Bryant 502A User Manual
installation, start-up and
service instructions
CEILING
SINGLE PACKAGE COOLING UNITS
PA C
™ HORIZONTAL INDOOR
Cancels: II 502A-24-1 II 502A-36-1
502A
Sizes 036-060
3 to 5 Tons
12/15/05
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6
I. Step 1 — Receive and Inspect Unit . . . . . . . . . . . . . 1
II. Step 2 — Protect Unit from Damage . . . . . . . . . . . . 1
III. Step 3 — Provide Unit Support. . . . . . . . . . . . . . . . . 1
IV. Step 4 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 4
V. Step 5 — Make Piping Connections. . . . . . . . . . . . . 4
VI. Step 6 — Install Ductwork. . . . . . . . . . . . . . . . . . . . . 4
VII. Step 7 — Make Electrical Connections . . . . . . . . . . 4
VIII. Splitting Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
IX. Field Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . 5
X. Thermostat Wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
XI. Step 8 — Fan Speed . . . . . . . . . . . . . . . . . . . . . . . . . 5
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7,8
SAFETY CONSIDERATIONS
Installing and servicing air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions such as cleaning c oils and filters an d replaci ng filters.
All other operations should be performed by trained service
personnel. When working on air-conditioning equipment,
observe precaution s in the lit erature and o n tags and labe ls
attached to unit.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire
extinguisher avail abl e.
WARNING: Before performing service or maintenance operations on unit, turn off main power switch
to unit. Electrical shock can ca use personal injury.
NOTE: Ensure voltage on unit agrees with voltage listed on
the unit rating plate.
GENERAL
The 502A036,048, and 060 units are single-package, indoor,
horizontally mounted air conditioners of 3, 4 and 5 tons
capacity, respectively.
These units can be mounted as factory-shipped singlepackage units or can be separated and mounted as a split
system. If unit is spl it, the co nden ser sec tio n c a n be m oun ted
horizontally.
All units are designed to be ducted on both the condenser
and evaporator sides. Centrifugal blowers are used to ensure
quiet air delivery to the conditioned space. Sound level
requirements should be determined before final unit installation site is chosen.
Unit servicing is relatively simple since access to the condenser and evaporator motors, blowers, belt, and pulley is
gained through removable swing do ors located on bottom of
unit. These d oo rs may al so b e u s ed fo r cl ea n ing o f co nde n ser
coils. Unit side panels provide access to control box and pressure switches.
Refrigeration cycle components (e.g., compressor, filter
drier, etc.) can be serviced upon removal of the base unit
from the space.
INSTALLATION
WARNING: Determine building alterations required
to run piping, wiring, and ductw ork. Follow dimensiona l
drawings carefully for ductwork, piping locations,
electrical wiring, and overall unit dimensions. Read all
installation instructions before starting installation.
The 502A units are intended f o r indoor instal lation only.
I. STEP 1 — RECEIVE AND INSPECT UNIT
Unpack and check unit against shipping order. Inspect carefully for concealed shipping damage. If unit is damaged or
incomplete, file claim with transportation company and
advise Bryant immediately.
II. STEP 2 — PROTECT UNIT FROM DAMAGE
To maintain warranty, unit must be protected against theft
and vandalism and stored indoors at all times.
III. STEP 3 — PROVIDE UNIT SUPPORT
Refer to Fig. 1 and 2 for unit dimensions and component
locations. Refer to Table 1 for unit sizes and weights.
Each unit requires the following field-supplied items:
4 — threaded suspension rods (
minimum)
4—washers
4 — locknuts
Install the 4 field-supplied rods by suspending them from a
suitable ceiling support. Locate rods to mate with 4 outside
corner rigging holes shown in Fig. 1 and 3.
The ceiling and ceiling supports of existing buildings may
require reinforcements ; follow all applicable codes.
3
/8-in.-16 SAE Grade 1
DIMENSIONS (ft-in.)
UNIT
502A
036 2-4
048 2-5 2-3 1-11
060 2-43/42-23/41-115/81-77/81-77/
ABCDE
3
/42-2 1- 53/41-2 1-1
5
/81-87/81-77/
8
8
LEGEND
Center of Gravity
Direction of Airflow
Fig. 1 — Dimensions
Table 1 — Physical Data
UNIT 502A 036 048 060
OPERATING WEIGHT (lb)
Base Unit, Evap/Condenser Section 480, 206/274 580, 250/330 590, 254/336
SHIPPING WEIGHT (lb)* 590 690 700
REFRIGERANT TYPE R-22
Operating Charge (lb)† 5.5 8.0 7.6
COMPRESSOR — TYPE Scroll
Quantity...Model (1)...ZR34 (1)...ZR49 (1)...ZR57
Oil (oz) 42 48 54
HPS Setting (psig)
Cutout 426 ± 7
Reset 320 ± 20
LPS Setting (psig)
Cutout 27 ± 4
Reset 67 ± 7
CONDENSATE DRAIN CONNECTION
Size (in.)...Type
CONDENSER FAN Centrifugal — Belt Drive
Nominal Cfm 1350 2250 2450
Maximum Rpm 1100 1500
Blower Size (in.) 12 x 6 12 x 9
Pulley Pitch Diameter (in.)
Blower 5.0 6.0 6.0
Motor (Variable) 2.4-3.4 1.9-2.9 2.4-3.4
Motor Hp
Motor Rpm 1725 1725 1725
EVAPORATOR AIR FAN (Standard) Centrifugal — Direct Drive
Nominal Cfm 1200 1600 2000
Max Rpm 1150 1050
Blower Size (in.) 10 x 6 10 x 6
Motor Hp (Rpm)
EVAPORATOR AIR FAN (Optional)
Nominal Cfm 1600 2000
Max Rpm 1300
Blower Size (in.) 10 x 8
Motor Hp 1
Motor Rpm 1725
Pulley Pitch Diameter (in.)
Blower 4.2
Motor (Variable) 2.4-3.4
CONDENSER COIL Copper Tubes — Aluminum Fins
Size (L x H) (in.) 40 x 16 40 x 22
Number of Rows...Fins/in. 4...17 4...13.6
EVAPORATOR COIL Copper Tubes — Aluminum Fins
Size (L x H) (in.) 34 x 16 34 x 22
Number of Rows...Fins/in. 4...15 4...14.4
INDOOR-AIR FILTERS Factory-Supplied Cleanable Type
Number...Size (in.)
INTERCONNECTING TUBING SIZE (in.)**
Hot Gas
Liquid
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. Refer to Fig. 5-7 for
charging charts.
LEGEND
3
/
4
1
/2 (1075)
Not
Available
1...14 x 34 x 1
1
/
2
3
/
8
**Use Type L copper only.
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.
3
/4...FPT
11
3
/4 (1050)
Centrifugal Belt Drive
1
/
2
1...21 x 34 x 1
1
/
2
3
/
8
1
/
2
1
/
2
3
/
8
—2—
CONTROL BOX ACCESS PANEL,
COMPRESSOR, LOW-PRESSURE AND
HIGH-PRESSURE SWITCHES AND
SERVICE PORT CONNECTION
ACCESS
JUNCTION BOX
CONDENSER
SIDE ACCESS
PANEL
FILTER DRIER AND
CAPILLARY TUBE ACCESS
FILTER
CONTROL BOX
FILTER
DRIER
UNIT WITH FILTER
REMOVED
CONDENSER MOTOR
AND BLOWER ACCESS-ALSO
PROVIDES ACCESS FOR
CLEANING CONDENSER COIL
EVAPORATOR MOTOR
AND BLOWER ACCESS-ALSO
PROVIDES ACCESS FOR
CLEANING EVAPORATOR
CONDENSER MOTOR AND
BLOWER ASSEMBLY
EVAPORATOR MOTOR
ACCESS DOORS
Fig. 2 — Component Locations
UNIT 502A
036 28.8 26.0
048 29.0 27.0
060 28.8 26.8
NOTE: Fasten threaded rods through holes in end frames as shown.
Use 2 rods on each side of unit for a total of 4.
CAUTION: All panels must be in place when rigging.
Fig. 3 — Rigging Details
—3—
CENTER OF GRAVITY
DIMENSIONS (in.)
AB
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