HORIZONTAL INDOOR

SINGLE PACKAGE

COOLING UNITS

Model 502A

CeilingPAC

2 to 5 Tons

Single Package Cooling Units Featuring:

• compact design

• flexibility

• easy maintenance

• high quality and reliability

• quiet and efficient scroll compressor technology

FEATURES/BENEFITS

All in one package — high cooling efficiency, installation convenience, ease of accessibility for time-saving maintenance.

SPACE AND COST-SAVING DESIGN — Model 502A is specifically designed to provide the building owner with behind the scenes cooling, because it installs inside the ceiling. That’s why we call it the Bryant CeilingPAC unit. The compact design and low silhouette enable it to fit easily and securely above the conditioned space. Single package construction makes it easy to install with minimal time and cost.

APPLICATION FLEXIBILITY — If desired for particular applications, the unit can also be installed as a split system with the condenser section mounted horizontally. Centrifugal fans permit ducting of both evaporator and condenser air.

QUIET OPERATION — Commercial end users appreciate the extra comfort of quiet operation. Bryant engineers met the challenge by specifying heavy insulation, vibration-resistant construction and operating components that function at low noise levels, all of which keep system sound at a minimum level.

EASY MAINTENANCE — When it comes to maintenance, the

502A unit rates high in accessibility. Indoor location is ideal for the maintenance technician, and five access panels, easily removed, provide quick and convenient access to all components when needed. As an added plus, all required service/ maintenance access can be from one side allowing the unit to be located against a wall or ceiling plenum obstruction, an obvious space-saving idea.

BRYANT QUALITY AND RELIABILITY — The Bryant 502A

CeilingPAC units have much to offer the cost- and efficiencyconscious commercial owner. Every unit is thoroughly run tested at the factory and equipped with safety controls designed to monitor and protect over the life of the unit.

SCROLL COMPRESSOR TECHNOLOGY — Scroll compressors are designed for high efficiency and are internally spring mounted to minimize vibration noise. Each compressor is hermetically sealed against contamination to promote longer life and dependable operation. Scroll compressors are standard on all units.

Form No. PDS 502A.24.1

TABLE OF CONTENTS

Page

Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . 2

ARI Capacity Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Field-Installed Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-8

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9,10

Typical Wiring Schematics . . . . . . . . . . . . . . . . . . . . . . . . 10-13

Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15,16

Model Designation

502A Horizontal, Indoor

Single-Package Cooling Unit

MODEL NUMBER NOMENCLATURE

502A P X 048 000 AB

Indoor Fan Motor

AA — Standard Motor

AB — 1.5 hp Optional Motor*

Electric Heaters

000 — No factory-installed electric heaters

Nominal Tons

024 — 2

036 — 3

048 — 4

060 — 5

Voltage

J — 208/230-1-60

P — 208/230-3-60

E — 460-3-60

T — 575-3-60

X — Heat Not Installed

(field-installed electric heaters available)

*Factory-Installed option, contact your local representative for specific information.

ARI* CAPACITY RATINGS

UNIT

502A

024

V-PH-Hz

TOTAL kW

2.6

NET TOTAL

COOLING CAP. (Btuh)

25,000

036

048

060

208/230-1-60

208/230-1-60

208/230-3-60

460-3-60

208/230-1-60

208/230-3-60

460-3-60

575-3-60

208/230-1-60

208/230-3-60

460-3-60

575-3-60

4.3

5.5

6.9

36,000

49,500

58,500

LEGEND dB — Decibels

EER — Energy Efficiency Ratio

SEER — Seasonal Energy Efficiency Ratio

TDR — Time-Delay Relay

*Air-conditioning and Refrigeration Institute.

NOTES:

1. Ratings are at zero condenser air static and rated in accordance with ARI

Standard 210.

2. EER =

NET CAPACITY (Btuh)

TOTAL WATTS

NOMINAL

CFM

800

1200

1600

2000

EER

—

—

9.0

9.0

—

9.1

9.1

9.1

—

8.55

8.55

8.55

SEER

10.80

10.00

—

—

10.20

—

—

—

9.75

—

—

—

SEER

(with TDR)

11.00

10.05

—

—

10.40

—

—

—

10.05

—

—

—

SOUND RATING

(dB)

78

82

82

82

2

PHYSICAL DATA

UNIT 502A

SHIPPING WEIGHT (lb)*

OPERATING WEIGHT (lb)

Base Unit

REFRIGERANT TYPE

Operating Charge (lb)†

COMPRESSOR — TYPE

Quantity...Model

Oil (oz)

HPS Setting (psig)

Cutout

Reset

LPS Setting (psig)

Cutout

Reset

CONDENSATE DRAIN CONNECTION

Size (in.)...Type

CONDENSER FAN

Nominal Cfm

Maximum Rpm

Blower Size (in.)

Pulley Pitch Diameter (in.)

Blower

Motor (Variable)

Motor Hp

Motor Rpm

EVAPORATOR AIR FAN (Standard)

Nominal Cfm

Max Rpm

Blower Size (in.)

Motor Hp (Rpm)

EVAPORATOR AIR FAN (Optional)

Nominal Cfm

Max Rpm

Blower Size (in.)

Motor Hp

Motor Rpm

Pulley Pitch Diameter (in.)

Blower

Motor (Variable)

CONDENSER COIL

Size (L x H) (in.)

Number of Rows...Fins/in.

EVAPORATOR COIL

Size (L x H) (in.)

Number of Rows...Fins/in.

INDOOR-AIR FILTERS

Number...Size (in.)

INTERCONNECTING TUBING SIZE (in.)**

Hot Gas

Liquid

024

560

450

5.4

(1)...ZR23

24

Centrifugal — Direct Drive

LEGEND

HPS — High-Pressure Switch

LPS — Low-Pressure Switch

*Shipping weights include base unit plus packaging.

†If components are to be split, additional refrigerant will be needed.

**Use Type L copper only.

1

1350

None

None

1 /

2

825

800

1100

10 x 5

/

6

(850)

40 x 15

4...13.6

34 x 15

4...14.4

1 /

3 /

2

8

1100

12 x 6

Not

Available

1...14 x 34 x 1

036

590

480

5.5

(1)...ZR34

42

1350

R-22

Scroll

426 ± 7

320 ± 20

27 ± 4

67 ± 7

048

690

580

8.0

(1)...ZR49

48

3 /

4

...FPT

Centrifugal — Belt Drive

2250

1500

12 x 9

2450

5.0

2.4-3.4

3 /

4

1725

6.0

1.9-2.9

1

1725

Centrifugal — Direct Drive

1200

1150

1 /

10 x 6

2

(1075)

1600

1050

3 /

10 x 6

4

(1050)

Centrifugal Belt Drive

1600

1300

10 x 8

1 1 /

2

1725

6.0

2.4-3.4

1 1 /

2

1725

2000

2000

Copper Tubes — Aluminum Fins

40 x 16

4...17

Copper Tubes — Aluminum Fins

34 x 16

4...15

Factory-Supplied Cleanable Type

4.2

2.4-3.4

40 x 22

4...13.6

34 x 22

4...14.4

1...21 x 34 x 1

060

700

590

7.6

(1)...ZR57

54

1 /

2

3 /

8

1 /

2

3 /

8

1 /

2

3 /

8

NOTE: If components are to be split, the maximum length of refrigerant tubing to be used is 50 equivalent ft, assuming components will be installed in same horizontal plane.

If components are not to be installed in same horizontal plane, contact your Bryant representative for more information.

NOTE: Fasten threaded rods through holes in end frames. Use 2 rods on each side of unit for a total of 4.

All panels must be in place when rigging.

UNIT

502A

024

036

048

060

OPERATING WEIGHT DISTRIBUTION AND

CENTER OF GRAVITY

1

WEIGHT (lb/kg)

OF CORNER

2 3 4

93/42 108/49 139/63 120/54

95/43 113/51 148/67 124/56

112/51 143/65 183/83 142/64

114/52 143/65 186/84 147/67

2-5 /737

2-4

2-5 /737

2-4

3

3

A

DIMENSIONS

(ft-in./mm)

B

/

/

4

4

/730

/730

2-1

2-2 /660

2-3

5 /

8

/651

/686

2-2 3 /

4

/679

3

FIELD-INSTALLED ACCESSORIES

Thermostat and Subbase — Attractive wall-mounted 24-v accessory provides precise temperature control. Automatic and

Manual changeover models available. A thermostat subbase is available that works with Cycle-LOC™ circuitry. If a safety device trips, compressor locks out and subbase warning light

(LK OUT) alerts occupant.

Two models available: Two stage cool/two stage heat and one stage cool/one stage heat.

Time Guard® II Circuit (standard on single-phase units) —

Time Guard II device prevents short cycling of compressor if thermostat is rapidly changed; automatically prevents compressor from restarting for 5 minutes after shutdown.

Electric Heaters — A wide range of models available from 5 to

30 kW, 208-, 240- and 480-v, single- and 3-ph units. Mount easily on 502A discharge opening. Heater control box accessible from the bottom of heater.

Condensate Pump — The condensate pump is used when the distance and slope to the nearest drain is far enough to prevent the natural drainage of unit. The pump is mounted remotely from the unit and includes a signal light (field-installed) which illuminates when the reservoir rises beyond a certain level. The unit automatically shuts down when this reservoir level is achieved.

Head Pressure Control Damper — This accessory is duct mounted and allows unit to mechanically cool down to 0° F.

Damper dimensions fit 024, 036 sizes.

NOTE: For use with 048 and 060 size units, ductwork from unit to damper must be reduced in size to fit damper dimensions.

Vibration Isolators — Package of four isolators used for dampening any unit vibration so that vibrating sounds are not transmitted to building structure. Isolators are spring, ceiling type.

88EN ELECTRIC HEAT MODULE

ACCESSORY

HEAD PRESSURE CONTROL DAMPER (in.)

DIMENSIONS (in.)

UNIT

502A

A B C

024,036 13 1 /

2

16 2 1 /

2

048,060 24 21 3 /

4

3

D

8 1 /

2

DUCT

OPENING

7 1 /

8

x 14

19 7 1 /

8

x 20 7 /

8

4

BASE UNIT DIMENSIONS

UNIT

502A

024

036

048

060

DIMENSIONS (ft-in.)

A

2-5

2-4 3 /

4

2-5

2-4 3 /

4

B

2-1 5 /

8

2-2

2-3

2-2 3 /

4

C

1- 5 3 /

4

1- 5 3 /

4

1-11 5 /

8

1-11 5 /

8

D

1-2

1-2

1-8 7 /

8

1-8 7 /

8

E

1-1

1-1

1-7 7 /

8

1-7 7 /

8

Unit Component Locations

5

SELECTION PROCEDURE (with example)

I DETERMINE COOLING REQUIREMENTS AT DESIGN

CONDITIONS.

Given:

Gross Cooling Capacity

Required (TC) . . . . . . . . . . . . . . . . . . . . . . . . . 39,000 Btuh

Sensible Heat Capacity (SHC) . . . . . . . . . . . . 30,500 Btuh

Temperature of Air Entering Condenser . . . . . . . . . . . 95 F

Temperature of Air Entering

Evaporator. . . . . . . . . . . . . . . . . . . . . 80 F edb/67 F ewb

Evaporator Air Quantity . . . . . . . . . . . . . . . . . . . 1,200 cfm

External Static Pressure:

Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . 0.50 in. wg

Evaporator (includes static pressure drop of factory-supplied filter of 0.06 in. wg) . . . . . . . . . . . . . . . . . . . . . . 0.20 in. wg

II SELECT UNIT BASED UPON REQUIRED COOLING

CAPACITY.

Enter cooling capacity table at temperature of air entering condenser of 95 F. The 502A036 unit at 1200 cfm and

67 F ewb will provide a Total Capacity (TC) of 44,200 Btuh and a Sensible Heat Capacity (SHC) of 31,300 Btuh.

Since the entering air is 80 F edb, an SHC correction is not required.

III DETERMINE EVAPORATOR FAN PERFORMANCE.

Enter Evaporator Fan Performance table at 1200 cfm and 502A036 data. The external static pressure shown

(0.23 in. wg) will exceed the 0.20 in. wg required. The fan motor will require 0.52 kW.

IV DETERMINE CONDENSER FAN PERFORMANCE AND

MOTOR PULLEY SETTING REQUIREMENTS.

Enter Condenser Fan Performance table at the selected cfm and required static pressure of 0.50 in. wg. The fan motor will require 0.73 kW and the motor pulley should be set at 2 turns open at 1350 cfm of condenser air required.

NOTE: Unit 502A024 contains a direct-drive condenser fan assembly.

PERFORMANCE DATA

GROSS COOLING CAPACITIES

502A024

Temp

Air Ent

Condenser

(F)

85

Evaporator Air Quantity — Cfm/BF

600/0.02

800/0.03

1000/0.04

Evaporator Air Ewb Temp (F)

72 67 62 72 67 62 72 67 62

TC 27.1 25.3 23.0 27.7 26.4 24.6 27.8 26.9 25.8

SHC 13.5 17.0 20.2 14.7 19.4 23.7 15.6 21.5 25.8

kW 1.64 1.62 1.61 1.65 1.63 1.62 1.65 1.64 1.63

95

105

115

TC 26.6 24.5 20.8 27.4 25.8 22.9 28.0 26.5 25.2

SHC 13.4 16.7 19.1 14.7 19.4 22.8 16.0 21.7 25.2

kW 1.85 1.84 1.80 1.86 1.85 1.82 1.87 1.85 1.84

TC 25.8 22.3 18.4 27.1 24.5 21.2 27.7 25.6 23.6

SHC 13.1 15.8 17.9 14.7 18.9 21.2 16.2 21.5 23.6

kW 2.09 2.05 1.99 2.11 2.08 2.04 2.12 2.10 2.07

TC 24.6 19.9 16.5 26.1 22.0 19.8 26.8 23.6 22.3

SHC 12.7 14.8 16.5 14.4 17.9 19.8 16.0 20.7 22.3

kW 2.36 2.29 2.22 2.39 2.33 2.29 2.39 2.35 2.33

See Legend on page 7.

502A036

Temp

Air Ent

Condenser

(F)

85

Evaporator Air Quantity — Cfm/BF

900/0.01

1050/0.01

1200/0.02

Evaporator Air Ewb Temp (F)

72 67 62 72 67 62 72 67 62

TC 45.0 41.1 37.3 45.8 42.3 38.6 46.5 43.4 39.8

SHC 22.5 27.7 32.6 23.6 29.9 35.6 24.6 32.0 38.3

kW 3.19 3.07 2.96 3.22 3.11 3.00 3.25 3.14 3.04

95

105

115

TC 43.0 38.8 34.3 44.1 40.1 35.8 45.0 44.2 37.4

SHC 21.8 26.8 31.1 23.1 29.1 34.1 24.4 31.3 36.8

kW 3.42 3.28 3.15 3.46 3.33 3.20 3.49 3.37 3.25

TC 40.4 35.8 29.6 41.6 37.1 31.3 42.6 38.2 33.2

SHC 20.9 25.6 28.5 22.3 27.9 30.8 23.7 30.2 33.2

kW 3.63 3.48 3.38 3.68 3.53 3.44 3.73 3.58 3.49

TC 37.7 30.6 25.8 38.7 31.6 37.8 39.7 32.8 29.7

SHC 19.9 23.3 25.8 21.3 25.5 27.8 22.7 27.8 29.7

kW 3.85 3.71 3.59 3.90 3.76 3.67 3.94 3.80 3.73

6

PERFORMANCE DATA (cont)

GROSS COOLING CAPACITIES (cont)

502A048

Temp

Air Ent

Condenser

85

95

105

115

(F)

Evaporator Air Quantity Cfm/BF

1200/0.06

1600/0.08

Evaporator Air Ewb Temp (F)

2000/0.10

72 67 62 57 72 67 62 57 72 67 62 57

TC 56.0 52.1 47.9 44.4 57.7 54.5 50.6 49.6 59.4 56.0 52.7 52.3

SHC 27.8 34.8 41.6 44.4 30.2 39.6 48.0 49.6 32.8 43.9 52.5 52.3

kW 3.77 3.68 3.59 3.53 3.81 3.74 3.66 3.64 3.85 3.77 3.70 3.69

TC 54.0 50.1 45.7 42.4 55.7 52.3 48.6 47.3 57.4 53.8 51.0 50.9

SHC 27.1 34.0 40.4 42.4 29.6 38.8 47.0 47.3 32.4 43.2 50.9 50.9

kW 4.21 4.11 4.01 3.95 4.25 4.18 4.09 4.07 4.31 4.21 4.15 4.15

TC 51.8 47.9 42.3 40.2 53.6 50.0 45.1 45.0 54.6 51.4 48.9 48.6

SHC 26.3 33.1 38.8 40.2 29.0 38.0 44.8 45.0 31.3 42.4 48.9 48.6

kW 4.69 4.58 4.45 4.40 4.75 4.65 4.54 4.53 4.77 4.69 4.63 4.63

TC 49.5 45.5 38.6 37.7 51.2 47.6 41.9 42.1 52.2 49.1 45.8 45.8

SHC 25.5 32.2 37.0 37.7 28.3 27.3 41.8 42.1 30.7 42.0 45.8 45.8

kW 5.21 5.09 4.92 4.89 5.27 5.17 5.03 5.03 5.30 5.23 5.14 5.14

LEGEND

BF — Bypass Factor

Ewb — Entering Wet-Bulb kW — Compressor Motor Power Input (kilowatts)

SHC — Gross Sensible Heat Capacity (1000 Btuh)

TC — Gross Total Cooling Capacity (1000 Btuh)

NOTES:

1. Performance based on nominal condenser airflow listed in physical data table on page 3.

2. SHC is based on 80 F db temperature of air entering the coil.

Below 80 F db, subtract (corr factor x cfm) from SHC.

Above 80 F db, add (corr factor x cfm) to SHC.

502A060

Temp

Air Ent

Condenser

85

95

105

115

(F)

Evaporator Air Quantity — Cfm/BF

72

1500/0.06

67

2000/0.09

Evaporator Air Ewb Temp (F)

62 72 67 62 72

2250/0.10

67 62

TC 64.8

58.5

52.9

68.0

61.5

56.3

68.9

62.5

58.0

SHC 33.2

41.1

48.5

37.2

47.3

55.7

38.9

50.0

57.7

kW 4.49

4.29

4.13

4.59

4.83

4.22

4.62

4.41

4.27

TC 61.9

55.7

50.2

65.1

58.7

54.0

66.1

59.7

55.8

SHC 32.3

40.1

47.3

36.4

46.5

54.0

38.2

49.3

55.8

kW 4.94

4.72

4.57

5.04

4.81

4.67

5.07

4.84

4.72

TC 58.5

52.4

47.2

61.5

55.2

51.4

62.6

56.3

53.3

SHC 31.1

38.8

45.8

35.2

45.2

51.4

37.1

48.1

58.2

kW 5.41

5.20

5.04

5.51

5.28

5.16

5.55

5.32

5.22

TC 54.9

49.0

44.1

57.8

51.7

48.7

58.7

52.6

50.4

SHC 29.8

37.5

44.0

34.0

43.9

48.7

35.9

46.7

50.4

kW 5.93

5.72

5.56

6.04

5.80

5.70

6.07

5.83

5.75

The following formulas may be used: t ldb

= t edb

– sensible capacity (Btuh)

1.10 x cfm tlwb = Wet-bulb temperature corresponding to enthalpy of air leaving evaporator col (hlwb).

h lwb

= h ewb

– total capacity (Btuh)

4.5 x cfm

Where: hewb = Enthalpy of air entering evaporator coil

BYPASS

FACTOR

(BF)

.025

.05

.10

.20

.30

.35

79

ENTERING AIR DRY-BULB TEMPERATURE (F)

78 77 76 75 Under 75

81 82 Over 85

1.07

1.04

.98

.87

.76

.71

2.12

2.07

1.96

1.74

1.53

1.42

83 84 85

Correction Factor

3.19

3.11

2.94

2.62

2.29

2.13

4.25

4.14

3.92

3.49

3.05

2.83

5.32

5.18

4.90

4.36

3.82

3.54

Use formula shown below

Correction Factor = 1.10 x (1 – BF) x db – 80)

EVAPORATOR FAN PERFORMANCE

CFM

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

ESP

.60

.54

.43

.29

.11

—

—

—

—

—

—

—

—

—

—

024

Fan kW

.20

.22

.24

.26

.29

—

—

—

—

—

—

—

—

—

—

ESP

—

—

—

.69

.57

.42

.23

—

—

—

—

—

—

—

—

036

LEGEND

ESP — External Static Pressure (in. wg) kW — Total Fan Motor Power Input (kilowatts)

*Standard direct drive indoor (evaporator) fan motor (IFM). For optional belt drive IFM performance, see table on page 8.

NOTES:

1. Above fan performance is based on wet coil and deducted casing losses, and clean factory-installed permanent cleanable filter.

UNIT SIZE — 502A

Fan kW

—

—

—

.44

.46

.49

.52

—

—

—

—

—

—

—

—

048* 060*

ESP

—

—

—

—

—

1.10

1.01

.90

.79

.67

.54

.39

.22

.03

—

Fan kW

—

—

—

—

—

.45

.49

.51

.55

.58

.61

.64

.67

.70

—

ESP

—

—

—

—

—

1.11

1.045

.97

.88

.78

.67

.53

.52

.40

.28

Fan kW

—

—

—

—

—

.52

.55

.57

.59

.62

.64

.67

.70

.74

.78

2. Evaporator fans are direct drive (except 048, 060 special order evaporator-fan motor option). Refer to Belt Drive Evaporator Fan

Performance table on page 8.

3. Interpolation is permissible, do not extrapolate.

4. For units installed with accessory electric heaters, see Electric

Heater Static Pressure Drop table for additional performance losses.

7

PERFORMANCE DATA (cont)

BELT DRIVE EVAPORATOR FAN PERFORMANCE

(Special Order Only, Pricing and ordering on related price pages.)

CFM

1800

1850

1900

1950

2000

2050

2100

2150

2200

2250

ESP

—

—

—

.81

.72

.63

.55

.47

.42

.34

UNIT SIZE — 502A

048

Fan kW

—

—

—

1.03

1.05

1.07

1.08

1.11

1.14

1.17

ESP

—

—

—

—

—

—

1.02

.93

.84

.75

060

Fan kW

—

—

—

—

—

—

1.17

1.21

1.24

1.27

LEGEND

ESP — External Static Pressure (in. wg) kW — Total Fan Power Motor Input (kilowatts)

NOTE: Pulley setting must be adjusted to limit cfm to 450 cfm/ton

maximum. Unit operation beyond that limit may result in blow-off and condensate problems.

CONDENSER FAN PERFORMANCE

EXTERNAL STATIC PRESSURE (in. wg)

0.2

0.3

0.4

—

—

.80

—

—

.68

—

.57

—

—

—

.83

—

.74

—

—

—

—

1.24

—

—

—

1.01

—

—

—

.90

kW

—

—

.63

—

—

Turns

—

—

Note 4

—

—

—

3

—

4

—

—

2

—

—

—

—

2

—

3

—

—

—

—

4

—

—

—

5

—

—

—

3

Turns

—

—

—

Note 4

—

—

—

3

—

—

—

—

2

—

—

—

1

2

—

—

—

—

2

—

—

3

—

—

—

—

4

—

—

—

—

.78

—

—

.67

—

—

—

—

.89

.80

—

—

—

—

1.39

—

—

1.17

—

—

—

—

.97

— kW

—

—

—

.62

—

Turns

—

—

—

—

Note 4

2

—

—

3

—

—

—

1

—

—

—

—

1

—

2

2

—

—

—

3

—

—

—

—

—

—

—

—

—

—

.84

.76

—

—

.65

—

—

—

—

.86

—

.77

—

—

—

—

1.32

—

—

—

1.12

—

—

— kW

—

—

—

—

.62

Turns

1

—

2

—

—

—

—

—

—

—

—

—

—

0

1

—

—

—

2

—

—

—

3

—

—

—

—

—

—

—

—

—

0.5

kW

—

—

—

—

—

—

—

—

—

—

—

—

—

.83

—

.73

—

—

—

—

—

—

.90

.82

—

—

—

1.26

—

—

—

1.08

5. Minimum one turn open of motor pulley is required on unit sizes 036 and 060.

6. Number of turns open applies to field setting of motor pulley.

7. Factory setting as follows: 036, 4 turns open; 048, 2 turns open; 060,

5 turns open.

—

1

—

2

—

—

—

—

—

—

—

—

—

—

0

—

—

1

—

—

—

2

—

—

—

—

—

Turns

—

—

—

—

—

0.6

—

—

—

—

—

.81

—

.71

—

—

—

—

—

—

.86

—

—

—

—

—

—

1.37

—

—

—

1.21

— kW

—

—

—

—

—

8

OPERATING SEQUENCE

Cooling

1. Thermostat calls for cooling.

a. Indoor (evaporator) fan relay is energized and starts evaporator fan.

b. Compressor contactor is energized to start compressor and condenser fan (up to a 5-minute delay on singlephase units).

CONTROLS

2. When room thermostat is satisfied, the evaporator fan, compressor, and condenser fan shut off.

Continuous Fan Operation — The thermostat can be set for continuous operation by setting the fan switch to ON.

UNIT

502A

024

036

048

048*

060

060*

V-PH

(60 Hz)

230-1

230-1

208/230-3

460-3

230-1

208/230-3

460-3

575-3

208/230-3

460-3

230-1

208/230-3

460-3

575-3

208/230-3

460-3

VOLTAGE RANGE

Min

207

207

187

414

207

187

414

518

187

414

207

187

414

518

187

414

Max

254

254

254

508

254

254

508

632

254

508

254

254

508

632

254

508

COMPRESSOR

RLA

11.5

17.2

10.2

4.3

23.7

13.5

7.4

5.8

13.5

7.4

28.8

17.3

9.0

7.1

17.3

9.0

LEGEND

HACR — Heating, Air Conditioning, and Refrigeration

Hp — Horsepower

FLA — Full Load Amps

LRA — Locked Rotor Amps

MOCP — Maximum Overcurrent Protection (HACR breaker)

RLA — Rated Load Amps

LRA

62.5

96.0

77.0

37.0

129.0

99.0

49.5

40.0

99.0

49.5

169.0

123.0

62.0

50.0

123.0

62.0

ELECTRICAL DATA

.50

.50

.50

.75

.75

.75

.75

1.5

1.5

.75

.75

.75

.75

1.5

1.5

FAN MOTORS

Evaporator

Hp FLA

.17

1.10

Condenser

Hp

.50

FLA

3.40

3.20

3.20

1.50

4.00

4.00

2.15

1.40

5.60

2.80

4.00

4.00

2.15

1.40

5.60

2.80

.75

.75

.75

1.0

1.0

1.0

1.0

1.0

1.0

1.5

1.5

1.5

1.5

1.5

1.5

6.06

3.93

1.97

8.35

3.93

1.97

1.45

3.93

1.97

9.50

4.82

2.41

1.90

4.82

2.41

*Optional evaporator-fan motor nameplate data.

POWER SUPPLY

Min Ckt

Amps

19.1

29.5

19.9

8.8

42.0

24.8

13.4

10.1

26.4

14.0

49.5

30.4

15.8

12.2

32.0

16.5

MOCP

Amps

70

45

25

20

40

25

60

35

15

15

35

20

25

40

25

15

ELECTRIC HEATER

UNIT 88EN

0050CA01

0075CA01

0115CA01

0075EA01

1150EA01

0100EA01

0150EA01

0200EA01

0300EA01

USED WITH

UNIT 502A

024, 036

1-Stage Heat

048, 060

2-Stage Heat

0300CA01

0100FA01

0150FA01

0200FA01

0300FA01

LEGEND

MCA — Minimum Circuit Ampacity

MOCP — Maximum Overcurrent Circuit Protection

(Fuses or Circuit Breaker)

V-PH

(60 Hz)

240-1

240-1

240-1

208-3

240-3

208-3

240-3

208-3

240-1*

240-3

208-3

240-1*

240-3

208-3

240-1*

240-3

208-3

240-3

240-1

480-3

480-3

480-3

480-3

ELECTRIC HEATER DATA

CAP. (kW)

5.0

7.5

11.5

5.6

7.6

11.3

15.0

7.5

10.0

10.0

11.3

15.0

15.0

15.0

20.0

20.0

22.5

30.0

30.0

10.0

15.0

20.0

30.0

Heater Amps

20.8

31.3

47.9

15.6

18.0

31.2

36.1

20.8

41.7

24.1

31.2

62.5

36.1

41.7

83.3

46.9

62.5

72.2

124.0

12.0

18.1

24.1

36.1

BRANCH CIRCUIT

MCA

26.0

39.1

59.9

19.5

22.6

39.0

45.1

26.0

52.1

30.1

39.0

78.1

45.1

52.1

104.2

58.6

78.2

90.2

155.0

15.0

22.6

30.1

45.1

MOCP (Amps)

30

40

60

20

25

40

50

30

60

35

40

80

50

60

110

60

80

100

175

15

25

35

50

*May be field converted to single-phase units, see electric heat installation instructions.

NOTE: Separate power source is required for all heaters. Control from base unit 502A (24 v).

9

ELECTRICAL DATA (cont)

ELECTRIC HEATER STATIC PRESSURE DROP (in. wg)

ELECTRIC HEATER

UNIT 88EN

0050CA01

0075CA01

0115CA01

0075EA01

1150EA01

0100EA01

0150EA01

0200EA01

0300EA01

0300CA01

0100FA01

0150FA01

0200FA01

0300FA01

UNIT

502A

024, 036

1-stage heat

048, 060

2-stage heat

MIN

CFM

400

510

620

320

720

970

1240

1350

1220

1220

1130

1360

1350

1270

600

.02

.03

.04

—

—

—

—

800

.04

.06

.08

—

—

—

—

1000

.06

.10

.13

—

—

—

—

1200

.10

.16

.19

.04

.08

.04

.08

UNIT CFM

1400

—

—

—

.06

.11

.06

.11

1600

—

—

—

.08

.14

.08

.14

1800

—

—

.12

.18

.12

.18

NOTE: Above electric heaters are not UL or CSA listed for use with optional high-static evaporator-fan motor (048, 060 units only).

—

TYPICAL WIRING SCHEMATICS

2000

—

—

—

.15

.22

.15

.22

2200

—

—

—

.17

.26

.17

.26

NOTES:

1. Compressor and fan motors are thermally protected 3-phase motors protected against primary single-phase condition.

2. If any original wires furnished must be replaced, it should be replaced with 90 C or its equivalent.

3. Numbers indicate the line location of used contacts. A bracket over 2 numbers signifies a single-pole double-throw contact. An underlined number signifies a normally closed contact.

4. Must use thermostat HH07AT170, 172 or 174 with subbase HN63AZ176, 177 or 178.

5. Separate field power supply required for electric heater accessory.

6. CLO locks out the compressor to prevent short cycling on compressor overloads and safety devices. Before replacing CLO check devices.

AHA

C

CB

CC

CLO

CT

— Adjustable Heat Anticipator

BKR W/AT — Brakes with Amp Turns

— Contactor Compressor

— Circuit Breaker

— Cooling Compensator

— Compressor Lockout

— Current Transformer

EQUIP GND — Equipment Ground

HPS — High-Pressure Switch

HR

IFC

IFR

JB

L

LOR

— Heater Relay

— Indoor (Evaporator) Fan Contactor

— Indoor (Evaporator) Fan Relay

— Junction Box

— Light

— Lockout Relay

LEGEND

LPS

NEC

PL

TB

TC

TH

— Low-Pressure Switch

— National Electrical Code

— Plug Assembly

— Terminal Block

— Thermostat-Cooling

— Thermostat-Heating

TRAN — Transformer

Marked Wire

Denotes connection point between subbase and thermostat

Terminal (Marked)

Terminal (Unmarked)

502A036,048,060, 208/230-3-60, 460-3-60; and 502A036, 208/230-1-60

Terminal Block

Field Splice

Splice (Marked)

Factory Splice

Factory Wiring

Accessory or Optional Wiring

Field Control Wiring

Field Power Wiring

To indicate common potential only, not to represent wiring

10

TYPICAL WIRING SCHEMATICS (cont)

LEGEND

L

LPS

NS

OAT

OFC

OFM

PL

QT

RC

SW

TB

TC

FU

GND

HPS

HR

IFC

IFM

IFR

JB

AHA

C

CAP

CB

— Adjustable Heat Anticipator

— Contactor Compressor

— Capacitor

— Circuit Breaker

CC

CDT

— Cooling Compensator

— Compressor Discharge Thermostat

COMP — Compressor Motor

EQUIP — Equipment

—

—

—

—

—

—

—

—

Fuse

Ground

High-Pressure Switch

Heater Relay

Indoor-Fan Contactor

Indoor-Fan Motor

Indoor-Fan Relay

Junction Box

—

—

—

—

—

—

—

—

—

—

—

—

Light

Low-Pressure Switch

Night Setback Switch

Outdoor-Air Thermostat

Outdoor-Fan Contactor

Outdoor-Fan Motor

Plug Assembly

Quadruple Terminal

Run Capacitor

Switch

Terminal Block

Thermostat-Cooling

TH

TRAN

— Thermostat-Heating

— Transformer

Marked Wire

Denotes connection point between subbase and thermostat

Terminal (Marked)

Terminal (Unmarked)

Terminal Block

Field Splice

Splice (Marked)

Factory Splice

Factory Wiring

Accessory or Optional Wiring

Field Control Wiring

Field Power Wiring

To indicate common potential only, not to represent wiring

502A024, 230-1-60 Units

11

NOTES:

1. Neutral for 240/416 v supply (Canada only).

2. If any original wires furnished must be replaced, it should be replaced with 90 C or its equivalent.

3. Numbers indicate the line location of used contacts. A bracket over 2 numbers signifies a single-pole double-throw contact. An underlined number signifies a normally closed contact. Plain (no line) number signifies a normally open contact.

4. Must use thermostat HH07AT170, 172 or 174 with subbase

HN63AZ176, 177 or 179.

5. Separate field power supply required for electric heater accessory.

TYPICAL WIRING SCHEMATICS (cont)

LEGEND

AHA

C

CAP

CB

— Adjustable Heat Anticipator

— Contactor Compressor

— Capacitor

— Circuit Breaker

CC

CDT

— Cooling Compensator

— Compressor Discharge Thermostat

CH — Crankcase Heater

COMP — Compressor Motor

EQUIP — Equipment

GND — Ground

HPS

HR

—

—

High-Pressure Switch

Heater Relay

IFC

IFM

IFR

JB

—

—

—

—

Indoor-Fan Contactor

Indoor-Fan Motor

Indoor-Fan Relay

Junction Box

L

LPS

NEC

OFM

PL

QT

RC

TB

—

—

—

—

—

—

—

—

Light

Low-Pressure Switch

National Electrical Code

Outdoor-Fan Motor

Plug Assembly

Quadruple Terminal

Run Capacitor

Terminal Block

TC

TH

—

—

Thermostat-Cooling

Thermostat-Heating

TRAN — Transformer

Marked Wire

Denotes connection point between subbase and thermostat

Terminal (Marked)

Terminal (Unmarked)

Terminal Block

Field Splice

Splice (Marked)

Factory Splice

Factory Wiring

Accessory or Optional Wiring

Field Control Wiring

Field Power Wiring

To indicate common potential only, not to represent wiring

502A048,060, 230-1-60 Units

12

NOTES:

2. If any original wires furnished must be replaced, it should be replaced with 90 C or its equivalent.

3. Numbers indicate the line location of used contacts. A bracket over 2 numbers signifies a single-pole double-throw contact. An underlined number signifies a normally closed contact. Plain (no line) number signifies a normally open contact.

4. Must use thermostat HH07AT170, 172 or 174 with subbase

HN63AZ176, 177 or 179.

5. Neutral for 240/416 v supply (Canada only).

6. Separate field power supply required for electric heater accessory.

7. The 10-kW, 15-kW and 20-kW heater assemblies for

502A048,060 are wired for 3 phase. See heater label diagram for

1-phase rewiring procedure.

TYPICAL WIRING SCHEMATICS (cont)

GND

HPS

IFC

IFM

IFR

JB

L

LOR

AHA — Adjustable Heat Anticipator

BKR W/AT — Breaks with Amp Turns

C

CC

—

—

Contactor Compressor

Cooling Compensator

CLO

COMP

CT

EQUIP

—

—

—

—

Compressor Lockout

Compressor Motor

Current Transformer

Equipment

—

—

—

—

—

—

—

—

Ground

High-Pressure Switch

Indoor-Fan Contactor

Indoor-Fan Motor

Indoor-Fan Relay

Junction Box

Light

Lockout Relay

LPS

NEC

OFM

PL

PRI

TB

TC

TH

TRAN

— Low-Pressure Switch

— National Electrical Code

— Outdoor-Fan Motor

— Plug Assembly

— Primary

— Terminal Block

— Thermostat-Cooling

— Thermostat-Heating

— Transformer

Marked Wire

LEGEND

Denotes connection point between subbase and thermostat

Terminal (Marked)

Terminal (Unmarked)

Terminal Block

Field Splice

Splice (Marked)

Factory Splice

Factory Wiring

Accessory or Optional Wiring

Field Control Wiring

Field Power Wiring

To indicate common potential only, not to represent wiring

502A048,060, 575-3-60 Units

13

NOTES:

1. Compressor and fan motors are thermally protected, three-phase motors protected against primary single-phase conditions.

2. If any original wires furnished must be replaced, it should be replaced with 90 C or its equivalent.

3. Numbers indicate the line location of used contacts. A bracket over 2 numbers signifies a single-pole double-throw contact. An underlined number signifies a normally closed contact. Plain (no line) number signifies a normally open contact.

4. Must use thermostat HH07AT170, 172 or 174 with subbase

HN63AZ176, 177 or 179.

5. Neutral for 240/416 v supply (Canada only).

6. The CLO locks out the compressor to prevent short cycling on compressor overloads and safety devices, before replacing CLO check these devices.

TYPICAL PIPING AND WIRING

LEGEND

NEC — National Electrical Code

NOTES:

1. Wiring and piping shown are not intended for or to include all details for specific installation.

2. All wiring must comply with applicable local and national codes.

3. All piping must follow standard refrigerant piping techniques.

4. For other installation details refer to Installation Instructions.

5. If unit sections are field split, 8 threaded support rods are required.

6. Ensure condenser air recirculation is minimized.

APPLICATION DATA

OUTDOOR-AIR TEMPERATURE OPERATING LIMITS (F)

UNIT 502A

Without Head Pressure Control Minimum

Maximum

With Head Pressure Control Minimum

Maximum

Field Splitting Instructions — If components are split, maximum length of refrigerant tubing to be used is 50 ft, assuming components are installed in same horizontal plane. Condenser may be mounted up to 12-ft above evaporator. Liquid line tubing is 3 /

8

-in. OD copper tubing, and discharge line is 1 /

2

-in. OD copper tubing. Units should always be within line of sight from each other, or separate NEC (National Electrical Code)

024

35

126

0

126

036

35

126

0

126

048

40

126

0

126

060

40

126

0

126 disconnects will be required. Junction boxes should be installed in both the evaporator and condenser sections adjacent to

D-shaped grommets, to provide a location to splice the outdoorfan motor factory wiring (no. 16 AWG [American Wire Gage],

4 /

64

-in. thick insulation). Field wiring should be a minimum of no. 16 AWG, 4 /

64

-in. thick insulation. Check all applicable electrical codes to ensure proper compliance.

14

GUIDE SPECIFICATIONS

INDOOR PACKAGED UNIT

HVAC GUIDE SPECIFICATIONS — SECTION 15787

SIZE RANGE: 2 TO 5 TONS, NOMINAL

BRYANT MODEL NUMBER: 502A

PART 1 — GENERAL

1.01 SYSTEM DESCRIPTION

Indoor mounted, electrically controlled packaged horizontal cooling unit utilizing a hermetic type scroll compressor.

1.02 QUALITY ASSURANCE

A. Unit shall be certified in accordance with ARI Standard 210.

B. Unit shall be UL listed and carry a UL label.

C. Unit shall be CSA approved (except 3 ton, 3-phase units).

D. Unit shall be factory run-tested to ensure proper performance prior to delivery.

1.03 DELIVERY, STORAGE, AND HANDLING

A. Unit shall be shipped completely assembled and ready to operate.

B. Unit shall be shipped factory charged with refrigerant

R-22.

C. Unit shall be stored and handled in accordance with the unit manufacturer’s instructions.

PART 2 — PRODUCTS

2.01 EQUIPMENT

A. General:

Factory assembled horizontal, single piece, air cooled, indoor, ceiling plenum mounted electric cooling unit. Contained within the unit enclosure shall be all factory wiring, piping, controls, refrigerant charge (R-22), and special features required prior to start-up.

B. Unit Cabinet:

1. Constructed of galvanized steel.

2. Interior shall be insulated with 1 /

2

-in. thick neoprene coated fiberglass. Insulation shall be bonded to interior surfaces by sprayed water reduceable adhesive.

3. Equipped with 3 same side access panels and 2 bottom hanging removable doors to facilitate ease of maintenance. Side panels allow access to the control box, refrigeration components, and condenser coil.

Control box shall be hinged allowing access to the compressor and pressure switches. Bottom doors shall allow access to and easy removal of the condenser and evaporator motors and blower assemblies.

4. Equipped with two 3 /

4

-in. threaded condensate drain connections below the evaporator coil and one 3 /

4

-in.

threaded connection for condenser coil wash down.

Connections shall be factory plugged for field removal.

5. Field splittable through the removal of 4 bolts and extending refrigerant piping and wiring to allow remote horizontal or vertical condenser mounting.

6. Unit shall have an integral hanging bracket requiring only 4 threaded rods (8 if unit is split) run to the top flange of the unit for hanging, eliminating need for external hanger brackets.

7. Contains junction box for power connection and opening for routing of control wiring.

C. Fans:

1. Evaporator: a. Blower shall be of the forward-curved, centrifugal, direct-drive type or belt drive (4 and 5 tons only).

bearings.

c. Unit sizes 048, 060 shall be available with an optional 1.5 hp fan motor.

2. Condenser: a. Blower shall be of the forward-curved, centrifugal, direct-driven type (024 only), or belt drive

(036,048,060).

* bearings.

D. Compressor:

1. Fully hermetic scroll type.

2. Mounted on suitable spring vibration isolators.

3. Equipped with internal line break protection.

E. Coils:

Evaporator and condenser coils shall be of non-ferrous construction with aluminum fins mechanically bonded to seamless copper tubes with all joints brazed.

F. Refrigerant Components:

Refrigerant components shall include:

1. Capillary tube feed system.

2. Refrigerant filter-drier.

G. Filter Section:

Filter section shall consist of factory-installed, permanent, cleanable air filter, removable from the same side as the access panels without the use of tools.

H. Controls and Safeties:

Control system shall include a high-pressure switch, a low-pressure switch, and a compressor lockout feature which upon tripping of any safety device shall prevent compressor from restarting until reset at the thermostat

(on all 3-phase units and 036 single-phase units only).

I. Operating characteristics:

1. Unit shall operate using refrigerant R-22.

2. Unit shall be designed for indoor suspended horizontal mounting and operation.

J. Electrical Requirements

Unit shall have single point power connection to leads in terminal box.

K. Special Features:

Certain standard features are not applicable when the features designated by * are specified. For assistance in amending the specifications, your local Bryant Sales

Office should be contacted.

1. Electric Heat Module: a. Provides encased heater elements that shall attach directly to the base unit discharge.

b. Shall have bottom access.

c. UL listed.

2. Thermostat Assembly:

Provides cooling and fan control. Standard subbase shall include ‘‘Compressor malfunction light’’ designed to illuminate if compressor lockout is activated.

15

*

*

GUIDE SPECIFICATIONS (cont)

3. Compressor Cycle Delay:

Prevents compressor from restarting for a minimum of 5 minutes after shutdown.

4. Condensate Pump:

Unit shall be equipped with remotely located condensate pump. A field-installed light shall illuminate when reservoir rises above a preset level. Unit shall shut down upon reservoir light illumination.

5. Head Pressure Control Package:

Allows unit to mechanically cool down to 0° F ambient temperature. Package shall include damper operating device and all necessary hardware.

6. Vibration Isolation Package:

Shall provide 4 spring hangers for ceiling mounted unit to damper vibration that may be transmitted to building structure.

7. Time Guard® II Device:

Time Guard II device (024,048,060 single-phase only) shall prevent the compressor from restarting for a minimum of 5 minutes after shutdown.

Copyright 2001 Bryant Heating & Cooling Systems

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

UNIT MUST BE INSTALLED IN ACCORDANCE

WITH INSTALLATION INSTRUCTIONS

Printed in U.S.A.

1-01 Catalog No. 5250-200