Bryant 661C Instructions and recipes

NOTE: Read the entire instruction manual before starting the

installation.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance,

or use can cause explosion, fire, electrical shock, or other

conditions which may cause death, personal injury, or property

damage. Consult a qualified installer, service agency, or your

distributor or branch for information or assistance. The qualified

installer or agency must use factory-authorized kits or accessories

when modifying this product. Refer to the individual instructions

packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing,

and work gloves. Use quenching cloth for brazing operations.

Have fire extinguisher available. Read these instructions thor-

oughly and follow all warnings or cautions included in literature

and attached to the unit. Consult local building codes and National

Electrical Code (NEC) for special requirements.

Recognize safety information. This is the safety-alert symbol .

When you see this symbol on the unit and in instructions or

manuals, be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, and CAU-

TION. These words are used with the safety-alert symbol. DAN-

GER identifies the most serious hazards which will result in severe

personal injury or death. WARNING signifies hazards which

could result in personal injury or death. CAUTION is used to

identify unsafe practices which would result in minor personal

injury or product and property damage. NOTE is used to highlight

suggestions which will result in enhanced installation, reliability,

or operation.

WARNING: Before installing, modifying, or servicing

system, main electrical disconnect switch must be in the

OFF position. There may be more than 1 disconnect

switch. Lock out and tag switch(es) with a suitable

warning label. Electrical shock can cause personal injury

or death.

INSTALLATION RECOMMENDATIONS

NOTE: In some cases noise in the living area has been traced to

gas pulsations from improper installation of equipment.

1. Locate unit away from windows, patios, decks, etc. where

unit operation sounds may disturb customer.

2. Ensure that vapor and liquid tube diameters are appropriate

to capacity of unit.

3. Run refrigerant tubes as directly as possible by avoiding

unnecessary turns and bends.

4. Leave some slack between structure and unit to absorb

vibration.

5. When passing refrigerant tubes through the wall, seal

opening with RTV or other pliable silicon-based caulk. (See

Fig. 3.)

6. Avoid direct tubing contact with water pipes, duct work,

floor joists, wall studs, floors, and walls.

7. Do not suspend refrigerant tubing from joists and studs with

a rigid wire or strap which comes in direct contact with

tubing. (See Fig. 3.)

8. Ensure that tubing insulation is pliable and completely

surrounds vapor tube.

9. When necessary, use hanger straps which are 1 in. wide and

conform to shape of tubing insulation. (See Fig. 3.)

10. Isolate hanger straps from insulation by using metal sleeves

bent to conform to shape of insulation.

Fig. 1—Models 661C

A94355

Fig. 2—Models 661G and 661S

A98524

installation and

start-up instructions

10 SEER

SPLIT-SYSTEM

HEAT PUMP

Cancels: II 661C-18-6 II 661C-18-7

2-02

661C, G

661S

—1—

When outdoor unit is connected to factory-approved indoor unit,

outdoor unit contains system refrigerant charge for operation with

indoor unit of the same size when connected by 15 ft of

field-supplied or factory accessory tubing. For proper unit opera-

tion, check refrigerant charge using charging information located

on control box cover.

IMPORTANT: Maximum liquid-line size is 3/8-in. O.D. for all

residential applications including long line.

IMPORTANT: Always install a liquid-line filter drier. Refer to

Product Data Sheet for appropriate part number. Obtain filter drier

from service parts or your distributor or branch.

INSTALLATION

I. CHECK EQUIPMENT AND JOB SITE

A. Unpack Unit

Move to final location. Remove carton taking care not to damage

unit.

B. Inspect Equipment

File claim with shipping company prior to installation if shipment

is damaged or incomplete. Locate unit rating plate on unit service

panel. It contains information needed to properly install unit.

Check rating plate to be sure unit matches job specifications.

II. INSTALL ON A SOLID, LEVEL MOUNTING PAD

If conditions or local codes require the unit be attached to pad, tie

down bolts should be used and fastened through knockouts

provided in unit base pan. Refer to unit mounting pattern in Fig. 4

to determine base pan size and knockout hole location.

On rooftop applications, mount on level platform or frame 6 in.

above roof surface. Place unit above a load-bearing wall and

isolate unit and tubing set from structure. Arrange supporting

members to adequately support unit and minimize transmission of

vibration to building. Consult local codes governing rooftop

applications.

Roof mounted units exposed to winds above 5 mph may require

wind baffles to achieve adequate defrost. Consult Low-Ambient

Guideline for wind baffle construction.

NOTE: Unit must be level to within ± 2°(± 3/8 in./ft) per

compressor manufacturer specifications.

III. CLEARANCE REQUIREMENTS

When installing, allow sufficient space for airflow clearance,

wiring, refrigerant piping, and service. Allow 30-in. clearance to

service end of unit and 48 in. above unit. For proper airflow, a 6-in.

clearance on 1 side of unit and 12 in. on all remaining sides must

be maintained. Maintain a distance of 24 in. between units.

Position so water, snow, or ice from roof or eaves cannot fall

directly on unit.

On rooftop applications, locate unit at least 6 in. above roof

surface.

IV. OPERATING AMBIENTS

The minimum outdoor operating ambient in cooling mode is 55°F,

and the maximum outdoor operating ambient in cooling mode is

125°F. The maximum outdoor operating ambient in heating mode

is 66°F.

V. ELEVATE UNIT

CAUTION: Accumulation of water and ice in base pan

may cause equipment damage.

In areas where prolonged freezing temperatures are encountered,

elevate unit per local climate and code requirements to provide

clearance above estimated snowfall level and ensure adequate

drainage of unit.

VI. CHECK INDOOR AND OUTDOOR CHECK-FLO-

RATER®PISTON

Check indoor coil piston to see if it matches the required piston

shown on outdoor unit rating plate. If it does not match, replace

indoor coil piston with piston shipped with outdoor unit. The

piston shipped with outdoor unit is correct for any approved indoor

coil combination.

Fig. 3—Connecting Tube Installation

A94208

INSULATION

VAPOR TUBE

LIQUID TUBE

OUTDOOR WALL INDOOR WALL

LIQUID TUBE

VAPOR TUBE

INSULATION

CAULK

Avoid contact between tubing and structureNOTE:

THROUGH THE WALL

HANGER STRAP

(AROUND VAPOR

TUBE ONLY)

JOIST

1″MIN.

SUSPENSION

Fig. 4—Mounting Unit to Pad

DIMENSIONS (IN.)

UNIT

SIZE

MINIMUM

MOUNTING PAD

DIMENSIONS

TIEDOWN KNOCKOUT LOCATIONS

ABC

018—030 22-1/2 X 22-1/2 3-11/16 18-1/8 14-3/8

042—060 30 X 30 6-1/2 23-1/2 20

A94199

3⁄8″D. (9.53) TIEDOWN

KNOCKOUTS (2) PLACES

—2—

CAUTION: Remove indoor coil piston if unit is to be

installed on system with a TXV metering device.

Check outdoor unit piston. Remove retainer on liquid service valve

and check piston size with matching number listed on outdoor unit

rating plate.

VII. CHECK DEFROST THERMOSTAT

Check defrost thermostat to ensure it is properly located and

securely attached. There is a liquid header with a brass distributor

and feeder tube going into outdoor coil. At the end of 1 of the

feeder tubes, there is a 3/8-in. O.D. stub tube approximately 2 in.

long. (See Fig. 5.) The defrost thermostat should be located on stub

tube. Note that there is only 1 stub tube used with liquid header,

and on most units it is the bottom circuit.

VIII. MAKE PIPING CONNECTIONS

WARNING: Relieve pressure and recover all refrigerant

before system repair or final unit disposal to avoid

personal injury or death. Use all service ports and open all

flow-control devices, including solenoid valves.

CAUTION: If ANY refrigerant tubing is buried, provide

a 6 in. vertical rise at service valve. Refrigerant tubing

lengths up to 36 in. may be buried without further special

consideration. For lengths above 36 in., consult your local

distributor.

CAUTION: To prevent damage to unit or service valves

observe the following:

•Use a brazing shield.

•Wrap service valves with wet cloth or use a heat-sink

material.

Outdoor units may be connected to indoor section using accessory

tubing package or field-supplied refrigerant grade tubing of correct

size and condition. For tubing requirements beyond 50 ft in length

or 20 ft vertical differential, substantial capacity and performance

losses can occur. Following the recommendations in the Residen-

tial Split System Long-Line Application Guideline will reduce

these losses. Refer to Table 1 for field tubing equivalent line

length.

If refrigerant tubes or indoor coil are exposed to atmosphere, they

must be evacuated to 500 microns to eliminate contamination and

moisture in the system.

A. Outdoor Unit Connected to Factory-Approved In-

door Unit

Outdoor unit contains correct system refrigerant charge for opera-

tion with indoor unit of same size when connected by 15 ft of

field-supplied or factory-accessory tubing. Check refrigerant

charge for maximum efficiency.

B. Refrigerant Tubing

Connect tubing to fittings on outdoor unit vapor and liquid service

valves. (See Table 1.) Use refrigerant grade tubing. Refer to

appropriate section below for type of service valves installed on

unit.

C. Sweat Connection

CAUTION: To avoid valve damage while brazing, ser-

vice valves must be wrapped in a heat-sinking material

such as a wet cloth.

Remove plastic retainer holding outdoor piston in liquid service

valve and connect sweat/flare adapter provided to valve. (See Fig.

6.) Connect refrigerant tubing to fittings on outdoor unit vapor and

liquid service valves. Service valves are closed from factory and

ready for brazing. After wrapping service valve with a wet cloth,

tubing set can be brazed to service valve using either silver bearing

or non-silver bearing brazing material. Consult local code require-

ments. Refrigerant tubing and indoor coil are now ready for leak

testing. This check should include all field and factory joints.

D. Final Tubing Check

IMPORTANT: Check to be certain factory tubing on both indoor

and outdoor unit has not shifted during shipment. Ensure tubes are

not rubbing against each other or any sheet metal. Pay close

attention to feeder tubes, making sure wire ties on feeder tubes are

secure and tight.

TABLE 1—REFRIGERANT CONNECTIONS AND RECOMMENDED LIQUID AND VAPOR TUBE DIAMETERS (IN.)

UNIT

SIZE LIQUID VAPOR VAPOR (LONG LINE)

Connection Diameter Tube Diameter Connection Diameter Tube Diameter Connection Diameter Tube Diameter

018, 024 3/8 3/8 5/8 5/8 5/8 3/4

060, 036 3/8 3/8 3/4 3/4 3/4 7/8

042, 048 3/8 3/8 7/8 7/8 7/8 1-1/8

060 3/8 3/8 7/8 1-1/8 7/8 1-1/8

NOTES:

1. Tube Diameters are for lengths up to 50 ft or 20 ft vertical differential. For tubing lengths greater than 50 ft, consult the Application Guideline and Service Manual for Air

Conditioners and Heat Pumps Using R-22 Refrigerant.

Fig. 5—Defrost Thermostat Location

A97517

FEEDER TUBE

DEFROST

THERMOSTAT

STUB TUBE

—3—

IX. MAKE ELECTRICAL CONNECTIONS

WARNING: To avoid personal injury or death, do not

supply power to unit with compressor terminal box cover

removed.

Be sure field wiring complies with local and national fire, safety,

and electrical codes, and voltage to system is within limits shown

on unit rating plate. Contact local power company for correction of

improper voltage. See unit rating plate for recommended circuit

protection device.

NOTE: Operation of unit on improper line voltage constitutes

abuse and could affect unit reliability. See unit rating plate. Do not

install unit in system where voltage or phase imbalance (3 phase)

may fluctuate above or below permissible limits.

NOTE: Use copper wire only between disconnect switch and

unit.

NOTE: Install branch circuit disconnect of adequate size per

NEC to handle unit starting current. Locate disconnect within sight

from and readily accessible from unit, per Section 440-14 of NEC.

A. Route Ground and Power Wires

Remove access panel to gain access to unit wiring. Extend wires

from disconnect through power wiring hole provided and into unit

control box.

WARNING: The unit cabinet must have an uninter-

rupted or unbroken ground to minimize personal injury if

an electrical fault should occur. The ground may consist

of electrical wire or metal conduit when installed in

accordance with existing electrical codes. Failure to

follow this warning can result in an electric shock, fire, or

death.

B. Connect Ground and Power Wires

Connect ground wire to ground connection in control box for

safety. Connect power wiring to contactor as shown in Fig. 7.

C. Connect Control Wiring

Route 24v control wires through control wiring grommet and

connect leads to control wiring. (See Fig. 8 and 9.)

Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If

thermostat is located more than 100 ft from unit, as measured

along the control voltage wires, use No. 16 AWG color-coded wire

to avoid excessive voltage drop.

All wiring must be NEC Class 1 and must be separated from

incoming power leads.

Use furnace transformer, fan coil transformer, or accessory trans-

former for control power, 24v/40va minimum.

NOTE: Use of available 24v accessories may exceed the mini-

mum 40va power requirement. Determine total transformer load-

ing and increase the transformer capacity or split the load with an

accessory transformer as required.

D. Final Wiring Check

IMPORTANT: Check factory wiring and wire connections to

ensure terminations are secured properly. Check wire routing to

ensure wires are not in contact with tubing, sheet metal, etc.

X. COMPRESSOR CRANKCASE HEATER

When equipped with a crankcase heater, furnish power to heater a

minimum of 24 hr before starting unit. To furnish power to heater

only, set thermostat to OFF and close electrical disconnect to

outdoor unit. A crankcase heater is required if refrigerant tubing is

longer than 50 ft.

XI. COMPRESSOR CRANKCASE HEATER

When equipped with a crankcase heater, furnish power to heater a

minimum of 24 hr before starting unit. To furnish power to heater

only, set thermostat to OFF and close electrical disconnect to

outdoor unit. A crankcase heater is required if refrigerant tubing is

longer than 50 ft.

XII. INSTALL ELECTRICAL ACCESSORIES

Refer to the individual instructions packaged with kits or acces-

sories when installing.

XIII. START-UP

CAUTION: To prevent compressor damage or personal

injury, observe the following:

•Do not overcharge system with refrigerant.

•Do not operate unit in a vacuum or at negative pressure.

•Do not disable low-pressure switch.

In scroll compressor applications:

•Dome temperatures may be hot.

Fig. 6—Liquid Service Valve with Sweat Adapter Tube

A97512

PISTON BODY

PISTON

RETAINER

SWEAT/FLARE ADAPTER

STRAINER

Fig. 7—Line Power Connections

A94025

DISCONNECT

PER N.E.C. AND/OR

LOCAL CODES CONTACTOR

GROUND

LUG

FIELD GROUND

WIRING

FIELD POWER

WIRING

BLUE

3 PHASE ONLY

—4—

24 VAC HOT R

W/W1

Y/Y2

O/W2

RVS COOLING

BRYANT

PROGRAMMABLE

THERMOSTAT

MODEL HP

FA, FB, FC,

FD, FF, FH

FAN COIL HEAT

PUMP

Y1/W2

INDOOR FAN

HEAT STAGE 2

COOL/HEAT

STAGE 1

NOT USED

24 VAC COM

NOT USED

TROUBLE

OPTIONAL

OUTDOOR

SENSOR

CONNECTION

IF AVAILABLE

A97370

Fig. 8—Typical 24v Circuit Connections using Bryant Model HP Thermostat with Fan Coils and No Outdoor Thermostat, 1

Outdoor Thermostat, or 2 Outdoor Thermostats

A97400

24 VAC HOT R

W/W1

Y/Y2

O/W2

RVS COOLING

BRYANT

PROGRAMMABLE

THERMOSTAT

MODEL HP

TWO

OUTDOOR

THERMOSTATS

FA, FB, FC,

FD, FF, FH

FAN COIL HEAT

PUMP

Y1/W2

INDOOR FAN

HEAT STAGE 2

COOL/HEAT

STAGE 1

NOT USED

24 VAC COM

NOT USED

TROUBLE

OPTIONAL

OUTDOOR

SENSOR

CONNECTION

ODT

NOTE: Remove wires from crimp nut in indoor fan coil

when installing outdoor thermostats.

IMPORTANT: When using outdoor thermostats, W2 must be

energized when requesting supplemental heat.

EHR

24 VAC HOT R

W/W1

Y/Y2

O/W2

RVS COOLING

BRYANT

PROGRAMMABLE

THERMOSTAT

MODEL HP

ONE

OUTDOOR

THERMOSTAT

FA, FB, FC, FD, FF, FH

FAN COIL HEAT

PUMP

Y1/W2

INDOOR FAN

HEAT STAGE 2

COOL/HEAT

STAGE 1

NOT USED

24 VAC COM

NOT USED

TROUBLE

OPTIONAL

OUTDOOR

SENSOR

CONNECTION

ODT

NOTE: Remove wires from crimp nut in indoor fan coil

when installing outdoor thermostat.

IMPORTANT: When using outdoor thermostat, W2 must be

energized when requesting supplemental heat.

A97399

24 VAC HOT R

W/W1

Y/Y2

O/W2

RVS COOLING

BRYANT

PROGRAMMABLE

THERMOSTAT

MODEL HP FK4C

FAN COIL HEAT

PUMP

Y1/W2

INDOOR FAN

HEAT STAGE 2

COOL/HEAT

STAGE 1

NOT USED

24 VAC COM

NOT USED

TROUBLE

OPTIONAL

OUTDOOR

SENSOR

CONNECTION

Y/Y2

J1 JUMPER

J2 JUMPER

A97372

—5—

24 VAC HOT R

RVS COOLING

OTHER

HP THERMOSTAT

FA, FB, FC,

FD, FF, FH

FAN COIL HEAT

PUMP

24 VAC COM

HEAT STAGE 2

COOL/HEAT

STAGE 1

INDOOR FAN

EMERGENCY

HEAT

IF AVAILABLE

A97374

Fig. 9—Typical 24v Circuit Connections using Other HP Thermostats with Fan Coils and No Outdoor T

24 VAC HOT R

RVS COOLING

OTHER

HP THERMOSTAT

TWO

OUTDOOR

THERMOSTATS

FA, FB, FC,

FD, FF, FH

FAN COIL HEAT

PUMP

INDOOR FAN

HEAT STAGE 2

COOL/HEAT

STAGE 1

24 VAC COM

EMERGENCY

HEAT

ODT

NOTE: Remove wires from crimp nut in indoor fan coil

when installing outdoor thermostats.

IMPORTANT: When using outdoor thermostats, W2 must be

energized when requesting supplemental heat.

EHR

IF AVAILABLE

24 VAC HOT R

RVS COOLING

OTHER

HP THERMOSTAT

ONE

OUTDOOR

THERMOSTAT

FA, FB, FC,

FD, FF, FH

FAN COIL HEAT

PUMP

INDOOR FAN

HEAT STAGE 2

COOL/HEAT

STAGE 1

24 VAC COM

EMERGENCY

HEAT

ODT

NOTE: Remove wires from crimp nut in indoor fan coil

when installing outdoor thermostat.

IMPORTANT: When using outdoor thermostat, W2 must be

energized when requesting supplemental heat.

24 VAC HOT R

RVS COOLING

OTHER

HP THERMOSTAT FK4C

FAN COIL HEAT

PUMP

Y/Y2

24 VAC COM

HEAT STAGE 2

COOL/HEAT

STAGE 1

INDOOR FAN

EMERGENCY

HEAT

J1 JUMPER

J2 JUMPER

—6—

CAUTION: To prevent personal injury wear safety

glasses, protective clothing, and gloves when handling

refrigerant and observe the following:

•Back-seating service valves are not equipped with

Schrader valves. Fully back seat (counterclockwise)

valve stem before removing gage-port cap.

•Front-seating service valves are equipped with Schrader

valves.

CAUTION: Do not vent refrigerant to atmosphere. Re-

cover during system repair or final unit disposal.

1. Fully back seat (open) liquid- and vapor-tube service

valves.

2. Unit is shipped with valve stem(s) front seated (closed) and

caps installed. Replace stem caps after system is opened to

refrigerant flow. Replace caps finger-tight and tighten with

wrench an additional 1/12 turn.

3. Close electrical disconnects to energize system.

4. Set room thermostat to desired temperature. Be sure set

point is below indoor-ambient temperature.

5. Set room thermostat to HEAT or COOL and fan control to

ON or AUTO mode, as desired. Operate unit for 15

minutes. Check system-refrigerant charge.

CAUTION: •3-phase scroll compressors are rotation

sensitive.

•A flashing LED on phase monitor indicates reverse

rotation. (See Fig. 10 and Table 3.)

•This will not allow contactor to be energized.

•Disconnect power to unit and interchange 2 field wiring

leads on unit contactor.

A. Sequence of Operation l .

With power supplied to indoor and outdoor units, transformer is

energized.

COOLING

On a call for cooling, thermostat makes circuits R-O, R-Y, and

R-G. Circuit R-O energizes reversing valve, switching it to cooling

position. On three phase models with scroll compressors, the units

are equipped with a phase monitor to detect if the incoming power

is correctly phased for compressor operation. (See Fig. 10 and

Table 3.) If the phasing is correct, circuit R-Y energizes contactor,

starting outdoor fan motor and compressor circuit. R-G energizes

indoor unit blower relay, starting indoor blower motor on high

speed.

NOTE: If the phasing is incorrect, the contactor will not be

energized. To correct the phasing, interchange any two of the three

power connections on the field side.

When thermostat is satisfied, its contacts open, de-energizing the

contactor and blower relay. Compressor and motors should stop.

NOTE: If indoor unit is equipped with a time-delay relay circuit,

the blower runs an additional 90 sec to increase system efficiency.

HEATING

On a call for heating, thermostat makes circuits R-Y and R-G. If

phasing is correct, circuit R-Y energizes contactor, starting out-

door fan motor and compressor. Circuit R-G energizes indoor

blower relay, starting blower motor on high speed.

Should temperature continue to fall, R-W2 is made through

second-stage room thermostat bulb. Circuit R-W2 energizes a

sequencer, bringing on first bank of supplemental electric heat and

providing electrical potential to second heater sequencer (if used).

If outdoor temperature falls below setting of outdoor thermostat

(field-installed option), contacts close to complete circuit and bring

on second bank of supplemental electric heat.

When thermostat is satisfied, its contacts open, de-energizing

contactor and sequencer. All heaters and motors should stop.

DEFROST

The defrost control is a time/temperature control which includes a

field-selectable (quick-connects located at board edge) time period

between defrost cycles (30, 50, or 90 minutes), factory set at 90

minutes.

The electronic timer and defrost cycle start only when contactor

energized and defrost thermostat is closed.

Defrost mode is identical to cooling mode except that outdoor fan

motor stops and second-stage heat is turned on to continue

warming conditioned space.

To initiate defrost, the defrost thermostat must be closed. This can

be accomplished as follows:

1. Turn off power to outdoor unit.

2. Disconnect outdoor fan motor lead from OF2 on control

board. (See Fig. 11.) Tape lead to prevent grounding.

A97413

LEGEND

24-V FACTORY WIRING

24-V FIELD WIRING

FIELD SPLICE CONNECTION

OUTDOOR THERMOSTAT

EMERGENCY HEAT RELAY

SUPPLEMENTAL HEAT RELAY

SHR

EHR

ODT

Fig. 10—Phase Monitor Control

A00010

—7—

3. Restart unit in heating mode, allowing frost to accumulate

on outdoor coil.

4. After a few minutes in heating mode, liquid line tempera-

ture should drop below closing point of defrost thermostat

(approximately 30°F).

5. Short between speed-up terminals with a flat-bladed screw-

driver. (See Fig. 11.) This reduces the timing sequence to

1/256th of original time. (See Table 2.)

6. When you hear reversing valve change position, remove

screwdriver immediately; otherwise, control will terminate

normal 10-minute defrost cycle in approximately 2 sec.

NOTE: Length of defrost cycle is dependent on the length of time

it takes to remove screwdriver from test pins after reversing valve

has shifted.

7. Unit will remain in defrost for remainder of defrost cycle

time or until defrost thermostat reopens at approximately

80°F coil temperature of liquid line.

8. Turn off power to outdoor unit and reconnect fan motor lead

to OF2 on control board. (See Fig. 11.)

XIV. CHECK CHARGE

Factory charge is shown on unit rating plate. To check charge in

cooling mode, refer to Cooling Only Procedure on unit wiring and

charging label. To check charge in heating mode, refer to Heating

Check Chart Procedure.

NOTE: If superheat or subcooling charging conditions are not

favorable, charge must be weighed in accordance with unit rating

plate ± 0.6 oz/ft of 3/8-in. liquid line above or below 15 ft

respectively.

A. Heating Check Chart Procedure

To check system operation during heating cycle, refer to the

Heating Check Chart on outdoor unit. This chart indicates whether

a correct relationship exists between system operating pressure and

air temperature entering indoor and outdoor units. If pressure and

temperature do not match on chart, system refrigerant charge may

not be correct. Do not use chart to adjust refrigerant charge.

NOTE: When charging is necessary during heating season,

charge must be weighed in accordance with unit rating plate ± 0.6

oz/ft of 3/8-in. liquid line above or below 15 ft respectively.

EXAMPLE:

To calculate additional charge required for a 25-ft line set:

25 ft - 15 ft = 10 ft X 0.6 oz/ft =6 oz of additional charge

XV. FINAL CHECKS

IMPORTANT: Before leaving job, be sure to do the following:

1. Securely fasten all panels and covers.

2. Tighten service valve stem caps to 1/12-turn past finger

tight.

3. Leave User’s Manual with owner. Explain system operation

and periodic maintenance requirements outlined in manual.

4. Fill out Dealer Installation Checklist and place in customer

file.

CARE AND MAINTENANCE

For continuing high performance and to minimize possible equip-

ment failure, periodic maintenance must be performed on this

equipment.

Frequency of maintenance may vary depending upon geographic

areas, such as coastal applications.

Fig. 11—Defrost Control

A91444

OF1 OF2

ORT2 Y TI DFT CTEST 30 50 90

CES0110063,

CES0130024

TABLE 2—DEFROST CONTROL SPEED-UP

TIMING SEQUENCE

PARAMETER MINIMUM

(MINUTES) MAXIMUM

(MINUTES) SPEED-UP

(NOMINAL)

30-minute cycle 27 33 7 sec

50-minute cycle 45 55 12 sec

90-minute cycle 81 99 21 sec

10-minute cycle 9 11 2 sec

5 minutes 4.5 5.5 1 sec

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