Carrier 50AH User Manual

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  

Briggs Stratton 302400 User Manual
Brodit Molex Active Holder User Manual
Carrier 38EC User Manual
Cornelius Ice Drink Dispenser Enduro 250 User Manual
Danby DPAC 13009 User Manual
Epson 1000 ICS User Manual
Friedrich SQ06 User Manual
Haier Air Conditioner HBU 18CF03 User Manual
Haier HWF05XCK T User Manual
HandHeld Entertainment Barcode Reader 4600RP User Manual