Lennox 13HPX User manual

Page 1

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.

NOTICE !

For more in-depth information, consult the Installa

tion and Service Procedures manual, available as

Corp. 0619-L4 on DaveNet or through the Technical

Support department at 800-453-6669.

INSTALLATION

INSTRUCTIONS

Merit®Series 13HPX Units

HEAT PUMP

506727-01

3/2014

Supersedes 6/2013

GENERAL

This 13HPX 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

13HPX Product Specifications bulletin 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.

WARNING

Improper installation, adjustment, alteration, service or

maintenance can cause personal injury, loss of life, or

damage to property.

Installation and service must be performed by a licensed

HVAC professional installer (or equivalent) or a service

agency.

STEP 1 -- SETTING THE UNIT -- CLEARANCES

NOTES:

Service clearance of 30 in. (762 mm) 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. (914

mm)

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

(305 mm) and the final side may be 6 in. (152 mm).

A clearance of 24 in. must be maintained between two units.

48 in. (1219 mm) clearance required on top of unit.

See

NOTES

See NOTES

See

NOTES

CONTROL

BOX

FIGURE 1

Litho U.S.A.

Page 2

SIDE

VIEW

UNIT DIMENSIONS - INCHES (MM)

FIGURE 2

TABLE 1

UNIT DIMENSIONS

Model No. A B

13HPX-018-230 24-1/4 (616) 33-1/4 (845)

13HPX-024-230 24-1/4 (616) 33-1/4 (845)

13HPX-030-230 28-1/4 (718) 29-1/4 (743)

13HPX-036-230 28-1/4 (718) 37-1/4 (946)

13HPX-042-230 28-1/4 (718) 43-1/4 (1099)

13HPX-048-230 28‐1/4 (718) 33-1/4 (845)

13HPX-060-230 28‐1/4 (718) 37-1/4 (946)

STEP 1 -- SETTING THE UNIT

(CONTINUED) -- Unit Placement

CAUTION

As with any mechanical equipment, contact with sharp

sheet metal edges can result in personal injury. Take care

while handling this equipment.

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.

CAUTION

Before attempting to perform any service or maintenance,

turn the electrical power to unit OFF at disconnect switch.

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 noticecould

result in damage to roof surface.

IMPORTANT !

This model is designed for use in check / expansion

valve systems only. An indoor expansion valve ap

proved for use with HFC-410A refrigerant must be or

dered separately and installed prior to operating the

system.

IMPORTANT !

Exhaust vents from dryers, water heaters and furnaces

should be directed away from the outdoor unit. Pro

longed 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.

INSTALL UNIT AWAY

FROM WINDOWS

TWO 90_ELBOWS INSTALLED IN LINE SET

WILL REDUCE LINE SET VIBRATION

PLACEMENT

FIGURE 3

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.

GROUND LEVEL

MOUNTING

SLAB

BUILDING

STRUCTURE DISCHARGE AIR

SLAB MOUNTING

FIGURE 4

Page 3

13HPX SERIES

STEP 2 -- REFRIGERANT PIPING -- Flush

ing Existing Line Set and Indoor Coil

Flush the existing line set per the following

instructions. For more information, refer to the

Installation and Service Procedures manual available

on DaveNet. CAUTION - DO NOT attempt to flush and

re-use existing line sets or indoor coil when the system

contains 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

Application group for assistance.

TABLE 2

REFRIGERANT LINE SET — INCHES (MM)

Model

Field

Connections Recommended Line Set

Liquid

Line

Vapor

Line

Liquid

Line

Vapor

Line L15 Line Sets

-018

3/8 in.

(10

mm)

3/4 in.

(19

mm)

3/8 in.

(10

mm)

3/4 in.

(19

mm)

L15-41 — 15 ft. -

50 ft. (4.6 m - 15

-024

-030

-036

-042 3/8 in.

(10

mm)

7/8 in.

(22

mm)

3/8 in.

(10

mm)

7/8 in.

(22

mm)

L15-65 — 15 ft. -

50 ft. (4.6 m - 15

-048

-060

3/8 in.

(10

mm)

1-1/8

in. (29

mm)

3/8 in.

(10

mm)

1-1/8

in. (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 installation. Take

care to empty all existing traps. Polyol ester (POE)

oils are used in Lennox units charged with HFC-410A

refrigerant. Residual mineral oil can act as an insula

tor, preventing proper heat transfer. It can also clog

the expansion device and reduce system perfor

mance 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 re

frigeration 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 COMPRES

SOR.

Page 4

ANCHORED HEAVY NYLON

WIRE TIE OR AUTOMOTIVE

MUFFLER‐TYPE HANGER

STRAP LIQUID LINE TO

VAPOR LINE

WALL

STUD

LIQUID LINE

NON-CORROSIVE

METAL SLEEVE

VAPOR LINE - WRAPPED

IN ARMAFLEX

AUTOMOTIVE

MUFFLER‐TYPE HANGER

REFRIGERANT LINE SET — TRANSITION

FROM VERTICAL TO HORIZONTAL

Line Set Isolation — The following illustrations are

examples of proper refrigerant line set isolation:

STRAPPING

MATERIAL (AROUND

VAPOR LINE ONLY)

TAPE OR

WIRE TIE

WIRE TIE (AROUND

VAPOR LINE ONLY)

FLOOR JOIST OR

ROOF RAFTER

TAPE OR

WIRE TIE

To hang line set from joist or rafter, use either metal strapping material

or anchored heavy nylon wire ties.

8 FEET (2.43 METERS)

STRAP THE VAPOR LINE TO THE JOIST

OR RAFTER AT 8 FEET (2.43 METERS)

INTERVALS THEN STRAP THE LIQUID

LINE TO THE VAPOR LINE.

FLOOR JOIST OR

ROOF RAFTER

REFRIGERANT LINE SET — INSTALLING

HORIZONTAL RUNS

NOTE — Similar installation practices should be used if line set is

to be installed on exterior of outside wall.

PVC

PIPE

FIBERGLASS

INSULATION

CAULK

OUTSIDE

WALL

VAPOR LINE WRAPPED

WITH ARMAFLEX

LIQUID

LINE

OUTSIDE WALL LIQUID LINE

VAPOR LINE

WOOD BLOCK

BETWEEN STUDS

STRAP

WOOD BLOCK

STRAP

SLEEVE

WIRE TIE

INSIDE WALL

REFRIGERANT LINE SET — INSTALLING

VERTICAL RUNS (NEW CONSTRUCTION SHOWN)

LINE SET INSTALLATION

NOTE — Insulate liquid line when it is routed through areas where the

surrounding ambient temperature could become higher than the

temperatureof the liquid line or when pressure drop is equal to or greater

than 20 psig.

NON-CORROSIVE

METAL SLEEVE

IMPORTANT — Refrigerant lines must not contact structure.

NON-CORROSIVE

METAL SLEEVE

8 FEET (2.43 METERS)

IMPORTANT — Refrigerant lines must not contact wall

FIGURE 5

Page 5

13HPX 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

Page 6

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.

ANGLE-TYPE 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

BALL-TYPE 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.

Page 7

13HPX 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 8

Page 8

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

This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at

the indoor coil. See the 13HPX Product Specifications bulletin (EHB) for approved expansion valve kit match ups. 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.

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

DETAILS)

SENSING

LINE

EQUALIZER

LINE

CHECK/

EXPANSION

VALVE

TEFLON®

RING

(Uncased Coil Shown)

Sensing bulb insulation is required if

check/expansion valve is installed external

to the coil casing. See sensing bulb

installation for bulb positioning.

STUB

END

TEFLON®

RING

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

DISTRIBUTOR

ASSEMBLY

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

123

11 12

1/2 Turn

SENSING BULB INSTALLATION

EQUALIZER LINE INSTALLATION

123

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 below.

B. Remove the field-provided fitting that temporarily reconnected

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

INDOOR EXPANSION VALVE INSTALLATION

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

stubbed end of the check/expansion valve and use re

frigerant oil to lightly lubricate the connector threads

and exposed surface of the Teflon®ring.

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®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, then use an appropriately sized

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

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

A. Attach the vapor line sensing bulb in the proper orienta

tion as illustrated below using the clamp and screws

provided.

B. NOTE - Though it is preferred to have the sensing bulb

installed on a horizontal run of the vapor line, installation

on a vertical run of piping is acceptable if necessary.

NOTE — Confirm proper thermal contact between vapor line

and check/expansion bulb before insulating the sensing bulb.

C. Connect the equalizer line from the check/expansion

valve to the equalizer vapor port on the vapor line. Fin

ger tighten the flare nut, then tighten an additional 1/8

turn (7 ft-lbs) as illustrated to the right.

FIGURE 9

Page 9

13HPX SERIES

STEP 3 -- LEAK TEST AND EVACUATION

A. With 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).

B. Open 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) refrigerant 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.

C. Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge

set.

D. Adjust 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.

E. After 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.

F. After leak testing, disconnect gauges from service ports.

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:

A. Connect 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.

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

the manifold gauge set.

1CONNECT GAUGE SET

TEST FOR LEAKS

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

by the nitrogen container.

LEAK TEST

TO VAPOR

SERVICE VALVE

(ANGLE OR BALL

TYPE)

HFC-410A

MANIFOLD GAUGE SET

OUTDOOR UNIT

HIGH

LOW

NITROGEN

FIGURE 10

Page 10

STEP 3 -- LEAK TEST AND EVACUATION (CONTINUED)

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:

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.

1011 12

1/6 TURN

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 !

EVACUATION

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.

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

HIGH

LOW

NITROGEN

FIGURE 11

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