Bryant 524J User Manual

524J

Packaged Air-Handling Units
60 Hz
with Puron® (R-410A) Refrigerant
Sizes 07, 08, 12, 14, 16

Installation, Start-Up and

Service Instructions

TABLE OF CONTENTS

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

PRE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Moving and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Rigging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Uncrating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Unit Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Unit Isolation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Refrigerant Piping Access . . . . . . . . . . . . . . . . . . . . . . . 11

Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Fan Motors and Drives . . . . . . . . . . . . . . . . . . . . . . . . . 15

Power Supply and Wiring . . . . . . . . . . . . . . . . . . . . . . . 16

Connecting Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-33

Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Fan Motor Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . 20

Fan Shaft Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Centering Fan Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Fan Shaft Position Adjustment . . . . . . . . . . . . . . . . . . . 21

Individual Fan Wheel Adjustment . . . . . . . . . . . . . . . . 21

Fan Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Fan Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Fan Pulley Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Pulley and Drive Adjustment . . . . . . . . . . . . . . . . . . . . 22

Condensate Drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Coil Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Cleaning Cooling Coil . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Cleaning Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Replacing Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . CL-1, CL-2

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock
or other conditions which may cause 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 package

Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloths for brazing operations and have a fire
extinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult
local building codes and appropriate national electrical codes
(in USA, ANSI/NFPA70, National Electrical Code (NEC); in
Canada, CSA C22.1) for special requirements.

It is important to 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,
CAUTION, and NOTE. These words are used with the safety­alert symbol. DANGER 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 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 SHOCK HAZARD

Failure to follow this warning could cause personal injury
or death.

Before performing service or maintenance operations on
unit, always turn off main power switch to unit and install
lockout tag. Unit may have more than one power switch.

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.

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.

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 524J units.

UNIT OPERATION HAZARD

Failure to follow this caution could cause equipment
damage.

Ensure voltage listed on unit data plate agrees with
electrical supply provided for the unit.

PRE-INSTALLATION

1. The power supply (v, ph, and Hz) must correspond to that
specified on unit rating plate.

2. The electrical supply provided by the utility must be suf­ficient to handle load imposed by this unit.

3. Refer to Installation, General section (page 2) and
Fig. 1A and Fig. 1B for locations of electrical inlets, con­densate drain, duct connections, and required clearances
before setting unit in place.

4. This installation must conform with local building codes
and with the NEC (National Electrical Code) or ANSI
(American National Standards Institute)/NFPA (National
Fire Protection Association) latest revision. Refer to
provincial and local plumbing or wastewater codes and
other applicable local codes.

Moving and Storage — To transfer unit from truck to

storage site, use a fork truck. Do not stack units more than
2 high during storage. If unit is to be stored for more than
2 weeks before installation, choose a level, dry storage site free
from vibration. Do not remove plastic wrap or skid from unit
until final installation.

Rigging — All 524J Series units can be rigged by using the

shipping skid. Units are shipped fully assembled. Do not
remove shipping skids or protective covering until unit is ready
for final placement; damage to bottom panels can result. Use
slings and spreader bars as applicable to lift unit.

INSTALLATION

General — Allow 2

clearance and airflow. For units equipped with an economizer,
refer to the accessory installation instructions for additional
clearance requirements. Be sure floor, wall, or ceiling can
support unit weight (Tables 1A – 1D). See Fig. 1A and Fig. 1B
for dimensions.

Uncrating — Move unit as near as possible to final

location before removing shipping skid.
Remove metal banding, top skid, and plastic wrap. Examine

unit for shipping damage. If shipping damage is evident, file
claim with transportation agency. Remove base skid just prior
to actual installation.

Check nameplate information against available power supply
and model number description in Fig. 2.

NOTE: Be sure to remove the styrofoam shipping pad from
the thermostatic expansion valve (TXV). Verify that it has
been removed. See Fig. 3.

Accessories — Refer to instructions shipped with each

accessory for specific information.

1

/2 ft at front and side of unit for service

2

Table 1A — 524J***A Physical Data, English — Cooling Units

UNIT 524J* 07A 08A 12A 14A 16A

8

2

2

1

2250-

3750

1...11/

/

2

8

2

1

/

2

10 121/

3000-

5000

2...11/

8

1

/4 ODM/1 IDF

3750-

6250

2...11/

2...5/

1...21/

1..11/

2

8

8

2

2

15

4500-

7500

2...11/

8

1...2

1...2

4...16 x 20 x 2

4...16 x 24 x 2

NOMINAL CAPACITY (Tons) 67
OPERATING WEIGHT (lb)

Base Unit with TXV 381 385 405 670 685
Plenum 175 175 175 225 225

FANS

Qty...Diam. (in.) 1...15 1...15 1...15 2...15 2...15
Nominal Airflow (cfm) 2400 3000 4000 5000 6000

Airflow Range (cfm)

1800-

3000

Nominal Motor Hp (Standard Motor)

208/230-1-60 1.3 2.4 — — —
208/230-3-60 and 460-3-60 2.4 2.4 2.4 2.9 3.7
575-3-60 1.0 2.0 2.0 3.0 3.0

Motor Speed (rpm)

208/230-1-60 1725 1725 — — —
208/230-3-60 and 460-3-60 1725 1725 1725 1725 1725
575-3-60 1725 1725 1725 1725 1725

REFRIGERANT R-410A

Operating charge (lb)
(approx per circuit

†

3.0 3.0 1.5/1.5 2.0/2.0 2.5/2.5

DIRECT-EXPANSION COIL Enhanced Copper Tubes, Aluminum Sine-Wave Fins

Max Working Pressure (psig) 450
Face Area (sq ft) 6.67 8.33 10.0 13.25 17.67
No. of Splits 11 2 2 2
No. of Circuits per Split 12 15 9 12 16
Split Type...Percentage — — Face...50/50
Fins/in. 15 15 15 15 15

PIPING CONNECTIONS,

Quantity...Size (in.)

DX Coil — Suction (ODF) 1...1

1

/

8

DX Coil — Liquid Refrigerant (ODF) 1...5/
Steam Coil, In (MPT) 1...21/
Steam Coil, Out (MPT) 1...11/
Hot Water Coil, In (MPT) 1...11/
Hot Water Coil, Out (MPT) 1...1
Condensate (PVC) 1...1

FILTERS Throwaway — Factory Supplied

Quantity...Size (in.) 4...16 x 24 x 2

Access Location Either Side

STEAM COIL**

Max Working Pressure (psig at 260°F) 20
Total Face Area (sq ft) 6.67 6.67 6.67 13.33 13.33
Rows...Fins/in. 1...9 1...9 1...9 1...10 1...10

HOT WATER COIL**

Max Working Pressure (psig) 150
Total Face Area (sq ft) 6.67 6.67 6.67 13.33 13.33
Rows...Fins/in. 2...8.5 2...8.5 2...8.5 2...8.5 2...8.5
Water Volume

(gal) 8.3 13.9

3

(ft

) 1.1 1.85

LEGEND

DX — Direct Expansion
TXV — Thermostatic Expansion Valve

†

Units are shipped without refrigerant charge.

** Field installed accessory only.

3

Table 1B — 524J***A Physical Data, SI — Cooling Units

UNIT 524J* 07A 08A 12A 14A 16A
NOMINAL CAPACITY (kW) 21 26 35 43 52
OPERATING WEIGHT (kg)

Base Unit with TXV 173 175 184 304 311
Plenum 80 80 80 102 102

FANS

Qty...Diam. (mm) 1...381 1...381 1...381 2...381 2...381
Nominal Airflow (L/s) 1133 1604 1888 2360 2831
Airflow Range (L/s) 850-1416 1203-2006 1416-2360 1770-2949 2124-3539
Nominal Motor kW (Standard Motor)

208/230-1-60 0.97 1.79 — — —
208/230-3-60 and 460-3-60 1.79 1.79 1.79 2.16 2.16
575-3-60 0.75 1.49 1.49 2.24 2.24

Motor Speed (r/s)

208/230-1-60 28.8 28.8 — — —
208/230-3-60 and 460-3-60 28.8 28.8 28.8 28.8 28.8
575-3-60 28.8 28.8 28.8 28.8 28.8

REFRIGERANT R-410A

Operating charge (kg)
(approx per circuit)

†

DIRECT-EXPANSION COIL Enhanced Copper Tubes, Aluminum Sine-Wave Fins

Max Working Pressure (kPag) 3102
Face Area (sq m) 0.62 0.77 0.93 0.93 1.64
No. of Splits 11 2 2 2
No. of Circuits per Split 12 15 9 12 16
Split Type...Percentage — — Face...50/50
Fins/m 591 591 670 591 591

PIPING CONNECTIONS,

Quantity...Size (in.)

DX Coil — Suction (ODF) 1...1
DX Coil — Liquid Refrigerant (ODF) 1...5/
Steam Coil, In (MPT) 1...21/
Steam Coil, Out (MPT) 1...11/
Hot Water Coil, In (MPT) 1...11/
Hot Water Coil, Out (MPT) 1...1
Condensate (PVC) 1...1

FILTERS Throwaway — Factory Supplied

Quantity...Size 4...406 x 610 x 51

Access Location Either Side

STEAM COIL**

Max Working Pressure (kPag at 126°C) 138
Total Face Area (sq m) 0.62 0.62 0.62 1.24 1.24
Rows...Fins/m 1...355 1...355 1...355 1...394 1...394

HOT WATER COIL**

Max Working Pressure (kPag) 1034
Total Face Area (sq m) 0.62 0.62 0.62 1.24 1.24
Rows...Fins/m 2...335 2...335 2...335 2...335 2...335
Water Volume

(L) 31.4 52.6

3

(m

) 0.031 0.052

LEGEND

DX — Direct Expansion
TXV — Thermostatic Expansion Valve

†

Units are shipped without refrigerant charge.

** Field installed accessory only.

1.36 1.36 0.68/0.68 0.90/0.90 1.13/1.13

1

/

8

8

2

2

1...11/

8

2

1

/

2

2...11/

8

1

/4 ODM/1 IDF

2...11/

8

2...5/

8

1...21/

2

1..11/

2

1...2

1...2

4...406 x 508 x 51

4...406 x 610 x 51

2...11/

8

4

Table 1C — 524J***H Physical Data, English — Heat Pump Units

UNIT 524J* 07H 08H 12H
NOMINAL CAPACITY (Tons)

67

OPERATING WEIGHT (lb)

Base Unit with TXV 385 385 427
Plenum 175 175 175

FANS

Qty...Diam. (in.) 1...15 1...15 1...15
Nominal Airflow (cfm) 2400 3000 4000
Airflow Range (cfm) 1800-3000 2250-3750 3000-5000
Nominal Motor Hp (Standard Motor)

208/230-1-60 1.3 2.4 —
208/230-3-60 and 460-3-60 2.4 2.4 2.4
575-3-60 1.0 2.0 2.0

Motor Speed (rpm)

208/230-1-60 1725 1725 —
208/230-3-60 and 460-3-60 1725 1725 1725
575-3-60 1725 1725 1725

REFRIGERANT

Operating charge (lb)
(approx per circuit)

†

DIRECT-EXPANSION COIL

3.0 3.0 2.0/2.0

Enhanced Copper Tubes, Aluminum Sine-Wave Fins

Max Working Pressure (psig) 450
Face Area (sq ft) 8.33 8.33 10.0
No. of Splits 112
No. of Circuits per Split 15 15 9
Split Type...Percentage ———
Rows...Fins/in. 3...15 3...15 3...15

PIPING CONNECTIONS,

Quantity...Size (in.)

DX Coil — Suction (ODF) 1...1
DX Coil — Liquid Refrigerant (ODF) 1...5/
Steam Coil, In (MPT) 1...21/
Steam Coil, Out (MPT) 1...11/
Hot Water Coil, In (MPT) 1...11/
Hot Water Coil, Out (MPT) 1...11/

1

/

8

8

2
2
2
2

Condensate (PVC) 1...11/4 ODM/1 IDF

FILTERS

Quantity...Size (in.) 4...16 x 24 x 2
Access Location Either Side

STEAM COIL**

Max Working Pressure (psig at 260°F)
Total Face Area (sq ft) 6.67 6.67 6.67
Rows...Fins/in. 1...9 1...9 1...9

HOT WATER COIL**

Max Working Pressure (psig) 150
Total Face Area (sq ft) 6.67 6.67 6.67
Rows...Fins/in. 2...8.5 2...8.5 2...8.5
Water Volume

(gal)

3

) 1.1

(ft

LEGEND

DX — Direct Expansion
TXV — Thermostatic Expansion Valve

†

Units are shipped without refrigerant charge.

** Field installed accessory only.

1

/

2

R-410A

1...11/

8

1...5/

8

1...21/

2

1...11/

2

1...11/

2

1...11/

2

Throwaway —

Factory Supplied

20

8.3

10

2...11/

2...5/

1...21/

1...11/

1...11/

1...11/

8

8

2
2
2
2

5

Table 1D —524J***H Physical Data, SI — Heat Pump Units

UNIT 524J* 07H 08H 12H
NOMINAL CAPACITY (kW)

OPERATING WEIGHT (kg)

Base Unit with TXV 175 175 194
Plenum 80 80 80

FANS

Qty...Diam. (mm) 1...381 1...381 1...381
Nominal Airflow (L/s) 1133 1604 1888
Airflow Range (L/s) 850-1416 1203-2006 1416-2360
Nominal Motor kW (Standard Motor)

208/230-1-60 0.97 1.79 —
208/230-3-60 and 460-3-60 1.79 1.79 1.79
575-3-60 0.75 1.49 1.49

Motor Speed (r/s)

208/230-1-60 28.8 28.8 —
208/230-3-60 and 460-3-60 28.8 28.8 22.8
575-3-60 28.8 28.8 22.8

REFRIGERANT

Operating charge (kg)
(approx per circuit)

†

DIRECT-EXPANSION COIL

Max Working Pressure (kPag) 3102
Face Area (sq m) 0.77 0.77 0.93
No. of Splits 112
No. of Circuits per Split 12 15 9
Split Type...Percentage ———
Rows...Fins/m 3...591 3...591 3...591

PIPING CONNECTIONS,

Quantity...Size (in.)

DX Coil — Suction (ODF) 1...1
DX Coil — Liquid Refrigerant (ODF) 1...5/
Steam Coil, In (MPT) 1...21/
Steam Coil, Out (MPT) 1...11/
Hot Water Coil, In (MPT) 1...11/
Hot Water Coil, Out (MPT) 1...11/
Condensate (PVC) 1...11/4 ODM/1 IDF

FILTERS

Quantity...Size (mm) 4...406 x 610 x 51
Access Location Either Side

STEAM COIL**

Max Working Pressure (kPag at 126°C) 138
Total Face Area (sq m) 0.62 0.62 0.62
Rows...Fins/m 1...355 1...355 1...355

HOT WATER COIL**

Max Working Pressure (kPag) 1034
Total Face Area (sq m) 0.62 0.62 0.62

Rows...Fins/m 2...335 2...335

Water Volume

(L) 31.4

3

(m

) 0.031

LEGEND

DX — Direct Expansion
TXV — Thermostatic Expansion Valve

†

Units are shipped without refrigerant charge.

** Field installed accessory only.

21 26 35

R-410A

1.36 1.36 0.91/0.91

Enhanced Copper Tubes, Aluminum Sine-Wave Fins

1

/

8

8

2
2
2
2

1...11/

8

1...5/

8

1...21/

2

1...11/

2

1...11/

2

1...11/

2

Throwaway —

Factory Supplied

2...11/

2...5/

1...21/

1...11/

1...11/

1...11/

8

8

2
2
2
2

2...335

6

LEGEND

TXV — Thermostatic Expansion Valve
NOTES:

1. Dimensions in [ ] are in millimeters.

2. Direction of airflow.

3. Recommended clearance:

• Rear: 3 in. [76 mm]

• Front: 2 ft, 6 in. [762 mm]

• Right Side: 2 ft, 6 in. [762 mm]

• Left Side: 2 ft, 6 in. [762 mm]

• Local codes or jurisdiction may prevail.

4. Liquid piping not supplied by Bryant.

5. Duct flange is factory supplied and field
installed.

UNIT

UNIT WEIGHT

lb (kg)
524J*07A 381 (173)
524J*08A 385 (175)
524J*12A 405 (184)
524J*07H 385 (175)
524J*08H 385 (175)
524J*12H 427 (194)

Fig. 1A — Dimensions – Sizes 07 - 12

7

LEGEND

TXV — Thermostatic Expansion Valve
NOTES:

1. Dimensions in [ ] are in millimeters.

2. Direction of airflow.

3. Recommended clearance:

• Rear: 3 in. (76 mm)

• Front: 2 ft, 6 in. (762 mm)

• Right Side: 2 ft, 6 in. (762 mm)

• Left Side: 2 ft, 6 in. (762 mm)

• Local codes or jurisdiction may
prevail.

4. Liquid piping not supplied by Bryant.

5. Duct flange is factory-supplied and field-

installed.

UNIT

UNIT WEIGHT

lb (kg)
524J*14A 670 (304)
524J*16A 685 (331)

Fig. 1B — Dimensions – Sizes 14 and 16

8

1234567891011121314151617

5 2 4 J E 1 4 A 0 0 0 A 2 0 A A A

_____________

Model Type

Packa ging

524J = Bryant Fan Coil
Puronr R---410A Refrigerant

A=Standard

Typ e o f C oil

Service Options

B = High Capacity DX Coil
H = DX Coil for Heat Pump Duty

A = Standard DX Coil

A=None

B = Painted Cabinet

Indoor Fan Options

1 = Fan Drive and Motor - Low / Motor Efficency - Standard
2 = Fan Drive and Motor - Med / Motor Efficency - Standard

Not Used

A = Not Used

Not Used

0 = Not Used

Not Used

0 = Not Used

Coil Options

A=Al/Cu

Not Used

0 = Not Used

Not Used

0 = Not Used

3 = Fan Drive and Motor - High / Motor Efficency - Standard

Voltage

E = 460/3/60

P = 208/ 230/3/60 (Size 16 and Indoor Fan 3 Units Only)

J = 208/ 230/1/60 (07 and 08 Units Only)

T = 575/3/60

____

Nominal Tonnage

07 = 6 Tons
08 = 7.5 Tons

14 = 12.5 Tons

12 = 10 Tons

16 = 15 Tons

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POSITION NUMBER
TYPICAL

Year of manufacture (”08” = 2008)3−4

LEGEND

TXV — Thermostatic Expansion Valve

Fig. 2 — Model Number Nomenclature

Fig. 3 — Serial Number Nomenclature

Fig. 4 — Foam Block Location

9

Unit Positioning — The unit can be mounted on the

LEGEND

Accessory Line

Alternate Air Intake and Discharge

Air Intake and Discharge

Note:

Maintain recommended clearances
per Figs. 1A–1B

UNIT SIZES 14 - 16

NOTE: Dimensions in [ ] are millimeters

UNIT SIZES 07 - 12

OVERHEAD SUSPENSION ACCESSORY

floor for vertical application with return air entering the face of
the unit and supply air discharging vertically through the top of
the unit. The unit can also be applied in a horizontal
arrangement with return air entering horizontally and the
supply air discharging horizontally. When applying the unit in
a horizontal arrangement, ensure the condensate drain pan is
located at the bottom center of the unit for adequate condensate
disposal. See Fig. 5 for condensate connections for each unit
position.

Typical positioning and alternate return air locations are shown
in Fig. 5. Alternate return air locations can be used by moving
the unit panel from the alternate return air location to the
standard return air location. Refer to overhead suspension
accessory drawing (Fig. 6) for preferred suspension technique.
The unit needs support underneath to prevent sagging.

IMPORTANT: Do NOT attempt to install unit with return
air entering top panel of unit. Condensate will not drain
from unit.

Fig. 5 — Typical Unit Positioning

Fig. 6 — Preferred Suspension Technique

10

Unit Isolation — Where extremely quiet operation is

UNIT

USE HOLE
NUMBERS

524J*07A, 08A
524J*07H, 08H

1, 3

524J*12A, 14A, 16A

524J*12H

1, 2, 3, 4

essential, install isolators between floor and base of unit, or
between ceiling and top section of unit.

Be sure that unit is level and adequately supported. Use
channels at front and sides of unit for reference points when
leveling.

Refrigerant Piping Access — The 524J Series units

come with standard knockouts for refrigerant piping. These
knockouts are located on both sides of the unit for installation
flexibility. The standard knockouts provide sufficient access to
the unit’s coils for all 524J*07A, 08A, 12A, 14A and 16A units
as well as the 524J*07H, 08H, 12H units. See Fig. 7 for the
positions. Recommended access hole use is also listed for all
units. Note that Fig. 7 shows the access holes on the control­box side of the unit; this is the side of the unit with the coil
headers, so it is used most often for piping access.

IMPORTANT: Do not bury refrigerant piping underground.

Refrigerant Piping — See Tables 1A – 1D for refriger-

ant pipe connection sizes. For ease in brazing, it is recommend­ed that all internal solder joints be made before unit is placed in
final position.

The 524J direct-expansion units have internal
factory-installed thermostatic expansion valves (TXVs),

distributors, and nozzles for use with R-410A. See Table 2
for part numbers. Knockouts are provided in the unit corner
posts for 524J refrigerant piping. See Fig. 7, which also lists
recommended knockouts and access holes to use for each
524J unit size. Recommended fittings are listed in Table 3.

The sensor bulb capillary tubes must be routed from the TXVs
inside the unit through one of the piping access holes. Clamp
the TXV sensor bulb on a vertical portion of the suction line,
outside the unit. See Fig. 8.

NOTE: Be sure to remove the styrofoam shipping pad from
the TXV. Verify that it has been removed. See Fig. 4.

IMPORTANT: Never attach the sensor to the suction
manifold. Do NOT mount the sensor on a trapped portion
of the suction line.

The 524J Series evaporator coils have a face-split design.
Ensure that lower circuit of coil is first on/last off when
connected to the condensing unit and/or system controls. See
Fig. 8.

External TXV equalizer connections are provided and
factory-brazed into the coil suction manifolds.

If suction line must be horizontal, clamp bulb to suction line at
least 45 degrees above bottom, at approximately the 4 o’clock
or 8 o’clock position. See Fig. 9.

4
3

2
1

Fig. 7 — Refrigerant Piping Access Holes

11