10

LOW

MANIFOLD

GAUGE SET

TO SUCTION

MICRON

SERVICE VALVE

GAUGE

TO LIQUID LINE

SERVICE VALVE

RECOMMEND

MINIMUM 3/8" HOSE

WARNING !

1/6 TURN

HIGH