Bryant 502A User Manual

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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 —

cifically 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 Ceiling 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 —

cations, 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 —

extra comfort of quiet operation. Bryant engineers met the

Commercial end users appreciate the

PA C

If desired for par ticular appli-

Model 502A is spe-

unit. The compact design

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 —

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 —

Ceiling conscious 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 —

sors 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.

units have much to offer the cost- and efficiency-

PA C

When it comes to maintenance, the

The Bryant 502A

Scroll compres-

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 NUMBER NOMENCLATURE

502A P X 048 000 AB

Model Designation 502A Horizontal, Indoor Single-Package Cooling Unit

Voltage J — 208/230-1-60 P — 208/230-3-60 E — 460-3-60 T — 575-3-60

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

ARI* CAPACITY RATINGS

UNIT 502A

024

036

048

060

dB — EER — SEER — TDR —

*Air-conditioning and Refrigeration Institute.

NOTES:

1. Ratings are at zero condenser air static and rated in accordance with ARI Standard 210.

2. EER =

V-P H- Hz

208/230-1-60 2.6 25,000 800 — 10.80 11.00 78 208/230-1-60

460-3-60 9.0 — —

208/230-1-60 208/230-3-60 9.1 — —

460-3-60 9.1 — — 575-3-60 9.1 — —

208/230-1-60 208/230-3-60 8.55 — —

460-3-60 8.55 — — 575-3-60 8.55 — —

LEGEND

Decibels Energy Efficiency Ratio Seasonal Energy Efficiency Ratio Time-Delay Relay

NET CAPACITY (Btuh)

TOTAL WATTS

TOTAL

4.3 36,000 1200

5.5 49,500 1600

6.9 58,500 2000

NET TOTAL

COOLING CAP. (Btuh)

NOMINAL

CFM

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

X — Heat Not Installed

(field-installed electric heaters available)

EER SEER

—10.00 10.05

—10.20 10.40

—9.7510.05

SEER

(with TDR)

SOUND RATING

(dB)

82208/230-3-60 9.0 — —

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)

Centrifugal — Direct Drive Centrifugal — Belt Drive

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

HPS — LPS —

*Shipping weights include base unit plus packaging. †If components are to be split, additional refrigerant will be needed. **Use Type L copper only.

LEGEND

High-Pressure Switch Low-Pressure Switch

PHYSICAL DATA

024 036 048 060

560 590 690 700

450 480 580 590

5.4 5.5 8.0 7.6

(1)...ZR23 (1)...ZR34 (1)...ZR49 (1)...ZR57

24 42 48 54

1350 1350 2250 2450

None 5.0 6.0 6.0 None 2.4-3.4 1.9-2.9 2.4-3.4

825 1725 1725 1725

800 1200 1600 2000

1100 1150 1050

10 x 5 10 x 6 10 x 6

/6 (850)

40 x 15 40 x 16 40 x 22

4...13.6 4...17 4...13.6

34 x 15 34 x 16 34 x 22

4...14.4 4...15 4...14.4

1100 1500

12 x 6 12 x 9

Centrifugal — Direct Drive

/2 (1075)

Not

Available

Copper Tubes — Aluminum Fins

1...14 x 34 x 1 1...21 x 34 x 1

Factory-Supplied Cleanable Type

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.

R-22

Scroll

426 ± 7 320 ± 20

27 ± 4 67 ± 7

/4...FPT

/4 (1050)

Centrifugal Belt Drive

1600 2000

1300

10 x 8

1725

4.2

2.4-3.4

Fasten threaded rods through holes in end frames. Use 2 rods on each

NOTE:

side of unit for a total of 4.

All panels must be in place when rigging.

OPERATING WEIGHT DISTRIBUTION AND

CENTER OF GRAVITY

UNIT 502A

024

036

112/51 143/65 183/83 142/64 2-5 /737 2-3 /686

048

114/52 143/65 186/84 147/67 2-4

060

WEIGHT (lb/kg)

OF CORNER

1234 A B

93/42 108/49 139/63 120/54 2-5 /737 2-1

95/43 113/51 148/67 124/56 2-4

DIMENSIONS

(ft-in./mm)

/4/730 2-2 /660

/4/730 2-23/4/679

/8/651

FIELD-INSTALLED ACCESSORIES

Thermostat and Subbase —

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.

Attractive wall-mounted 24-v

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

DIMENSIONS (in.)

UNIT 502A

024,036

048,060

ABCD

/216 21/281/271/8 x 14

24 21

/431971/8 x 207/

DUCT

OPENING

HEAD PRESSURE CONTROL DAMPER (in.)

BASE UNIT DIMENSIONS

DIMENSIONS (ft-in.)

UNIT 502A

024 036 048 060

ABCDE

2-5 2-1

/42-2 1- 53/41-2 1-1

2-4 2-5 2-3 1-11

2-4

/42-23/41-115/81-87/81-77/

/81- 53/41-2 1-1

/81-87/81-77/

Unit Component Locations

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

PERFORMANCE DATA

GROSS COOLING CAPACITIES

502A024

Tem p

Air Ent

Condenser

(F)

105

115

See Legend on page 7.

72 67 62 72 67 62 72 67 62

27.1 25.3 23.0 27.7 26.4 24.6 27.8 26.9 25.8

13.5 17.0 20.2 14.7 19.4 23.7 15.6 21.5 25.8

SHC

1.64 1.62 1.61 1.65 1.63 1.62 1.65 1.64 1.63

26.6 24.5 20.8 27.4 25.8 22.9 28.0 26.5 25.2

13.4 16.7 19.1 14.7 19.4 22.8 16.0 21.7 25.2

SHC

1.85 1.84 1.80 1.86 1.85 1.82 1.87 1.85 1.84

25.8 22.3 18.4 27.1 24.5 21.2 27.7 25.6 23.6

13.1 15.8 17.9 14.7 18.9 21.2 16.2 21.5 23.6

SHC

2.09 2.05 1.99 2.11 2.08 2.04 2.12 2.10 2.07

24.6 19.9 16.5 26.1 22.0 19.8 26.8 23.6 22.3

12.7 14.8 16.5 14.4 17.9 19.8 16.0 20.7 22.3

SHC

2.36 2.29 2.22 2.39 2.33 2.29 2.39 2.35 2.33

Evaporator Air Quantity — Cfm/BF

600/0.02 800/0.03 1000/0.04

Evaporator Air Ewb Temp (F)

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.

Unit 502A024 contains a direct-drive condenser

NOTE:

fan assembly.

502A036

Tem p

Air Ent

Condenser

(F)

SHC kW

105

SHC kW

115

SHC kW

72 67 62 72 67 62 72 67 62

45.0 41.1 37.3 45.8 42.3 38.6 46.5 43.4 39.8

22.5 27.7 32.6 23.6 29.9 35.6 24.6 32.0 38.3

3.19 3.07 2.96 3.22 3.11 3.00 3.25 3.14 3.04

43.0 38.8 34.3 44.1 40.1 35.8 45.0 44.2 37.4

21.8 26.8 31.1 23.1 29.1 34.1 24.4 31.3 36.8

3.42 3.28 3.15 3.46 3.33 3.20 3.49 3.37 3.25

40.4 35.8 29.6 41.6 37.1 31.3 42.6 38.2 33.2

20.9 25.6 28.5 22.3 27.9 30.8 23.7 30.2 33.2

3.63 3.48 3.38 3.68 3.53 3.44 3.73 3.58 3.49

37.7 30.6 25.8 38.7 31.6 37.8 39.7 32.8 29.7

19.9 23.3 25.8 21.3 25.5 27.8 22.7 27.8 29.7

3.85 3.71 3.59 3.90 3.76 3.67 3.94 3.80 3.73

Evaporator Air Quantity — Cfm/BF

900/0.01 1050/0.01 1200/0.02

Evaporator Air Ewb Temp (F)

PERFORMANCE DATA (cont)

GROSS COOLING CAPACITIES (cont)

502A048

Tem p

Air Ent

Condenser

(F)

SHC kW

105

SHC kW

115

SHC kW

BF — Ewb — kW — SHC — TC —

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.

BYPASS FAC TO R

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

1200/0.06 1600/0.08 2000/0.10

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

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

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

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

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

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

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

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

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

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

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

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

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

Bypass Factor Entering Wet-Bulb Compressor Motor Power Input (kilowatts) Gross Sensible Heat Capacity (1000 Btuh) Gross Total Cooling Capacity (1000 Btuh)

(BF)

.025 .05 .10 .20 .30 .35

Evaporator Air Quantity Cfm/BF

Evaporator Air Ewb Temp (F)

LEGEND

ENTERING AIR DRY-BULB TEMPERATURE (F) 79 78 77 76 75 Under 75 81 82 83 84 85 Over 85

1.07 2.12 3.19 4.25 5.32

1.04 2.07 3.11 4.14 5.18 .98 1.96 2.94 3.92 4.90 .87 1.74 2.62 3.49 4.36 .76 1.53 2.29 3.05 3.82 .71 1.42 2.13 2.83 3.54

Correction Factor

Use formula

shown below

502A060

Tem p

Air Ent

Condenser

(F)

105

115

The following formulas may be used:

ldb

= Wet-bulb temperature corresponding to enthalpy of air leaving

lwb

Where: h

= Enthalpy of air entering evaporator coil

ewb

72 67 62 72 67 62 72 67 62

64.8 58.5 52.9 68.0 61.5 56.3 68.9 62.5 58.0

33.2 41.1 48.5 37.2 47.3 55.7 38.9 50.0 57.7

SHC

4.49 4.29 4.13 4.59 4.83 4.22 4.62 4.41 4.27

61.9 55.7 50.2 65.1 58.7 54.0 66.1 59.7 55.8

32.3 40.1 47.3 36.4 46.5 54.0 38.2 49.3 55.8

SHC

4.94 4.72 4.57 5.04 4.81 4.67 5.07 4.84 4.72

58.5 52.4 47.2 61.5 55.2 51.4 62.6 56.3 53.3

31.1 38.8 45.8 35.2 45.2 51.4 37.1 48.1 58.2

SHC

5.41 5.20 5.04 5.51 5.28 5.16 5.55 5.32 5.22

54.9 49.0 44.1 57.8 51.7 48.7 58.7 52.6 50.4

29.8 37.5 44.0 34.0 43.9 48.7 35.9 46.7 50.4

SHC

5.93 5.72 5.56 6.04 5.80 5.70 6.07 5.83 5.75

sensible capacity (Btuh)

–

edb

evaporator col (h

total capacity (Btuh)

–

ewb

Evaporator Air Quantity — Cfm/BF

1500/0.06 2000/0.09 2250/0.10

Evaporator Air Ewb Temp (F)

1.10 x cfm

lwb

4.5 x cfm

EVAPORATOR FAN PERFORMANCE

CFM

ESP Fan kW ESP Fan kW ESP Fan kW ESP Fan kW

600 700 800 900

1000 1100 1200 1300

1400 1500 1600 1700

1800 1900 2000

ESP — kW —

External Static Pressure (in. wg) 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.

024 036 048* 060*

.60 .20 —————— .54 .22 —————— .43 .24 —————— .29 .26 .69 .44 ————

.11 .29 .57 .46 ————

——.42 .49 1.10 .45 1.11 .52 ——.23 .52 1.01 .49 1.045 .55 ————.90.51 .97.57

————.79.55 .88.59 ————.67.58 .78.62 ————.54.61 .67.64 ————.39.64 .53.67

————.22.67 .52.70 ————.03.70 .40.74 ——————.28 .78

LEGEND

UNIT SIZE — 502A

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.

PERFORMANCE DATA (cont)

BELT DRIVE EVAPORATOR FAN PERFORMANCE

CFM

1800 1850 1900

1950 2000 2050 2100

2150 2200 2250

ESP — kW —

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

NOTE:

maximum.

condensate problems.

(Special Order Only, Pricing and

ordering on related price pages.)

UNIT SIZE — 502A

048 060

ESP Fan kW ESP Fan kW

———— ———— ————

.81 1.03 —— .72 1.05 —— .63 1.07 —— .55 1.08 1.02 1.17

.47 1.11 .93 1.21 .42 1.14 .84 1.24 .34 1.17 .75 1.27

LEGEND

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

Unit operation beyond that limit may result in blow-off and

CONDENSER FAN PERFORMANCE

UNIT 502A

024

036

048

060

COND

CFM

1525 Note 4 .66 ———————————— 1475 ——Note 4 .64 —————————— 1400 ————Note 4 .63 ———————— 1350 ——————Note 4 .62 —————— 1300 ————————Note 4 .62 ————

1650 2 .84 ———————————— 1600 —— 2.82—————————— 1550 ———— 2.80———————— 1500 3 .72 ———— 2.781.84———— 1450 4 .63 3 .70 ———— 2 .76 1 .83 —— 1400 —— 4.613.68—————— 1.81 1350 5 .51 ———— 3.67—— 2.73—— 1300 —— 5.504.57—— 3.65—— 2.71

2700 2 .90 ———————————— 2600 —— 2.87—————————— 2550 3 .81 ———————————— 2450 —— 3.772.831.89—————— 2350 —————— 2.801.86———— 2300 4 .68 —— 3.74———— 0.90—— 2200 —— 4.66———— 2 .77 1 .82 0 .86

3100 3 1.34 ———————————— 3000 —— 31.32—————————— 2900 —————— 21.39—————— 2850 4 1.11 —— 31.24———————— 2750 —— 41.07———— 21.32———— 2700 —————— 31.17—————— 2650 ———————————— 11.37 2600 5 .95 —— 41.01———— 21.26—— 2550 ———————— 31.12———— 2500 —— 5.92—————————— 2450 —————— 4.97———— 21.21 2400 ———— 5.90———— 31.08——

0.0 0.1 0.2 0.3 0.4 0.5 0.6

Turns kW Turns kW Turns kW Turns kW Turns kW Turns kW Turns kW

EXTERNAL STATIC PRESSURE (in. wg)

LEGEND

Total Fan Motor Power Input (kilowatts)

kW — NOTES:

1. Above fan performance is based upon coil and deducted casing losses only.

2. External static pressure (ESP) is measured in inches water gage (in. wg).

3. Interpolation is permissible. Do not extrapolate.

4. Condenser fan on unit size 024 only, is direct drive.

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.

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 —

continuous operation by setting the fan switch to ON.

ELECTRICAL DATA

The thermostat can be set for

UNIT 502A

024

036

048

048*

060

060*

HACR — Hp — FLA — LRA — MOCP — RLA —

ELECTRIC HEATER

MCA — MOCP —

(60 Hz)

208/230-3 187 254 10.2 77.0 .50 3.20 .75 3.93 19.9 25

208/230-3 187 254 13.5 99.0 .75 4.00 1.0 3.93 24.8 35

208/230-3 187 254 13.5 99.0 1.5 5.60 1.0 3.93 26.4 35

208/230-3 187 254 17.3 123.0 .75 4.00 1.5 4.82 30.4 45

208/230-3 187 254 17.3 123.0 1.5 5.60 1.5 4.82 32.0 40

Heating, Air Conditioning, and Refrigeration Horsepower Full Load Amps Locked Rotor Amps Maximum Overcurrent Protection (HACR breaker) Rated Load Amps

UNIT 88EN

0050CA01 0075CA01 0115CA01

0075EA01

1150EA01

0100EA01

0150EA01

0200EA01

0300EA01

0300CA01

0100FA01 0150FA01 0200FA01 0300FA01

Minimum Circuit Ampacity Maximum Overcurrent Circuit Protection (Fuses or Circuit Breaker)

V- PH

230-1 207 254 11.5 62.5 .17 1.10 .50 3.40 19.1 25 230-1 207 254 17.2 96.0 .50 3.20 .75 6.06 29.5 40

460-3 414 508 4.3 37.0 .50 1.50 .75 1.97 8.8 15 230-1 207 254 23.7 129.0 .75 4.00 1.0 8.35 42.0 60

460-3 414 508 7.4 49.5 .75 2.15 1.0 1.97 13.4 15 575-3 518 632 5.8 40.0 .75 1.40 1.0 1.45 10.1 15

460-3 414 508 7.4 49.5 1.5 2.80 1.0 1.97 14.0 20 230-1 207 254 28.8 169.0 .75 4.00 1.5 9.50 49.5 70

460-3 414 508 9.0 62.0 .75 2.15 1.5 2.41 15.8 25 575-3 518 632 7.1 50.0 .75 1.40 1.5 1.90 12.2 20

460-3 414 508 9.0 62.0 1.5 2.80 1.5 2.41 16.5 25

VOLTAGE RANGE COMPRESSOR

Min Max RLA LRA Hp FLA Hp FLA

LEGEND

Evaporator Condenser

*Optional evaporator-fan motor nameplate data.

FAN MOTORS POWER SUPPLY

Min Ckt

Amps

MOCP Amps

ELECTRIC HEATER DATA

BRANCH CIRCUIT

LEGEND

USED WITH

UNIT 502A

024, 036

1-Stage Heat

048, 060

2-Stage Heat

V-PH

(60 Hz)

240-1 5.0 20.8 26.0 30 240-1 7.5 31.3 39.1 40 240-1 11.5 47.9 59.9 60

208-3 5.6 15.6 19.5 20 240-3 7.6 18.0 22.6 25

208-3 11.3 31.2 39.0 40 240-3 15.0 36.1 45.1 50

208-3 7.5 20.8 26.0 30 240-1* 10.0 41.7 52.1 60 240-3 10.0 24.1 30.1 35

208-3 11.3 31.2 39.0 40 240-1* 15.0 62.5 78.1 80 240-3 15.0 36.1 45.1 50

208-3 15.0 41.7 52.1 60 240-1* 20.0 83.3 104.2 110 240-3 20.0 46.9 58.6 60

208-3 22.5 62.5 78.2 80 240-3 30.0 72.2 90.2 100

240-1 30.0 124.0 155.0 175 480-3 10.0 12.0 15.0 15

480-3 15.0 18.1 22.6 25 480-3 20.0 24.1 30.1 35 480-3 30.0 36.1 45.1 50

CAP. (kW)

Heater Amps MCA MOCP (Amps)

*May be field converted to single-phase units, see electric heat installa-

tion instructions.

Separate power source is required for all heaters. Control from

NOTE:

base unit 502A (24 v).

ELECTRIC HEATER

UNIT 88EN

0050CA01 0075CA01 0115CA01

0075EA01 1150EA01

0100EA01 0150EA01

0200EA01 0300EA01

0300CA01

0100FA01 0150FA01

0200FA01 0300FA01

Above electric heaters are

NOTE:

ELECTRICAL DATA (cont)

ELECTRIC HEATER STATIC PRESSURE DROP (in. wg)

UNIT 502A

MIN

CFM

600 800 1000 1200 1400 1600 1800 2000 2200

400 .02 .04 .06 .10 —————

024, 036

1-stage

heat

048, 060

2-stage

heat

UL or CSA listed for use with optional high-static evaporator-fan motor (048, 060 units only).

not

510 .03 .06 .10 .16 ————— 620

320 720

970

1240 1350

1220 1220

1130 1360

1350 1270

.04 .08 .13 .19 —————

———.04 .06 .08 .12 .15 .17

———.08 .11 .14 .18 .22 .26

———.04 .06 .08 .12 .15 .17

———.08 .11 .14 .18 .22 .26

UNIT CFM

TYPICAL WIRING SCHEMATICS

NOTES:

1. Compressor and fan motors are ther mally 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.

LEGEND

AHA — BKR W/AT — C — CB — CC — CLO — CT — EQUIP GND — HPS — HR — IFC — IFR — JB — L — LOR —

Adjustable Heat Anticipator Brakes with Amp Turns Contactor Compressor Circuit Breaker Cooling Compensator Compressor Lockout Current Transformer Equipment Ground High-Pressure Switch Heater Relay Indoor (Evaporator) Fan Contactor Indoor (Evaporator) Fan Relay Junctio n Box Light Lockout Relay

LPS — NEC — PL — TB — TC — TH —

TRAN —

Low-Pressure Switch National Electrical Code Plug Assembly Terminal Block Thermostat-Cooling Thermostat-Heating

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

Te r mi na l Bl oc k

Field Splice

Splice (Marked)

Factory Splice Factory Wiring Accessory or Optional Wir ing Field Control Wiring Field Power Wiring To indicate common potential

only, not to represent wiring

TYPICAL WIRING SCHEMATICS (cont)

AHA — C — CAP — CB — CC — CDT — COMP — EQUIP — FU — GND — HPS — HR — IFC — IFM — IFR — JB — L — LPS — NS — OAT — OFC — OFM — PL — QT — RC — SW — TB — TC —

LEGEND

Adjustable Heat Anticipator Contactor Compressor Capacitor Circuit Breaker Cooling Compensator Compressor Discharge Thermostat Compressor Motor 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 Ter minal Run Capacitor Switch Te rm i n al Bl o c k 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

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)

AHA — C — CAP — CB — CC — CDT — CH — COMP — EQUIP — GND — HPS — HR — IFC — IFM — IFR — JB — L — LPS — NEC — OFM — PL — QT — RC — TB — TC — TH — TRAN —

LEGEND

Adjustable Heat Anticipator Contactor Compressor Capacitor Circuit Breaker Cooling Compensator Compressor Discharge Thermostat Crankcase Heater Compressor Motor Equipment Ground High-Pressure Switch Heater Relay Indoor-Fan Contactor Indoor-Fan Motor Indoor-Fan Relay Junction Box Light Low-Pressure Switch National Electrical Code Outdoor-Fan Motor Plug Assembly Quadruple Ter minal Run Capacitor Te rm i n al Bl o c k Thermostat-Cooling 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

502A048,060, 230-1-60 Units

NOTES:

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

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)

AHA — BKR W/AT — C — CC — CLO — COMP — CT — EQUIP — GND — HPS — IFC — IFM — IFR — JB — L — LOR — LPS — NEC — OFM — PL — PRI — TB — TC — TH — TRAN —

Adjustable Heat Anticipator Breaks with Amp Turns Contactor Compressor Cooling Compensator 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 Low-Pressure Switch National Electrical Code Outdoor-Fan Motor Plug Assembly Primary Te rm i n al Bl o c k 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

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.

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

National Electrical Code

NEC — 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.

APPLICATION DATA

OUTDOOR-AIR TEMPERATURE OPERATING LIMITS (F)

UNIT 502A 024 036 048 060

Without Head Pressure Control Minimum

With Head Pressure Control Minimum

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

/8-in. OD copper tubing, and discharge line is 1/2-in. OD

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

Maximum

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.

35 35 40 40

126 126 126 126

0000

126 126 126 126

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],

/64-in. thick insulation). Field wiring should be a minimum of

no. 16 AWG,

/64-in. thick insulation. Check all applicable electri-

cal codes to ensure proper compliance.

GUIDE SPECIFICATIONS

INDOOR PACKAGED UNIT

HVAC GUIDE SPECIFICATIONS — SECTION 15787 SIZE RANGE: 2 TO 5 TONS, NOMINAL BRYANT MODEL NUMBER: 502A

PAR T 1 — GENERAL

1.01 SYSTEM DESCRIPTION Indoor mounted, electrically controlled packaged horizon-

tal cooling unit utilizing a hermetic type scroll compressor.

1.02 QUALITY ASSURANCE

A. Unit shall be certified in accordance with ARI Stand-

ard 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 perfor-

mance 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.

PAR T 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 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

/4-in. threaded condensate drain connections below the evaporator coil and one 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.

/2-in. thick neoprene

/4-in.

C. Fans:

1. Evaporator: a. Blower shall be of the forward-curved, centrifugal,

direct-drive type or belt drive (4 and 5 tons only).

b. Motor shall have permanently lubricated

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).

b. Motor shall have permanently lubricated

bearings.

D. C omp r essor :

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 horizon-

tal 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.

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 ambi- ent temperature. Package shall include damper operating device and all necessary hardware.

GUIDE SPECIFICATIONS (cont)

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.

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

UNIT MUST BE INSTALLED IN ACCORDANCE

WITH INSTALLATION INSTRUCTIONS

Bryant 502A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual