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PRODUCT LITERATURE

¤1994 Lennox Industries Inc.

Dallas, Texas

HS23 CONDENSING UNIT

HS23 condensing units are designed for expansion

valve (TXV) and RFC systems. Refer to Lennox engi-

neeringhandbook for expansion valve kitswhichmust

be ordered separately.

SHIPPING AND PACKING LIST

1-- Assembled HS23 condensing unit

1-- Thermometer well (field installed)

1-- Filter/dryer (field installed)

Check unit for shipping damage. Consult last carrier

immediately if damage is found.

GENERAL INFORMATION

These instructions are intended as a general guide

and do not supersede national or local codes in any

way. Authorities having jurisdiction should be con-

sulted before installation.

IMPORTANT

The Clean Air Act of 1990 bans the intentionalventing of refrigerant (CFC�s and HCFC�s) as ofJuly 1, 1992. Approved methods of recovery, re-cycling or reclaiming must be followed. Finesand/or incarcerationmay be levied for non--com-pliance.

INSTALLATION

INSTRUCTIONS

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TABLE OF CONTENTS

HS23 CONDENSING UNIT 1. . . . . . . . . . . . . . . . . . . . . . . . .

SHIPPING AND PACKING LIST 1. . . . . . . . . . . . . . . . . . . . . .

GENERAL INFORMATION 1. . . . . . . . . . . . . . . . . . . . . . . . . .

HS23 UNIT DIMENSIONS 2. . . . . . . . . . . . . . . . . . . . . . . . . .

HS23 CHECK POINTS 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SETTING THE UNIT 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ELECTRICAL 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PLUMBING 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REFRIGERANT METERING DEVICE 4. . . . . . . . . . . . . . . . . .

MANIFOLD GAUGE SET 5. . . . . . . . . . . . . . . . . . . . . . . . . . .

LIQUID & SUCTION LINE SERVICE VALVES 5. . . . . . . . . .

LEAK TESTING 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EVACUATION 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

START--UP 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CHARGING CONSIDERATIONS 8. . . . . . . . . . . . . . . . . . . . .

CHARGING FOR RFC SYSTEMS 8. . . . . . . . . . . . . . . . . . . .

CHARGING FOR TXV SYSTEMS 9. . . . . . . . . . . . . . . . . . . .

SYSTEM OPERATION 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MAINTENANCE 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

WARNING

Product contains fiberglass wool.

Disturbing the insulation in this product duringinstallation, maintenance, or repair will exposeyou to fiberglass wool. Breathing this may causelung cancer. (Fiberglass wool is known to theState of California to cause cancer.)

Fiberglass woolmay also cause respiratory, skin,and eye irritation.

To reduce exposure to this substance or for fur-ther information, consult material safety datasheets available from address shown below, orcontact your supervisor.

Lennox Industries Inc.P.O. Box 799900Dallas, TX 75379--9900

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HS23 UNIT DIMENSIONS--INCHES (MM)

Model No. A B C

HS23-141, HS23-211,

HS23-26126-3/8 26-3/8 16-7/8

HS23-311, HS23-411-413 26-3/8 30-3/8 16-7/8

HS23-461-463,

HS23-511-513,

HS23-651-653

31-5/16 34-3/8 21-3/16

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B

2-3/8

2-1/2

4-3/4

1

3-1/8

TOP VIEW

SIDE VIEWFRONT VIEW

CC

INLET AIR

INLET

AIR

INLET

AIR

INLET AIR

FAN GUARD

AA

SUCTION LINE

CONNECTION

AND VALVE

LIQUID LINE

CONNECTION

AND VALVE

DISCHARGE AIR

COMPRESSOR

ELECTRICAL

CONNECTIONS

BOTTOM OF

CONTROL BOX

CONTROL

BOX

4-3/44-3/44-3/44-3/4

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SETTING THE UNIT

Refer to unit dimensions on page 2 for sizing mount-

ing slab, platforms or supports. Refer to figure 1 for

installation clearances.

INSTALLATION CLEARANCES

FIGURE 1

36

(914 mm)

*36

(914 mm)

36

(914 mm)

NOTE�48 inch clearance required on top of unit.

*NOTE�One side must be 36 inches. Two of the remainingthree sides may be 12 inches.

*36

(914 mm)

Slab Mounting

When installing unit at grade level, install on a level

slab high enough above grade to allow adequate

drainage of water. Top of slab should be located so

run--off water from higher ground will not collect

around unit.

Roof Mounting

Install unit at a minimum of 4 inches above the sur-

face of the roof. Care must be taken to ensure weight

of unit is properly distributed over roof joists and raf-

ters. Either redwood or steel supports are recom-

mended.

ELECTRICAL

Wiring must conform to current standards of the Na-

tional Electric Code (NEC), Canadian Electrical Code

(CEC) and local codes. Refer to the furnace or blower

coil installation instructions for additional wiring ap-

plication diagrams and refer to unit rating plate for

minimum circuit ampacity and maximum overcur-

rent protection size.

WARNING

Unit must be grounded in accordance with na-tional and local codes. Electric Shock Hazard.Can cause injury or death.

Line Voltage

To facilitate conduit, a hole is provided in bottom of

the control box. Connect conduit to hole in control

box with proper conduit fitting.

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24V, Class II Circuit

24V, Class II Circuit connections are made up in the

low voltage junction box. Refer to figure 2 for field

wiring diagram.

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TO

COOLING

SPEED

TO

HEATING

SPEED

Y1 RCWG RH

CONDENSING UNITTYPICAL INDOOR UNIT

ROOM THERMOSTAT

POWER

GROUND

PER NATIONAL

AND LOCAL

CODES

24v

TRANSFORMER

24V

CLASS II

JUNCTION

BOX

TO

HEATING

CONTROLS

TO 24V CLASS II POWER SOURCE

-- 20 VA MINIMUM

K3 INDOOR BLOWER RELAY

NOTE--IF INDOOR UNIT IS NOT EQUIPPED WITH

BLOWER RELAY, IT MUST BE FIELD PROVIDED

AND INSTALLED (P--8--3251 OR EQUIVALENT)

NOTE--SEE UNIT WIRING DIAGRAM

FOR POWER SUPPLY CONNECTIONS.24V CLASS II INSTALLED AT FACTORY

24V CLASS II FIELD INSTALLED

FIGURE 2

Y1

C

C

T1

R

W1

G

C

W2

HS23 TYPICAL FIELD WIRING DIAGRAM

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PLUMBING

Field refrigerant piping consists of liquid and suction

lines from the condensingunit (sweat connections) to

the indoor evaporator coil (flare or sweat connec-

tions). Use Lennox L10 series line sets as shown in

table 1 or use field--fabricated refrigerant lines. Refer

to unit information manual piping section for proper

size, type and application of field--fabricated lines.

Sweat Connection Procedure

1-- Ends of refrigerant lines must be cut square, free

from nicks or dents, deburred. Pipe must remain

round, do not pinch end of line.

2-- The thermometer well (packaged separately)

should be installed in the liquid line close to the

HS23unit as shown in figure3. Connect thermome-

terwellmale end to female endof liquid valve. Take

care to install thermometer well so that the ther-

mometer can be inserted and read easily. Wrap a

wet clotharound the liquid linevalvebodyand cop-

per tube stub to protect from heat damage during

brazing.Wrapanotherwet clothunderneath the liq-

uid valve to protect the base paint.

FIGURE 3

THERMOMETER WELL

(Field Installed)

PROTECT LIQUID LINE

VALVE WITH WET RAG

DURING BRAZING

THERMOMETER WELL

INSTALL THERMOMETER WELL SO THAT THERMOMETER

CAN BE INSERTED AND READ EASILY

LIQUID

LINE

VALVE

3-- Quench the joints with a wet cloth to prevent pos-

sible heat damage to the valve core and opening

port.

4-- The filter dryer is shipped with the unit and

shouldbe field installed as closeaspossible to the

expansion device.

REFRIGERANT METERING DEVICE

HS23 units are applicable to either RFC (II or IV) or an

expansion valve system. See indoor coil installation

instructions and the Lennox engineering handbook

for approved RFC and TXV match--ups and applica-

tion information.

RFC Systems

HS23 units are shipped with either an RFCII or RFCIV

metering device. Installation of the RFCII orifice is

shown in figure 4. Table 1 lists HS23 unit and corre-

sponding RFCII number. RFCIV bullet is installed as

shown in figure 5. Take care not to twist cap tubes

when loosening seal nut fromorifice body. In cases of

non--traditional applications, RFCIV bullet shipped

may not be appropriate. Refer to the indoor coil

installation instructions and the engineering hand-

book for specific orifice information.

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TABLE 1REFRIGERANT LINE KITS

UNITLIQUID

LINE

SUCTION

LINE

L10

LINE SETS

HS23--261

HS23--311

HS23--410

HS23--460

3/8 in

(10 mm)

3/4 in.

(19 mm)

L10--41

20 ft. -- 50 ft.

(6 m -- 15 m)

HS23--211 5/16 in*

(8 mm)

3/8 in

(10 mm)

L10--65

30 ft. -- 50 ft.

(9 m -- 15 m)

L10--21

20 ft. -- 50 ft.

(6 m -- 15 m)

5/8 in

(16 mm)

7/8 in.

(22 mm)

RFCII

ORIFICE

97H3301

27H9301

76A9001

P--8--11320

P--8--11323

HS23--141 ------1/4�

(6mm)

1/2�

(12mm)

FIELD

FABRICATED

HS23--510 47F6001

3/8 in

(10 mm)

1--1/8 in.

(29 mm)

FIELD

FABRICATEDHS23--650 47F6201

*Use reducer supplied in bag assembly.

RFCIV INSTALLATION

DISTRIBUTOR

�BULLET�

ORIFICE

ORIFICE

BODY

SEAL

NUT

FIGURE 5

SWEAT

CONNECTION

Expansion Valve Systems

Expansion valves equipped with either �Chatliff� or

flare type fittings are available from Lennox. Refer to

the indoor coil installation instructions or the engi-

neering handbook for applicable expansion valves

for use with specific match--ups.

3DJH �

If an expansion valve application is desired with in-

door coil product shipped with an RFCIV orifice, the

RFCIV restrictormust be removed before installing the

expansion valve.

IMPORTANT

Failure to remove RFCIV when installing an ex-pansion valve to the indoor coil will result in im-proper operation and damage to the system.

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Amanifold gauge set equippedwith�low loss�hoses

should be used when checking unit charge. A man-

ifold gauge set with anything other than �low loss�

hose should not be used.

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The liquid line and suction line service valves and

gauge ports are accessible by removing the compres-

sor access cover. Full service liquid and suction line

valves are used. See figures 6and 7. The service ports

are used for leak testing, evacuating, charging and

checking charge.

Liquid Line Service Valve ( Figure 6)

The valve is equipped with a service port. There is no

schrader valve installed in the liquid line service port. A

service port cap is supplied to seal off the port.

The liquid line service valve is a front and back seating

valve. When the valve is backseated the service port is

not pressurized. The service port cap can be removed

and gauge connections can be made.

To Access Service Port:

1-- Remove the stem cap. Use a service wrench to

make sure the service valve is backseated (turn

counterclockwise).

CAUTION

The service port cap is used to seal the liquidline service valve. A schrader valve is notprovided. Access to service port requiresbackseating the service valve to isolate theservice port from the system. Failure to do sowill cause refrigerant leakage.

KNIFE EDGE SEAL

STEM CAP

VALVEBACKSEATED

INLET(FROM OUTDOOR COIL)

OUTLET(TO INDOOR COIL)

SERVICE PORTCLOSED TO LINE SET

AND UNIT(NO PRESSURE)

SERVICE PORT CAP

TO OUTDOOR UNIT(COIL)

TO LINE SET

STEM CAP

KNIFE EDGESEAL

VALVE FRONTSEATED

TO LINE SET

SERVICE PORT OPENTO LINE SETAND CLOSEDTO UNIT

TO OUTDOORUNIT (COIL)

LIQUID LINE SERVICE VALVE

IMPORTANT

A schrader valve is not provided on the liquid line service port.Valve must be backseated to turn off pressure to service port.

VALVE STEMUSE SERVICEWRENCH

VALVE STEMUSE SERVICE WRENCH

FIGURE 6

2-- Remove service port cap and connect high pres-

sure gauge to service port.

3-- Using service wrench, open valve stem (one turn

clockwise) from backseated position.

4-- When finished using port, backseat stem with ser-

vice wrench. Tighten firmly.

5-- Replace service port and stem cap. Tighten finger

tight, then tighten an additional 1/6 turn.

To Close Off Service Port:

1-- Using service wrench, backseat valve by turning

stem counterclockwise. Tighten firmly.

3DJH �

To Open Liquid Line Service Valve:

1-- Remove the stem cap with an adjustable wrench.

2-- Using service wrench, backseat valve by turning

stem counterclockwise until backseated. Tighten

firmly.

3-- Replace stem cap, finger tighten then tighten an

additional 1/6 turn.

To Close Liquid Line Service Valve:

1-- Remove the stem cap with an adjustable wrench.

2-- Turn the stem in clockwisewith a servicewrench to

front seat the valve. Tighten firmly.

3-- Replace stem cap, finger tighten then tighten an

additional 1/6 turn.

Suction Line Service Valve ( Figure 7)

The valve is equipped with a service port. A schrader

valve is factory installed. A service port cap is supplied

to protect the schrader valve from contamination and

assure a leak free seal.

SUCTION LINE SERVICE VALVE (VALVE OPEN)

FIGURE 7

SCHRADER VALVE

SERVICE PORT

SERVICE PORTCAP

STEM CAP

SNAP RINGINSERT HEXWRENCH HERE

SUCTION LINE SERVICE VALVE (VALVE CLOSED)

INLET(FROM INDOOR COIL)

OUTLET (TOCOMPRESSOR)

KNIFE EDGESEAL

SCHRADER VALVE OPENTO LINE SET WHENVALVE IS CLOSED(FRONT SEATED)

SERVICE PORT

SERVICE PORTCAP

(VALVE FRONTSEATED)

SNAP RING

STEMCAP

OUTLET(TO COMPRESSOR)

KNIFE EDGE SEAL

INLET(FROM INDOOR COIL)

INSERT HEXWRENCH HERE

To Access Schrader Port:

1-- Remove service port cap with an adjustablewrench.

2-- Connect gauge to the service port.

3-- When testing is completed, replace service portcap. Tighten finger tight, then anadditional 1/6 turn.

To Open Suction Line Service Valve:

1-- Remove stem cap with an adjustable wrench.

2-- Using service wrench and 5/16� hex head exten-sion back the stem out counterclockwise until thevalve stem just touches the retaining ring.

Do not attempt to backseat this valve. Attempts tobackseat this valve will cause snap ring to explodefrom valve body under pressure of refrigerant.Personal injury and unit damage will result.

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3-- Replace stem cap tighten firmly. Tighten fingertight, then tighten an additional 1/6 turn.

To Close Suction Line Service Valve:

1-- Remove stem cap with an adjustable wrench.

2-- Using service wrench and 5/16� hex head exten-sion, turn stem clockwise to seat the valve. Tight-en firmly.

3-- Replace stem cap. Tighten finger tight, then tightenan additional 1/6 turn.

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After the line set has been connected to the indoor

and outdoor units, the line set connections and in-

door unit must be checked for leaks.

WARNING

Neveruseoxygen topressurize refrigerationor airconditioning system.Oxygenwill explodeon con-tact with oil and could cause personal injury.When using high pressure gas such as nitrogen orCO2 for this purpose, be sure to use a regulatorthat can control the pressure down to 1 or 2 psig.

Using an Electronic Leak Detector or Halide

1-- Connect a cylinder of nitrogen with a pressure reg-

ulating valve to the center port of the manifold

gauge set.

2-- Connect the high pressure hose of the manifold

gauge set to the service port of the suction valve.

(Normally, the high pressure hose is connected to

the liquid line port, however, connecting it to the

suction port better protects the manifold gauge

set from high pressure damage.)

3-- With bothmanifold valves closed, open the valve

on the R22 bottle (vapor only).

3DJH �

4-- Open the high pressure side of themanifold to al-

low R22 into the line set and indoor unit. Weigh in

a trace amount of R22. (A trace amount is a maxi-

mum of 2 ounces or 3 pounds pressure.) Close

the valve on the R22 bottle and the valve on the

high pressure side of themanifold gauge set. Dis-

connect R22 bottle.

5-- Adjust nitrogen pressure to 150 psig. Open the

valve on the high side of the manifold gauge set

which will pressurize line set and indoor unit.

6-- After a short period of time, open a refrigerant

port to make sure the refrigerant added is ade-

quate to be detected. (Amounts of refrigerant will

vary with line lengths.) Check all joints for leaks.

Purge nitrogen and R22 mixture. Correct any

leaks and recheck.

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Evacuating the system of non--condensables is criti-

cal for proper operation of the unit. Non--condens-

ables are defined as any gas that will not condense

under temperatures and pressures present during

operation of an air conditioning system. Non--con-

densables such as water vapor, combine with refrig-

erant to produce substances that corrode copper pip-

ing and compressor parts.

1-- Connect manifold gauge set to the service valve

ports as follows: low pressure gauge to suction

line service valve; high pressure gauge to liquid

line service valve.

2-- Connect the vacuum pump (with vacuum gauge)

to the center port of the manifold gauge set.

3-- Open both manifold valves and start vacuum

pump.

4-- Evacuate the line set and indoor unit to an abso-

lute pressure of 23mm of mercury or approxi-

mately 1 inch of mercury. During the early stages

of evacuation, it is desirable to close themanifold

gauge valve at least once to determine if there is a

rapid rise in absolute pressure. A rapid rise in

pressure indicates a relatively large leak. If this oc-

curs, the leak testingproceduremust be repeated.

NOTE -- The term absolute pressuremeans the to-

tal actual pressure within a given volume or sys-

tem, above the absolute zero of pressure. Abso-

lute pressure in a vacuum is equal to atmospheric

pressure minus vacuum pressure.

5-- When the absolute pressure reaches 23mm of

mercury, close the manifold gauge valves, turn

off the vacuum pump and disconnect the man-

ifold gauge center port hose from vacuumpump.

Attach themanifold center port hose to anitrogen

cylinder with pressure regulator set to 150 psig

and purge the hose. Open the manifold gauge

valves to break the vacuum in the line set and in-

door unit. Close the manifold gauge valves.

&$87,21

Danger of Equipment Damage.Avoid deep vacuum operation. Do not use com-pressors to evacuate a system.Extremely low vacuums can cause internal arc-ing and compressor failure.Damage caused by deep vacuum operation willvoid warranty.

6-- 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.

7-- Reconnect the manifold gauge to the vacuum

pump, turn thepumponandcontinue toevacuate

the line set and indoor unit until theabsolutepres-

sure does not rise above5mmofmercurywithin a

20 minute period after shutting off the vacuum

pump and closing the manifold gauge valves.

8-- Depending on the equipment used to determine

the vacuum level, the following units are equiva-

lent to absolute pressure of 5mm of mercury:

5000 microns; 754 millimeters of mercury vacu-

um pressure; or 29.7 inches of mercury vacuum

pressure.

9-- When the absolute pressure requirement above

has been met, disconnect the manifold hose from

the vacuum pump and connect it to an upright

bottle of R22 refrigerant. Open themanifold gauge

valves to break the vacuum in the line set and in-

door unit. Close manifold gauge valves and shut

off R22 bottle and remove manifold gauge set.

67$57��83

IMPORTANT

Crankcase heater should be energized 24 hoursbefore unit start--up to prevent compressor dam-age as a result of slugging.

1-- Rotate fan to check for frozenbearings or binding.

2-- Inspect all factory and field--installed wiring for

loose connections.

3-- After evacuation is complete, open liquid line and

suction line service valves to release refrigerant

charge (contained in condensing unit) into the

system.

3DJH �

4-- Replace stem caps and secure finger tight, then

tighten an additional (1/6) one--sixth of a turn.

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5-- Check voltage supply at the disconnect switch.

The voltage must be within the range listed on

unit nameplate. If not, do not start the equipment

until the power company has been consulted and

the voltage condition corrected.

6-- Set the thermostat for cooling demand, turn on

power to evaporator blower and close condens-

ing unit disconnect switch to start unit.

7-- Recheck voltage with unit running. Power must

be within range shown on nameplate. Check am-

perage draw of unit. Refer to unit nameplate for

correct running amps.

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Units are factory charged with the amount of R22 re-

frigerant indicated on the unit rating plate. This charge

is based on a matching indoor coil and outdoor coil

with 20 ft. (6096 mm) line set. For varying lengths of

line set, refer to table 2 for refrigerant charge adjust-

ment. A blank space is provided on the rating plate to

list the actual field charge.

Liquid LineSet Diameter

Ozs. per 5 ft. (ml per mm) adjust

from 20 ft. (6096 mm) line set*

1/4 in.(6mm)

1 ounce per 5 ft.(30ml per 1524 mm)

3/8 in.(10mm)

5/16 in.(8mm)

2 ounce per 5 ft.(60ml per 1524 mm)

3 ounce per 5 ft.(90ml per 1524 mm)

*If line length is greater than 20 feet (6096 mm), add thisamount. If line length is less than 20 feet (6096 mm), subtractthis amount.

TABLE 2

If the system is void of refrigerant, the recommended

andmost accuratemethodof charging is toweigh the

refrigerant into the unit according to the total amount

shown on the unit nameplate. This may be done after

any leaks havebeen repaired. Ifweighing facilities are

not available or if unit is just lowon charge, use oneof

the procedures outlined.

Charging a condensing unit is recommended during

warm weather. However, applications arise in which

charging must occur in the colder months. The way

the unit is charged depends on the unit�s refrigerant

metering device and the outdoor ambient tempera-

ture.

For RFC systems,weighing in the charge and Subcool-

ing are two acceptablemeans of charging under certain

conditions. For installations of anRFC systemwhere the

outdoor ambient is less than 60EF, weighing in the

charge is the best method. However, in installations

where the outdoor ambient is 60EF or above, subcool-

ing is the best method.

The �weighing in the charge� and the Approach

methods are the two recommended procedures for

charging the HS23 using an expansion valve system

for refrigerant metering. The difference between the

two involves the outdoor ambient temperature. For

expansion valve systems where the outdoor ambient

temperature is 60EF or above, the Approach method

must be used. For expansion valve systems where

the outdoor ambient temperature is below 60EF,

weighing in the charge will suffice.

Before charging the unit, follow the procedure below

to determine: the liquid line temperature and the out-

door ambient temperature.

1-- Connectmanifoldgaugeset to servicevalves: low

pressure gauge to suction valve service port; high

pressure gauge to liquid valve service port. Con-

nect the centermanifold hose to an upright bottle

of R22. Close manifold gauge set valves.

2-- Set the room thermostat to call for heat. This will

create the necessary load for properly charging

the system in the cooling cycle.

3-- Fill the thermometer well with mineral oil.

4-- Record the outdoor ambient temperature. For

greater accuracy, use the same thermometer to

measure liquid temperature.

5-- When thermostat demand has been satisfied,

switch to cooling mode with a set point of 68EF.

When pressures have stabilized, place the ther-

mometer in thermometer well and record the liq-

uid line temperature.

6-- The outdoor temperature will determine which

charging method to use. Proceed with the ap-

propriate charging procedure below.

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Weighing in the Charge Method

RFC Systems, < 60EF Outdoor Temp

1-- Recover the refrigerant from the unit.

2-- Conduct a leak check, then evacuateas previously

outlined.

3-- Weigh in the factory charge as shown on the out-

door unit�s rating plate.

3DJH �

The Subcooling Method

RFC Systems, > 60EF Outdoor Temp

1-- With the manifold gauge hose still on the liquid

service port and the unit operating stably, record

the liquid line temperature.

2-- At the same time, record the liquid line pressure

reading.

3-- Using a temperature/pressure chart for R22, de-

termine the saturation temperature for the liquid

line pressure reading.

4-- Subtract the liquid line temperature from the sat-

uration temperature (according to the chart) to

determine subcooling. (Liquid line temperature --

Saturation temperature = Subcooling)

5-- Compare the subcooling valuewith those in table

3. If subcooling is greater than shown, some re-

frigerant must be recovered. If subcooling is less

than shown, some refrigerant must be added.

--650

OUTDOOR

TEMP. (EF)

LIQUID SUBCOOLING (+ 1EF)

60

65

70

75

80

85

90

95

100

105

110

115

--211 --261 --311 --411 --461

9

8

7

7

6

6

5

4

4

3

3

2

14

14

13

13

12

12

11

11

10

10

9

8

17

16

15

14

13

12

11

10

8

7

6

4

15

15

14

14

13

13

12

11

11

10

10

9

17

16

16

15

15

14

14

13

13

12

11

10

TABLE 3SUBCOOLING FOR RFC SYSTEMS

--141 --510

11

11

10

10

9

9

8

8

7

6

6

5

15

14

14

14

13

13

11

10

8

6

4

3

20

19

19

18

18

17

17

16

15

15

14

13

--463

18

17

17

17

15

15

14

14

13

12

10

9

--413

15

14

13

12

11

10

9

8

6

5

4

2

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Weighing in the Charge Method

TXV Systems, < 60EF Outdoor Temp

1-- Recover the refrigerant from the unit.

2-- Conduct a leak check, thenevacuate as previously

outlined.

3-- Weigh in the factory charge as shown on the out-

door unit�s rating plate.

The Approach Method

TXV Systems, > 60EF Outdoor Temp

Having taken the outdoor ambient and liquid line

temperature readings, subtract the outdoor ambient

temperature from the liquid line temperature to de-

termine the Approach temperature. (Liquid line EF --

Outdoor Ambient EF = Approach temperature) The

resulting difference (Approach temperature) should

agree with the values given in table 4. If not, add re-

frigerant to lower the approach temperature or recov-

er refrigerant from the system to increase the ap-

proach temperature.

TABLE 4APPROACH METHOD

HS23--211

HS23--261

HS23--311

HS23--413

HS23--461

5 + 1

5 + 1

8 + 1

10 + 1

9 + 1

HS23--141 2 + 1

HS23--510

HS23--650

5 + 1

10 + 1

Note--For best results, the same thermometer should be used tocheck both outdoor ambient and liquid temperatures.

MODEL NO.APPROACH TEMPERATURE

LIQUID LINE E F

-- OUTDOOR AMBIENT E F

HS23--411 9 + 1

HS23--463 8 + 1

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Condensing unit and indoor blower cycle on demand

from room thermostat. When thermostat blower

switch is switched to ON position, indoor blower op-

erates continuously.

Crankcase Heater

Four and five ton units are equipped with internal

self--regulating crankcase heaters.

Compressor Start Kit

Three and one half, four and five ton single phase

units have internal start components and do not re-

quire field installation of a compressor start kit.

Timed Off Control

(International and Government Units ONLY)

Five ton units are factory equipped with a timed off

control which provides low voltage protection and

prevents compressor short cycling.

High and Low Pressure Switches

(International and Government Units ONLY)

The HS23 is factory--equipped with a manual reset

high pressure switch (see figure 8 for location) and an

auto--reset low pressure switch. Pressure switches

are mounted on valve cores in the line to allow for

easy replacement.

HS23 SERIES HIGH PRESSURE LIMIT RESET

FIGURE 8

RESET BUTTON

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At the beginning of each cooling season, the system

should be checked as follows:

1-- Clean and inspect condenser coil. Coil may be

flushed with a water hose.

2-- Visually inspect connecting lines and coils for evi-

dence of oil leaks.

3-- Check wiring for loose connections.

4-- Check for correct voltage at unit (unit operating).

5-- Check condenser fan motor amp--draw.

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Evaporator Coil

1-- Clean coil, if necessary.

2-- Check connecting lines and coils for evidence of

oil leaks.

3-- Check condensate line and clean, if necessary.

Indoor Unit

1-- Clean or change filters.

2-- Adjust blower speed for cooling. The pressure drop

over the coil should be measured to determine the

correct blower CFM. Refer to the unit information

servicemanual for pressure drop tables and proce-

dure.

3-- Belt Drive Blowers � Check belt for wear and

proper tension.

4-- Check all wiring for loose connections

5-- Check for correct voltage at unit (blower operat-

ing).

6-- Check amp--draw on blower motor

Unit nameplate_________ Actual ____________.