HORIZONTAL INDOOR
SINGLE PACKAGE
COOLING UNITS
Model 502A
CeilingPAC
2 to 5 Tons
Single Package Cooling Units Featuring:
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.
• compact design
• flexibility
• easy maintenance
• high quality and reliability
• quiet and efficient scroll compressor technology
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 compo-
nents 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.
FEATURES/BENEFITS
All in one package — high cooling efficiency, installation con-
venience, ease of accessibility for time-saving maintenance.
SPACE AND COST-SAVING DESIGN — Model 502A is spe-
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 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.
BRYANT QUALITY AND RELIABILITY — The Bryant 502A
CeilingPAC units have much to offer the cost- and efficiency-
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 — Scroll compres-
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.
APPLICATION FLEXIBILITY — If desired for particular appli-
cations, the unit can also be installed as a split system with the
condenser section mounted horizontally. Centrifugal fans per-
mit ducting of both evaporator and condenser air.
QUIET OPERATION — Commercial end users appreciate the
extra comfort of quiet operation. Bryant engineers met the
Form No. PDS 502A.24.1
PHYSICAL DATA
UNIT 502A
024
036
048
060
SHIPPING WEIGHT (lb)*
560
590
690
700
OPERATING WEIGHT (lb)
Base Unit
REFRIGERANT TYPE
Operating Charge (lb)†
COMPRESSOR — TYPE
450
5.4
480
5.5
580
8.0
590
7.6
R-22
Scroll
Quantity...Model
(1)...ZR23
24
(1)...ZR34
(1)...ZR49
48
(1)...ZR57
54
Oil (oz)
42
HPS Setting (psig)
Cutout
426
7
Reset
320 20
LPS Setting (psig)
Cutout
27
67
4
7
Reset
CONDENSATE DRAIN CONNECTION
Size (in.)...Type
3/4...FPT
CONDENSER FAN
Centrifugal — Direct Drive
Centrifugal — Belt Drive
Nominal Cfm
1350
1350
2250
2450
Maximum Rpm
1100
12 x 6
1500
12 x 9
Blower Size (in.)
Pulley Pitch Diameter (in.)
Blower
Motor (Variable)
Motor Hp
Motor Rpm
None
None
5.0
6.0
1.9-2.9
1
6.0
2.4-3.4
2.4-3.4
1
/
3
/
1
1 /2
2
4
825
1725
1725
1725
EVAPORATOR AIR FAN (Standard)
Centrifugal — Direct Drive
Nominal Cfm
Max Rpm
Blower Size (in.)
Motor Hp (Rpm)
800
1200
1150
1600
2000
1100
1050
10 x 6
/4 (1050)
10 x 5
6 (850)
10 x 6
1
1
3
/
/
2 (1075)
EVAPORATOR AIR FAN (Optional)
Centrifugal Belt Drive
Nominal Cfm
Max Rpm
1600
2000
1300
10 x 8
11/2
Blower Size (in.)
Motor Hp
Not
Available
Motor Rpm
1725
Pulley Pitch Diameter (in.)
Blower
4.2
2.4-3.4
Motor (Variable)
CONDENSER COIL
Copper Tubes — Aluminum Fins
Size (L x H) (in.)
Number of Rows...Fins/in.
EVAPORATOR COIL
40 x 15
4...13.6
40 x 16
40 x 22
4...13.6
4...17
Copper Tubes — Aluminum Fins
Size (L x H) (in.)
Number of Rows...Fins/in.
34 x 15
4...14.4
34 x 16
4...15
34 x 22
4...14.4
INDOOR-AIR FILTERS
Factory-Supplied Cleanable Type
Number...Size (in.)
1...14 x 34 x 1
1...21 x 34 x 1
INTERCONNECTING TUBING SIZE (in.)**
Hot Gas
Liquid
1
/
1
/
1
3
1
/
/
/
/
2
2
2
8
2
3
3
3
/
/
8
8
8
LEGEND
High-Pressure Switch
Low-Pressure Switch
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 rep-
resentative for more information.
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.
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.
OPERATING WEIGHT DISTRIBUTION AND
CENTER OF GRAVITY
WEIGHT (lb/kg)
OF CORNER
DIMENSIONS
(ft-in./mm)
UNIT
502A
1
2
3
4
A
B
024
036
048
060
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
2-43/4/730
2-5 /737
2-43/4/730
2-15/8/651
2-2 /660
2-3 /686
2-23/4/679
3
FIELD-INSTALLED ACCESSORIES
Thermostat and Subbase — 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.
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.
Head Pressure Control Damper — This accessory is duct
mounted and allows unit to mechanically cool down to 0° F.
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 compres-
sor from restarting for 5 minutes after shutdown.
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.
Electric Heaters — A wide range of models available from 5 to
30 kW, 208-, 240- and 480-v, single- and 3-ph units. Mount eas-
ily on 502A discharge opening. Heater control box accessible
from the bottom of heater.
Vibration Isolators — Package of four isolators used for damp-
ening 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
DUCT
OPENING
A
B
C
D
131/2 16
24 213/4
21/2 81/2
19
71/8 x 14
024,036
048,060
3
71/8 x 207/8
4
BASE UNIT DIMENSIONS
DIMENSIONS (ft-in.)
UNIT
502A
024
036
048
060
A
B
C
D
E
2-5
2-15/8
2-2
2-3
2-23/4
1- 53/4
1- 53/4
1-115/8 1-87/8
1-115/8 1-87/8
1-2
1-2
1-1
2-43/4
2-5
1-1
1-77/8
1-77/8
2-43/4
Unit Component Locations
5
SELECTION PROCEDURE (with example)
I DETERMINE COOLING REQUIREMENTS AT DESIGN
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.
CONDITIONS.
Given:
Gross Cooling Capacity
III DETERMINE EVAPORATOR FAN PERFORMANCE.
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
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.
of 0.06 in. wg) . . . . . . . . . . . . . . . . . . . . . . 0.20 in. wg
NOTE: Unit 502A024 contains a direct-drive condenser
fan assembly.
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
502A036
Evaporator Air Quantity — Cfm/BF
600/0.02 800/0.03 1000/0.04
Evaporator Air Ewb Temp (F)
62 72 67 62 72
27.1 25.3 23.0 27.7 26.4 24.6 27.8 26.9 25.8
Evaporator Air Quantity — Cfm/BF
Temp
Air Ent
Condenser
(F)
Temp
Air Ent
Condenser
(F)
900/0.01
1050/0.01
1200/0.02
Evaporator Air Ewb Temp (F)
72
67
67
62
72
67
62
72
67
62
72
67
62
TC
TC
45.0 41.1 37.3 45.8 42.3 38.6 46.5 43.4 39.8
85 SHC 13.5 17.0 20.2 14.7 19.4 23.7 15.6 21.5 25.8
85 SHC 22.5 27.7 32.6 23.6 29.9 35.6 24.6 32.0 38.3
kW
TC
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
kW
TC
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
95 SHC 13.4 16.7 19.1 14.7 19.4 22.8 16.0 21.7 25.2
95 SHC 21.8 26.8 31.1 23.1 29.1 34.1 24.4 31.3 36.8
kW
TC
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
kW
TC
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
105 SHC 13.1 15.8 17.9 14.7 18.9 21.2 16.2 21.5 23.6
105 SHC 20.9 25.6 28.5 22.3 27.9 30.8 23.7 30.2 33.2
kW
TC
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
kW
TC
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
115 SHC 12.7 14.8 16.5 14.4 17.9 19.8 16.0 20.7 22.3
115 SHC 19.9 23.3 25.8 21.3 25.5 27.8 22.7 27.8 29.7
kW
2.36 2.29 2.22 2.39 2.33 2.29 2.39 2.35 2.33
kW
3.85 3.71 3.59 3.90 3.76 3.67 3.94 3.80 3.73
See Legend on page 7.
6
PERFORMANCE DATA (cont)
GROSS COOLING CAPACITIES (cont)
502A060
502A048
Evaporator Air Quantity Cfm/BF
Evaporator Air Quantity — Cfm/BF
Temp
Air Ent
Condenser
(F)
Temp
Air Ent
Condenser
(F)
1200/0.06
1600/0.08
Evaporator Air Ewb Temp (F)
72 67 62 57 72 67 62 57 72 67 62 57
2000/0.10
1500/0.06
2000/0.09
2250/0.10
Evaporator Air Ewb Temp (F)
72
67
62
72
67
62
72
67
62
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
TC
64.8 58.5 52.9 68.0 61.5 56.3 68.9 62.5 58.0
85 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
85 SHC 33.2 41.1 48.5 37.2 47.3 55.7 38.9 50.0 57.7
kW
TC
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
kW
TC
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
95 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
95 SHC 32.3 40.1 47.3 36.4 46.5 54.0 38.2 49.3 55.8
kW
TC
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
kW
TC
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
105 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
105 SHC 31.1 38.8 45.8 35.2 45.2 51.4 37.1 48.1 58.2
kW
TC
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
kW
TC
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
115 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
115 SHC 29.8 37.5 44.0 34.0 43.9 48.7 35.9 46.7 50.4
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
kW
5.93 5.72 5.56 6.04 5.80 5.70 6.07 5.83 5.75
LEGEND
The following formulas may be used:
BF
—
—
—
—
—
Bypass Factor
sensible capacity (Btuh)
Ewb
kW
Entering Wet-Bulb
t
t
= t
=
–
ldb
edb
Compressor Motor Power Input (kilowatts)
Gross Sensible Heat Capacity (1000 Btuh)
Gross Total Cooling Capacity (1000 Btuh)
1.10 x cfm
SHC
TC
Wet-bulb temperature corresponding to enthalpy of air leaving
lwb
evaporator col (h ).
lwb
NOTES:
1. Performance based on nominal condenser airflow listed in physical data table
on page 3.
total capacity (Btuh)
h
= h
–
lwb
ewb
2. SHC is based on 80 F db temperature of air entering the coil.
4.5 x cfm
Below 80 F db, subtract (corr factor x cfm) from SHC.
Above 80 F db, add (corr factor x cfm) to SHC.
Where:
h
= Enthalpy of air entering evaporator coil
ewb
ENTERING AIR DRY-BULB TEMPERATURE (F)
BYPASS
FACTOR
(BF)
79
81
78
82
77
83
76
84
75
85
Under 75
Over 85
Correction Factor
.025
.05
.10
.20
.30
.35
1.07
1.04
.98
2.12
2.07
1.96
1.74
1.53
1.42
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
.87
.76
.71
Correction Factor = 1.10 x (1 – BF) x db – 80)
EVAPORATOR FAN PERFORMANCE
UNIT SIZE — 502A
CFM
024
036
048*
060*
ESP
Fan kW
ESP
Fan kW
ESP
Fan kW
ESP
Fan kW
600
700
800
900
.60
.54
.43
.29
.20
.22
.24
.26
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
.69
.44
1000
1100
1200
1300
.11
—
.29
—
—
—
.57
.42
.23
—
.46
.49
.52
—
—
—
—
—
1.10
1.01
.90
.45
.49
.51
1.11
1.045
.97
.52
.55
.57
—
—
1400
1500
1600
1700
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
.79
.67
.54
.39
.55
.58
.61
.64
.88
.78
.67
.53
.59
.62
.64
.67
1800
1900
2000
—
—
—
—
—
—
—
—
—
—
—
—
.22
.03
—
.67
.70
—
.52
.40
.28
.70
.74
.78
LEGEND
ESP — External Static Pressure (in. wg)
kW
Total Fan Motor Power Input (kilowatts)
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.
*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.
7
PERFORMANCE DATA (cont)
BELT DRIVE EVAPORATOR FAN PERFORMANCE
(Special Order Only, Pricing and
ordering on related price pages.)
UNIT SIZE — 502A
CFM
048
060
ESP
Fan kW
ESP
Fan kW
1800
1850
1900
—
—
—
—
—
—
—
—
—
—
—
—
1950
2000
2050
2100
.81
.72
.63
.55
1.03
1.05
1.07
1.08
—
—
—
—
—
—
1.02
1.17
2150
2200
2250
.47
.42
.34
1.11
1.14
1.17
.93
.84
.75
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)
UNIT
502A
COND
CFM
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
1525
1475
1400
1350
1300
1650
1600
1550
1500
1450
1400
1350
1300
Note 4
—
.66
—
—
—
—
.84
—
—
.72
.63
—
.51
—
—
—
.64
—
—
—
—
—
—
—
.63
—
—
—
—
—
—
—
—
.62
—
—
—
—
—
—
—
—
—
.62
—
—
—
—
—
—
—
—
—
1
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Note 4
—
024
036
—
Note 4
—
—
—
—
—
—
2
—
—
3
4
—
5
Note 4
—
—
Note 4
2
—
—
3
—
—
—
2
—
—
3
—
4
—
—
—
—
—
2
—
—
—
—
1
—
—
—
—
—
—
—
1
—
.82
—
—
—
—
—
.80
—
—
—
—
—
—
.78
—
.84
.76
—
—
—
4
.70
.61
—
—
—
—
3
2
.83
—
—
—
5
.68
—
—
—
—
3
—
2
—
.81
—
.67
—
—
.65
.73
—
—
2
—
.50
.57
—
.71
2700
2600
2550
2450
2350
2300
2200
3100
3000
2900
2850
2750
2700
2650
2600
2550
2500
2450
2400
2
—
3
—
—
4
—
3
.90
—
—
2
—
—
—
—
2
—
—
—
—
1
—
—
—
—
—
1
—
—
—
—
—
—
0
—
—
—
—
—
—
—
0
—
—
—
—
—
—
1
—
—
—
—
—
—
.86
.87
—
—
—
—
—
.81
—
—
3
—
—
—
—
—
048
060
.77
—
.83
—
.89
.80
—
—
—
.68
—
—
—
4
—
3
—
—
4
—
—
—
—
5
—
—
—
3
2
.86
—
—
—
.74
—
—
—
—
—
2
—
—
3
—
2
.90
.82
.66
—
—
—
—
.77
1
1.34
—
—
1.32
—
—
—
—
3
—
—
—
4
—
—
—
5
—
—
—
—
—
—
—
2
—
—
—
3
—
—
—
—
—
—
—
—
—
2
—
—
—
3
—
—
—
—
—
—
4
—
1.39
—
—
—
—
1.11
—
—
1.24
—
—
—
—
—
—
—
5
—
—
—
—
1.07
—
—
1.32
—
—
—
—
—
—
—
1.17
—
—
—
—
—
—
—
—
4
—
—
—
1.37
—
.95
—
—
1.01
—
—
1.26
—
—
—
—
2
—
—
1.12
—
—
—
—
.92
—
—
—
—
—
—
—
—
—
.97
—
—
—
—
1.21
—
—
—
.90
—
1.08
—
LEGEND
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.
kW — Total Fan Motor Power Input (kilowatts)
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.
8
CONTROLS
2. When room thermostat is satisfied, the evaporator fan, com-
OPERATING SEQUENCE
Cooling
pressor, and condenser fan shut off.
Continuous Fan Operation — The thermostat can be set for
continuous operation by setting the fan switch to ON.
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 single-
phase units).
ELECTRICAL DATA
FAN MOTORS
Evaporator Condenser
POWER SUPPLY
VOLTAGE RANGE
COMPRESSOR
UNIT
502A
V-PH
(60 Hz)
Min Ckt
Amps
MOCP
Amps
Min
Max
RLA
LRA
Hp
FLA
Hp
FLA
024
036
230-1
207
254
11.5
62.5
.17
1.10
.50
3.40
19.1
25
230-1
208/230-3
460-3
207
187
414
254
254
508
17.2
10.2
4.3
96.0
77.0
37.0
.50
.50
.50
3.20
3.20
1.50
.75
.75
.75
6.06
3.93
1.97
29.5
19.9
8.8
40
25
15
230-1
208/230-3
460-3
207
187
414
518
187
414
207
187
414
518
254
254
508
632
254
508
254
254
508
632
23.7
13.5
7.4
129.0
99.0
49.5
40.0
99.0
49.5
.75
.75
.75
.75
1.5
1.5
.75
.75
.75
.75
4.00
4.00
2.15
1.40
5.60
2.80
4.00
4.00
2.15
1.40
1.0
1.0
1.0
1.0
1.0
1.0
1.5
1.5
1.5
1.5
8.35
3.93
1.97
1.45
3.93
1.97
9.50
4.82
2.41
1.90
42.0
24.8
13.4
10.1
26.4
14.0
49.5
30.4
15.8
12.2
60
35
15
15
35
20
70
45
25
20
048
048*
060
575-3
5.8
208/230-3
460-3
13.5
7.4
230-1
208/230-3
460-3
28.8
17.3
9.0
169.0
123.0
62.0
575-3
7.1
50.0
208/230-3
460-3
187
414
254
508
17.3
9.0
123.0
62.0
1.5
1.5
5.60
2.80
1.5
1.5
4.82
2.41
32.0
16.5
40
25
060*
LEGEND
*Optional evaporator-fan motor nameplate data.
HACR — Heating, Air Conditioning, and Refrigeration
Hp
— Horsepower
FLA
LRA
— Full Load Amps
— Locked Rotor Amps
MOCP — Maximum Overcurrent Protection (HACR breaker)
RLA
— Rated Load Amps
ELECTRIC HEATER DATA
CAP. (kW)
BRANCH CIRCUIT
MCA
ELECTRIC HEATER
USED WITH
UNIT 502A
V-PH
(60 Hz)
UNIT 88EN
Heater Amps
MOCP (Amps)
0050CA01
0075CA01
0115CA01
240-1
240-1
240-1
208-3
240-3
5.0
7.5
20.8
31.3
47.9
15.6
18.0
26.0
39.1
59.9
19.5
22.6
30
40
60
20
25
11.5
024, 036
1-Stage Heat
5.6
7.6
11.3
15.0
0075EA01
1150EA01
208-3
240-3
31.2
36.1
39.0
45.1
40
50
208-3
240-1*
240-3
208-3
240-1*
240-3
208-3
240-1*
240-3
7.5
10.0
10.0
11.3
15.0
15.0
15.0
20.0
20.0
20.8
41.7
24.1
31.2
62.5
36.1
41.7
83.3
46.9
26.0
52.1
30.1
39.0
78.1
45.1
52.1
104.2
58.6
30
60
35
40
80
50
60
110
60
0100EA01
0150EA01
0200EA01
048, 060
2-Stage Heat
208-3
240-3
240-1
22.5
30.0
30.0
62.5
72.2
124.0
78.2
90.2
155.0
80
0300EA01
0300CA01
100
175
0100FA01
0150FA01
0200FA01
0300FA01
480-3
480-3
480-3
480-3
10.0
15.0
20.0
30.0
12.0
18.1
24.1
36.1
15.0
22.6
30.1
45.1
15
25
35
50
LEGEND
*May be field converted to single-phase units, see electric heat installa-
tion instructions.
NOTE: Separate power source is required for all heaters. Control from
base unit 502A (24 v).
MCA
—
Minimum Circuit Ampacity
MOCP — Maximum Overcurrent Circuit Protection
(Fuses or Circuit Breaker)
9
ELECTRICAL DATA (cont)
ELECTRIC HEATER STATIC PRESSURE DROP (in. wg)
UNIT CFM
1400
—
ELECTRIC HEATER
UNIT 88EN
UNIT
502A
MIN
CFM
600
.02
.03
800
.04
.06
1000
.06
1200
.10
1600
—
1800
—
2000
—
2200
—
0050CA01
0075CA01
0115CA01
0075EA01
1150EA01
0100EA01
0150EA01
0200EA01
0300EA01
0300CA01
400
510
620
320
720
024, 036
1-stage
heat
.10
.16
—
—
—
—
—
.04
—
.08
—
.13
—
.19
.04
.08
—
—
—
—
—
970
1240
.06
.11
.08
.14
.12
.18
.15
.22
.17
.26
1350
1220
1220
1130
1360
—
—
—
048, 060
2-stage
heat
0100FA01
0150FA01
0200FA01
0300FA01
—
—
—
—
—
—
.04
.08
.06
.11
.08
.14
.12
.18
.15
.22
.17
.26
1350
1270
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
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 signi-
fies 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
—
—
—
—
—
—
—
Adjustable Heat Anticipator
Brakes with Amp Turns
Contactor Compressor
Circuit Breaker
Cooling Compensator
Compressor Lockout
Current Transformer
LPS
NEC
PL
—
—
—
—
—
—
Low-Pressure Switch
National Electrical Code
Plug Assembly
Ter minal Block
Field Splice
CB
TB
Terminal Block
CC
CLO
CT
TC
TH
TRAN
Thermostat-Cooling
Thermostat-Heating
Splice (Marked)
Factory Splice
Factory Wiring
—
Transformer
EQUIP GND — Equipment Ground
HPS
HR
IFC
IFR
JB
L
LOR
—
—
—
—
—
—
—
High-Pressure Switch
Heater Relay
Marked Wire
Accessory or Optional Wiring
Field Control Wiring
Field Power Wiring
To indicate common potential
only, not to represent wiring
Denotes connection point between
subbase and thermostat
Indoor (Evaporator) Fan Contactor
Indoor (Evaporator) Fan Relay
Junction Box
Terminal (Marked)
Light
Lockout Relay
Terminal (Unmarked)
502A036,048,060, 208/230-3-60, 460-3-60; and 502A036, 208/230-1-60
10
TYPICAL WIRING SCHEMATICS (cont)
LEGEND
TH
AHA
C
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Adjustable Heat Anticipator
Contactor Compressor
Capacitor
—
—
Thermostat-Heating
Transformer
NOTES:
TRAN
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.
CAP
CB
Circuit Breaker
Marked Wire
CC
Cooling Compensator
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.
Denotes connection point between
subbase and thermostat
CDT
COMP
EQUIP
FU
Compressor Discharge Thermostat
Compressor Motor
Equipment
Terminal (Marked)
Fuse
Ground
High-Pressure Switch
Heater Relay
GND
HPS
HR
Terminal (Unmarked)
Terminal Block
5. Separate field power supply required for electric heater
accessory.
IFC
IFM
IFR
JB
Indoor-Fan Contactor
Indoor-Fan Motor
Indoor-Fan Relay
Junction Box
Field Splice
Splice (Marked)
L
LPS
NS
Light
Factory Splice
Low-Pressure Switch
Night Setback Switch
Outdoor-Air Thermostat
Outdoor-Fan Contactor
Outdoor-Fan Motor
Plug Assembly
Factory Wiring
OAT
OFC
OFM
PL
Accessory or Optional Wiring
Field Control Wiring
Field Power Wiring
QT
Quadruple Terminal
Run Capacitor
RC
SW
TB
Switch
To indicate common potential
only, not to represent wiring
Ter minal Block
TC
Thermostat-Cooling
502A024, 230-1-60 Units
11
TYPICAL WIRING SCHEMATICS (cont)
LEGEND
NOTES:
AHA
C
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Adjustable Heat Anticipator
Contactor Compressor
Capacitor
2. If any original wires furnished must be replaced, it should be
Marked Wire
replaced with 90 C or its equivalent.
CAP
CB
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.
Denotes connection point between
subbase and thermostat
Circuit Breaker
CC
CDT
CH
COMP
EQUIP
GND
HPS
HR
Cooling Compensator
Compressor Discharge Thermostat
Crankcase Heater
Compressor Motor
Equipment
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Ground
High-Pressure Switch
Heater Relay
Field Splice
IFC
IFM
IFR
JB
Indoor-Fan Contactor
Indoor-Fan Motor
Indoor-Fan Relay
Junction Box
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.
Splice (Marked)
Factory Splice
L
Light
Factory Wiring
LPS
NEC
OFM
PL
Low-Pressure Switch
National Electrical Code
Outdoor-Fan Motor
Plug Assembly
Accessory or Optional Wiring
Field Control Wiring
Field Power Wiring
QT
Quadruple Terminal
Run Capacitor
Ter minal Block
Thermostat-Cooling
Thermostat-Heating
Transformer
RC
TB
To indicate common potential
only, not to represent wiring
TC
TH
TRAN
502A048,060, 230-1-60 Units
12
TYPICAL WIRING SCHEMATICS (cont)
LEGEND
AHA
—
Adjustable Heat Anticipator
Denotes connection point between
NOTES:
BKR W/AT — Breaks with Amp Turns
subbase and thermostat
C
CC
CLO
COMP
CT
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Contactor Compressor
Cooling Compensator
Compressor Lockout
Compressor Motor
Current Transformer
Equipment
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.
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
EQUIP
GND
HPS
IFC
Ground
Field Splice
High-Pressure Switch
Indoor-Fan Contactor
Indoor-Fan Motor
Indoor-Fan Relay
Junction Box
Splice (Marked)
IFM
IFR
Factory Splice
JB
L
Light
Lockout Relay
Low-Pressure Switch
National Electrical Code
Outdoor-Fan Motor
Plug Assembly
Primary
Ter minal Block
Thermostat-Cooling
Thermostat-Heating
Transformer
Factory Wiring
LOR
LPS
NEC
OFM
PL
Accessory or Optional Wiring
Field Control Wiring
Field Power Wiring
PRI
TB
To indicate common potential
only, not to represent wiring
TC
TH
TRAN
Marked Wire
502A048,060, 575-3-60 Units
13
TYPICAL PIPING AND WIRING
LEGEND
NEC — National Electrical Code
NOTES:
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.
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
Maximum
35
126
35
126
40
126
40
126
With Head Pressure Control
Minimum
Maximum
0
126
0
126
0
126
0
126
Field Splitting Instructions — If components are split, maxi-
mum 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)
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 outdoor-
fan 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 electri-
cal codes to ensure proper compliance.
14
GUIDE SPECIFICATIONS
INDOOR PACKAGED UNIT
C. Fans:
HVAC GUIDE SPECIFICATIONS — SECTION 15787
SIZE RANGE: 2 TO 5 TONS, NOMINAL
BRYANT MODEL NUMBER: 502A
PART 1 — GENERAL
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.
1.01 SYSTEM DESCRIPTION
c. Unit sizes 048, 060 shall be available with an
optional 1.5 hp fan motor.
Indoor mounted, electrically controlled packaged horizon-
tal cooling unit utilizing a hermetic type scroll compressor.
2. Condenser:
1.02 QUALITY ASSURANCE
a. Blower shall be of the forward-curved, centrifugal,
direct-driven type (024 only), or belt drive
(036,048,060).
A. Unit shall be certified in accordance with ARI Stand-
ard 210.
B. Unit shall be UL listed and carry a UL label.
b. Motor shall have permanently lubricated
bearings.
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.
D. Compressor:
1. Fully hermetic scroll type.
1.03 DELIVERY, STORAGE, AND HANDLING
2. Mounted on suitable spring vibration isolators.
3. Equipped with internal line break protection.
A. Unit shall be shipped completely assembled and ready to
operate.
E. Coils:
B. Unit shall be shipped factory charged with refrigerant
R-22.
Evaporator and condenser coils shall be of non-ferrous
construction with aluminum fins mechanically bonded to
seamless copper tubes with all joints brazed.
C. Unit shall be stored and handled in accordance with the
unit manufacturer’s instructions.
F. Refrigerant Components:
Refrigerant components shall include:
1. Capillary tube feed system.
2. Refrigerant filter-drier.
PART 2 — PRODUCTS
2.01 EQUIPMENT
A. General:
Factory assembled horizontal, single piece, air cooled,
indoor, ceiling plenum mounted electric cooling unit. Con-
tained within the unit enclosure shall be all factory wiring,
piping, controls, refrigerant charge (R-22), and special
features required prior to start-up.
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.
B. Unit Cabinet:
H. Controls and Safeties:
1. Constructed of galvanized steel.
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).
1
2. Interior shall be insulated with /2-in. thick neoprene
coated fiberglass. Insulation shall be bonded to inte-
rior surfaces by sprayed water reduceable adhesive.
3. Equipped with 3 same side access panels and 2 bot-
tom 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.
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.
3
4. Equipped with two /4-in. threaded condensate drain
K. Special Features:
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.
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.
5. Field splittable through the removal of 4 bolts and
extending refrigerant piping and wiring to allow
remote horizontal or vertical condenser mounting.
*
1. Electric Heat Module:
a. Provides encased heater elements that shall
attach directly to the base unit discharge.
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.
b. Shall have bottom access.
c. UL listed.
2. Thermostat Assembly:
7. Contains junction box for power connection and
opening for routing of control wiring.
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:
6. Vibration Isolation Package:
Prevents compressor from restarting for a minimum
of 5 minutes after shutdown.
Shall provide 4 spring hangers for ceiling mounted
unit to damper vibration that may be transmitted to
building structure.
*
*
4. Condensate Pump:
7. Time Guard® II Device:
Unit shall be equipped with remotely located con-
densate pump. A field-installed light shall illuminate
when reservoir rises above a preset level. Unit shall
shut down upon reservoir light illumination.
Time Guard II device (024,048,060 single-phase
only) shall prevent the compressor from restarting for
a minimum of 5 minutes after shutdown.
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.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
UNIT MUST BE INSTALLED IN ACCORDANCE
WITH INSTALLATION INSTRUCTIONS
Copyright 2001 Bryant Heating & Cooling Systems
Printed in U.S.A.
1-01
Catalog No. 5250-200
|