Aire-Flo 42 설치 지침 매뉴얼 - 페이지 8

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STEP 2 -- REFRIGERANT PIPING -- Installing Indoor Expansion Valve

This outdoor unit is designed for use in systems that use either an fixed orifice (RFC) (included with outdoor unit), or

expansion valve metering device (purchased separately) at the indoor coil. The expansion valve unit can be installed

internal or external to the indoor coil. In applications where an uncased coil is being installed in a field-provided plenum,

install the expansion valve in a manner that will provide access for field servicing of the expansion valve. Refer to below

illustration for reference during installation of expansion valve unit. After installation of the indoor coil metering device,

proceed to Step 5.

INDOOR EXPANSION VALVE INSTALLATION

TWO-PIECE

(Uncased Coil Shown)

PATCH PLATE

(UNCASED

LIQUID LINE

COIL ONLY)

ORIFICE

HOUSING

DISTRIBUTOR

TUBES

DISTRIBUTOR

ASSEMBLY

MALE EQUALIZER LINE

FITTING (SEE

EQUALIZER LINE

INSTALLATION FOR

DETAILS)

Sensing bulb insulation is required if

check/expansion valve is installed external

to the coil casing. See sensing bulb

installation for bulb positioning.

EQUALIZER LINE INSTALLATION

A - Remove and discard either the flare seal cap or flare nut with

copper flare seal bonnet from the equalizer line port on the suc

tion line as illustrated in the figure below.

B - Remove the field-provided fitting that temporarily reconnected

the liquid line to the indoor unit's distributor assembly.

FLARE SEAL CAP

STUB

CHECK/

END

EXPANSION

VALVE

TEFLON

RING

TEFLON

SENSING

RING

EQUALIZER

LINE

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

SUCTION

LINE

LIQUID LINE

FLARE NUT

COPPER FLARE

SEAL BONNET

MALE BRASS EQUALIZER

LINE FITTING

SUCTION LINE

C - Install one of the provided Teflon

stubbed end of the check/expansion valve and use re

frigerant oil to lightly lubricate the connector threads

and exposed surface of the Teflon

D - Attach the stubbed end of the check/expansion valve

to the liquid line orifice housing. Finger tighten, then use

an appropriately sized wrench to turn an additional 1/2

turn clockwise as illustrated in the figure to the right, or

tighten to 20 ft-lb.

E - Place the remaining Teflon

end of the check expansion valve. Lightly lubricate

connector threads and expose surface of the Teflon

ring with refrigerant oil.

F - Attach the liquid line assembly to the check expansion

valve. Finger tighten, then use an appropriately sized

LINE

wrench to turn an additional 1/2 turn clockwise as illus

trated in the figure above or tighten to 20 ft-lb.

SENSING BULB INSTALLATION

A - Attach the suction line sensing bulb in the proper orien

tation as illustrated below using the clamp and screws

provided.

NOTE - Though it is preferred to have the sensing bulb

installed on a horizontal run of the suction line, installation on

a vertical run of piping is acceptable if necessary.

NOTE - Confirm proper thermal contact between the suction

line and check/expansion bulb before insulating the sensing

bulb.

B - Connect the equalizer line from the check/expansion

valve to the equalizer port on the suction line. Finger

tighten the flare nut, then tighten an additional 1/8 turn (7

ft-lbs) as illustrated to the right.

SUCTION LINE

BULB

SUCTION LINE

BULB

NOTE — NEVER MOUNT SENSING BULB ON BOTTOM OF LINE.

FIGURE 8

Page 8

rings around the

ring.

washer around the other

ON LINES SMALLER THAN

7/8",

MOUNT

BULB AT EITHER THE 3 OR

9 O'CLOCK POSITION.

BULB

ON 7/8" AND LARGER LINES,

MOUNT SENSING BULB AT

EITHER THE 4 OR 8 O'CLOCK

POSITION.

NEVER

THE

SENSING

BOTTOM OF LINE.

BULB

1/2 Turn

11 12

1/8 Turn

11 12

SENSING

MOUNT

BULB