Horizontal Indoor Single-Package Cooling Units
with PURON® Refrigerant (R-410A)
Installation, Start-Up, and
Service Instructions
ROOMTOP
50AH024-096
®
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
Step 1 — Receive and Inspect Unit. . . . . . . . . . . . . . . 1
Step 2 — Protect Unit from Damage . . . . . . . . . . . . . . 1
Step 3 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 1
Step 4 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 8
Step 5 — Make Condensate Piping
Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 6 — Install Ductwork. . . . . . . . . . . . . . . . . . . . . . . . 8
Step 7 — Split Systems (Factory Option,
if Required). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 8 — Make Electrical Connections . . . . . . . . . . 10
• FIELD CONTROL WIRING
• THERMOSTAT WIRE
Step 9 — Adjust Fan Speed . . . . . . . . . . . . . . . . . . . . . 10
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17,18
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 coils and filters and replacing filters. All
other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe
precautions in the literature and on tags and labels attached to
unit.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguisher available.
WARNING
Disconnect all power to the unit before performing maintenance or service. Electrical shock and personal injury could
result.
NOTE: Ensure voltage on unit agrees with voltage listed on
the unit rating plate.
GENERAL
The 50AH024-096 units are single-package, indoor, horizontally mounted air conditioners of 2 to 8 tons capacity. The
50AH units are ASHRAE (American Society of Heating, Refrigerating and Air Conditioning Engineers) 90.1 compliant.
These units can be mounted as factory-shipped singlepackage units or can be separated and mounted as a split
system. If unit is split, the condensing section must be mounted
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 access panels located on the sides of the unit.
These panels may also be used for cleaning of condenser coils.
Unit side panels also 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 ductwork. Follow dimensional drawings carefully
for ductwork, piping locations, electrical wiring, and overall unit dimensions. Read all installation instructions before
starting installation.
The 50AH units are intended for indoor installation only.
Step 1 — Receive and Inspect Unit — Unpack and
check unit against shipping order. See Fig. 1 for model number
nomenclature. Inspect carefully for concealed shipping damage. If unit is damaged or incomplete, file claim with transpor-
tation company and advise Carrier immediately.
Step 2 — Protect Unit from Damage — To main-
tain warranty, unit must be protected against theft and vandalism and stored indoors at all times.
Step 3 — Provide Unit Support — Refer to Fig. 2-5
for unit dimensions. Refer to Table 1 for unit sizes and weights.
Each unit requires the following field-supplied items:
8 — threaded suspension rods (
minimum), 4 additional rods are needed if the unit
has a factory-installed air-side economizer
8—washers
8 — locknuts
Install the 8 field-supplied rods by suspending them from a
suitable ceiling support. Locate rods to mate with 8 outside corner rigging holes shown in Fig. 2-5. Unit center of gravity is
shown in Fig. 6.
The ceiling and ceiling supports of existing buildings may
require reinforcements; follow all applicable codes.
3
/8-in.-16 SAE Grade 1
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500057-01 Printed in U.S.A. Form 50AH-14SI Pg 1 5-10 Replaces: 50AH-12SI
Evaporator Configuration
Factory-Installed Options
50AH AC 048 5 – – – – 2 1 XX
50AH – Horizontal, Indoor
Single-Package Cooling Unit
Packaging
1 – Domestic
2 – Export
Voltage Description
5 – 208/230-3-60
6 – 460-3-60
Unit Size - Nominal Tons
024 –2
036 – 3
048 – 4
Compressor Options
AC – Air Cooled
060 –5
072 – 6
096 – 8
3 – 208/230-1-60
Condenser Configuration
Design Changes
2 – R-410A Original Design
Cabinet Type
S – Splittable*
– – Standard
Economizer and Hot Gas Options
A – Hot Gas Bypass†
B – Hot Gas Reheat†
– – None
C – Air-S
ide Economizer with Controls
E – Hot Gas Bypass and Air-Side Economizer†
F – Hot Gas Bypass, Air-Side Economizer, and
Hot Gas Reheat†
D – Hot Gas Bypass and Hot Gas Reheat†
G – Hot Gas Reheat and Air-Side Economizer†
B – Standard Motor with Alternate 2 Drive
A – Standard Motor with Alternate 1 Drive
– – Standard Motor with Standard Drive
E – Upgrade 1 Motor with Alternate 2 Drive
D – Upgrade 1 Motor with Alternate 1 Drive
C – Upgrade 1 Motor with St
andard Drive
H – Upgrade 3 Motor with Alternate 2 Drive
G – Upgrade 2 Motor with Alternate 2 Drive
F – Upgrade 2 Motor with Alternate 1 Drive
B – Standard Motor with Alternate 1 Drive
A – Standard Motor with Standard Drive, Flooded Condenser
– – Standard Motor with Standard Drive
E – Upgrade 1 Motor with Alternate 3 Drive
D – Upgrade 1 Motor with Alternate 2 Drive
C – Upgrade 1 Motor with Alternate 1 Drive
H – Upgrade 2 Motor with Alternate 3 Drive
G – Upgrade 2 Motor with Alternate 2 Drive
F – Upgra
de 2 Motor with Alternate1 Drive
J – Standard Motor with Alternate 1 Drive, Flooded Condenser
M – Upgrade 1 Motor with Alternate 3 Drive, Flooded Condenser
L – Upgrade 1 Motor with Alternate 2 Drive, Flooded Condenser
K – Upgrade 1 Motor with Alternate 1 Drive, Flooded Condenser
Q – Upgrade 2 Motor with Alternate 3 Drive, Flooded Condenser
P – Upgrade 2 Motor with Alternate 2 Drive, Flooded Condenser
N – Upgrade 2 Motor with Alternate1 Drive, Flooded Condenser
* Includes interconnecting kit and electrical box.
†Not available with splitable units.
a50-8546
Fig. 1 — Model Number Nomenclature
2
DETAIL A
CLEARANCE HOLE FOR
3/8" HANGING ROD
TYP 8 PLS
AIR
IN
COIL
ACCESS
FRONT
TOP
RIGHT
REAR LEFT
RETURN
AIR
SUPPLY
AIR
AIR
OUT
MOTOR
ACCESS
ELECT
BOX
ACCESS
BLOWER
ACCESS
EVAP
SECTION
COND
SECTION
ISOMETRIC VIEW
MOTOR
ACCESS
DETAIL "A"
ELECTRICAL
CONNECTIONS
TYP
CONDENSATE DRAIN
7/8" OD
FILTER
ACCESS
COMPRESSOR
ACCESS
QUICK
CONNECT
ACCESS
RA
LEFT
RIGHT
REAR
FRONT
26 IN. SERVICE
CLEARANCE
36 IN. SERVICE
CLEARANCE
31
90
6 7/16
13 5/8
34 3/4
1 3/8
9 5/16
12 3/8
60
24
3 3/4
3 13/16
33
2
28
64 1/2
6 1/8
18 3/4
1 3/4
16 1/8
48
42
2 1/4
3 1/2
62
1 15/16
38 1/8
3 7/8
44 1/8
1
1
1
A
B
C
DEG
FH
OSA
OPERATING WEIGHT DISTRIBUTION
UNIT
50AH
WEIGHT OF CORNER (lb)
ABCDEFGH
024 8711188 113 143 136 105 100
036 8711189 114 144 138 106 101
048 91 116 92 118 152 145 111 106
060 91 117 93 119 153 146 112 107
Fig. 2 — Unit Dimensions — 50AH024-060 Standard Units
NOTE: Dimensions are in inches.
a50-8547
LEGEND
OSA — Outside Supply Air
RA — Return Air
3
64 1/2
6 1/8
183/4
1 3/4
16 1/
8
1 1/2
3 13/16
1 15/16
44 1/8
3 7/8
38 1/8
6 1/16
24 3/4
38 1/2
5 15/16
3 1/4
1/4
5 7/
8
13 5/8
9 5/16
12 3/
8
6 7/16
2 1/4
5 7/8
12
Fig. 3 — Unit Dimensions — 50AH024-060 Units with Factory-Installed Air-Side Economizer
a50-8548
NOTES:
1. Dimensions are in inches.
2. Economizer weight is 180 lb.
LEGEND
OSA — Outside Supply Air
RA — Return Air
4
DETAIL A
CLEARANCE HOLE FOR
3/8" HANGING ROD
TYP 8 PLS
DETAIL "A"
AIR
IN
MOTOR
ACC
ELECT
BOX
ACCESS
COIL
ACCESS
COMPRESSOR
ACCESS
FILTER
ACCESS
CONDENSATE DRAIN
7/8" OD
FRONT
TOP
RIGHT
REAR LEFT
RETURN
AIR
SUPPLY
AIR
AIR
OUT
MOTOR
ACCESS
ELECT
BOX
ACCESS
BLOWER
ACCESS
QUICK
CONNECT
ACCESS
EVAP
SECTION
COND
SECTION
ELECTRICAL
CONNECTIONS
TYP
ISOMETRIC VIEW
21 7/16
22 1/8
18 15/16
10 7/8
32
112
25
3 5/8
39
1 1/4
16 1/16
6 7/16
18 3/4
6
70 1/2
29
653
2
2 1/4
3 1/2
47
65
72 1/2
1 15/16
43 1/8
3 7/8
61 1/8
75
26 IN. SERVICE
CLEARANCE
36 IN. SERVICE
CLEARANCE
36 IN. SERVICE
CLEARANCE
1
1
1
A
B
C
DEG
F
H
OSA
RA
REAR
RIGHT
LEFT
FRONT
OPERATING WEIGHT DISTRIBUTION
UNIT
50AH
WEIGHT OF CORNER (lb)
ABCDEFGH
072 125 128 149 152 126 128 188 192
096 126 129 149 153 139 142 208 212
NOTE: Dimensions are in inches.
a50-8549
Fig. 4 — Unit Dimensions — 50AH072,096 Standard Units
LEGEND
OSA — Outside Supply Air
RA — Return Air
5
13 7/16
16 1/16
6 7/16
18 3/4
6 5/8
70 1/2
5 7/8
22 1/8 21 7/16
18 15/16
10 7/8
3 1/4
5 15/16
1 1/2
72 1/2
1 15/16 61 1/8
3 7/8
43 1/8
6 1/16
42 1/2
29 3/4
12
NOTES:
1. Dimensions are in inches.
2. Economizer weight is 200 lbs.
a50-8550
Fig. 5 — Unit Dimensions — 50AH072,096 Units with Factory-Installed Air-Side Economizer
LEGEND
OSA — Outside Supply Air
RA — Return Air
6
Table 1 — Physical Data
Fig. 6 — Rigging Details
CENTER OF GRAVITY
NOTE: Fasten threaded rods through holes in end frames as shown.
Use 4 rods on each side of unit for a total of 8.
UNIT 50AH
DIMENSIONS (in.)
AB
024 29.0 25.6
036 28.8 26.0
048 29.0 27.0
060 28.8 26.8
072 59.3 31.2
096 60.0 31.5
CAUTION
All panels must be in place when rigging.
UNIT 50AH 024 036 048
OPERATING WEIGHT (lb)
Base Unit 903 910 952
Evaporator/Condenser Sections 399/484401/489 417/515
SHIPPING WEIGHT (lb)* 1036 1043 1085
REFRIGERANT TYPE R-410A
Operating Charge (lb-oz)† 4-5 4-5 8-8
COMPRESSOR — TYPE Scroll
Quantity...Model 1...ZP20K5E 1...ZP31K5E 1...ZP38K5E
Oil (oz) 25 25 42
HPS Setting (psig)
Cutout 650 ± 7
Reset Manual Reset
LPS Setting (psig)
Cutout 75 ± 7
Reset 100 ± 7
CONDENSATE DRAIN CONNECTION
Size (in.)...Type
CONDENSER COIL Copper Tubes — Aluminum Fins
Size (L x H) (in.) 40 x 30 40 x 30 90 x 30
Number of Rows...Fins/in. 4...14 4...14 2...12
CONDENSER FAN Centrifugal — Belt Drive
Nominal Cfm 1700 2000 2500
Blower Size (in.) 15 x15 15 x 15 15 x 15
Motor Hp (Rpm)
Standard Motor 0.33 (1725) 0.33 (1725)
Upgrade 1 Motor ——
Upgrade 2 Motor ——
EVAPORATOR COIL Copper Tubes — Aluminum Fins
Size (L x H) (in.) 32 x 16 32 x 16 32 x 26
Number of Rows...Fins/in. 3...12 3...12 3...14
EVAPORATOR AIR FAN Centrifugal — Belt Drive
Nominal Cfm 800 1200 1600
Blower Size (in.) 12 x 9 12 x 9 12 x 9
Motor Hp (Rpm)
Standard Motor 0.25 (1725) 0.33 (1725)
Upgrade 1 Motor 0.33 (1725) 0.50 (1725)
Upgrade 2 Motor 0.50 (1725) 0.75 (1725)
Upgrade 3 Motor — 1.00 (1725)
INDOOR-AIR FILTERS Factory-Supplied Disposable Type
Number...Size (in.) 2...18 x 24 x 1 2...18 x 24 x 1 2...18 x 24 x 1
INTERCONNECTING TUBING SIZE
Suction (Qty...in.) 1...
Liquid (Qty...in.)
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.
5
/
8
3
/
1...
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 Carrier representative for more
information. For additional piping information, refer to Carrier System
Design Manual, Part 3.
7
/8...OD
0.33 (1725)
0.50 (1725)
0.75 (1725)
0.33 (1725)
0.50 (1725)
0.75 (1725)
1.00 (1725)
1...5/
1...3/
8
8
1...7/
1...3/
8
8
7
Table 1 — Physical Data (cont)
UNIT 50AH 060 072 096
OPERATING WEIGHT (lb)
Base Unit 960 1214 1283
Evaporator/Condenser Sections 421/519 554/634 556/701
SHIPPING WEIGHT (lb)* 1093 1647 1716
REFRIGERANT TYPE R-410A
Operating Charge (lb-oz)† 8-8 6-6 6-6
COMPRESSOR — TYPE Scroll
Quantity...Model 1...ZPKP51K5E 2...ZP31K5E 2...ZP38K5E
Oil (oz) 42 25 42
HPS Setting (psig)
Cutout 650 ± 7
Reset Manual Reset
LPS Setting (psig)
Cutout 75 ± 7
Reset 100 ± 7
CONDENSATE DRAIN CONNECTION
Size (in.)...Type
CONDENSER COIL Copper Tubes — Aluminum Fins
Size (L x H) (in.) 90 x 30 40 x 30 (2 coils) 40 x 30 (2 coils)
Number of Rows...Fins/in. 2...12 2...20 2...20
CONDENSER FAN Centrifugal — Belt Drive
Nominal Cfm 3000 5200 6400
Blower Size (in.) 15 x 15 18 x 18 18 x 18
Motor Hp (Rpm)
Standard Motor 0.33 (1725) 1.00 (1725)
Upgrade 1 Motor 0.50 (1725) 1.50 (1725)
Upgrade 2 Motor 0.75 (1725) —
EVAPORATOR COIL Copper Tubes — Aluminum Fins
Size (L x H) (in.) 32 x 26 46 x 28 46 x 28
Number of Rows...Fins/in. 3...14 3...14 3...14
EVAPORATOR AIR FAN Centrifugal — Belt Drive
Nominal Cfm 2000 2400 3200
Blower Size (in.) 12 x 9 15 x 15 15 x 15
Motor Hp (Rpm)
Standard Motor 0.33 (1725) 0.50 (1725)
Upgrade 1 Motor 0.50 (1725) 0.75 (1725)
Upgrade 2 Motor 0.75 (1725) 1.00 (1725)
Upgrade 3 Motor 1.00 (1725) 1.50 (1725)
INDOOR-AIR FILTERS Factory-Supplied Disposable Type
Number...Size (in.) 2...18 x 24 x 1 2...20 x 25 x 1 2...20 x 25 x 1
INTERCONNECTING TUBING SIZE
Suction (Qty...in.) 1...
Liquid (Qty...in.)
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.
7
/
8
3
/
1...
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 Carrier representative for more
information. For additional piping information, refer to Carrier System
Design Manual, Part 3.
7
/8...OD
1...5/
1...3/
1.50 (1725)
2.00 (1725)
3.00 (1725)
0.75 (1725)
1.00 (1725)
1.50 (1725)
2.00 (1725)
8
8
1...7/
1...7/
8
8
Step 4 — Rig and Place Unit — Move and store unit
in horizontal position. Provide space around unit for service,
filter access, ductwork, and overhead clearance as indicated in
Fig. 2-5.
Using suitable hydraulic lift source, raise unit up to meet
bottom of the 8 threaded rods suspended from ceiling (12 rods
for units with air-side economizer). Center unit so that the 8 or
12 threaded rods can be easily inserted into the factory-drilled
holes at each end. Refer to Fig. 6 for rigging details.
Apply washers and locknuts on ends of each of the 8 or 12
rods.
Tighten locknuts sufficiently so that unit weight is support-
ed entirely by the 8 or 12 rods. Level unit within the space by
adjusting locknuts.
IMPORTANT: Unit must be level to operate properly.
NOTE: For split systems, 8 (or 12) suspension rods are
required (4 for each section and 4 for economizer if required).
Refer to Splitting Systems section below.
Step 5 — Make Condensate Piping Connections —
nection is provided for the evaporator section.
One 7/8-in. OD pipe thread condensate drain con-
Step 6 — Install Ductwork — Use flexible ductwork
to attach duct to unit and to help control transmission of vibrations to building structures. Attach ductwork to the return and
supply ends of both coils.
If unit is located with condenser close to outside of building,
install a field-supplied rainhood. Hood intake dimensions
should be same as condenser return-air dimensions. In addition, install a triple-layer bird screen over rainhood intake to
eliminate possibility of insects, birds, water, or debris from
entering unit. Ensure hood and/or louvers are installed correctly to avoid condenser air recirculation.
Step 7 — Split Systems (Factory Option, if
Required) — The Roomtop
2 sections, if desired, with condensing section mounted
remotely horizontally. The unit must be ordered with the
“Splittable” cabinet type as shown in the unit model number
nomenclature. See Fig. 1. All splittable units come with the
interconnecting tubing kit.
Sections installed in the same horizontal plane may be separated by up to 50 equivalent ft of tubing. Use type L copper or
better.
8
®
50AH units may be split into
Condensing section must be located in same plane as, or
SELF-SEALING
COUPLING
(FEMALE HALF)
SELF-SEALING
COUPLING
(MALE HALF)
SELF-SEALING
FLANGE
SCREWS
Fig. 7 — Self Sealing Coupling
a50-8551
A — Male self-sealing fittings
B — Refrigerant piping between sections
C — Female self-sealing fittings
D — Schrader fittings
Fig. 8 — Tubing Installation
a50-8552
above, evaporator section to maintain the liquid refrigerant seal
at the expansion device. This permits expansion device to feed
liquid refrigerant to evaporator coil properly. To split sections
(some of the following steps may be eliminated depending on
particular application):
1. Disconnect all electrical power to unit.
2. Remove the 10 size 10 drive screws that hold on the top
tie strap.
3. Remove the 8 size
3
/8-in. drive bolts that hold on each
side angle.
4. Control panel access panels are held on with 2 size 10
drive screws for each panel. A standard 50AH024-060
unit has one control panel located in the evaporator section. A standard 50AH072 or 096 unit has a control panel
in both the evaporator and condenser sections.
5. Units have resealable fittings. Do not cut refrigerant piping. See Interconnecting Refrigerant Tubing section below for procedure on installing tubing.
6. Install evaporator and condensing sections in desired
locations.
7. Use sufficient length of refrigerant piping to reconnect
piping cut in previous step. Refer to Carrier System
Design Manual, Part 3, for additional piping data.
8. Recharge unit with R-410A. See Refrigerant Charge section on page 18 for more information.
After splitting sections, additional refrigerant must be added
to system to ensure proper refrigerant charge. The amount of
refrigerant to be added depends on length of tubing added to
system and operating temperatures of system. Refer to Carrier
System Design Manual, Chapter 3. Allow unit to operate at
least 10 minutes before adjusting refrigerant charge.
Since standard roomtop unit has negligible line losses, splitting the system can increase line loss and decrease system
capacity. Capacity reduction can be determined by referring to
Carrier System Design Manual.
INTERCONNECTING REFRIGERANT TUBING — The
interconnecting tubing kit comes with all factory-optional splittable units. After the separated sections have been installed, the
interconnecting tubing can be run, using the self-sealing couplings supplied in the interconnect tubing kit (see Fig. 7 and 8).
Perform the following procedure:
1. For condensing section, hand thread the female halves of
the self-sealing couplings (supplied with the interconnect
tubing kit) onto the male couplings (factory supplied and
installed on the condensing section). Turn union nut approximately 1 to 1
1
/2 turns. This is to make sure that the
interconnecting tubing will be routed and brazed with the
self-sealing couplings in their final proper location, so
that there will be no difficulty when the final coupling assembly is made.
2. For evaporator section, hand thread the male halves of the
self-sealing couplings (supplied with the interconnect
tubing kit) onto the female couplings (factory supplied
and installed on the evaporating section). Turn union nut
approximately 1 to 1
1
/2 turns. This is to make sure that the
interconnecting tubing will be routed and brazed with the
self-sealing couplings in their final proper location, so
that there will be no difficulty when the final coupling assembly is made.
3. Run the interconnecting tubing required.
NOTE: Installations may be made with up to 50 ft equiv-
alent line lengths by installing the recommended tube sizes and adding the necessary refrigerant. For equivalent
line lengths greater than 50 ft, contact Carrier for line sizing and additional accesories required.
IMPORTANT: On units with more than one refrigerant circuit, be careful not to intermix lines of the
various circuits. If the connections were labeled
before disconnecting the couplings, this should not
be a problem. Half couplings may be removed to
make brazing to the interconnecting tubing more
convenient.
D
B
B
C
D
C
A
CONDENSING
SECTION
A
C
EVAPORATOR
SECTION
C
D
A
D
A
For dual circuits, 2 kits are supplied. It is recommended that
some refrigerant oil be placed on the coupling threads to facilitate threading.
CAUTION
When brazing tubing to the self-sealing couplings, be sure
to use a wet rag, running water bath or chill blocks on the
quick-connects to prevent overheating the valves and damaging the seals
4. The interconnect tubing kit contains a sufficient number
of Schrader access valves to permit installation of one in
each end of both the liquid and suction lines of the fieldsupplied tubing. Each interconnecting line (suction, liquid, hot gas) must have one of the supplied Schrader access fittings installed into the field-supplied tubing, however, for short lengths of tubing, only one Schrader in
each line is necessary. Install the Schrader valve fittings
into the tubing before brazing the couplings onto the ends
9
.
of the tubing. Use a
1
/4-in. hole to mount the valve. Clean
and debur the tubing before doing any brazing to ensure
that no chips or debris are left in the refrigerant circuit.
Remove the Schrader valve cap and core before doing
any brazing.
5. After brazing the tubing to the self-sealing coupling
halves, evacuate each line to 500 microns. Check to make
sure that each line holds a vacuum after removal of the
vacuum pump (indicating no leaks). Add the appropriate
charge of R-410A refrigerant using the Schrader valves.
Refasten male halves to outer back panel of evaporator
section with flanges and screws (if they were removed for
brazing to tubing). Wipe off coupling seals and threaded
surfaces with a clean cloth to prevent the inclusion of dirt
or foreign material into the system. Lubricate rubber seal
and metal seal in the male halves with refrigeration oil.
Thread coupling halves together by hand to ensure proper
mating of threads. Continue to handthread each half-coupling to its mating half until resistance is felt (approximately 1
1
/2 to 13/4 turns). Complete the connection of the
mating half-couplings with a wrench. The suction line
couplings (size 12) will be totally engaged after an addi-
1
tional 5
will be totally engaged after an additional 4
/2 to 53/4 turns. The liquid line couplings (size 8)
1
/2 to 43/
turns. Use a backup wrench to prevent the couplings from
twisting.
6. Refrigerant piping must be insulated in accordance with
local codes and/or applicable ASHRAE standards. Insulation exposed to weather must be suitable for outdoor
use. Provide protection from water and shielding from solar radiation as necessary.
7. Add refrigerant to the system to compensate for the additional interconnecting tubing. The suction line should be
pitched downward to the compressor, sloping approxi-
1
mately
/4-in. every 10 ft to facilitate oil return. P-traps
(field supplied) are required for all suction line risers every 15 ft. When the evaporator is above the condensing
section, an inverted P-trap should be incorporated as
close as possible to the evaporator (this minimizes floodback/oil slugging during the off cycle). If the condensing
Table 2A — Electrical Data — Standard Evaporator Motor with Standard Condenser Motor
section is more than 50 ft above the evaporator, consult
Carrier for specific refrigeration components.
Step 8 — Make Electrical Connections — Con-
nect power wiring to junction box located on unit side near
control box access panel. All wiring must comply
with National Electrical Code (NEC) and all local code
requirements.
Operating voltage to compressor must be within voltage
range as indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2% and current
must be balanced within 10%. Contact local power company
for correction of improper voltage or phase imbalance. Unit
failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate
any applicable Carrier warranty.
Install a fused disconnect per NEC. Refer to unit nameplate
and Tables 2A-2L for fuse sizes and wire amperages for all
units.
FIELD CONTROL WIRING — Install a Carrier-approved
accessory thermostat assembly according to installation
instructions provided by thermostat manufacturer. Locate
4
thermostat assembly on a solid wall in the conditioned space
away from drafts to sense average room temperature.
Using thermostat cable or equivalent single leads of no. 18
AWG (American Wire Gage) colored wire, route cable or wire
from the subbase terminals, up and through connector on unit
side (below power lead junction box) and connect to low-voltage terminal block inside the control box.
THERMOSTAT WIRE — Use 18 gage for 0 to 50-ft long
wires and 16 gage for 51 to 75-ft wire lengths.
Step 9 — Adjust Fan Speed — Adjust fan speed to
meet jobsite conditions. Refer to Tables 3 and 4 to determine
fan speed settings. See Service section of this document for
instructions to adjust fan speed.
The evaporator and condenser fan motors on all units are
belt drive.
VOLTAGE
UNIT
50AH
024 208/230-1 187 254 1 13.5 58.0
036
048
060
072*
096*
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
*Unit has two compressors.
V-PH
(60 Hz)
208/230-1 187 254
208/230-3 187 254 10.4 73.0
460-3 414 508 5.8 38.0
208/230-1 187 254
208/230-3 187 254 13.6 83.1
460-3 414 508 6.1 41.0
208/230-1 187 254
208/230-3 187 254 16.0 110.0
460-3 414 508 7.8 52.0
208/230-1 187 254
208/230-3 187 254 10.4 73.0
460-3 414 508 5.8 38.0
208/230-1 187 254
208/230-3 187 254 13.6 83.1
460-3 414 508 6.1 41.0
LEGEND
RANGE
Min Max QTY RLA LRA Hp FLA Hp FLA
COMPRESSOR
16.7 79.0
1
19.9 109.0
1
26.4 134
1
16.7 79.0
2
19.9 109.0
2
FAN MOTORS
Evaporator
(Standard)
1
/
1.25
4
1
/
3
1
/
3
1
/
3
1
/
3
1
/
3
1
/
3
1
/
3
1
/
3
1
/
3
1
/
2
1
/
2
1
/
2
3
/
4
3
/
4
3
/
4
Condenser
(Standard)
1
/
1.7 19.8 35
3
1.7
1.3
0.7
1.7
1.3
0.7
1.7
1.3
0.7
2.5 1 4.2 44.3 60
1.8 13.228.4 40
0.9 1 1.6 15.6 20
3.2 1 1/
2.4 1 1/
1.2 1 1/
1
/
1.7 24.3 40
3
1
/
1.3 15.6 25
3
1
/
0.7 8.6 15
3
1
/
1.7 28.3 50
3
1
/
1.3 19.6 35
3
1
/
0.7 8.9 15
3
1
/
1.7 36.4 65
3
1
/
1.3 22.6 40
3
1
/
0.7 11.1 20
3
6.5 54.5 75
2
4.8 37.8 50
2
2.4 17.3 25
2
POWER SUPPLY
Min Ckt
Amps
MOCP
Amps
10
Table 2B — Electrical Data — Upgrade 1 Evaporator Motor with Standard Condenser Motor
UNIT
50AH
V-PH
(60 Hz)
VOLTAGE
RANGE
COMPRESSOR
Min Max QTY RLA LRA Hp FLA Hp FLA
024 208/230-1 187 254 1 13.5 58.0
036
048
060
072*
096*
208/230-1 187 254
208/230-3 187 254 10.4 73.0
460-3 414 508 5.8 38.0
1
208/230-1 187 254
208/230-3 187 254 13.6 83.1
460-3 414 508 6.1 41.0
1
208/230-1 187 254
208/230-3 187 254 16.0 110.0
460-3 414 508 7.8 52.0
1
208/230-1 187 254
208/230-3 187 254 10.4 73.0
460-3 414 508 5.8 38.0
2
208/230-1 187 254
208/230-3 187 254 13.6 83.1 1 3.2 1
460-3 414 508 6.1 41.0 1 1.6 1
2
16.7 79.0
19.9 109.0
26.4 134.0
16.7 79.0
19.9 109.0 1 4.2 1
Table 2C — Electrical Data — Upgrade 2 Evaporator Motor with Standard Condenser Motor
VOLTAGE
UNIT
50AH
V-PH
(60 Hz)
RANGE
Min Max QTY RLA LRA Hp FLA Hp FLA
024 208/230-1 187 254 1 13.5 58.0
036
048
060
072*
096*
208/230-1 187 254
208/230-3 187 254 10.4 73.0
460-3 414 508 5.8 38.0
208/230-1 187 254
208/230-3 187 254 13.6 83.1
460-3 414 508 6.1 41.0
208/230-1 187 254
208/230-3 187 254 16.0 110.0
460-3 414 508 7.8 52.0
208/230-1 187 254
208/230-3 187 254 10.4 73.0 1 3.2 1 3.2 29.8 40
460-3 414 508 5.8 38.0 1 1.6 1 1.6 16.3 20
208/230-1 187 254
208/230-3 187 254 13.6 83.1 11/
460-3 414 508 6.1 41.0 11/
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
*Unit has two compressors.
COMPRESSOR
1
1
1
2
2
16.7 79.0
19.9 109.0
26.4 134.0
16.7 79.0 1 4.2 1 4.2 46.0 60
19.9 109.0 1
FAN MOTORS
Evaporator
(Upgrade 1)
1
/
1
/
1
/
1
/
1
/
1
/
1
/
1
/
1
/
1
/
3
/
3
/
3
/
1.7
3
2.5
2
1.8
2
0.9
2
2.5
2
1.8
2
0.9
2
2.5
2
1.8
2
0.9
2
3.2 1 4.2 45.0 60
4
2.4 1 3.2 29.0 40
4
1.2 1 1.6 15.9 20
4
FAN MOTORS
Evaporator
(Upgrade 2)
1
/
3
/
3
/
3
/
3
/
3
/
3
/
3
/
3
/
3
/
1
2
4
4
4
4
4
4
4
4
4
/
2
2
2
2.5
3.2
2.4
1.2
3.2
2.4
1.2
3.2
2.4
1.2
6.5 1 1/
4.8 1 1/
2.4 1 1/
Condenser
(Standard)
1
/
1.7 20.3 35
3
1
/
1.7 25.1 40
3
1
/
1.3 16.1 25
3
1
/
0.7 8.8 15
3
1
/
1.7 29.1 50
3
1
/
1.3 20.1 35
3
1
/
0.7 9.2 15
3
1
/
1.7 37.2 65
3
1
/
1.3 23.1 40
3
1
/
0.7 11.3 20
3
1
/
6.5 55.5 75
2
1
/
4.8 38.6 50
2
1
/
2.4 17.7 25
2
Condenser
(Standard)
1
/
1.7 21.1 35
3
1
/
1.7 25.8 40
3
1
/
1.3 16.7 25
3
1
/
0.7 9.1 15
3
1
/
1.7 29.8 50
3
1
/
1.3 20.7 35
3
1
/
0.7 9.5 15
3
1
/
1.7 37.9 65
3
1
/
1.3 23.7 40
3
1
/
0.7 11.6 20
3
6.5 57.880
2
4.8 40.2 55
2
2.4 18.5 25
2
POWER SUPPLY
Min Ckt
Amps
MOCP
Amps
POWER SUPPLY
Min Ckt
Amps
MOCP
Amps
11
Table 2D — Electrical Data — Upgrade 3 Evaporator Motor with Standard Condenser Motor
FAN MOTORS
Evaporator
(Upgrade 3)
Condenser
(Standard)
POWER SUPPLY
Min Ckt
Amps
UNIT
50AH
V-PH
(60 Hz)
VOLTAGE
RANGE
COMPRESSOR
Min Max QTY RLA LRA Hp FLA Hp FLA
024 208/230-1 187 254 1 N/A N/A N/A N/A N/A N/A N/A N/A
1
/
036
048
060
072*
096*
208/230-1 187 254
208/230-3 187 254 10.4 73.0 1 2.4
460-3 414 508 5.8 38.0 1 1.2
1
208/230-1 187 254
208/230-3 187 254 13.6 83.1 1 2.4
460-3 414 508 6.1 41.0 1 1.2
1
208/230-1 187 254
208/230-3 187 254 16.0 110.0 1 2.4
460-3 414 508 7.8 52.0 1 1.2
1
208/230-1 187 254
208/230-3 187 254 10.4 73.0 1
460-3 414 508 5.8 38.0 1
2
208/230-1 187 254
208/230-3 187 254 13.6 83.1 2 6.0 1
460-3 414 508 6.1 41.0 2 2.9 1
2
16.7 79.0 1 3.2
19.9 109.0 1 3.2
26.4 134.0 1 3.2
1
/
16.7 79.0 1
6.5 1 4.2 48.3 65
2
1
/
4.8 1 3.2 31.4 40
2
1
/
2.4 1 1.6 17.1 25
2
N/A N/A N/A N/A N/A N/A N/A N/A
1
1
1
1
1
1
1
1
1.7 25.8 40
3
/
1.3 16.7 25
3
/
0.7 9.1 15
3
/
1.7 29.8 50
3
/
1.3 20.7 35
3
/
0.7 9.5 15
3
/
1.7 37.9 65
3
/
1.3 23.7 40
3
/
0.7 11.6 20
3
1
/
4.8 41.4 55
2
1
/
2.4 19.0 25
2
Table 2E — Electrical Data — Standard Evaporator Motor with Upgrade 1 Condenser Motor
FAN MOTORS
Evaporator
(Standard)
1
/
3
1
/
3
1
/
3
1
/
3
1
/
3
1
/
3
1
/
2
1
/
2
1
/
2
3
/
4
3
/
4
Condenser
(Upgrade 1)
1.7
1.3
0.7
1.7
1.3
0.7
2.5 1 1/
1.8 1 1/
1
1
1
1
1
1
0.9 1 1/
/
2.5 29.1 50
2
/
1.8 20.1 35
2
/
0.9 9.2 15
2
/
2.5 37.2 65
2
/
1.8 23.1 40
2
/
0.9 11.3 20
2
6.5 46.6 65
2
4.8 30.0 40
2
2.4 16.4 20
2
POWER SUPPLY
Min Ckt
Amps
2.4 2 6.0 39.0 55
1.2 2 2.9 17.8 25
UNIT
50AH
V-PH
(60 Hz)
VOLTAGE
RANGE
COMPRESSOR
Min Max QTY RLA LRA Hp FLA Hp FLA
024 208/230-1 187 254 1 N/A N/A N/A N/A N/A N/A N/A N/A
036
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
1
N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
048
208/230-1 187 254
208/230-3 187 254 13.6 83.1
1
19.9 109.0
460-3 414 508 6.1 41.0
060
208/230-1 187 254
208/230-3 187 254 16.0 110.0
1
26.4 134.0
460-3 414 508 7.8 52.0
072*
208/230-1 187 254
208/230-3 187 254 10.4 73.0
2
16.7 79.0
460-3 414 508 5.8 38.0
096*
208/230-1 187 254
208/230-3 187 254 13.6 83.1
2
N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 6.1 41.0
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
*Unit has two compressors.
MOCP
Amps
MOCP
Amps
12
Table 2F — Electrical Data — Upgrade 1 Evaporator Motor with Upgrade 1 Condenser Motor
FAN MOTORS
Evaporator
(Upgrade 1)
Condenser
(Upgrade 1)
POWER SUPPLY
Min Ckt
Amps
UNIT
50AH
V-PH
(60 Hz)
VOLTAGE
RANGE
COMPRESSOR
Min Max QTY RLA LRA Hp FLA Hp FLA
024 208/230-1 187 254 1 N/A N/A N/A N/A N/A N/A N/A N/A
036
048
060
072*
096*
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
1
208/230-1 187 254
208/230-3 187 254 13.6 83.1
460-3 414 508 6.1 41.0
1
208/230-1 187 254
208/230-3 187 254 16.0 110.0
460-3 414 508 7.8 52.0
1
208/230-1 187 254
208/230-3 187 254 10.4 73.0
460-3 414 508 5.8 38.0
2
208/230-1 187 254
208/230-3 187 254 13.6 83.1 1 3.2 2 6.0 39.8 55
460-3 414 508 6.1 41.0 1 1.6 2 2.9 18.2 25
2
N/A N/A N/A N/A N/A N/A N/A N/A
19.9 109.0
26.4 134.0
16.7 79.0
1
/
1
/
1
/
1
/
1
/
1
/
3
/
3
/
3
/
2
2
2
2
2
2
4
4
4
2.5
1.8
0.9
2.5
1.8
0.9
3.2 1 1/
2.4 1 1/
1.2 1 1/
1
/
2.5 29.9 50
2
1
/
1.8 20.6 35
2
1
/
0.9 9.4 15
2
1
/
2.5 38.0 65
2
1
/
1.8 23.6 40
2
1
/
0.9 11.6 20
2
6.5 47.3 65
2
4.8 30.6 40
2
2.4 16.7 20
2
N/A N/A N/A N/A N/A N/A N/A N/A
Table 2G — Electrical Data — Upgrade 2 Evaporator Motor with Upgrade 1 Condenser Motor
FAN MOTORS
Evaporator
(Upgrade 2)
/
/
/
/
/
/
3.2
4
2.4
4
1.2
4
3.2
4
2.4
4
1.2
4
1
/
4.8 2 6.0 41.4 55
2
1
/
2.4 2 2.9 19.0 25
2
Condenser
(Upgrade 1)
1
/
2.5 30.6 50
2
1
/
1.8 21.2 35
2
1
/
0.9 9.7 15
2
1
/
2.5 38.7 65
2
1
/
1.8 24.2 40
2
1
/
0.9 11.9 20
2
1
/
6.5 48.3 65
2
4.8 31.4 40
2
1
/
2.4 17.1 25
2
POWER SUPPLY
Min Ckt
Amps
UNIT
50AH
V-PH
(60 Hz)
VOLTAGE
RANGE
COMPRESSOR
Min Max QTY RLA LRA Hp FLA Hp FLA
024 208/230-1 187 254 1 N/A N/A N/A N/A N/A N/A N/A N/A
036
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
1
N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
048
060
072*
208/230-1 187 254
208/230-3 187 254 13.6 83.1
1
19.9 109.0
460-3 414 508 6.1 41.0
208/230-1 187 254
208/230-3 187 254 16.0 110.0
1
26.4 134.0
460-3 414 508 7.8 52.0
208/230-1 187 254
208/230-3 187 254 10.4 73.0 1 3.2 1 1/
2
16.7 79.0 1 4.2 1
3
3
3
3
3
3
460-3 414 508 5.8 38.0 1 1.6 1
096*
208/230-1 187 254
208/230-3 187 254 13.6 83.1 1
2
N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 6.1 41.0 1
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
*Unit has two compressors.
MOCP
Amps
MOCP
Amps
13
Table 2H — Electrical Data — Upgrade 3 Evaporator Motor with Upgrade 1 Condenser Motor
FAN MOTORS
Evaporator
(Upgrade 3)
Condenser
(Upgrade 1)
POWER SUPPLY
Min Ckt
Amps
UNIT
50AH
V-PH
(60 Hz)
VOLTAGE
RANGE
COMPRESSOR
Min Max QTY RLA LRA Hp FLA Hp FLA
024 208/230-1 187 254 1 N/A N/A N/A N/A N/A N/A N/A N/A
036
048
060
072*
096*
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
1
208/230-1 187 254
208/230-3 187 254 13.6 83.1 1 2.4
460-3 414 508 6.1 41.0 1 1.2
1
208/230-1 187 254
208/230-3 187 254 16.0 110.0 1 2.4
460-3 414 508 7.8 52.0 1 1.2
1
208/230-1 187 254
208/230-3 187 254 10.4 73.0 1
460-3 414 508 5.8 38.0 1
2
208/230-1 187 254
208/230-3 187 254 13.6 83.1 2 6.0 2 6.0 42.6 55
460-3 414 508 6.1 41.0 2 2.9 2 2.9 19.5 25
2
N/A N/A N/A N/A N/A N/A N/A N/A
19.9 109.0 1 3.2
26.4 134.0 1 3.2
1
/
16.7 79.0 1
2
1
/
2
1
/
2
6.5 1 1/
4.8 1 1/
2.4 1 1/
1
/
2.5 30.6 50
2
1
/
1.8 21.2 35
2
1
/
0.9 9.7 15
2
1
/
2.5 38.7 65
2
1
/
1.8 24.2 40
2
1
/
0.9 11.9 20
2
6.5 50.6 65
2
4.8 33.0 45
2
2.4 17.9 25
2
N/A N/A N/A N/A N/A N/A N/A N/A
Table 2I — Electrical Data — Standard Evaporator Motor with Upgrade 2 Condenser Motor
FAN MOTORS
Evaporator
(Standard)
1
/
3
1
/
3
1
/
3
1
/
3
1
/
3
1
/
3
3
/
4
3
/
4
POWER SUPPLY
Min Ckt
Amps
1.7
1.3
0.7
1.7
1.3
0.7
Condenser
(Upgrade 2)
3
/
3.2 29.8 50
4
3
/
2.4 20.7 35
4
3
/
1.2 9.5 15
4
3
/
3.2 37.9 65
4
3
/
2.4 23.7 40
4
3
/
1.2 11.6 20
4
2.4 3 8.4 41.4 55
1.2 3 4.0 18.9 25
UNIT
50AH
V-PH
(60 Hz)
VOLTAGE
RANGE
COMPRESSOR
Min Max QTY RLA LRA Hp FLA Hp FLA
024 208/230-1 187 254 1 N/A N/A N/A N/A N/A N/A N/A N/A
036
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
1
N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
048
208/230-1 187 254
208/230-3 187 254 13.6 83.1
1
19.9 109.0
460-3 414 508 6.1 41.0
060
208/230-1 187 254
208/230-3 187 254 16.0 110.0
1
26.4 134.0
460-3 414 508 7.8 52.0
072*
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
2
N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
096*
208/230-1 187 254
208/230-3 187 254 13.6 83.1
2
N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 6.1 41.0
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
*Unit has two compressors.
MOCP
Amps
MOCP
Amps
14
Table 2J — Electrical Data — Upgrade 1 Evaporator Motor with Upgrade 2 Condenser Motor
FAN MOTORS
Evaporator
(Upgrade 1)
Condenser
(Upgrade 2)
POWER SUPPLY
Min Ckt
Amps
UNIT
50AH
V-PH
(60 Hz)
VOLTAGE
RANGE
COMPRESSOR
Min Max QTY RLA LRA Hp FLA Hp FLA
024 208/230-1 187 254 1 N/A N/A N/A N/A N/A N/A N/A N/A
036
048
060
072*
096*
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
1
208/230-1 187 254
208/230-3 187 254 13.6 83.1
460-3 414 508 6.1 41.0
1
208/230-1 187 254
208/230-3 187 254 16.0 110.0
460-3 414 508 7.8 52.0
1
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
2
208/230-1 187 254
208/230-3 187 254 13.6 83.1 1 3.2 3 8.4 42.2 55
460-3 414 508 6.1 41.0 1 1.6 3 4.0 19.3 25
2
N/A N/A N/A N/A N/A N/A N/A N/A
19.9 109.0
26.4 134.0
1
/
1
/
1
/
1
/
1
/
1
/
2.5
2
1.8
2
0.9
2
2.5
2
1.8
2
0.9
2
3
/
3.2 30.6 50
4
3
/
2.4 21.2 35
4
3
/
1.2 9.7 15
4
3
/
3.2 38.7 65
4
3
/
2.4 24.2 40
4
3
/
1.2 11.9 20
4
N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A
Table 2K — Electrical Data — Upgrade 2 Evaporator Motor with Upgrade 2 Condenser Motor
FAN MOTORS
Evaporator
(Upgrade 2)
/
/
/
/
/
/
3.2
4
2.4
4
1.2
4
3.2
4
2.4
4
1.2
4
1
/
4.8 3 8.4 43.8 55
2
1
/
2.4 3 4.0 20.1 25
2
Condenser
(Upgrade 2)
3
/
3.2 31.3 50
4
3
/
2.4 21.8 35
4
3
/
1.2 10.0 15
4
3
/
3.2 39.4 65
4
3
/
2.4 24.8 40
4
3
/
1.2 12.2 20
4
POWER SUPPLY
Min Ckt
Amps
UNIT
50AH
V-PH
(60 Hz)
VOLTAGE
RANGE
COMPRESSOR
Min Max QTY RLA LRA Hp FLA Hp FLA
024 208/230-1 187 254 1 N/A N/A N/A N/A N/A N/A N/A N/A
036
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
1
N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
048
060
072*
208/230-1 187 254
208/230-3 187 254 13.6 83.1
1
19.9 109.0
460-3 414 508 6.1 41.0
208/230-1 187 254
208/230-3 187 254 16.0 110.0
1
26.4 134.0
460-3 414 508 7.8 52.0
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
2
N/A N/A N/A N/A N/A N/A N/A N/A
3
3
3
3
3
3
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
096*
208/230-1 187 254
208/230-3 187 254 13.6 83.1 1
2
N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 6.1 41.0 1
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
*Unit has two compressors.
MOCP
Amps
MOCP
Amps
15
Table 2L — Electrical Data — Upgrade 3 Evaporator Motor with Upgrade 2 Condenser Motor
FAN MOTORS
Evaporator
(Upgrade 3)
Condenser
(Upgrade 2)
POWER SUPPLY
Min Ckt
Amps
UNIT
50AH
V-PH
(60 Hz)
VOLTAGE
RANGE
COMPRESSOR
Min Max QTY RLA LRA Hp FLA Hp FLA
024 208/230-1 187 254 1 N/A N/A N/A N/A N/A N/A N/A N/A
036
048
060
072*
096*
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
1
208/230-1 187 254
208/230-3 187 254 13.6 83.1 1 2.4
460-3 414 508 6.1 41.0 1 1.2
1
208/230-1 187 254
208/230-3 187 254 16.0 110.0 1 2.4
460-3 414 508 7.8 52.0 1 1.2
1
208/230-1 187 254
208/230-3 187 254 N/A N/A N/A N/A N/A N/A N/A N/A
460-3 414 508 N/A N/A N/A N/A N/A N/A N/A N/A
2
208/230-1 187 254
208/230-3 187 254 13.6 83.1 2 6.0 3 8.4 45.0 55
460-3 414 508 6.1 41.0 2 2.9 3 4.0 20.6 25
2
N/A N/A N/A N/A N/A N/A N/A N/A
19.9 109.0 1 3.2
26.4 134.0 1 3.2
3
/
3.2 31.3 50
4
3
/
2.4 21.8 35
4
3
/
1.2 10.0 15
4
3
/
3.2 39.4 65
4
3
/
2.4 24.8 40
4
3
/
1.2 12.2 20
4
N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A
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
*Unit has two compressors.
MOCP
Amps
UNIT
SIZE
50AH
CFM
RpmBhpRpmBhpRpmBhpRpmBhpRpmBhpRpmBhp
900 509 0.11 632 0.14 739 0.19 833 0.24
024
800 495 0.07 623 0.12 733 0.17 829 0.22 915 0.28
700 470 0.06 604 0.10 717 0.14 814 0.19 901 0.25
1350 550 0.17 651 0.23 744 0.29 831 0.36
036
1200 526 0.14 635 0.19 734 0.25 825 0.31 908 0.38
1050 510 0.11 627 0.16 731 0.21 824 0.27 910 0.33 988 0.40
1800 607 0.29 685 0.36 760 0.43
048
1600 566 0.22 652 0.28 734 0.35 813 0.42
1400 537 0.17 632 0.23 722 0.29 806 0.35 886 0.42
2250 640 0.44
060
2000 588 0.32 670 0.40
1750 552 0.24 642 0.31 725 0.38
2700 461 0.36 543 0.47 619 0.60
072
2400 449 0.29 537 0.40 616 0.53 ——————
2100 435 0.24 529 0.34 611 0.47 683 0.61 ————
3600 555 0.74 618 0.87
096
3200 514 0.66 584 0.80 652 0.81
2800 448 0.37 552 0.51 626 0.64 695 0.79
LEGEND NOTES:
Bhp — Brake Horsepower
Table 3 — Evaporator-Fan Performance
EXTERNAL STATIC PRESSURE (in. wg)
0.2 0.4 0.6 0.8 1.0 1.2
919 0.30 997 0.37
993 0.34
979 0.31
912 0.43 — —
986 0.45
832 0.50 902 0.58 ——
888 0.49 960 0.56
962 0.49
715 0.52 786 0.61——————
747 0.48 819 0.56 889 0.64 — —
803 0.46 878 0.53 950 0.61
689 0.75 — — — —
680 1.01——————
707 0.94 769 1.10 — —
759 0.95 818 1.12
1. Refer to Table 1 for evaporator fan motor and drive information.
2. Upgrade 1 Static Motor is required for boldface values.
3. Upgrade 2 Static Motor is required for shaded values.
16
Table 4 — Condenser-Fan Performance
UNIT
SIZE
50AH
024 1700 247 0.07 255 0.07 262 0.08 269 0.08 277 0.08 2840.09
036 2000 276 0.11 2820.11289 0.12 295 0.12 301 0.12 307 0.13
048 2500 251 0.17 305 0.18 357 0.22 408 0.27 456 0.32
060 3000 287 0.22 334 0.28 378 0.33 421 0.38
072 5200 367 0.68 438 0.89 464 0.98 490 1.07 516 1.16 542 1.25
096 6400 448 1.26 524 1.59 546 1.70
Bhp — Brake Horsepower
CFM
LEGEND NOTES:
0.0 0.1 0.2 0.3 0.4 0.5
RpmBhpRpmBhpRpmBhpRpmBhpRpmBhpRpmBhp
START-UP
Unit Preparation —
accordance with installation instructions and applicable codes.
Make sure unit has been installed in
Compressor Mounting — Compressors are internally
mounted on rubber-in-shear (RIS) isolators. Do not loosen or
remove compressor holddown bolts.
EXTERNAL STATIC PRESSURE (in. wg)
568 1.81————
1. Refer to Table 1 for condenser fan motor and drive information.
2. Upgrade 1 Static Motor is required for boldface values.
3. Upgrade 2 Static Motor is required for shaded values.
Disconnect all power to the unit before performing maintenance or service. Electrical shock and personal injury could
result.
501 0.37
464 0.43 505 0.49
SERVICE
WARNING
Internal Wiring — Check all electrical connections in
unit control boxes and tighten as required.
Refrigerant Service Valves — Each unit system has
2 Schrader-type service ports, one on the suction line and one
on the compressor discharge line. Be sure that caps on the ports
are tight.
Compressor Rotation — On 50AH036-096, 3-phase
units, it is important to be certain compressor is rotating in the
proper direction. To determine whether or not compressor is
rotating in the proper direction:
1. Connect service gages to suction and discharge pressure
fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge pressure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pres-
sure does not rise to normal levels:
1. Note that the condenser and evaporator fans may also be
rotating in the wrong direction.
2. Turn off power to the unit and tag disconnect.
3. Reverse any two of the unit power leads.
4. Reapply power to the unit; remove tag.
5. Verify correct refrigerant pressures.
The suction and discharge pressure levels should move to
their normal start-up levels.
NOTE: When the compressor is rotating in the wrong direc-
tion, the unit will sound louder than normal and will not
provide cooling.
Cooling — To start unit, turn on main power supply. Set
system selector switch at COOL position and fan switch at
AUTO. position. Adjust thermostat to a setting below room
temperature. Compressor, condenser and evaporator motors
start on closure of contactors.
TO SHUT OFF UNIT — Set system selector switch at OFF
position or reset thermostat at a position above room
temperature.
IMPORTANT: If repairs to refrigerant cycle components (e.g., compressor, filter drier, etc.) are required,
recover all refrigerant from the system by using both
high and low-pressure ports. Then remove base unit
from the space.
Filters —
Filters are disposable and should be inspected and
replaced at regular intervals monthly or as conditions require.
They are located in front of the evaporator coil and may be removed by sliding them horizontally out to edge of unit. See
Fig. 2-5. No tools are required for installation or removal of
filters.
Condenser Coil — The condenser coil is accessible
through the side access panel on condenser section, or through
side access panel on condenser section. Use a stiff brush when
cleaning coil. Be careful not to bend aluminum fins.
Evaporator Coil — The evaporator coil is accessible for
cleaning through the side access panel on evaporator section.
When necessary, wash coil with a commercial cleaner (Oakite
164) or dishwasher detergent using a pressurized spray canister. Flush coil from return-air duct side and take care not to get
water in ductwork or unit insulation.
Condensate Drain — Clean and empty drain pan at
least once a year to prevent sludge build-up.
Lubrication — Lubrication of the condenser and evapora-
tor motors is not necessary since both are equipped with
permanently lubricated bearings. Do not oil.
Unit Condenser Motor — All 50AH units contain
belt-driven adjustable-pulley fan systems. The unit fan motors
are shipped with adjustable pulley at 4 turns open.
Blower Wheel Servicing — In-space servicing is rec-
ommended for the evaporator and condenser blowers. Both are
removed by loosening and removing the 2 screws (sizes 024-
060) or 4 screws (sizes 072 and 096) that hold them in place. In
both cases, the entire assembly is then moved outside of the
base unit. Once outside, the blower wheel and condenser shaft
bearings and/or evaporator motor can be serviced.
17
Blower Belt Adjustment — Inspect blower belt for
Fig. 9 — Sheave Alignment
a50-7135tf
BELT SPAN
LB FORCE
DEFLECTION
Fig. 10 — Fan Belt Tension
a50-7136ef
wear, proper belt tension, and pulley alignment as conditions
require or at the beginning of each heating and air conditioning
season.
Make sure that fan shafts and motor shafts are parallel and
level. The most common causes of misalignment are nonparallel shafts and improperly located sheaves. Where shafts are not
parallel, belts on one side are drawn tighter and pull more than
their share of the load. As a result, these belts wear out faster,
requiring the entire set to be replaced before it has given maximum service. If misalignment is in the sheave, belts enter and
leave the grooves at an angle, causing excessive belt and
sheave wear.
SHAFT ALIGNMENT — Check shaft alignment by measuring the distance between the shafts at 3 or more locations. If the
distances are equal, then the shafts are parallel.
SHEAVE ALIGNMENT
1. To check the location of the fixed sheaves on the shafts,
use a straightedge or a piece of string. If the sheaves are
properly aligned, the string will touch them at the points
indicated by the arrows in Fig. 9. Rotate each sheave a
half revolution to determine whether the sheave is wobbly or the drive shaft is bent. Correct any misalignment.
2. With sheaves aligned, tighten cap screws evenly and
progressively.
NOTE: There should be a
the mating part hub and the bushing flange. If the gap is
closed, the bushing is probably the wrong size.
3. With taper-lock bushed hubs, be sure the bushing bolts
are tightened evenly to prevent side-to-side pulley wobble. Check by rotating sheaves and rechecking sheave
alignment. When substituting field-supplied sheaves for
factory-supplied sheaves, only the motor sheave should
be changed.
BELT TENSION ADJUSTMENT — Using a gage, apply
4 lb of force to the center of the belt and adjust the tension until
a deflection of
1
/64-in. is achieved for every inch of shaft center
distance. See Fig. 10.
Ideal belt tension is the lowest value under which belt slip
will not occur at peak load conditions.
1
/8-in. to 1/4-in. gap between
Refrigerant Charge — Unit is shipped fully charged.
Amount of refrigerant charge is listed on unit nameplate (also
refer to Table 1). Refer to Carrier GTAC II; Module 5; Charging, Recovery, Recycling, and Reclamation manual.
Unit panels must be in place when unit is operating during
charging procedure. Unit must operate for at least 10 minutes
before adjusting charge. Use standard evacuating techniques.
After evacuating system, weigh in the specified amount of refrigerant. (Refer to Table 1.)
18
Copyright 2010 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500057-01 Printed in U.S.A. Form 50AH-14SI Pg 20 5-10 Replaces: 50AH-12SI
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