Lennox XP16 User manual

Page 1

6/2013 506640-01

*2P62013* *P506640-01*

E2013 Lennox Industries Inc.

Dallas, Texas, USA

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

WARNING

The State of California has determined that this product

may contain or produce a chemical or chemicals, in very

low doses, which may cause serious illness or death. It

may also cause cancer, birth defects, or reproductive

harm.

General

This XP16 outdoor heat pump is designed for use with

HFC-410A refrigerant only. This unit must be installed with

an approved indoor air handler or coil. See the Lennox

XP16 Product Specifications bulletin (EHB) for approved

indoor component match ups.

These instructions are intended as a general guide and do

not supersede local codes in any way. Consult authorities

having jurisdiction before installation.

INSTALLATION

INSTRUCTIONS

Elite®Series XP16 Units

HEAT PUMP

506640-01

6/2013

Supersedes 7/2012

WARNING

Improper installation, adjustment, alteration, service or

maintenance can cause property damage, personal inju

ry or loss of life.

Installation and service must be performed by a licensed

professional installer (or equivalent) or service agency.

CAUTION

Before attempting to perform any service or mainte

nance, turn the electrical power to unit OFF at discon

nect switch.

NOTICE !

For more in-depth information, consult the Installa

tion and Service Procedures manual, available as

Corp. 0626-L5 on DaveNet or through the Technical

Support department at 800-453-6669.

STEP 1 -- SETTING THE UNIT -- Clearances

ÍÍÍÍÍÍÍÍÍÍÍÍÍ

See

NOTES

See NOTES

NOTES:

Service clearance of 30 in. must be maintained on one of the sides

adjacent to the control box.

Clearance to one of the other three sides must be 36 in.

Clearance to one of the remaining two sides may be 12 in. and the

final side may be 6 in..

A clearance of 24 in. must be maintained

between two units.

48 in. clearance required on top of unit.

See

NOTES

See NOTES Control

Box

FIGURE 1

Litho U.S.A.

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Page 2

UNIT DIMENSIONS - INCHES (MM)

ELECTRICAL

INLETS

SIDE VIEW

DISCHARGE AIR

VAPOR LINE

CONNECTION

LIQUID LINE

CONNECTION

4-1/4

(108)

4-3/4

(121)

1 (25)

2 (51)

SIDE VIEW

UNIT SUPPORT

FEET

8-1/2

(216) D

XP16-024 BASE SECTION

8-3/4

(222)

5-1/2

(140)

9-1/2

(241)

8-1/4

(210)

13-1/2

(343)

UNIT SUPPORT FEET

XP16 BASE WITH LEGS

Mode Number A B C D E F G H J K

XP16-024-230 35 (889) 27 (686) 28 (711) -------

XP16-036-230 39 (991) 30-1/2 (775) 35 (889) 13-7/8 (352) 7-3/4 (197) 3-1/4 (83) 27-1/8 (689) 3-5/8 (92) 4-1/2 (114) 20-5/8 (524)

XP16-048-230 35 (889) 35-1/2 (902) 39-1/2

(1003)

16-7/8 (429) 8-3/4 (222) 3-1/8 (79) 30-3/4 (781) 4-5/8 (117) 3-3/4 (95) 26-7/8 (683)

XP16-060-230 45 (1143 35-1/2 (902) 39-1/2

(1003)

STEP 1 -- SETTING THE UNIT (Continued)

-- Unit Placement

NOTICE !

Roof Damage!

This system contains both refrigerant and oil. Some

rubber roofing material may absorb oil, causing the

rubber to degrade. Failure to follow this notice

could result in damage to roof surface.

WARNING

To prevent personal injury, as well as damage to panels,

unit or structure, observe the following:

While installing or servicing this unit, carefully stow all

removed panels so that the panels will not cause injury

to personnel, objects or nearby structures. Also, take

care to store panels where they will not be subject to

damage (e.g., being bent or scratched).

While handling or stowing the panels, consider any

weather conditions (especially wind) that may cause

panels to be blown around and damaged.

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XP16 SERIES

CAUTION

As with any mechanical equipment, contact with sharp

sheet metal edges can result in personal injury. Take

care while handling this equipment.

IMPORTANT !

Exhaust vents from dryers, water heaters and

furnaces should be directed away from the outdoor

unit. Prolonged exposure to exhaust gases and the

chemicals contained within them may cause

condensation to form on the steel cabinet and other

metal components of the outdoor unit. This will

diminish unit performance and longevity.

PLACEMENT

TWO 90° ELBOWS INSTALLED IN LINE SET

WILL REDUCE LINE SET VIBRATION.

Install unit away from windows.

FIGURE 2

Install unit level or, if on a slope, maintain slope tolerance of 2 degrees

(or 2 inches per 5 feet [50 mm per 1.5 m]) away from building structure.

SLAB MOUNTING

MOUNTING

SLAB

BUILDING

STRUCTURE

GROUND LEVEL

FIGURE 3

LEG DETAIL

BASE

2” (50.8MM) SCH 40

FEMALE THREADED

ADAPTER

ELEVATED SLAB MOUNTING USING FEET

EXTENDERS

2” (50.8MM)

SCH 40 MALE

THREADED

ADAPTER

Use additional 2” SCH 40 male

threaded adapters which can

be threaded into the female

threaded adapters to make

additional adjustments to the

level of the unit.

FIGURE 4

Unit Stabilizer Bracket Use

(field-provided):

Always use stabilizers when unit is raised

above the factory height.

(Elevated units could become unstable in

gusty wind conditions.)

Stabilizers may be used on any unit installed

on unstable and uneven surfaces.

Concrete slab — use two

plastic anchors (hole drill 1/4”)

COIL

BASE PAN

CORNER POST

STABILIZING BRACKET

(18 GAUGE METAL — 2”

WIDTH; HEIGHT AS

REQUIRED)

#10 X 1/2” LONG

SELF-DRILLING

SHEET METAL

SCREWS

#10 X 1-1/4” LONG

HEX HD SCREW AND

FLAT WASHER

STABILIZING UNIT ON UNEVEN SURFACES

!IMPORTANT !

FIGURE 5

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STEP 2 -- REFRIGERANT PIPING -- Flush

ing Existing Line Set & Indoor Coil

Flush the existing line set per the following instruc

tions. For more information, refer to the Installation

and Service Procedures manual available on Dave

Net. CAUTION -DO NOT attempt to flush and re-use ex

isting line sets or indoor coil when the system con

tains contaminants (i.e., compressor burn out).

NOTE - When installing refrigerant lines longer than 50

feet, refer to the Refrigerant Piping Design and Fabrication

Guidelines manual available on DaveNet (Corp. 9351-L9),

or contact the Technical Support Department Product Ap

plication group for assistance.

NOTE - For new or replacement line set installation, refer

to Service and Application Note - Corp. 9112-L4 (C-91-4).

TABLE 1

REFRIGERANT LINE SET — INCHES (MM)

Model

Field Connec

tions Recommended Line Set

Liquid

Line

Suction

Line

Liquid

Line

Suction

Line L15 Line Set

-024

3/8”

(10

mm)

3/4” (19

mm)

3/8”

(10

mm)

3/4” (19

mm)

L15-41 — 15 ft. -

50 ft. (4.6m - 15

-036 3/8”

(10

mm)

7/8” (22

mm)

3/8”

(10

mm)

7/8” (22

mm)

L15-65 — 15 ft. -

50 ft. (4.6 m - 15

-048

-060

3/8”

(10

mm)

1-1/8”

(29

mm)

3/8”

(10

mm)

1-1/8”

(29

mm)

Field Fabricated

NOTE — Some applications may required a field provided 7/8” to

1-1/8” adapter

IMPORTANT !

If this unit is being matched with an approved line

set or indoor unit coil that was previously charged

with mineral oil, or if it is being matched with a coil

which was manufactured before January of 1999,

the coil and line set must be flushed prior to installa

tion. Take care to empty all existing traps. Polyol es

ter (POE) oils are used in Lennox units charged with

HFC-410A refrigerant. Residual mineral oil can act

as an insulator, preventing proper heat transfer. It

can also clog the expansion device and reduce sys

tem performance and capacity.

Failure to properly flush the system per this instruc

tion and the detailed Installation and Service Proce

dures manual will void the warranty.

WARNING

When using a high pressure gas such as

nitrogen to pressurize a refrigeration or air

conditioning system, use a regulator that

can control the pressure down to 1 or 2

psig (6.9 to 13.8 kPa).

WARNING

Refrigerant can be harmful if it is inhaled. Refrigerant

must be used and recovered responsibly.

Failure to follow this warning may result in personal injury

or death.

WARNING

Fire, Explosion and Personal Safety Haz

ard. Failure to follow this warning could re

sult in damage, personal injury or death.

Never use oxygen to pressurize or purge

refrigeration lines. Oxygen, when exposed

to a spark or open flame, can cause fire

and/or an explosion, that could result in

property damage, personal injury or death.

WARNING

Polyol ester (POE) oils used with HFC-410A

refrigerant absorb moisture very quickly. It is very

important that the refrigerant system be kept closed

as much as possible. DO NOT remove line set caps

or service valve stub caps until you are ready to make

connections.

IMPORTANT !

Some scroll compressors have an internal vacuum

protector that will unload scrolls when suction pres

sure goes below 20 psig. A hissing sound will be

heard when the compressor is running unloaded.

Protector will reset when low pressure in system is

raised above 40 psig. DO NOT REPLACE COM

PRESSOR.

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XP16 SERIES

STEP 2 -- REFRIGERANT PIPING -- Removing Existing Indoor Metering Device

SENSING

LINE

TEFLON®RING

FIXED ORIFICE

BRASS NUT

LIQUID LINE ASSEMBLY

(INCLUDES STRAINER)

LIQUID LINE ORIFICE HOUSING

DISTRIBUTOR TUBES

DISTRIBUTOR

ASSEMBLY

REMOVE AND DISCARD

WHITE TEFLON®SEAL

(IF PRESENT)

A. On fully cased coils, remove the coil access and plumbing panels.

B. Remove any shipping clamps from the liquid line and distributor as

sembly.

C. Using two wrenches, disconnect liquid line from liquid line orifice hous

ing. Take care not to twist or damage distributor tubes during this pro

cess.

D. Remove and discard fixed orifice, valve stem assembly (if present)

and Teflon®washer as illustrated above.

E. Use a field-provided fitting to temporarily reconnect the liquid line to the

indoor unit's liquid line orifice housing.

TYPICAL EXISTING FIXED ORIFICE

REMOVAL PROCEDURE

(UNCASED COIL SHOWN)

TYPICAL EXISTING EXPANSION VALVE REMOVAL

PROCEDURE (UNCASED COIL SHOWN)

TWO-PIECE PATCH PLATE

(UNCASED COIL ONLY)

VAPOR

LINE

DISTRIBUTOR

ASSEMBLY

DISTRIBUTOR

TUBES

LIQUID

LINE

MALE EQUALIZER

LINE FITTING

EQUALIZER

LINE

CHECK

EXPANSION

VALVE

TEFLON®

RING

STUB END

TEFLON®

RING

SENSING BULB

LIQUID LINE

ORIFICE

HOUSING

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

A. On fully cased coils, remove the coil access and plumbing panels.

B. Remove any shipping clamps from the liquid line and distributor

assembly.

C. Disconnect the equalizer line from the check expansion valve

equalizer line fitting on the vapor line.

D. Remove the vapor line sensing bulb.

E. Disconnect the liquid line from the check expansion valve at the

liquid line assembly.

F. Disconnect the check expansion valve from the liquid line orifice

housing. Take care not to twist or damage distributor tubes during

this process.

G. Remove and discard check expansion valve and the two Teflon®

rings.

H. Use a field-provided fitting to temporarily reconnect the liquid line to

the indoor unit's liquid line orifice housing.

LOW HIGH

EXISTING

INDOOR

UNIT

GAUGE

MANIFOLD

CYLINDER CONTAINING

CLEAN HCFC-22 TO BE USED

FOR FLUSHING

(Positioned to deliver liquid

refrigerant)

LIQUID LINE SERVICE

VALVE

INLET

DISCHARGE

TANK

RETURN

CLOSED

OPENED

RECOVERY

CYLINDER

RECOVERY MACHINE

NEW

OUTDOOR

UNIT

VAPOR LINE

SERVICE VALVE

VAPOR

LIQUID

A. HCFC-22 cylinder with clean refrigerant (positioned to deliver liquid

refrigerant) to the vapor service valve.

B. HCFC-22 gauge set (low side) to the liquid line valve.

C. HCFC-22 gauge set center port to inlet on the recovery machine with an

empty recovery tank connected to the gauge set.

D. Connect recovery tank to recovery machine per machine instructions.

CONNECT GAUGES AND EQUIPMENT FOR

FLUSHING PROCEDURE

FLUSHING LINE SET

A. Set the recovery machine for liquid recovery and start the recovery

machine. Open the gauge set valves to allow the recovery

machine to pull a vacuum on the existing system line set and indoor

unit coil.

B. Position the cylinder of clean HCFC-22 for delivery of liquid

refrigerant and open its valve to allow liquid refrigerant to flow into

the system through the vapor line valve. Allow the refrigerant to

pass from the cylinder and through the line set and the indoor unit

coil before it enters the recovery machine.

C. After all of the liquid refrigerant has been recovered, switch the

recovery machine to vapor recovery so that all of the HCFC-22

vapor is recovered. Allow the recovery machine to pull the system

down to 0.

D. Close the valve on the inverted HCFC-22 drum and the gauge set

valves. Pump the remaining refrigerant out of the recovery

machine and turn the machine off.

The line set and indoor unit coil must be flushed with at least the same

amount of clean refrigerant that previously charged the system. Check

the charge in the flushing cylinder before proceeding.

FIGURE 6

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STEP 2 -- REFRIGERANT PIPING -- Brazing Procedures

ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE

VALVES

OUTDOOR

UNIT

LIQUID LINE

VAPOR LINE

LIQUID LINE SERVICE

VALVE

SUCTION /

VAPOR LINE

SERVICE

VALVE

ATTACH

GAUGES

INDOOR

UNIT

SUCTION / VAPOR SERVICE PORT MUST BE

OPEN TO ALLOW EXIT POINT FOR NITROGEN

A. Connect gauge set low pressure side to

liquid line service valve (service port).

B. Connect gauge set center port to bottle of

nitrogen with regulator.

C. Remove core from valve in suction / vapor

line service port to allow nitrogen to escape.

NITROGEN

HIGHLOW

USE REGULATOR TO FLOW

NITROGEN AT 1 TO 2 PSIG.

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

Flow regulated nitrogen (at 1 to 2 psig) through the low-side refrigeration gauge set into the liquid line service port valve, and out of the suction /

vapor line service port valve.

CUT AND DEBUR CAP AND CORE REMOVAL

Cut ends of the refrigerant lines square (free from nicks or dents)

and debur the ends. The pipe must remain round. Do not crimp end

of the line.

Remove service cap and core from

both the suction / vapor and liquid line

service ports.

LIQUID LINE SERVICE

VALVE

SERVICE

PORT

CORE

SERVICE PORT

CAP

SERVICE

PORT

CORE

SERVICE

PORT CAP

CUT AND DEBUR

LINE SET SIZE MATCHES

SERVICE VALVE CONNECTION

COPPER TUBE

STUB

SERVICE VALVE

CONNECTION

REFRIGERANT LINE

DO NOT CRIMP SERVICE VALVE

CONNECTOR WHEN PIPE IS

SMALLER THAN CONNECTION

REDUCER

SUCTION / VAPOR LINE

SERVICE VALVE

LINE SET SIZE IS SMALLER

THAN CONNECTION

FIGURE 7

CAUTION

Brazing alloys and flux contain materials which are

hazardous to your health.

Avoid breathing vapors or fumes from brazing

operations. Perform operations only in well-ventilated

areas.

Wear gloves and protective goggles or face shield to

protect against burns.

Wash hands with soap and water after handling brazing

alloys and flux.

WARNING

Danger of fire. Bleeding the refrigerant

charge from only the high side may result

in pressurization of the low side shell and

suction tubing. Application of a brazing

torch to a pressurized system may result

in ignition of the refrigerant and oil

mixture. Check the high and low

pressures before applying heat.

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XP16 SERIES

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

LIQUID LINE SERVICE VALVE

LIQUID LINE

BRAZE LINE SET

Wrap both service valves with water-saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Cloths must

remain water-saturated throughout the brazing and cool-down process.

WATER-SATURATED

CLOTH

IMPORTANT — Allow braze joint to cool. Apply

additional water-saturated cloths to help cool brazed

joint. Do not remove water-saturated cloths until

piping has cooled. Temperatures above 250ºF will

damage valve seals.

SUCTION / VAPOR LINE

WATER-SATURATED

CLOTH

SUCTION / VAPOR LINE

SERVICE VALVE

After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water-saturated cloths to both

services valves to cool piping. Once piping is cool, remove all water-saturated cloths.

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

PREPARATION FOR NEXT STEP

WRAP SERVICE VALVES

To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use

additional water-saturated cloths underneath the valve body to protect the base paint.

FLOW NITROGEN

Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and

out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections.

WARNING

FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE

may result if you do not wrap a water-saturated cloth around

both liquid and suction line service valve bodies and copper

tube stub while brazing the line set! The braze, when

complete, must be quenched with water to absorb any

residual heat.

Do not open service valves until refrigerant lines and

indoor coil have been leak-tested and evacuated. Refer

to Installation and Service Procedures manual found on

DAVENET.

FIGURE 7 (CONTINUED)

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STEP 3 -- INSTALLING INDOOR EXPANSION VALVE

This outdoor unit is designed for use in systems that include an check/expansion valve metering device. See the XP16

Product Specifications bulletin (EHB) for approved check/expansion valve kit match-ups and application information. The

check/expansion valve 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 check/expansion valve in a manner that will provide access for future field

service of the check expansion valve. Refer to below illustration for reference during installation of check/expansion valve.

A. Attach the vapor line sensing bulb in the proper

orientation as illustrated to the right using the clamp and

screws provided.

NOTE — Confirm proper thermal contact between vapor line

and check expansion bulb before insulating the sensing bulb

once installed.

B. Connect the equalizer line from the check expansion

valve to the equalizer vapor port on the vapor line. Finger

tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated

below.

TWO PIECE

PATCH PLATE

(UNCASED

COIL ONLY)

VAPOR

LINE

LIQUID LINE

ORIFICE

HOUSING

DISTRIBUTOR

TUBES

LIQUID LINE

MALE EQUALIZER LINE

FITTING (SEE

EQUALIZER LINE

INSTALLATION FOR

FURTHER DETAILS)

SENSING

LINE

EQUALIZER

LINE

CHECK

EXPANSION

VALVE

TEFLON®

RING

(Uncased Coil Shown)

Sensing bulb insulation is required if

mounted external to the coil casing. sensing

bulb installation for bulb positioning.

STUB

END

TEFLON®

RING

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

DISTRIBUTOR

ASSEMBLY

C. Install one of the provided Teflon®rings around the

stubbed end of the check expansion valve and lightly

lubricate the connector threads and expose surface of

the Teflon®ring with refrigerant oil.

D. Attach the stubbed end of the check expansion valve to

the liquid line orifice housing. Finger tighten and use an

appropriately sized wrench to turn an additional 1/2 turn

clockwise as illustrated in the figure above, or tighten to

20 ft-lb.

E. Place the remaining Teflon®washer around the other

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 and use an appropriately sized

wrench to turn an additional 1/2 turn clockwise as

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

ON 7/8” AND LARGER LINES,

MOUNT SENSING BULB AT

EITHER THE 4 OR 8 O'CLOCK

POSITION. NEVER MOUNT

THE SENSING BULB ON

BOTTOM OF LINE.

ON LINES SMALLER THAN

7/8”, MOUNT SENSING

BULB AT EITHER THE 3 OR

9 O'CLOCK POSITION.

BULB

VAPOR LINE

NOTE — NEVER MOUNT THE SENSING BULB

ON BOTTOM OF LINE.

BULB

VAPOR LINE

FLARE NUT

COPPER FLARE

SEAL BONNET

MALE BRASS EQUALIZER

LINE FITTING

FLARE SEAL CAP

11 12

1/2 Turn

SENSING BULB INSTALLATION

EQUALIZER LINE INSTALLATION

11 12

1/8 Turn

A. Remove and discard either the flare seal cap or flare nut

with copper flare seal bonnet from the equalizer line port

on the vapor line as illustrated in the figure to the right.

B. Remove the field-provided fitting that temporarily recon

nected the liquid line to the indoor unit's distributor assemb

ly.

INDOOR EXPANSION VALVE INSTALLATION

FIGURE 8

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XP16 SERIES

STEP 4 -- LEAK TEST AND EVACUATION

TO VAPOR

SERVICE VALVE

HFC-410A

MANIFOLD GAUGE SET

OUTDOOR UNIT

HIGHLOW

CONNECT GAUGE SET

AConnect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port.

NOTE — Normally, the high pressure hose is connected to the liquid line port. However, connecting it

to the vapor port better protects the manifold gauge set from high pressure damage.

BWith both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of

the manifold gauge set.

NOTE — Later in the procedure, the HFC-410A container will be replaced by the nitrogen container.

TEST FOR LEAKS

After the line set has been connected to the indoor and outdoor units, check the line set connections

and indoor unit for leaks. Use the following procedure to test for leaks:

AWith both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of

the manifold gauge set. Open the valve on the HFC-410A cylinder (vapor only).

BOpen the high pressure side of the manifold to allow HFC-410A into the line set and indoor unit.

Weigh in a trace amount of HFC-410A. [A trace amount is a maximum of two ounces (57 g) refriger

ant or three pounds (31 kPa) pressure.] Close the valve on the HFC-410A cylinder and the valve on

the high pressure side of the manifold gauge set. Disconnect the HFC-410A cylinder.

CConnect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold

gauge set.

DAdjust nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge

set in order to pressurize the line set and the indoor unit.

EAfter a few minutes, open one of the service valve ports and verify that the refrigerant added to the

system earlier is measurable with a leak detector.

FAfter leak testing, disconnect gauges from service ports.

NITROGEN

NOTE - Position

canister to deliver

liquid refrigerant.

FIGURE 9

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Page 10

STEP 4 -- LEAK TEST AND EVACUATION (Continued)

AOpen both manifold valves and start the vacuum pump.

BEvacuate 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.

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

perform the following:

SClose manifold gauge valves.

SClose valve on vacuum pump.

STurn off vacuum pump.

SDisconnect manifold gauge center port hose from vacuum pump.

SAttach manifold center port hose to a nitrogen cylinder with pressure

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

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

unit.

SClose manifold gauge valves.

DShut 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.

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 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.

GPerform 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.

OUTDOOR

UNIT

TO VAPOR

SERVICE VALVE

TO LIQUID LINE

SERVICE VALVE

MICRON

GAUGE

VACUUM PUMP

1/4 SAE TEE WITH SWIVEL

COUPLER

500

MANIFOLD

GAUGE SET

HFC-410A

RECOMMEND

MINIMUM 3/8” HOSE

AConnect low side of manifold gauge set with

1/4 SAE in-line tee to vapor line service valve

BConnect high side of manifold gauge set to

liquid line service valve

CConnect available micron gauge connector

on the 1/4 SAE in-line tee.

DConnect 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.

HIGH

LOW

11 12

1/6 TURN

NITROGEN

3CONNECT GAUGE SET

4EVACUATE THE SYSTEM

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

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.

WARNING !

NOTE - Position

canister to deliver

liquid refrigerant.

EVACUATION

FIGURE 10

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