Bryant 548J Installation and user guide

548J

SINGLE PACKAGE HEAT PUMP/ELECTRIC HEAT

NOMINAL 3 TO 8.5 TONS

WITH PURONR(R--410A) REFRIGERANT

Service and Maintenance Instructions

TABLE OF CONTENTS

SAFETY CONSIDERATIONS 1....................

UNIT ARRANGEMENT AND ACCESS 3...........

SUPPLY FAN (BLOWER) SECTION 4..............

HEAT PUMP REFRIGERATION SYSTEM 8.........

PURONR(R--410A) REFRIGERANT 13.............

COOLING CHARGING CHARTS 14................

CONVENIENCE OUTLETS 19....................

HEAT PUMP CONTROLS 20......................

PROTECTIVE CONTROLS 20.....................

COMMERCIAL DEFROST CONTROL 21...........

ELECTRIC HEATERS 24.........................

SMOKE DETECTORS 26.........................

RTU--MP CONTROL SYSTEM 33..................

ECONOMIZER SYSTEMS 47.....................

WIRING DIAGRAMS 56.........................

PRE--START-UP 58..............................

START-UP, GENERAL 58.........................

START-UP, RTU--MP CONTROL 59................

OPERATING SEQUENCE 62......................

FASTENER TORQUE VALUES 67.................

APPENDIX I. MODEL NUMBER SIGNIFICANCE 68...

APPENDIX II. PHYSICAL DATA 69................

APPENDIX III. FAN PERFORMANCE 71...........

APPENDIX IV. ELECTRICAL INFORMATION 82....

APPENDIX V. WIRING DIAGRAM LIST 96.........

APPENDIX VI. MOTORMASTER SENSOR

LOCATIONS 97.................................

UNIT START-UP CHECKLIST 99..................

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment

can be hazardous due to system pressure and electrical

components. Only trained and qualified service personnel

should install, repair, or service air-conditioning

equipment. Untrained personnel can perform the basic

maintenance functions of replacing filters. Trained service

personnel should perform all other operations.

When working on air-conditioning equipment, observe

precautions in the literature, tags and labels attached to

the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work

gloves. Use quenching cloth for unbrazing operations.

Have fire extinguishers available for all brazing

operations.

Follow all safety codes. Wear safety glasses and work

gloves. Use quenching cloth for brazing operations. Have

fire extinguisher available. Read these instructions

thoroughly and follow all warnings or cautions 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

CAUTION. These words are used with the safety--alert

symbol. DANGER identifies the most serious hazards

which will result in severe personal injury or death.

WARNING signifies a hazard which could result in

personal injury or death. CAUTION is used to identify

unsafe practices which may 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.

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal

injury or death.

Before performing service or maintenance operations

on unit, turn off main power switch to unit. Electrical

shock and rotating equipment could cause injury.

!WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal

injury or death.

Units with convenience outlet circuits may use

multiple disconnects. Check convenience outlet for

power status before opening unit for service. Locate

its disconnect switch, if appropriate, and open it.

Tag--out this switch, if necessary.

!WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could cause personal

injury, death and/or equipment damage.

Puron (R--410A) refrigerant systems operate at higher

pressures than standard R--22 systems. Do not use

R--22 service equipment or components on Puron

refrigerant equipment.

!WARNING

PERSONAL INJURY AND ENVIRONMENTAL

HAZARD

Failure to follow this warning could cause personal

injury or death. Relieve pressure and recover all

refrigerant before system repair or final unit disposal.

Wear safety glasses and gloves when handling

refrigerants. Keep torches and other ignition sources

away from refrigerants and oils.

!WARNING

CUT HAZARD

Failure to follow this caution may result in personal

injury.

Sheet metal parts may have sharp edges or burrs. Use

care and wear appropriate protective clothing, safety

glasses and gloves when handling parts and servicing

air conditioning units.

CAUTION

548J

UNIT ARRANGEMENT AND ACCESS

General

Fig. 1 and Fig. 2 show general unit arrangement and

access locations.

INDOOR BLOWER

ACCESS

CONTROL BOX

COMPRESSORS

(D08-09 only)

C09190

Fig. 1 -- Typical Access Panel Location (Front)

FILTER ACCESS PANEL

INDOOR COIL ACCESS PANEL

C08449

Fig. 2 -- Typical Access Panel Locations (Rear)

Routine Maintenance

These items should be part of a routine maintenance

program, to be checked every month or two, until a

specific schedule for each can be identified for this

installation:

Quarterly Inspection (and 30 days after initial start)

SReturn air filter replacement

SOutdoor hood inlet filters cleaned

SBelt tension checked

SBelt condition checked

SPulley alignment checked

SFan shaft bearing locking collar tightness checked

SOutdoor coil cleanliness checked

SCondensate drain checked

Seasonal Maintenance

These items should be checked at the beginning of each

season (or more often if local conditions and usage

patterns dictate):

Air Conditioning/Heat Pump

SOutdoor fan motor mounting bolts tightness

SCompressor mounting bolts

SOutdoor fan blade positioning

SControl box cleanliness and wiring condition

SWire terminal tightness

SRefrigerant charge level

SIndoor coil cleaning

SSupply blower motor amperage

Electric Heating

SPower wire connections

SFuses ready

SManual--reset limit switch is closed

Economizer or Outside Air Damper

SInlet filters condition

SCheck damper travel (economizer)

SCheck gear and dampers for debris and dirt

Air Filters and Screens

Each unit is equipped with return air filters. If the unit has

an economizer, it will also have an outside air screen. If a

manual outside air damper is added, an inlet air screen

will also be present.

Each of these filters and screens will need to be

periodically replaced or cleaned.

Return Air Filters

Return air filters are disposable fiberglass media type.

Access to the filters is through the small lift--out panel

located on the rear side of the unit, above the

evaporator/return air access panel. (See Fig. 1.)

To remove the filters:

1. Grasp the bottom flange of the upper panel.

2. Lift up and swing the bottom out until the panel dis-

engages and pulls out.

3. Reach inside and extract the filters from the filter

rack.

4. Replace these filters as required with similar replace-

ment filters of same size.

To re--install the access panel:

1. Slide the top of the panel up under the unit top panel.

2. Slide the bottom into the side channels.

3. Push the bottom flange down until it contacts the top

of the lower panel (or economizer top).

IMPORTANT: DO NOT OPERATE THE UNIT

WITHOUT THESE FILTERS!

548J

Outside Air Hood

Outside air hood inlet screens are permanent

aluminum--mesh type filters. Check these for cleanliness.

Remove the screens when cleaning is required. Clean by

washing with hot low--pressure water and soft detergent

and replace all screens before restarting the unit. Observe

the flow direction arrows on the side of each filter frame.

Economizer Inlet Air Screen

This air screen is retained by spring clips under the top

edge of the hood. (See Fig. 3.)

DIVIDER

BAROMETRIC

RELIEF

CLEANABLE

ALUMINUM

FILTER FILTER

HOOD

FILTER

CLIP

OUTSIDE

AIR

C08634

Fig. 3 -- Filter Installation

To remove the filter, open the spring clips. Re--install the

filter by placing the frame in its track, then closing the

spring clips.

Manual Outside Air Hood Screen

This inlet screen is secured by a retainer angle across the

top edge of the hood. (See Fig. 4.)

C07156

Fig. 4 -- Screens Installed on Outdoor--Air Hood

(Sizes 08D--09D Shown)

To remove the screen, loosen the screws in the top retainer

and slip the retainer up until the filter can be removed.

Re--install by placing the frame in its track, rotating the

retainer back down and tighten all screws.

SUPPLY FAN (BLOWER) SECTION

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal

injury or death.

Before performing service or maintenance operations

on the fan system, shut off all unit power and tag--out

the unit disconnect switch. Do not reach into the fan

section with power still applied to unit.

!WARNING

Supply Fan (Direct--Drive)

For unit sizes 04, 05 and 06, the Standard Static supply

fan system consists of a direct--drive forward--curved

centrifugal blower wheel attached to the motor shaft. The

motor has taps to provide the servicer with the selection of

one of five motor torque/speed ranges to best match wheel

performance with attached duct system. See Fig. 5 (548J

Direct--Drive Fan Assembly) and Fig. 6 (EMC Motor

Connectors).

EMC Motor

Motor Plug Position

(95° from vertical)

95°

EMC Power

Transformer

(460, 575v)

C09260

Fig. 5 -- 548J Direct--Drive Supply Fan Assembly

YEL

Gnd

GRN/YEL

BLU

12345

LGN

Motor

Power

Connections

Speed

Taps

Com

BRN

VIO

Default Connection

C09261

Fig. 6 -- EMC Motor Connectors

548J

460, 575-v Units

208/230-v Units

C09263

Fig. 7 -- EMC Unit Wiring

ECM Motor – The direct--drive motor is an X13

Electronically Commutated motor (ECM). An ECM

contains electronic circuitry to convert single--phase line

AC voltage into a 3--phase DC voltage to power the motor

circuit. The motor circuit is a DC brushless design with a

permanent magnet rotor. On the X13 design, the

electronic circuitry is integral to the motor assembly and

cannot be serviced or replaced separately.

208/230--v units use a 230--v motor. 460--v units use a

230--v motor with a stepdown transformer (mounted on

the end of the fan housing, see Fig. 5). 575--v units use a

460--v motor with an autotransformer. Motor power

voltage is connected to motor terminals L and N (see

Fig. 6 and Fig. 7); ground is connected at terminal G.

The motor power voltage is ALWAYS present; it is not

switched off by a motor contactor.

Motor operation is initiated by the presence of a 24--v

control signal to one of the five motor communications

terminals. When the 24--v signal is removed, the motor

will stop. The motor control signal is switched by the

defrost board’s IFO output.

Evaluating motor speed – The X13 ECM is a constant

torque motor design. The motor speed is adjusted by the

motor control circuitry to maintain the programmed shaft

torque. Consequently there is no specific speed value

assigned to each control tap setting. At the Position 5 tap,

the motor speed is approximately 1050 RPM (17.5 r/s) but

it will vary depending on fan wheel loading.

Selecting speed tap – The five communications terminals

are each programmed to provide a different motor torque

output. See Table 1. Factory default tap selection is

Position 1 for lowest torque/speed operation.

Table 1 – 548J Standard Static Motor Tap Programing

(percent of full--load torque)

Unit Size Ta p 1 Ta p 2 Ta p 3 Ta p 4 Ta p 5

04 32 38 45 50 100

05 46 58 61 69 100

06 73 82 85 90 100

Factory Default: Tap 1 (VIO)

To select another speed:

1. Disconnect main power to the unit.

2. Remove the motor signal lead (VIO) at the motor

communications terminal.

3. Reconnect the motor signal lead to the desired speed

terminal.

4. Connect main power to the unit.

Motor “rocking” on start--up – When the motor first starts,

the rotor (and attached wheel) will “rock” back and forth

as the motor tests for rotational direction. Once the correct

rotation direction is determined by the motor circuitry, the

motor will ramp up to specified speed. The “rocking” is a

normal operating characteristic of ECM motors.

Troubleshooting the ECM motor – Troubleshooting the

X13 ECM requires a voltmeter.

1. Disconnect main power to the unit.

2. Remove the motor power plug (including the control

BRN lead) and VIO control signal lead at the motor

terminals.

3. Restore main unit power.

4. Check for proper line voltage at motor power leads

BLK (from L terminal) and YEL (from N terminal).

548J

Table 2 – Motor Test Volts

Unit Voltage Motor Voltage Min---Max Volts

208/230 230 190--- 250

460 230 210--- 250

575 460 420--- 500

5. Apply a jumper at unit control terminals R to G to

initiate a demand for motor operation. Check for 24--v

output at defrost board terminal IFO.

6. Check for proper control signal voltage at motor

signal leads VIO and BRN. Signal should be 22 to

28--v.

7. Disconnect unit main power.

8. Reconnect motor power and control signal leads at

the motor terminals.

9. Restore unit main power.

Motor should start and run. If it does not, remove the

motor assembly. Replace with same motor part number;

do not substitute with an alternate design as torque/speed

programming will not be same as on original factory

motor.

Replacing the ECM Motor – Before removing the ECM

belly--band mounting ring, measure the distance between

the base of the motor shaft and the edge of the mounting

ring. Remove the motor mounting band and transfer to the

replacement motor. Position the mounting band at

distance measured in first step. Snug the mounting bolt

but do not tighten yet.

Insert the motor shaft into the fan wheel hub. Then secure

the three motor mount arms to the support cushions.

Torque the arm mounting screws to 60 in--lbs (6.8 N--m).

Center the fan wheel in the fan housing. Torque the fan

wheel hub setscrew to 120 in--lbs (13.6 N--m).

Ensure the motor terminals are located at a position below

the 3 o’clock position (see Fig. 5). Tighten the motor

belly--band bolt to 80 in--lbs (9.0 N--m).

Supply Fan (Belt--Drive)

The belt--drive supply fan system consists of a

forward--curved centrifugal blower wheel on a solid shaft

with two concentric type bearings, one on each side of the

blower housing. A fixed--pitch driven pulley is attached to

the fan shaft and an adjustable--pitch driver pulley is on

the motor. The pulleys are connected using a “V” type

belt. (See Fig. 8.)

C07087

Fig. 8 -- Belt Drive Motor Mounting

Belt

Check the belt condition and tension quarterly. Inspect the

belt for signs of cracking, fraying or glazing along the

inside surfaces. Check belt tension by using a spring--force

tool (such as Browning’s Part Number “Belt Tension

Checker” or equivalent tool); tension should be 6--lbs at a

5/8--in. deflection when measured at the centerline of the

belt span. This point is at the center of the belt when

measuring the distance between the motor shaft and the

blower shaft.

NOTE: Without the spring--tension tool, place a straight

edge across the belt surface at the pulleys, then deflect the

belt at mid--span using one finger to a 1/2--in. deflection.

Adjust belt tension by loosening the motor mounting plate

front bolts and rear bolt and sliding the plate toward the

fan (to reduce tension) or away from fan (to increase

tension). Ensure the blower shaft and the motor shaft are

parallel to each other (pulleys aligned). Tighten all bolts

when finished.

To replace the belt:

1. Use a belt with same section type or similar size. Do

not substitute a “FHP” type belt. When installing the

new belt, do not use a tool (screwdriver or pry--bar) to

force the belt over the pulley flanges, this will stress

the belt and cause a reduction in belt life.

2. Loosen the motor mounting plate front bolts and rear

bolts.

3. Push the motor and its mounting plate towards the

blower housing as close as possible to reduce the cen-

ter distance between fan shaft and motor shaft.

4. Remove the belt by gently lifting the old belt over

one of the pulleys.

5. Install the new belt by gently sliding the belt over

both pulleys and then sliding the motor and plate

away from the fan housing until proper tension is

achieved.

6. Check the alignment of the pulleys, adjust if necessary.

7. Tighten all bolts.

8. Check the tension after a few hours of runtime and

re--adjust as required.

548J

Adjustable--Pitch Pulley on Motor

The motor pulley is an adjustable--pitch type that allows a

servicer to implement changes in the fan wheel speed to

match as--installed ductwork systems. The pulley consists

of a fixed flange side that faces the motor (secured to the

motor shaft) and a movable flange side that can be rotated

around the fixed flange side that increases or reduces the

pitch diameter of this driver pulley. (See Fig. 9.)

C07075

Fig. 9 -- Supply--Fan Pulley Adjustment

As the pitch diameter is changed by adjusting the position

of the movable flange, the centerline on this pulley shifts

laterally (along the motor shaft). This creates a

requirement for a realignment of the pulleys after any

adjustment of the movable flange. Also reset the belt

tension after each realignment.

Check the condition of the motor pulley for signs of wear.

Glazing of the belt contact surfaces and erosion on these

surfaces are signs of improper belt tension and/or belt

slippage. Pulley replacement may be necessary.

To change fan speed:

1. Shut off unit power supply.

2. Loosen belt by loosening fan motor mounting nuts.

(See Fig. 8.)

3. Loosen movable pulley flange setscrew. (See Fig. 9.)

4. Screw movable flange toward fixed flange to increase

speed and away from fixed flange to decrease speed.

Increasing fan speed increases load on motor. Do not

exceed maximum speed specified.

5. Set movable flange at nearest keyway of pulley hub

and tighten setscrew to torque specifications.

To align fan and motor pulleys:

1. Loosen fan pulley setscrews.

2. Slide fan pulley along fan shaft. Make angular align-

ment by loosening motor from mounting.

3. Tighten fan pulley setscrews and motor mounting

bolts to torque specifications.

4. Recheck belt tension.

Bearings

This fan system uses bearings featuring concentric split

locking collars. The collars are tightened through a cap

screw bridging the split portion of the collar. The cap

screw has a Torx T25 socket head. To tighten the locking

collar: Hold the locking collar tightly against the inner

race of the bearing and torque the cap screw to 65--70

in--lb (7.4--7.9 Nm). See Fig. 10.

C08121

Fig. 10 -- Tightening Locking Collar

Motor

When replacing the motor, also replace the external--tooth

lock washer (star washer) under the motor mounting base;

this is part of the motor grounding system. Ensure the

teeth on the lock washer are in contact with the motor’s

painted base. Tighten motor mounting bolts to 120 +/-- 12

in--lbs.

Changing fan wheel speed by changing pulleys: The

horsepower rating of the belt is primarily dictated by the

pitch diameter of the smaller pulley in the drive system

(typically the motor pulley in these units). Do not install a

replacement motor pulley with a smaller pitch diameter

than provided on the original factory pulley. Change fan

wheel speed by changing the fan pulley (larger pitch

diameter to reduce wheel speed, smaller pitch diameter to

increase wheel speed) or select a new system (both

pulleys and matching belt(s)).

Before changing pulleys to increase fan wheel speed,

check the fan performance at the target speed and airflow

rate to determine new motor loading (bhp). Use the fan

performance tables or use the Packaged Rooftop Builder

software program. Confirm that the motor in this unit is

capable of operating at the new operating condition. Fan

shaft loading increases dramatically as wheel speed is

increased.

To reduce vibration, replace the motor’s adjustable pitch

pulley with a fixed pitch pulley (after the final airflow

balance adjustment). This will reduce the amount of

vibration generated by the motor/belt--drive system.

548J

HEAT PUMP REFRIGERATION

SYSTEM

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could cause personal

injury, death and/or equipment damage.

This system uses PuronRrefrigerant which has

higher pressures than R--22 and other refrigerants. No

other refrigerant may be used in this system. Gauge

set, hoses, and recovery system must be designed to

handle Puron refrigerant. If unsure about equipment,

consult the equipment manufacturer.

!WARNING

Outdoor Coil

The 548J outdoor coil is fabricated with round tube

copper hairpins and plate fins of various materials and/or

coatings (see “Appendix I -- Model Number Significance”

to identify the materials provided in this unit). All unit

sizes use composite--type two--row coils. Composite

two--row coils are two single--row coils fabricated with a

single return bend end tubesheet.

Indoor Coil

The indoor coil is traditional round--tube, plate--fin

technology. Tube and fin construction is of various

optional materials and coatings (see Model Number

Format). Coils are multiple--row.

Outdoor Coil Maintenance and Cleaning

Recommendation

Routine cleaning of coil surfaces is essential to maintain

proper operation of the unit. Elimination of contamination

and removal of harmful residues will greatly increase the

life of the coil and extend the life of the unit. The

following maintenance and cleaning procedures are

recommended as part of the routine maintenance activities

to extend the life of the coil.

Remove Surface Loaded Fibers

Surface loaded fibers or dirt should be removed with a

vacuum cleaner. If a vacuum cleaner is not available, a

soft non--metallic bristle brush may be used. In either

case, the tool should be applied in the direction of the fins.

Coil surfaces can be easily damaged (fin edges can be

easily bent over and damage the coating of a protected

coil) if the tool is applied across the fins.

NOTE: Use of a water stream, such as a garden hose,

against a surface loaded coil will drive the fibers and dirt

into the coil. This will make cleaning efforts more

difficult. Surface loaded fibers must be completely

removed prior to using low velocity clean water rinse.

Periodic Clean Water Rinse

A periodic clean water rinse is very beneficial for coils

that are applied in coastal or industrial environments.

However, it is very important that the water rinse is made

with very low velocity water stream to avoid damaging

the fin edges. Monthly cleaning as described below is

recommended.

PERSONAL INJURY AND UNIT DAMAGE

HAZARD

Failure to follow this caution may result in personal

injury or equipment damage.

Only approved cleaning is recommended.

CAUTION

Routine Cleaning of Indoor Coil Surfaces

Periodic cleaning with Totaline®environmentally sound

coil cleaner is essential to extend the life of coils. This

cleaner is available from our Replacement Components

Division as part number P902--0301 for one gallon

container, and part number P902--0305 for a 5 gallon

container. It is recommended that all coils, including

standard aluminum, pre--coated, copper/copper or

E--coated coils be cleaned with the Totaline

environmentally sound coil cleaner as described below.

Coil cleaning should be part of the unit’s regularly

scheduled maintenance procedures to ensure long life of

the coil. Failure to clean the coils may result in reduced

durability in the environment.

Avoid the use of

Scoil brighteners

Sacid cleaning prior to painting

Shigh pressure washers

Spoor quality water for cleaning

Totaline environmentally sound coil cleaner is

nonflammable, hypoallergenic, non bacterial, and a

USDA accepted biodegradable agent that will not harm

the coil or surrounding components such as electrical

wiring, painted metal surfaces, or insulation. Use of

non--recommended coil cleaners is strongly discouraged

since coil and unit durability could be affected.

Clean coil as follows:

1. Turn off unit power, tag disconnect.

2. Remove top panel screws on outdoor coil end of unit.

3. Remove coil corner post. See Fig. 11. To hold top

panel open, place coil corner post between top panel

and center post. See Fig. 12.

548J

OUTDOOR

COIL

C09219

Fig. 11 -- Cleaning Condenser Coil (Size 04--07 shown)

C08206

Fig. 12 -- Propping Up Top Panel

4. For Sizes 04--07: Remove screws securing coil to

compressor plate and compressor access panel.

5. For Sizes 08--09: Remove fastener holding coil sec-

tions together at return end of condenser coil. Care-

fully separate the outdoor coil section 3 to 4 in. from

the inner coil section. See Fig. 13.

OUTDOOR

COIL

C09220

Fig. 13 -- Separating Coil Sections

6. Use a water hose or other suitable equipment to flush

down between the 2 coil sections to remove dirt and

debris. Clean the outer surfaces with a stiff brush in

the normal manner.

7. Secure inner and outer coil rows together with a

field--supplied fastener.

8. Reposition the outer coil section and remove the coil

corner post from between the top panel and center

post. Reinstall the coil corner post and replace all

screws.

Totaline Environmentally Sound Coil Cleaner

Application Equipment

S21/2gallon garden sprayer

SWater rinse with low velocity spray nozzle

UNIT DAMAGE HAZARD

Failure to follow this caution may result in corrosion

and damage to the unit.

Harsh chemicals, household bleach or acid or basic

cleaners should not be used to clean outdoor or indoor

coils of any kind. These cleaners can be very difficult

to rinse out of the coil and can accelerate corrosion at

the fin/tube interface where dissimilar materials are in

contact. If there is dirt below the surface of the coil,

use the Totaline environmentally sound coil cleaner as

described above.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in reduced

unit performance.

High velocity water from a pressure washer, garden

hose, or compressed air should never be used to clean

a coil. The force of the water or air jet will bend the

fin edges and increase airside pressure drop.

CAUTION

Totaline Environmentally Sound Coil Cleaner

Application Instructions

1. Proper eye protection such as safety glasses is recom-

mended during mixing and application.

2. Remove all surface loaded fibers and dirt with a vacu-

um cleaner as described above.

3. Thoroughly wet finned surfaces with clean water and

a low velocity garden hose, being carefull not to bend

fins.

4. Mix Totaline environmentally sound coil cleaner in a

21/2gallon garden spryer according to the instruc-

tions included with the cleaner. The optimum solution

temperature is 100°F(38°C).

NOTE: Do NOT USE water in excess of 130°F(54°C), as

the enzymatic activity will be destroyed.

5. Thoroughly apply Totaline environmentally sound

coil cleaner solution to all coil surfaces including

finned area, tube sheets and coil headers.

6. Hold garden sprayer nozzle close to finned areas and

apply cleaner with a vertical, up--and--down motion.

548J

Avoid spraying in horizontal pattern to minimize poten-

tial for fin damage.

7. Ensure cleaner thoroughly penetrates deep into finned

areas.

8. Interior and exterior finned areas must be thoroughly

cleaned.

9. Finned surfaces should remain wet with cleaning

solution for 10 minutes.

10. Ensure surfaces are not allowed to dry before rinsing.

Reapply cleaner as needed to ensure 10--minute satur-

ation is achieved.

11. Thoroghly rinse all surfaces with low velocity clean

water using downward rinsing motion of water spray

nozzle. Protect fins from damage from the spray

nozzle.

Indoor Coil

Cleaning the Indoor Coil

1. Turn unit power off. Install lockout tag. Remove in-

door coil access panel.

2. If economizer or two--position damper is installed, re-

move economizer by disconnecting Molex plug and

removing mounting screws.

3. Slide filters out of unit.

4. Clean coil using a commercial coil cleaner or dish-

washer detergent in a pressurized spray canister. Wash

both sides of coil and flush with clean water. For best

results, back--flush toward return--air section to re-

move foreign material. Flush condensate pan after

completion.

5. Reinstall economizer and filters.

6. Reconnect wiring.

7. Replace access panels.

Refrigeration System Components

Each heat pump refrigeration system includes a

compressor, accumulator, reversing valve, dual--function

outdoor coil with vapor header check valve, cooling liquid

line with filter drier and check valve, dual--function

indoor coil with vapor header check valve, and heating

liquid line with check valve and strainer. Unit sizes

04A--07A have a single compressor--circuit; unit sizes

08D and 09D have two compressor--circuits. See Fig. 14

for typical unit piping schematic (unit size 09D (4--row

indoor coil) with two compressor--circuits is depicted).

Dual--function outdoor and indoor coils are designed to

provide parallel coil circuits during evaporator--function

operation and converging coil circuits during

condenser--function operation.

Refrigerant flow metering in the evaporator--function

sequence is provided by multiple Acutrols – fixed--bore

metering devices that are located in the tee nipples

between the liquid header and the entrance to each coil

circuit. The Acutrol metering device is swaged into the

nipple tube between the liquid header end and the

side--port tube. See Fig. 15. During evaporator--function

operation, flow is straight through the nipple and into each

evaporator circuit. Flow continues through the parallel

evaporator circuits and into the vapor header.

COMPRESSOR

ACCUMULATOR

HPS

COMPRESSOR

ACCUMULATOR

HPS

Filter

Drier 2B

LPS/LOC

Acutrol DFT 1

Cooling Liquid Lines

DFT 2

Outdoor Coil

Indoor Coil

Comp 2

Comp 1

1C Strainer

Heating Mode Liquid Lines

Acutrol

C09228

Fig. 14 -- Typical Unit Piping Schematic (09D unit with 4--row indoor coil)

548J

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