Carrier 50AH User Manual

Product
Data

50AH

Horizontal Indoor

Single-Package

Cooling Units

2to5NominalTons

Single Package Cooling Units
Featuring:

• compact design

• flexibility

• easy maintenance

• high quality and reliability

• quiet and efficient scroll compressor
technology

Features/Benefits

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

Space and cost saving design

Model 50AH is specifically designed to
provide the building owner with truly out­of-sight cooling, because it installs inside
the ceiling. That’s why we call it the Car­rier ROOMTOP® unit. The compact de­sign and low silhouette enable it to fit
easily and securely above the conditioned
space. Single-package construction
makes it easy to install with minimal time
and cost.

Application flexibility

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

Quiet operation

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

Easy maintenance

When it comes to maintenance, the
50AH rates high in accessibility. Indoor

Copyright 2002 Carrier Corporation Form 50AH-6PD

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

Carrier quality and reliability

The Carrier 50AH ROOMTOP® 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.

Table of contents

Page

Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2

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

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

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

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

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

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

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-9

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

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

Typical Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11,12

Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14,15

Scroll compressor technology

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

Quality Assurance

®

I

S

O

9

0

0

1

:

2

5

2

3

2

A

#

0

0

0

Model number nomenclature

50AH–048–M–541XX

Model Designation –

50AH Horizontal,
Indoor Single-Package
Cooling Unit

Nominal Tons

024 – 2
036 – 3

Indoor Fan Motor

– – Standard Motor
M – 1.5 hp Optional Motor

*FIOP — Factory-Installed option, contact your Carrier representative for details.

048–4
060–5

FIOP*

Packaging

1 – Domestic
2 – Export

Design Revision

Voltage

3 – 230-1-60
5 – 208/230-3-60

6 – 460-3-60

ARI* capacity ratings

UNIT

50AH

024 230-1-60 2.56 24,800 800 — — 10.50† 78

036

048

060

dB — Decibels
EER — Energy Efficiency Ratio
SEER — Seasonal Energy Efficiency Ratio
TDR — Time-Delay Relay 2. EER =

*Air-conditioning and Refrigeration Institute.

†TDR is standard.

V-P H- Hz

230-1-60

460-3-60 8.40 — —
230-1-60

460-3-60 8.80 — —
230-1-60

460-3-60 8.50 — —

LEGEND

TOTAL

kW

4.3 36,000 1200

5.63 49,500 1600

6.9 58,500 2000

NET TOTAL

COOLING CAP. (Btuh)

NOTES:

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

NET CAPACITY (Btuh)

TOTAL WATTS

NOMINAL

CFM

EER SEER

— 10.00 10.00

—— 10.00†

—9.7010.00

SEER

(with TDR)

SOUND RATING

(dB)

82208/230-3-60 8.40 — —

82208/230-3-60 8.80 — —

82208/230-3-60 8.50 — —

2

Physical data

UNIT 50AH 024 036 048 060
SHIPPING WEIGHT (lb)* 560 590 690 700
OPERATING WEIGHT (lb)

Base Unit, Evaporator/Condenser Section 450, 193/256 480, 206/274 580, 250/330 590, 254/336

REFRIGERANT TYPE R-22

Operating Charge (lb)† 5.4 5.5 7.4 7.6

COMPRESSOR — TYPE Scroll

Quantity...Model (1)...ZR23 (1)...ZR34 (1)...SR48 (1)...ZR57
Oil (oz) 24 42 70 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 COIL Copper Tubes — Aluminum Fins

Size (L x H) (in.) 40 x 15 40 x 16 40 x 22
Number of Rows...Fins/in. 4...13.6 4...17 4...13.6

CONDENSER FAN Centrifugal — Direct Drive Centrifugal — Belt Drive

Nominal Cfm 1350 1350 2250 2450
Maximum Rpm 1100 1500
Blower Size (in.) 12 x 6 12 x 9
Pulley Pitch Diameter (in.)

Blower None 5.0 6.0 6.0

Motor (Variable) None 2.4-3.4 1.9-2.9 2.4-3.4
Motor Hp
Motor Rpm 825 1725 1725 1725

EVAPORATOR COIL Copper Tubes — Aluminum Fins

Size (L x H) (in.) 34 x 15 34 x 16 34 x 22
Number of Rows...Fins/in. 4...14.4 4...15 4...14.4

EVAPORATOR AIR FAN (Standard) Centrifugal — Direct Drive

Nominal Cfm 800 1200 1600 2000
Max Rpm 1100 1150 900/1050**
Blower Size (in.) 10 x 5 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

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

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.

**Two-speed motor.

††Use Type L copper only.

LEGEND

1

1

/6(850)

1
3

/

2

Not

Available

/

2

/

8

3

/

4

1

/2(1075)

1

/

2

3

/

8

NOTE: If components are to be split, the maximum length of refrigerant tubing to be
used is 50 equivalent ft, assuming components will be installed in same horizontal plane.
If components are not to be installed in same hor izontal plane, contact your Carrier rep­resentative for more information. For additional piping information, refer to Carrier
System Design Manual, Part 3.

3

/4...FPT

11

3

/4(1050)

Centrifugal Belt Drive

1

/

2

1

/

2

3

/

8

1

/

2

1

/

2

3

/

8

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

UNIT
50AH

WEIGHT (lb/kg)

OF CORNER

1 234 A B
024 93/42 108/49 139/63 120/54 2-5 /737 2-1
036 95/43 113/51 148/67 124/56 2-4
048 112/51 143/65 183/83 142/64 2-5 /737 2-3 /686
060 114/52 143/65 186/84 147/67 2-4

DIMENSIONS

(ft-in./mm)

5

3

/4/730 2-2 /660

3

/4/730 2-23/4/679

/8/651

3

Field-installed accessories

Thermostat and subbase — Attractive wall-mounted
24-v accessory provides precise temperature control.
Automatic and Manual changeover models available. A
thermostat subbase is available that works with Cycle­LOC™ circuitry. If a safety device trips, compressor locks
out and subbase warning light (LK OUT) alerts occupant.

Three models available: One stage cool/two stage heat;
two stage cool/two stage heat; one stage cool/one stage
heat.

Time Guard® II circuit (standard on single-phase
units) — Time Guard II device prevents short cycling of

compressor if thermostat is rapidly changed; automatically
prevents compressor from restarting for 5 minutes after
shutdown.

Electric heaters — A wide range of models is available
from 5 to 30 kW, 208-, 240- and 480-v, single- and 3-ph
units. The heaters mount easily on 50AH discharge open­ing. The heater control box is accessible from the bottom
of heater.

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

Head pressure control damper — This accessory is
duct mounted and allows unit to mechanically cool down to
0° F.

Damper dimensions fit 024, 036 sizes.

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

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

88EN ELECTRIC HEAT MODULE

UNIT

50AH

024,036 13

048,060 24 21

ACCESSORY

DIMENSIONS (in.)

ABCD

1

/216 21/281/271/8x14

3

/431971/8x207/

HEAD PRESSURE CONTROL DAMPER (in.)

DUCT

OPENING

8

4

Base unit dimensions

DIMENSIONS (ft-in.)

UNIT

50AH

024 2-5 2-1
036
048
060

ABCDE

5

3

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

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

3

2-4

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

/81- 53/41-2 1-1

UNIT COMPONENT LOCATIONS

5

/81-87/81-77/

8

8

5