Carrier 50YX User Manual
HEATING & COOLING
Product
Data
50YX
High Efficiency Singie-Package
Heat Pumps
1-1/2 to 5 Nominal Tons
Single-Package Heat Pump Units
with the following Premium Features
as Standard:
• scroll compressors with internal
high-pressure and overcurrent
protection
• thermostatic expansion valves
• low-pressure switch
• high efficiency operation
Accessories:
• single point box kit
• electric heaters
Featu res/Benefits
Compact, fully self-contained,
all-electric, combination
heating/cooling unit is
prewired, prepiped, and
precharged for minimum
installation expense.
Easy installation
Round side-by-side duct configuration
on 018-042 units and rectangular
configuration on 048-060 units.
Models install easily on a rooftop or
a ground-level pad.
Efficient operation
Rugged, efficient scroll compressors
are specifically designed for high effi
ciency, improved reliability, and
quiet operation. Each compressor is
mounted on rubber isolators for addi
tional sound reduction. All compres
sors have internal high-pressure,
overtemperature, and overcurrent
protection.
These high efficiency units not only
save electricity by lowering electric
bills, they are also eligible for utility
rebates offered for high efficiency
units.
Copyright 1992 Carrier Corporation
Form 50YX-2PD
Indoor-fan motors have been care
fully selected to minimize energyconsumption and to withstand the
heavy-duty, year-round operation
required by heat pumps. These motors
are designed to meet the require
ments of a wide variety of residential
and light commercial applications.
Direct-drive, PSC (permanent split
capacitor), outdoor-fan motors have
been selected to help reduce energy
consumption Units are designed
for cooling operation down to 55 F
Built-in reliability components include
a low-pressure switch that stops the
compressor if the refrigerant pressure
drops to an unsafe operating level,
a discharge thermostat on the compres
sor which protects against overheat
ing, a thermostatic expansion value
(TXV) which keeps liquid refriger
ant from flooding into the compressor
and ensures optimum performance
under all conditions, and a compressor
time-delag which prevents the com
pressor from attempting to restart for 5
minutes after shutdown, to allow for
pressure equalization
Indoor and outdoor coils are com
puter designed for optimum heat
transfer Vertical outdoor-fan discharge
carries sound and air up and away.
The high-voltage inlet panel is designed
to accommodate a field-installed elec
trical disconnect. A low-voltage ter
minal block simplifies thermostat
connections. Refrigerant service con
nections make checking operating
pressures easier
Time/temperature defrost system is
used to increase heating cycle effi
ciency. This type of defrost system has
proven to be very reliable. The time/
temperature control “looks” for coil
icing conditions only at preset time
intervals, start the defrost cycle only if
the defrost thermostat senses icing
conditions, and automatically ends the
defrost cycle when the coil has
warmed sufficiently to melt the ice.
A separate power supply is not
required for electric heaters when an
accessory single point box kit is used.
This accessory provides for a single
power supply for the packaged unit
and accessory electric heater packages,
and functions as an NEC (National
Electrical Code) approved fused
disconnect
Weatherized cabinets are con
structed of heavy-duty, phosphated,
zinc-coated steel, and are finished with
corrosion-resistant baked enamel
Interior surfaces of the blower section
are insulated to help keep the con
ditioned air from being affected by the
outdoor ambient temperature
Page
Features/Benefits
Model Number Nomenclature ... .... .................................3
ARI Capacities . . ......................................................
Physical Data . .................................
Accessories . . ....
Dimensions . . . . . ..................5
Selection Procedure ............................................. ....
Performance Data . . ...............................................................
Electrical Data
Controls . .... ....................................................................
Typical Control Wiring Schematic
Typical Installation ...
Guide Specifications ....................................... . 18,19
.............................................
....................................
................................................................
........................ ......................................
..............................
........................................
....................
. . . 4
.......................
............................
..........
14,15
......................................
......................................
1,2
6
3
4
7-13
15
16
17
50YX 024 3
Model Number
50YX—High Efficiency
Single-Package
Heat Pumps
Nominal Capacity
018 —1 1/2 Tons
024 — 2 Tons
030 — 2 1/2 Tons
036 — 3 Tons
042 — 3 1/2 Tons
048 — 4 Tons
060 — 5 Tons
V-Ph-Hz
3-208/230-1-60
UNIT
50YX
018
024 2
030
036
042
048
060
ARI
Bels
COP
DOE
HSPF
SEER
c^pac^iii©s
COOLING AND HEATING CAPACITIES AND EFFICIENCIES
NOMINAL
TONS
1У2
STANDARD
CFM
600 18,500
900
2Уг
3
ЗУ2
1100 31,000
1300
1400 41,500
4 1600
5
2000 60,000
LEGEND
Air-Conditioning & Refrigeration Institute
Sound Levels (1 bel = 10 decibels)
Coefficient of Performance
Department of Energy
Heating Seasonal Performance Factor
Seasonal Energy Efficiency Ratio
NET COOLING*
CAPACITIES
AT 95 F (Btuh)
24,800
35,800
48,500
SEER*
12 0
NET HEATING*
CAPACITIES
AT 47 F (Btuh)
17,200
COP*
AT 47 F
30 9,300
NET HEATING*
CAPACITIES
AT 17 F (Btuh)
120 21,500 30 12,000
12 1
29,000
120 34,000
12,0 38,600
12,0
11 0
46,000
54,500
‘Rated in accordance with ARI Standard 210/240-89 and/or U.S Gov
ernment DOE test procedures
tRated in accordance with ARI Standard 270-84
3 1 16,800
3,0
32
32
19,000
21,500
27,000
30 31,000
NOTE, Ratings are net values, reflecting the effects of circulating fan
heat Ratings are based on cooling standard 80 F db, 67 F wb indoor
entering-air temperature and 95 F db outdoor entering-air temperature.
COP*
AT 17 F
1,8
1 8
20
1,9
20
20
1,9
HSPF
70
7,0
'7T
7 0
70
73
70
SOUND
RATINGSt
(Bels)
76 ■'
^ I
82
8 O"
(òlwillll
UNITJOYX
Ml^lGERiS^f]R-22)*
Refrigerant Control
WEIG^
COMPRESSOR
INDOOR FAN
Speeds
Rpm
Diameter (in.)
Width (in.)
Nominal Range (cfm)
Motor Hp
iNDOOiTcbiL^
Rows...Fins/in.
Face Area (sq ft)
OUTDOOR FAN ^
Cfm
Rpm
Diameter (in.)
JWotor Hp
OUTDOOR ^¡L
Rows...Fins/in.
^ace Area (^ft)
FILTER SIZE (in.jt
(Qty) Throwaway
(Qty) Permanent
.
018
330
2
840
10
6
525-750
V4
3 15
34
2200
840
22
Vs
2..17
8.3
(1) 20 X 25
(1) 15 X 20 (1) 15 X 20 (2) 20 X 20
LEGEND
TXV — Thermostatic Expansion Vaive
‘Operating charge is listed on unit nameplate.
fRecommended field-supplied filters are one-in thick.
024 030
036 042
TXV
" 336 340 ’^~407
Scroll
2
840
12
6
700-1000
Va
3 .15 3 ..15 3...15
34 3.4 4.7
2200
840
22
V4
2 17
83
(1) 20 X 25 (2) 15 X 20
Centrifugal — Direct Drive
2
840 840 840
12
6
875-1250 1050-1500
Va
Propeller — Direct Drive
2700
1100
22
V4
2. .20
8 3^__
2 2
12
6 6 6
V2 V2
2700
1100
22
1/4
2. 20
96
(1) 15 X 20
(1) 20 X 20
(2) 20 X 25 (2) 20 X 25
12 12
1100-1650
3 ..15 3. .15
6.0 65
3200
1100
22
1/4
2...17
12.0
(2) 20 X 20
(1) 20 X 25
(1) 25 X 25
(2) 20 X 20
048
423 "
3
1100
1400-1800
Va
3200
1100
22
1/4
2.17
12.7
060
432
2
1100
12
6
1750-2400
%
4...15
6.4
3400
1100
22
1/2
2.. 17
12.7
(1) 20 X 25
(1)25x25
(2) 20 X 20
Electric heaters that mount inside the heat pump indoor-
fan compartment are available in a variety of kW and volt
age options. Each heater assembly includes automatic-reset
switch, and heat limiters for primary and secondary, over
current, and thermal protection
Single point box allows for a single power supply for the
base unit and accessory electric heater, and functions as an
NEC-approved fused disconnect
Service Sentry™ kit provides immediate warning when
the compressor fails to operate after a call for heating or
cooling The control energizes a warning light located on the
indoor thermostat
Outdoor thermostat kit allows for staging of electric heat
ers based on outdoor-air temperature
Thermostat and Subbase provides heating and cooling
unit control Automatic and manual changeover types are
available
ACCESSORY
Electric Heater 5.0 kW
Single Point Box
For 5.0-kW Heaters (Unit Sizes
018,024)
For 7.5- and 10.0-kW Heaters
(Unit Sizes 018,024); For 5.0-kW
Heaters (Unit Sizes 030-060)
For 7.5- and 10.0-kW Heaters
(Unit Sizes 030-048)
For 15.0-kW Heaters (Unit Sizes
030-060); For 20.0-kW Heaters
(Unit Sizes 036-060)
Thermostat and Subbase
Autochangeover
Thermostat and Subbase,
Manual Changeover
Service Sentry™ Kit
Outdoor Thermostat
7.5 kW
10.0 kW
15.0 kW
20.0 kW
PART NO.
88EMOO5OMAO0
88EM0075MA00
88EM0100MAOO
88EM0150MA00
88EM0200MAOO
50YX-900—001
50YX-900—002
50YX-900—003
50YX-900—004
99TZ-900—521
99TZ-900—571
50LQ-900—011
50LQ-900—001
REQUIRED CLEARANCES TO COMBUSTIBLE MATE
RIAL, INCHES (mm)
Maximum Extension of Overhang 48(1219.2)
Unit Top 36(914.4)
Duct Side of Unit 6 min. (152.4 min.)
Side Opposite Ducts 30 (762.0)
Bottom of Unit . 0
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-fan discharge.
2. CG IS center of gravity.
REQUIRED CLEARANCES FOR SERVICING, INCHES
(mm)
Indoor-Fan Access Panel Side 30 (762.0)
Control Box Access Side 30 (762.0)
3. Dimensions in ( ) are in millimeters.
REAR VIEW FOR 50YX048
AND 060 ONLY
UNIT
50YX
ELECTRICAL
CHARACTERISTICS
HEIGHT
UNIT WT CORNER WT Lb/Kg
Lb/Kg
018 208/230-1-60 330/150
024 208/230-1-60
030 208/230-1-60
(561.2)
036 208/230-1-60
042
048 208/230-1-60
060 208/230-1-60
UNIT
50YX
018
024 19%" (504.8)
030 20y,6'' (509.6)
036 20y,6'' (519.1)
042 20y2" (520.7)
048 20%" (523.9)
060
50YX
018-060 : 88EM0075MA00 7.5
030-060
036-060
208/230-1-60 i (622.3) j 407/185 j 86/39 ¡ 98/45
32«/,6"
(833.4)
CENTER OF GRAVITY in./mm
X
19%" (501.7) 21 Ve" (555.6) 101/4" (260.4)
213/4" (552.5) IOV4" (260.4)
211/2" (546.1) 105/16" (261.9)
21s/,6" (547.7) 111/2" (292.1)
213/4" (552.5)
213/4" (552.5) 155/8" (356.9)
20ys" (511)
UNIT ; HEATER kW @
211/4" (540) 151/8" (384)
PART NO. 1 240 V
1 88EM0050MA00 | 5.0
! 88EM0100MAO0 i: 10.0
Í 88EM0150MA00 I 15.0
¡ 88EM0200MA00 I 20.0
060
i 88EM0250MA00
336/152 69/31
340/154 70/32 83/38 79/36
350/159 71/32 85/39 i 84/38
24V2"
423/192 92/42 99/45 108/49
432/196
Y
B
A
68/31
82/37
c
73/33
83/38 76/34 108/49
100/45
95/43 ! 96/44 110/50 131/60
Z
133/4" (349.3)
25.0
D
107/49
109/49
110/50
123/56
124/56
li
il
m
cn
\
HEAT POWER ENTRY
^ecpiiire
I Determine cooling and heating requirements at
design conditions.
Given:
Required Cooling Capacity (TC) .... 28,000 Btuh
Sensible Heat Capacity (SHC)
Required Heating Capacity
Outdoor Entering-Air Temperature
Outdoor-Air Winter Design Temperature
.........
20,500 Btuh
..................
..............
30,000 Btuh
95 F
......
20 F
Indoor-Air Winter Design Temperature..........70 F
Indoor Entering-Air Temperature
...........
80 F edb,
67 F ewb
Indoor-Air Quantity
External Static Pressure
..............................
............
... 0.40 in. wg
1125 cfm
Field-Supplied Filter Pressure Drop . . .0.15 in. wg
Electrical Characteristics (V-Ph-Hz)
.......
230-1-60
II Select unit based on required cooling capacity.
Enter Cooling Capacities table at condenser entering
temperature of 95 F, indoor air entering at 1125 cfm
and 67 F ewb (entering wet bulb). The 50YX030 unit
will provide a total cooling capacity of 31,000 Btuh and
a sensible heat capacity of 24,400 Btuh.
For indoor-air temperature other than 80 F edb (en
tering dry bulb), calculate sensible heat capacity cor
rection, as required, using the formula found in Note 3
following the cooling capacities tables.
NOTE: Unit ratings are net capacities.
Ill Select electric heat.
Enter the Heating Capacities table at 1125 cfm. At
70 F return indoor air and 20 F air entering outdoor
coil, the integrated heating capacity is 16,200 Btuh. (Se
lect integrated heating capacity value since deductions
for outdoor-coil frost and defrosting have already been
made. No correction is required.)
The required heating capacity is 30,000 Btuh. There
fore, 13,800 Btuh (30,000 — 16,200) additional elec
tric heat is required.
Determine additional electric heat capacity in kW
13,800 Btuh
3414 Btuh/kW
= 4.0 kW of heat required
Enter the Electric Heater Packages table for 50YX030
unit. The 5-kW heater at 240 v most closely satisfies
the heating required. To calculate kW at 230 v.
5 kW X .92 = 4 6 kW
5 kW X .92 X 3414 = 15,704 Btuh
To calculate kW at 208 v, see note below Electric Heater
Packages table on page 13.
Total unit heating capacity is 31,904 Btuh (16,200 -f
15,704).
IV Determine fan speed and power requirements at
design conditions.
Before entering Air Delivery tables, calculate the total
static pressure required. From the given and the Elec
tric Heat Accessory Pressure Drop table, find-
External static pressure
Filter
Electric heat
Total static pressure
0.40 in. wg
0.15 in. wg
0.04 in. wg
0.59 in. wg
Enter the Air Delivery table, page 12, at 1125 cfm and
230-v high speed for wet coil. By interpolation, the stan
dard motor will deliver 0.65 in. wg static pressure. This
will adequately handle job requirements.
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