50AH
Horizontal Indoor
Single-Package
Cooling Units
Product
Data
2 to 5 Nominal Tons
Single Package Cooling Units
Featuring:
• compact design
• flexibility
• easy maintenance
• high quality and reliability
• quiet and efficient scroll compressor
technology
Features/Benefits
All in one package — high
cooling efficiency,
installation convenience,
ease of accessibility for time-
saving maintenance.
Space and cost saving design
Model 50AH is specifically designed to
provide the building owner with truly out-
of-sight cooling, because it installs inside
the ceiling. That’s why we call it the Car-
rier ROOMTOP® unit. The compact de-
sign 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 hor-
izontally. Centrifugal fans permit ducting
of both evaporator and condenser air.
Quiet operation
Commercial end users appreciate the ex-
tra comfort of quiet operation. Carrier
engineers met the challenge by specify-
ing 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
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
5.4
480, 206/274
5.5
580, 250/330
7.4
590, 254/336
7.6
REFRIGERANT TYPE
Operating Charge (lb)†
R-22
COMPRESSOR — TYPE
Quantity...Model
Oil (oz)
Scroll
(1)...ZR23
24
(1)...ZR34
42
(1)...SR48
70
(1)...ZR57
54
HPS Setting (psig)
Cutout
426
320 20
7
Reset
LPS Setting (psig)
Cutout
27
67
4
7
Reset
CONDENSATE DRAIN CONNECTION
Size (in.)...Type
CONDENSER COIL
Size (L x H) (in.)
Number of Rows...Fins/in.
3/4...FPT
Copper Tubes — Aluminum Fins
40 x 16
40 x 15
4...13.6
40 x 22
4...13.6
4...17
CONDENSER FAN
Nominal Cfm
Centrifugal — Direct Drive
1350
Centrifugal — Belt Drive
2250
1350
2450
Maximum Rpm
Blower Size (in.)
Pulley Pitch Diameter (in.)
Blower
1100
1500
12 x 9
12 x 6
None
None
5.0
6.0
1.9-2.9
1
6.0
2.4-3.4
11/2
Motor (Variable)
Motor Hp
Motor Rpm
2.4-3.4
1
/
3
/
2
4
825
1725
1725
1725
EVAPORATOR COIL
Size (L x H) (in.)
Number of Rows...Fins/in.
Copper Tubes — Aluminum Fins
34 x 16
4...15
34 x 15
4...14.4
34 x 22
4...14.4
EVAPORATOR AIR FAN (Standard)
Nominal Cfm
Centrifugal — Direct Drive
800
1200
1150
1600
1600
2000
Max Rpm
1100
900/1050**
Blower Size (in.)
Motor Hp (Rpm)
10 x 5
6 (850)
10 x 6
2 (1075)
10 x 6
1
1
/
3
/
/4 (1050)
EVAPORATOR AIR FAN (Optional)
Nominal Cfm
Centrifugal Belt Drive
2000
Max Rpm
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)
INDOOR-AIR FILTERS
Number...Size (in.)
Factory-Supplied Cleanable Type
1...14 x 34 x 1
1...21 x 34 x 1
INTERCONNECTING TUBING SIZE (in.)††
1
3
1
3
1
3
1
3
Hot Gas
/
2
/
8
/
/
2
/
8
/
2
/
8
2
8
Liquid
/
LEGEND
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 rep-
resentative for more information. For additional piping information, refer to Carrier
System Design Manual, Part 3.
HPS
LPS
—
—
High-Pressure Switch
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.
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
50AH
1
2
3
4
A
B
5
024
036
93/42 108/49 139/63 120/54 2-5 /737 2-1 /8/651
3
95/43 113/51 148/67 124/56 2-4 /4/730 2-2 /660
048 112/51 143/65 183/83 142/64 2-5 /737 2-3 /686
3
3
060 114/52 143/65 186/84 147/67 2-4 /4/730 2-2 /4/679
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 Cycle-
LOC™ 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.
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.
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 open-
ing. The heater control box is accessible from the bottom
of heater.
Vibration isolators — Package of four isolators used for
dampening any unit vibration so that vibrating sounds are
not transmitted to building structure. Isolators are spring,
ceiling type.
88EN ELECTRIC HEAT MODULE
ACCESSORY
HEAD PRESSURE CONTROL DAMPER (in.)
DIMENSIONS (in.)
UNIT
50AH
DUCT
OPENING
A
B
C
D
1
1
1
1
024,036 13 /2 16
2 /2 8 /2
7 /8 x 14
3
1
7
048,060 24 21 /4
3
19
7 /8 x 20 /8
4
Base unit dimensions
DIMENSIONS (ft-in.)
UNIT
50AH
A
B
C
D
E
5
3
024
036
048
060
2-5
2-4 /4
2-5
2-1 /8
2-2
2-3
1- 5 /4
1-2
1-2
1-1
1-1
1-7 /8
3
3
1- 5 /4
5
7
7
1-11 /8 1-8 /8
3
3
5
7
7
2-4 /4
2-2 /4
1-11 /8 1-8 /8
1-7 /8
UNIT COMPONENT LOCATIONS
5
Selection procedure (with example)
I Determine cooling requirements at design
conditions.
1200 cfm and 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.
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
Enter Evaporator Fan Performance table at
1200 cfm and 50AH036 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.
External Static Pressure:
Condenser . . . . . . . . . . . . . . . . . . .0.50 in. wg
Evaporator (includes static pressure
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.
NOTE: Unit 50AH024 contains a direct-drive con-
denser fan assembly.
drop of factory-supplied filter
of 0.06 in. wg) . . . . . . . . . . . . . . .0.20 in. wg
II Select unit based upon required cooling
capacity.
Enter cooling capacity table at temperature of air
entering condenser of 95 F. The 50AH036 unit at
Performance data
GROSS COOLING CAPACITIES
50AH024
50AH036
Evaporator Air Quantity — Cfm/BF
Evaporator Air Quantity — Cfm/BF
Temp
Air Ent
Condenser
(F)
Temp
600/0.02
800/0.03
1000/0.04
900/0.01
Evaporator Air Ewb Temp (F)
62 72 67 62 72
45.0 41.1 37.3 45.8 42.3 38.6 46.5 43.4 39.8
1050/0.01
1200/0.02
Air Ent
Condenser
(F)
Evaporator Air Ewb Temp (F)
72
67
62
72
67
62
72
67
62
72
67
67
62
TC
27.1 25.3 23.0 27.7 26.4 24.6 27.8 26.9 25.8
TC
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)
50AH048
50AH060
Evaporator Air Quantity Cfm/BF
1600/0.08
Evaporator Air Quantity — Cfm/BF
Temp
Air Ent
Condenser
(F)
Temp
Air Ent
Condenser
(F)
1200/0.06
2000/0.10
1500/0.06
2000/0.09
2250/0.10
Evaporator Air Ewb Temp (F)
72 67 62 57 72 67 62 57 72 67 62 57
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
evaporator col (h ).
lwb
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:
= Enthalpy of air entering evaporator coil
h
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 — 50AH
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
.52
.55
.57
—
1.045
.97
—
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
External Static Pressure (in. wg)
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.
ESP
kW
—
—
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 — 50AH
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
External Static Pressure (in. wg)
Total Fan Power Motor Input (kilowatts)
ESP
kW
—
—
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)
0.2 0.3 0.4
UNIT
50AH
COND
CFM
0.0
0.1
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.
kW — Total Fan Motor Power Input (kilowatts)
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.
NOTES:
1. Above fan performance is based upon coil and deducted casing
losses only.
8. Care should be taken when hoods and/or louvers are installed to
avoid condenser air recirculation.
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
ELECTRIC HEATER STATIC PRESSURE DROP (in. wg)
UNIT CFM
ELECTRIC HEATER
UNIT 88EN
UNIT
50AH
MIN
CFM
600
.02
.03
800
.04
.06
1000
.06
.10
1200
.10
.16
1400
—
—
1600
—
1800
—
2000
—
2200
—
0500CA01
0075CA01
0115CA01
0075EA01
1150EA01
400
510
620
320
720
024, 036
1-stage
heat
—
—
—
—
.04
.08
.13
.19
—
—
—
—
—
0100EA01
0150EA01
0200EA01
0300EA01
0300CA01
0100FA01
0150FA01
0200FA01
0300FA01
970
—
—
—
—
—
—
.04
.08
.06
.11
.08
.14
.12
.18
.15
.22
.17
.26
1240
1350
1220
1220
1130
1360
048, 060
2-stage
heat
—
—
—
—
—
—
.04
.08
.06
.11
.08
.14
.12
.18
.15
.22
.17
.26
1350
1270
NOTE: Above electric heaters are not UL (Underwriters’ Laboratories) or CSA (Canadian Standards Association)
listed for use with optional high-static evaporator-fan motor (048, 060 units only).
Controls
Operating sequence
Cooling — Thermostat calls for cooling. Indoor (evapora-
tor) fan relay is energized and starts evaporator fan. Com-
pressor contactor is energized to start compressor and
condenser fan (up to a 5-minute delay on single-phase
units). When room thermostat is satisfied, the evaporator
fan, compressor, and condenser fan shut off.
Continuous fan operation — The thermostat can be
set for continuous operation by setting the fan switch to
ON.
Electrical data
FAN MOTORS
POWER SUPPLY
VOLTAGE RANGE
COMPRESSOR
UNIT
50AH
V-PH
Evaporator
Condenser
Hp FLA
Min Ckt
Amps
MOCP
Amps
(60 Hz)
Min
Max
RLA
LRA
Hp
FLA
024
036
230-1
207
254
11.4
56
.17
1.10
.50
3.40
19.0
25
230-1
208/230-3
460-3
207
187
414
254
254
508
17.2
10.3
5.1
96
77
40
.50
.50
.50
3.20
3.20
1.50
.75
.75
.75
6.06
3.93
1.97
29.5
19.9
8.9
40
25
15
230-1
208/230-3
460-3
207
187
414
254
254
508
24.4
15.5
7.4
150
105
55
.75
.75
.75
4.00
4.00
2.15
1.0
1.0
1.0
8.35
3.93
1.97
42.9
27.3
13.4
60
35
20
048
208/230-3
460-3
230-1
208/230-3
460-3
187
414
207
187
414
254
508
254
254
508
15.5
7.4
28.8
17.3
9.0
105
55
169
123
62
1.5
1.5
.75
.75
.75
5.60
2.80
4.00
4.00
2.15
1.0
1.0
1.5
1.5
1.5
3.93
1.97
9.50
4.82
2.41
28.9
16.3
49.5
30.4
15.8
35
20
60
40
20
048*
060
208/230-3
460-3
187
414
254
508
17.3
9.0
123
62
1.5
1.5
5.60
2.80
1.5
1.5
4.82
2.41
32.0
16.0
40
20
060*
LEGEND
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
*Optional evaporator-fan motor nameplate data.
9
Electrical data (cont)
ELECTRIC HEATER DATA
BRANCH CIRCUIT
MCA
ELECTRIC HEATER
UNIT 88EN
USED WITH
UNIT 50AH
V-PH
(60 Hz)
CAP. (kW)
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
MCA
—
Minimum Circuit Ampacity
MOCP — Maximum Overcurrent Circuit Protection
(Fuses or Circuit Breaker)
*May be field converted to single-phase units, see electric heat installation instructions.
NOTE: Separate power source is required for all heaters. Control from base unit 50AH (24 v).
10
Typical wiring schematic
50AH048,060 — 230-1-60 UNITS
LEGEND
AHA
C
— Adjustable Heat Anticipator
— Contactor Compressor
— Circuit Breaker
Marked Wire
CB
CC
Denotes connection point between subbase and thermostat
— Cooling Compensator
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
EQUIP GND — Equipment Ground
HPS
HR
— High-Pressure Switch
— Heater Relay
IFC
IFR
JB
— Indoor (Evaporator) Fan Contactor
— Indoor (Evaporator) Fan Relay
— Junction Box
Field Splice
L
— Light
Splice (Marked)
LPS
NEC
PL
— Low-Pressure Switch
— National Electrical Code
— Plug Assembly
Factory Splice
TB
— Terminal Block
Factory Wiring
TC
— Thermostat-Cooling
— Thermostat-Heating
— Transformer
Accessory or Optional Wiring
Field Control Wiring
TH
TRAN
Field Power Wiring
To indicate common potential only not to represent wiring
11
Typical wiring schematic (cont)
50AH036,048,060 — 208/230-3-60 UNITS
LEGEND
AHA
C
CB
CC
CLO
CT
— Adjustable Heat Anticipator
— Contactor Compressor
— Circuit Breaker
Marked Wire
Denotes connection point between subbase and thermostat
— Cooling Compensator
— Compressor Lockout
— Current Transformer
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
EQUIP GND — Equipment Ground
HPS
HR
— High-Pressure Switch
— Heater Relay
IFC
IFR
JB
— Indoor (Evaporator) Fan Contactor
— Indoor (Evaporator) Fan Relay
— Junction Box
Field Splice
Splice (Marked)
L
— Light
— Lockout Relay
Factory Splice
Factory Wiring
Accessory or Optional Wiring
Field Control Wiring
Field Power Wiring
LOR
LPS
NEC
PL
— Low-Pressure Switch
— National Electrical Code
— Plug Assembly
TB
— Terminal Block
TC
— Thermostat-Cooling
— Thermostat-Heating
— Transformer
To indicate common potential only not to represent wiring
TH
TRAN
12
Typical piping and wiring
LEGEND
NEC — National Electrical Code
3. All piping must follow standard refrigerant piping techniques. Refer
to Carrier System Design Manual, Part 3, for details.
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.
NOTES:
1. Wiring and piping shown are not intended for or to include all
details for specific installation.
2. All wiring must comply with applicable local and national codes.
Application data
OUTDOOR-AIR TEMPERATURE OPERATING LIMITS (F)
UNIT 50AH
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,
maximum length of refrigerant tubing to be used is 50 ft,
assuming components are installed in same horizontal
plane. Condenser may be mounted up to 12 ft above evap-
orator. Liquid line tubing is 3/8-in. OD copper tubing, and
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 wir-
1
4
discharge line is /2-in. OD copper tubing. For additional
ing should be a minimum of no. 16 AWG, /64-in. thick
piping information, refer to Carrier System Design Man-
ual, Part 3. Units should always be within line of sight from
each other, or separate NEC (National Electrical Code)
insulation. Check all applicable electrical codes to ensure
proper compliance.
13
Guide specifications
5. Field splittable through the removal of 4 bolts
and extending refrigerant piping and wiring to
allow remote horizontal or vertical condenser
mounting.
6. Unit shall have an integral hanging bracket
requiring only 4 threaded rods (8 if unit is split)
run to the top flange of the unit for hanging,
eliminating need for external hanger brackets.
Indoor Packaged Unit
HVAC Guide Specifications — Section 15787
Size Range: 2 to 5 Tons, Nominal
Carrier Model Number: 50AH
Part 1 — General
1.01 SYSTEM DESCRIPTION
Indoor mounted, electrically controlled packaged
horizontal cooling unit utilizing a hermetic type
scroll compressor.
7. Contains junction box for power connection
and opening for routing of control wiring.
C. Fans:
1.02 QUALITY ASSURANCE
1. Evaporator:
A. Unit shall be certified in accordance with ARI
Standard 210.
B. Unit shall be UL listed and carry a UL label.
C. Unit shall be CSA approved (except 3 ton, 3-phase
units).
D. Unit shall be factory run-tested to ensure proper
performance prior to delivery.
a. Blower shall be of the forward-curved, cen-
trifugal, direct-drive type or belt drive (4 and
5 tons only).
b. Motor shall have permanently lubricated
bearings.
c. Unit sizes 048, 060 shall be available with
an optional 1.5 hp fan motor.
1.03 DELIVERY, STORAGE, AND HANDLING
2. Condenser:
A. Unit shall be shipped completely assembled and
ready to operate.
B. Unit shall be shipped factory charged with refriger-
ant R-22.
C. Unit shall be stored and handled in accordance with
the unit manufacturer’s instructions.
a. Blower shall be of the forward-curved, cen-
trifugal, direct-driven type (024 only), or belt
drive (036,048,060).
b. Motor shall have permanently lubricated
bearings.
D. Compressor:
Part 2 — Products
2.01 EQUIPMENT
A. General:
1. Fully hermetic scroll type.
2. Mounted on suitable spring vibration isolators.
3. Equipped with internal line break protection.
Factory assembled horizontal, single piece, air
cooled, indoor, ceiling plenum mounted electric
cooling unit. Contained within the unit enclosure
shall be all factory wiring, piping, controls, refriger-
ant charge (R-22), and special features required
prior to start-up.
E. Coils:
Evaporator and condenser coils shall be of non-
ferrous construction with aluminum fins mechani-
cally bonded to seamless copper tubes with all joints
brazed.
F. Refrigerant Components:
Refrigerant components shall include:
1. Capillary tube feed system.
2. Refrigerant filter-drier.
B. Unit Cabinet:
1. Constructed of galvanized steel.
2. Interior shall be insulated with 1/2-in. thick neo-
prene coated fiberglass. Insulation shall be
bonded to interior surfaces by sprayed water
reduceable adhesive.
3. Equipped with 3 same side access panels and
2 bottom hanging removable doors to facilitate
ease of maintenance. Side panels allow access
to the control box, refrigeration components,
and condenser coil. Control box shall be hinged
allowing access to the compressor and pressure
switches. Bottom doors shall allow access to
and easy removal of the condenser and evapo-
rator motors and blower assemblies.
G. Filter Section:
Filter section shall consist of factory-installed, per-
manent, cleanable air filter, removable from the
same side as the access panels without the use of
tools.
H. Controls and Safeties:
Control system shall include a high-pressure switch,
a low-pressure switch, and a compressor lockout
feature which upon tripping of any safety device
shall prevent compressor from restarting until reset
at the thermostat (on all 3-phase units and 036
single-phase units only).
Time Guard® II device (single-phase only) shall pre-
vent the compressor from restarting for a minimum
of 5 minutes after shutdown.
4. Equipped with two 3/4-in. threaded condensate
drain connections below the evaporator coil
3
and one /4-in. threaded connection for con-
denser coil wash down. Connections shall be
factory plugged for field removal.
14
I. Operating characteristics:
3. Time Guard® II Device Compressor Cycle
Delay:
1. Unit shall operate using refrigerant R-22.
Prevents compressor from restarting for a mini-
mum of 5 minutes after shutdown.
* 4. Condensate Pump:
2. Unit shall be designed for indoor suspended
horizontal mounting and operation.
J. Electrical Requirements
Unit shall be equipped with remotely located
condensate pump. A field-installed light shall
illuminate when reservoir rises above a preset
level. Unit shall shut down upon reservoir light
illumination.
Unit shall have single point power connection to
leads in terminal box.
K. Special Features:
Certain standard features are not applicable when
the features designated by * are specified. For assis-
tance in amending the specifications, your local
Carrier Sales Office should be contacted.
* 5. Head Pressure Control Package:
Allows unit to mechanically cool down to 0° F
ambient temperature. Package shall include
damper operating device and all necessary
hardware.
* 1. Electric Heat Module:
a. Provides encased heater elements that shall
attach directly to the base unit discharge.
b. Shall have bottom access.
c. UL listed.
6. Vibration Isolation Package:
Shall provide 4 spring hangers for ceiling
mounted unit to damper vibration that may be
transmitted to building structure.
2. Thermostat Assembly:
Provides cooling and fan control. Standard sub-
base shall include ‘‘Compressor malfunction
light’’ designed to illuminate if compressor lock-
out is activated.
15
Carrier Corporation • Syracuse, New York 13221
204
9-02
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
New Book 1
Tab IP1a
Pg 16
Catalog No. 525-00039
Printed in U.S.A.
PC 111
Form 50AH-6PD
Replaces: 50AH-5PD
Tab 2b 7a
|