Product
Data
50JZ
Single-Package
Heat Pump
Units
with Puron® (R-410A) Refrigerant
2 to 5 Nominal Tons
Single-Package Products with
Energy-Saving Features and Puron®
refrigerant.
• 12 SEER
• HSPF up to 7.2
• Low Sound Levels
Features/Benefits
One-piece Heat Pump unit with
optional electric heater, low
installation cost, dependable
performance and easy maintenance.
Efficient operation
UNIT 50JZ
High-efficiency design with SEERs
(Seasonal Energy Efficiency Ratio)
of 12.0.
Puron® Environmentally Sound
Refrigerant is Carrier’s unique
refrigerant designed to help protect the
environment. Puron is an HFC
refrigerant which does not contain
chlorine that can harm the ozone layer.
The most important advantage of
Puron refrigerant is that it has not been
banned in future air conditioning
systems as the traditional refrigerant
R-22 has been. Puron refrigerant is in
service in over 100,000 systems
proving highly reliable,
environmentally sound performance.
Easy Installation
Factory-assembled package is a
compact, fully self-contained, heat
pump unit that is pre-wired, pre-piped,
and pre-charged for minimum
installation expense. 50JZ units are
available in a variety of standard
capacity ranges with voltage options to
meet residential and light commercial
requirements. Units install easily on a
rooftop or at ground-level.
Durable, dependable
components
Compressors are designed for high
efficiency. Each compressor is
hermetically sealed against
contamination to help promote longer
life and dependable operation.
Copyright 2000 Carrier Corporation
Form 50JZ-1PD
Vibration isolation provides quiet
operation. Compressors have internal
high-pressure and overcurrent
protection.
Convertible duct configuration
Unit is designed for easy use in either
downflow or horizontal applications.
Each unit is easily converted from
horizontal to downflow and include
horizontal duct covers.
Direct-drive multi-speed, PSC
(permanent split capacitor) blower
motor is standard on all 50JZ models.
Direct-drive, PSC condenser-fan
motors are designed to help reduce
energy consumption and provide for
cooling operation down to 40°F outdoor
temperature. Motormaster® II low
ambient kit is available as a fieldinstalled accessory.
Corporate thermostats include the
Time Guard® II anti-short cycle
protection circuitry. If a non-Carrier
thermostat is used the Time Guard II
field installed anti-short cycle kit is
recommended.
Refrigerant system is designed to
provide dependability. Liquid refrigerant
filter driers are used to promote clean,
unrestricted operation. Each unit leaves
the factory with a full Puron® refrigerant
charge. Refrigerant service connections
make checking operating pressures
easier.
Indoor and Outdoor coils are
computer-designed for optimum heat
transfer and cooling efficiency. The
indoor coil is fabricated from copper
tube and aluminum fins and is located
inside the unit for protection against
damage. The outdoor coil is internally
mounted on the top tier of the unit.
Copper fin coils and pre-coated fin coils
are available from the factory by special
order. These coils are recommended in
applications where aluminum fins are
likely to be damaged due to corrosion.
They are ideal for seacoast applications.
High and Low Pressure Switches give
added safety and reliability to the
compressor.
Low sound ratings ensure a quiet
indoor and outdoor environment with
sound ratings as low as 72 dB.
(See page 3.)
Easy to service cabinets provide easy
single-panel accessibility to serviceable
components during maintenance and
installation. The basepan with
integrated drain pan provides easy
ground level installation with or without
a mounting pad. Convenient handholds
are provided to manipulate the unit on
the jobsite. A nesting feature ensures a
positive basepan to roof curb seal when
the unit is roof mounted. A convenient
3/4-in. wide perimeter flange makes
frame mounting on a rooftop easy.
Louvered Grille provides hail and
vandalism protection for the coil.
Downflow operation is easily provided
in the field to allow vertical ductwork
connections. The basepan utilizes
knockout style seals on the bottom
openings to ensure a positive seal in the
horizontal airflow mode.
Cabinets are constructed of heavyduty, phosphated, zinc-coated
prepainted steel capable of
withstanding 500 hrs of salt spray.
Interior surfaces of the evaporator and
electric heater compartments are
insulated with cleanable semi-rigid
insulation board, which keeps the
conditioned air from being affected by
the outdoor ambient temperature and
provides improved indoor air quality.
(Conforms to American Society of
Heating, Refrigeration and Air
Conditioning Engineers No. 62P.) The
sloped drain pan minimizes standing
water in the drain, which is provided
with an external drain.
Standard metal duct covers with
insulation come with the unit and cover
the horizontal duct openings. These can
be left in place if the units are converted
to downshot.
Table of contents
Page
Features/Benefits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
ARI Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5,6
Base Unit Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,8
Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-18
Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Electrical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21,22
Typical Wiring Schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23-25
Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27-28
2
Model number nomenclature
50JZ
024
3
0
1
BT
Options
- - – Louvered Grille
BT – Louvered Grille, AL indoor
Optionsand vinyl-coated outdoor coil fin
(None)
Wire Grille
CC – –Louvered
Grille, AL indoor and
AD – Louvered
CU/CU Grille
outdoor coil.
BT
Grille and
Vinyl-Coated
Condenser
CU– –Wire
Louvered
Grille,
CU/CU indoor
and
Coiloutdoor
Fin
coil.
XT – Louvered Grille and Vinyl-Coated Condenser Coil Fin
CC – Wire Grille, AL Evaporator and CU/CU
Condenser Coil
AC – Louvered Grille, AL Evaporator and CU/
CU condenser Coil
AU – Louvered Grille, CU/CU Evaporator and
Condenser Coils
Model No.
50JZ – Single Package
........ . Heat Pump
Nominal Cooling Capacity (Tons)
TT
024 – 2
030 – 2-1/2
036 – 3
042 – 3-1/2
048 – 4
060 – 5
Packaging
Series
V-Ph-Hz
3 – 208/230-1-60
5 – 208/230-3-60
6 – 460-3-60
AL — Aluminum
CU — Copper
ARI* capacities
COOLING CAPACITIES AND EFFICIENCIES
UNIT
50JZ
NOMINAL
TONS
STANDARD
CFM
NET COOLING
CAPACITIES
(Btuh)
SEER†
SOUND
RATINGS‡
(dB)
024
030
036
042
048
060
2
2-1/2
3
3-1/2
4
5
800
1000
1200
1400
1600
1750
24,000
29,000
36,000
41,000
47,500
58,000
12.0
12.0
12.0
12.0
12.0
12.0
72
72
77
73
79
79
UNIT
50JZ
HIGH HEAT CAPACITY
(BTUH) @ 47°F
HIGH HEAT COP
@ 47°F‡
LOW HEAT CAPACITY
(BTUH) @ 17°F‡
LOW HEAT COP
@ 17°F‡
HSPF
024
030
036
042
048
060
23,800
28,200
34,400
40,000
44,000
55,000
3.0
3.0
3.0
3.0
3.0
3.0
13,000
15,600
18,000
22,000
23,600
31,000
2.0
2.0
2.0
2.0
2.0
2.0
7.0
7.1
7.2
7.2
7.2
7.2
HEATING CAPACITIES AND EFFICIENCIES
LEGEND
dB
— Sound Levels (decibels)
db
— Dry Bulb
SEER — Seasonal Energy Efficiency Ratio
wb
— Wet Bulb
COP
— Coefficient of Performance
HSPF — Heating Season Performance Factor
* Air Conditioning & Refrigeration Institute.
† Rated in accordance with U.S. Government DOE (Department of
Energy) test procedures and/or ARI Standard 210/240-94.
‡ Tested in accordance with ARI Standard 270-95 (not listed in ARI).
NOTES:
1. 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.
2. Before purchasing this appliance, read important energy cost and
efficiency information available from your retailer.
3
Physical data
UNIT SIZE 50JZ
024
030
036
042
048
NOMINAL CAPACITY (ton)
2
2-1/2
3
3-1/2
4
5
OPERATING WEIGHT (lb)
299
320
328
350
355
428
9.5
10.6
12.4
COMPRESSOR
060
Scroll
REFRIGERANT (R-410A)
Quantity (lb)
7.0
8.9
9.3
AccuRater® Piston
REFRIGERANT METERING DEVICE
Orifice ID (in.)
Orifice OD (in.)
0.061
2@0.032
0.061
2@0.040
0.067
2@0.040
0.073
2@0.038
0.076
2@0.046
0.088
2@0.052
OUTDOOR COIL
Rows—Fins/in.
Face Area (sq ft)
2—17
8.5
2—17
10.3
2—17
10.3
2—17
13.5
2—17
13.5
2—17
15.4
OUTDOOR FAN
Nominal Cfm
Diameter (in.)
Motor Hp (Rpm)
2350
22
1/8 (825)
2350
22
1/8 (825)
2800
22
1/4 (1100)
2500
22
1/8 (825)
3300
22
1/4 (1100)
3300
22
1/4 (1100)
INDOOR COIL
Rows—Fins/in.
Face Area (sq ft)
3—15
3.7
3—15
3.7
4—15
3.7
3—15
4.7
4—15
4.7
4—15
5.7
800
10 x 10
1/4
1000
10 x 10
1/4
1200
10 x 10
1/2
1400
11 x 10
1/2
1600
11 x 10
1/2
1750
11 x 10
1.0
24 x 30 x 1
24 x 30 x 1
24 x 30 x 1
INDOOR BLOWER
Nominal Airflow (Cfm)
Size (in.)
Motor (Hp)
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
610 ± 15
420 ± 25
LOSS-OF-CHARGE/LOW-PRESSURE
SWITCH (Liquid Line) (psig)
Cutout
Reset (Auto.)
20 ± 5
45 ± 10
RETURN-AIR FILTERS (in.)*
Throwaway
20 x 20 x 1
20 x 20 x 1
20 x 24 x 1
5
2
3
UNIT
AR
A
AIR
CO
Y
NING
ITIO
ND
A2
T
IFIED O ARI A
RT
S
C
CE
EQ
RI
YING WITH
PL
OM
MANUFACTUR
ER
* Required filter sizes shown are based on the larger of the ARI (Air Conditioning & Refrigeration Institute) rated
cooling airflow or the heating airflow velocity of 300 ft/minute for throwaway type or 450 ft/minute for highcapacity type. Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
UIP M E N T
STA
NDARD
21
0
OUTDOOR SOUND: OCTAVE BAND DATA—DECIBELS (L w(A))
MODEL NO.
Frequency (Hz)
4
50JZ
024
030
036
042
048
060
63
44.4
43.9
53.6
47.7
57.1
54.6
125
57.5
55.9
63.6
60.4
63.9
64.1
250
61.1
60.9
66.6
64.0
70.4
68.6
500
68.0
66.9
71.1
67.5
72.7
71.2
1000
68.4
67.2
73.2
68.9
73.7
73.9
2000
64.5
63.8
69.6
64.9
71.1
69.8
4000
59.0
62.4
65.9
62.0
66.7
68.1
8000
51.7
52.1
58.4
55.0
59.7
61.8
Options and accessories
range from 5.0 to 20.0 kw. The electric heater design
allows the use of a single-point power supply for the
entire unit, resulting in lower installed costs.
Flat roof curbs in both 8 in. and 14 in. sizes are
available for roof mounted applications.
Square-to-round duct transition kit enables 024-048
size units to be fitted to 14 in. round ductwork.
Thermostats provide control for the system heating and
cooling functions. Thermostat models are available in
both programmable and non-programmable versions.
Lifting kit includes 4 metal brackets that fit into the
hand-holds, a support strap and two safety straps, is
available to assist in lifting this product onto a roof
application.
Crankcase heater provides anti-floodback protection
for low-load cooling applications.
Low-ambient kit (Motormaster II control) allows
the use of mechanical cooling down to outdoor
temperatures as low as 0°F.
Solid-state Time Guard II device provides shortcycling protection for the compressor. Not required
with corporate electronic thermostats.
Filter rack features easy installation, serviceability,
and high-filtering performance for vertical
applications.
Compressor Hard start kit gives a boost to the
compressor motor at each start-up.
Factory-installed options
Coil options include copper/copper and vinyl-coated
construction for refrigerant coils. Units are shipped
standard with copper tube/aluminum fin construction.
See model number nomenclature for coil options.
Field-installed accessories
Economizer with Solid-State Controls and Barometric
Relief Dampers
Manual Air Damper (25% open)
Electric Heaters
Filter Rack
Flat Roof Curbs (8-in. and 14-in.)
Square-to-Round Duct Transition Kit
Thermostats
Crankcase Heater
Low Ambient Kit (Motormaster® II Control)
Solid-State Time Guard® II Device
Lifting Kit
Compressor Hard Start Kit
Economizer with solid-state controls and
barometric relief dampers includes filter racks and
provide outdoor air during cooling and reduce
compressor operation.
Manual outside air damper includes hood and filter
rack with adjustable damper blade for up to 25%
outdoor air.
Electric heaters provide additional heat in the unit
when required. Each package has a heater module that
slides into the controls compartment. Heater sizes
ELECTRIC HEATERS
USED WITH SIZES
024
030
036
042
ELECTRIC HEATERS (208/230 — SINGLE PHASE — 60 Hz)
X
X
X
X
X
X
X
X
X
X
X
X
ELECTRIC HEATERS (208/230 — 3 PHASE — 60 Hz)
X
X
X
X
X
X
X
X
X
X
ELECTRIC HEATERS (460 V — 3 PHASE — 60 Hz)
X
X
X
X
X
X
X
ODS CATALOG
ORDERING NO.
NOMINAL CAPACITY
(kW)
048
060
CPHEATER052A00
CPHEATER050A00
CPHEATER066A00
CPHEATER054A00
5.0
10.0
15.0
20.0
X
X
X
X
X
X
X
X
CPHEATER055A00
CPHEATER056A00
CPHEATER058A00
CPHEATER067A00
5.0
10.0
15.0
20.0
X
X
X
X
X
X
X
X
CPHEATER060A00
CPHEATER061A00
CPHEATER062A00
CPHEATER063A00
5.0
10.0
15.0
20.0
X
X
X
X
X
X
X
X
LEGEND
ODS — Order Distribution System
NOTE: Electric heaters are rated at 240v and 480v. Refer to Multiplication Factors table for other voltages.
MINIMUM AIRFLOW FOR RELIABLE ELECTRIC HEATER OPERATION
UNIT-50JZ
AIRFLOW
024
800
030
1000
036
1200
042
1400
048
1600
060
2000
5
ECONOMIZER
FILTER RACK
MANUAL OUTSIDE AIR DAMPER
REPLACEMENT
PANEL
MANUAL OUTSIDE
AIR HOOD
DAMPER
BLADE
7
6
Base unit dimensions—50JZ024-036
REQ’D CLEARANCES FOR OPERATION AND SERVICING. IN. (MM)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. IN. (MM)
EVAPORATOR COIL ACCESS SIDE . . . . . . . . . . . . . 36 (914)
POWER ENTRY SIDE (EXCEPT FOR NEC REQUIREMENTS) . . 36 (914)
UNIT TOP. . . . . . . . . . . . . . . . . . . . . . . . . . 48 (1219)
SIDE OPPOSITE DUCTS . . . . . . . . . . . . . . . . . . . 36 (914)
DUCT PANEL . . . . . . . . . . . . . . . . . . . . . . . 12 (304.8)*
TOP OF UNIT . . . . . . . . . . . . . . . . . . . . . . . 14 (355.6)
DUCT SIDE OF UNIT. . . . . . . . . . . . . . . . . . . . . 2 (50.8)
SIDE OPPOSITE DUCTS . . . . . . . . . . . . . . . . . . 14 (355.6)
BOTTOM OF UNIT . . . . . . . . . . . . . . . . . . . . . 0.50 (12.7)
ELECTRIC HEAT PANEL . . . . . . . . . . . . . . . . . . 36 (914.4)
NEC REQ’D CLEARANCES. IN. (MM)
BETWEEN UNITS, POWER ENTRY SIDE . . . . . . . . . . 42 (1066.8)
UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE . . 36 (914)
UNIT AND BLOCK OF CONCRETE WALLS AND OTHER
GROUNDED SURFACES, CONTROL BOX SIDE . . . . . . . 42 (1066.8)
*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 12 IN. (304.8 MM) FROM
WALL SYSTEM, THEN THE SYSTEM PERFORMANCE MAY BE COMPROMISED.
LEGEND
CG - CENTER OF GRAVITY
COND - CONDENSER
EVAP - EVAPORATOR
NEC - NATIONAL ELECTRICAL CODE
REQ'D - REQUIRED
NOTE: DIMENSIONS ARE IN IN. (MM)
44.5 [1.75]
CENTER OF GRAVITY
in. [mm]
kg
UNIT HEIGHT
in. [mm]
“A”
X
Y
Z
135.6
35.02 [889.5]
19.0 [482.6]
18.3 [463.6]
16.0 [406.4]
320
145.2
37.02 [940.3]
20.0 [508.0]
19.3 [489.0]
17.6 [447.0]
328
148.8
37.02 [940.3]
20.0 [508]
19.0 [482.6]
16.5 [419.1]
UNIT WEIGHT
UNIT
ELECTRICAL
CHARACTERISTICS
lb
50JZ024
208/230-1-60
299
50JZ030
208/230-1-60, 208/230-3-60
50JZ036
208/230-1-60, 208/230-3-60, 460-3-60
50JZ 024-036 Dimensions
7
Base unit dimensions—50JZ042-060
REQUIRED CLEARANCE FOR OPERATION AND SERVICING
REQUIRED CLEARANCE TO COMBUSTIBLE MA TL.
in. [mm]
EVAP. COIL ACCESS SIDE..............................................................36.00 [914.0]
POWER ENTRY SIDE......................................................................36.00 [914.0]
(EXCEPT FOR NEC REQUIREMENTS)
UNIT TOP .......................................................................................48.00 [1219.0]
SIDE OPPOSITE DUCTS ................................................................36.00 [914.0]
DUCT PANEL ...................................................................................12.00 [304.8] *
in. [mm]
TOP OF UNIT...................................................................................14.00 [355.6]
DUCT SIDE OF UNIT.........................................................................2.00 [50.8]
SIDE OPPOSITE DUCTS ................................................................14.00 [355.6]
BOTTOM OF UNIT .............................................................................0.50 [12.7]
ELECTRIC HEAT PANEL .................................................................36.00 [914.4]
*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 12.00 [304.8] FROM
WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.
in. [mm]
BETWEEN UNITS, POWER ENTRY SIDE ....................................42.00 [1066.8]
UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE ...36.00 [914.0]
UNIT AND BLOCK OR CONCRETE WALLS AND OTHER
GROUNDED SURFACES, POWER ENTRY SIDE.........................42.00 [1066.8]
NEC. REQUIRED CLEARANCES.
44.5 [1.75]
8
kg
X
Y
Z
158.8
40.98 [1040.9]
21.0 [533.4]
20.5 [520.7]
16.6 [421.6]
355
161.0
40.98 [1040.9]
20.0 [508.0]
21.3 [539.8]
18.0 [457.2]
428
194.1
42.98 [1091.7]
21.0 [533.4]
20.0 [508.0]
17.6 [447.0]
ELECTRICAL
CHARACTERISTICS
lb
50JZ042
208/230-1-60, 208/230-3-60, 460-3-60
350
50JZ048
208-230-1-60, 208/230-3/60, 460-3-60
50JZ060
208/230-1-60, 208/230-3-60, 460-3-60
50JZ 042-060 Dimensions
CENTER OF GRAVITY
in. [mm]
UNIT HEIGHT
in. [mm]
“A”
UNIT WEIGHT
UNIT
Accessory dimensions
ODS CATALOG
ORDERING NO.
UNIT SIZE
50JZ024-036
FLAT CURB
50JZ042-060
A
in. [mm]
B
in. [mm]
C
in. [mm]
D
in. [mm]
CPRFCURB006A00
8 [203]
11-27/32 [301]
30-5/8 [778]
28-3/4 [730]
CPRFCURB007A00
14 [356]
11-27/32 [301]
30-5/8 [778]
28-3/4 [730]
CPRFCURB008A00
8 [203]
15-27/32 [402]
42-1/8 [1070]
40-1/4 [1022]
CPRFCURB009A00
14 [356]
15-27/32 [402]
42-1/8 [1070]
40-1/4 [1022]
NOTES:
1. Roof curb must be set up for unit being installed.
2. Seal strip must be applied as required to unit being installed.
3. Dimensions in [ ] are in millimeters.
4. Roof curb is made of 16 gage steel.
5. Table lists only the dimensions per part number that have changed.
6. Attach ductwork to curb (Flanges of duct rest on curb).
7. Insulated panels: 1-in. thick fiberglass 1 lb density.
8. Dimensions are in inches.
SIDE PANEL
0.75"
SUPPORT RIB(S)
3.0"
BASE PAN
BOTTOM SUPPLY
4.0"
SEAL STRIP
(FACTORY SUPPLIED)
COUNTER FLASHING
(FIELD SUPPLIED)
NAILER
ROOFING FELT
(FIELD SUPPLIED)
INSULATION
(FIELD SUPPLIED)
CANT STRIP
(FIELD SUPPLIED)
ROOFING MATERIAL
(FIELD SUPPLIED)
Full Perimeter Curb
9
Selection Procedure
I Determine cooling and heating requirements at design
conditions:
Given:
Required Cooling Capacity (TC) . . . . . . . . . 33,500 Btuh
Sensible Heat Capacity (SHC) . . . . . . . . . . . 24,500 Btuh
Required Heating Capacity . . . . . . . . . . . . . . 25,000 Btuh
Condenser Entering Air Temperature . . . . . . . . . . . . 95°F
Indoor-Air Temperature . . . . . . . . . . 80°F edb, 67°F ewb
Evaporator Air Quantity . . . . . . . . . . . . . . . . . . .1200 cfm
External Static Pressure. . . . . . . . . . . . . . . . . . . 0.2 in. wg
Electrical Characteristics. . . . . . . . . . . . . . . . . . . 208-1-60
II Select unit based on required cooling capacity.
Enter Net Cooling Capacities table at condenser entering
temperature of 95°F. The 50JZ036 unit at 1200 cfm and
67°F ewb (entering wet bulb) will provide a total capacity
of 36,600 Btuh and a SHC of 28,200 Btuh. Calculate SHC
correction, if required, using Note 4 under Cooling
Capacities tables.
III Select electric heat.
Enter the 50JZ036 unit Heating Extended Performance
table at 1200 cfm. At 70°F return indoor air and 20°F air
entering outdoor coil, the integrated heating capacity is
17,400 Btuh. (Select 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 25,000 Btuh. Therefore,
7,600 Btuh (25,000 – 17,400) additional electric heat is
required
Determine additional electric heat capacity in kw.
7,600 Btuh
= 2.2 kw of heat required
3414 Btuh/kW
10
Enter the Electric Heater table on page 5 for 208/230 v,
single-phase, unit. The 5-kw heater at 240v most closely
satisfies the heating required. To calculate kw at 230v,
multiply the heater kw by multiplication factor 0.92 found
in the Multiplication Factors table on page 17.
5 kw x 0.92 = 4.6 kw
4.6 kw x 3414 Btuh/kw = 15,704 Btuh
Total unit heating capacity is 33,104 Btuh (17,400 +
15,704).
IV Determine fan speed and power requirements at design
conditions.
Before entering the air delivery tables, calculate the total
static pressure required. From the given, Filter Pressure
Drop Table, Electrical Heat Pressure Drop table, and the
Wet Coil Pressure Drop table, find:
External static pressure
0.200 in. wg
Filter
0.130 in. wg
Electric Heaters
0.000 in. wg
Total static pressure
0.330 in. wg
Enter the table for Wet Coil Air Delivery — Horizontal
Discharge, 230 and 460v. At 0.33 in. wg external static
pressure and medium speed, the motor delivers 1171 cfm,
and 467 watts. Adjusting for 208v, the motor delivers 1054
cfm (deduct 10%) and 420 watts.
V Select unit that corresponds to power source available.
The Electrical Data table shows that the unit is designed to
operate at 208-1-60.
Performance data
COOLING EXTENDED PERFORMANCE TABLE
50JZ024 COOLING PERFORMANCE TABLE
Evaporator Air—CFM/BF
Temp (F)
Outdoor Air
Entering
Condenser
75
85
95
105
115
125
700/0.10
800/0.14
900/0.18
Evaporator Air — Ewb (F)
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
62
63*
67
72
62
63*
67
72
62
63*
67
72
24.1
21.3
1.86
22.8
20.6
2.05
21.5
19.9
2.26
18.5
17.6
2.54
17.0
16.6
2.80
15.4
15.3
3.09
42.7
17.6
1.86
23.7
17.2
2.06
22.2
16.5
2.26
19.3
14.8
2.53
17.4
13.9
2.80
15.7
13.0
3.11
26.6
18.2
1.87
25.1
17.4
2.06
23.3
16.4
2.27
20.0
14.4
2.55
18.4
13.6
2.81
16.7
12.8
3.10
28.6
14.6
1.89
26.9
13.9
2.08
24.7
12.8
2.29
21.1
11.1
2.57
19.4
10.4
2.82
17.6
9.6
3.11
25.1
23.2
1.87
23.7
22.3
2.06
22.1
21.2
2.26
19.0
18.7
2.55
17.5
17.5
2.80
16.0
16.0
3.06
25.7
18.9
1.87
24.2
18.1
2.06
22.5
17.3
2.27
19.4
15.4
2.53
17.7
14.5
2.81
15.9
13.7
3.12
27.4
19.4
1.88
25.7
18.5
2.06
23.8
17.3
2.28
20.4
15.1
2.56
18.7
14.3
2.82
16.9
13.5
3.13
29.1
15.2
1.89
27.4
14.4
2.08
25.1
13.3
2.29
21.5
11.6
2.58
19.8
10.8
2.80
17.8
9.9
3.14
25.6
24.5
1.87
24.1
23.4
2.06
22.5
22.1
2.27
19.4
19.3
2.55
17.9
17.9
2.81
16.4
16.4
3.10
26.1
19.9
1.87
24.6
19.1
2.06
22.8
18.1
2.27
19.6
16.0
2.54
17.9
15.1
2.81
16.1
14.3
3.12
27.8
20.3
1.88
26.1
19.3
2.07
24.1
18.0
2.28
20.6
15.7
2.56
18.9
14.8
2.82
17.1
14.0
3.13
29.5
15.7
1.90
27.7
14.9
2.09
25.4
13.7
2.30
21.7
11.9
2.58
19.8
11.0
2.82
17.8
10.1
3.14
HEATING EXTENDED PERFORMANCE TABLE -10–20
50JZ024
Return
Air (F db)
700
60
800
900
700
70
800
900
700
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
800
900
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
-10
7.1
0
6.5
9.5
1.53
9.7
1.57
5.9
9.0
9.2
1.75
8.0
1.86
10.5
7.5
10.9
5.3
8.4
1.91
7.7
11.0
14.9
11.5
12.9
13.5
10.1
11.8
13.2
12.2
2.16
13.9
2.11
2.04
13.4
1.92
2.13
9.9
13.2
1.93
12.6
12.6
2.04
1.98
14.6
1.90
9.7
12.9
1.95
12.4
13.9
2.05
1.97
14.3
1.91
10.9
14.0
1.76
12.1
13.6
1.86
7.4
8.2
1.90
5.8
11.8
1.96
5.2
5.6
8.4
15.5
1.93
10.6
13.7
1.77
13.2
13.3
1.86
1.80
5.1
5.5
11.6
15.2
1.74
10.4
13.4
1.79
13.0
14.4
1.87
8.3
14.9
1.75
11.4
11.3
1.79
6.1
6.6
14.3
1.69
8.0
20
12.7
1.76
11.2
12.4
1.79
1.73
14.0
1.68
9.1
8.8
1.72
6.4
12.2
1.64
5.7
6.2
8.9
9.8
1.59
17
10.9
1.69
1.63
6.7
7.3
12.0
1.61
6.6
7.1
10
8.7
12.5
2.12
12.0
14.2
2.10
12.8
2.11
HEATING EXTENDED PERFORMANCE TABLE 30–60
50JZ024
Return
Air (F db)
700
60
800
900
700
70
800
900
700
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
800
900
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
30
18.1
40
15.8
21.7
1.90
22.1
1.86
15.7
21.4
21.8
1.98
20.5
2.27
20.8
23.7
21.2
24.1
24.1
24.6
27.8
28.5
28.5
2.70
24.9
2.47
27.8
2.76
24.6
24.9
28.9
2.36
2.50
24.1
2.42
28.9
2.56
23.7
28.6
2.42
25.5
24.1
2.46
21.2
2.28
28.6
2.24
23.3
27.7
2.47
25.2
25.5
2.51
2.31
15.5
2.15
23.3
27.7
2.28
24.7
28.3
2.11
24.8
25.2
2.22
20.5
20.8
2.17
17.6
24.7
2.37
15.2
17.4
21.8
28.3
2.34
24.4
28.1
2.14
25.5
24.8
2.24
2.10
14.7
16.7
24.4
28.1
2.01
23.9
27.9
2.22
25.3
25.5
2.29
21.4
27.9
2.05
25.0
23.9
2.13
16.0
18.3
25.3
2.01
21.1
60
25.3
2.12
24.7
25.0
2.16
2.00
25.3
2.04
22.4
21.1
2.03
17.9
24.7
1.92
15.4
17.6
22.1
22.4
1.82
50
24.4
2.09
1.94
16.6
18.9
24.4
1.99
16.2
18.5
47
21.7
28.7
28.7
2.62
*At 75°F entering dry bulb—Tennessee Valley Authority [TVA] rating conditions; all others at 80°F entering dry bulb.
See Legend and Notes on page 17.
11
Performance data (cont)
COOLING EXTENDED PERFORMANCE TABLE
50JZ030 COOLING PERFORMANCE TABLE
Evaporator Air—CFM/BF
Temp (F)
Outdoor Air
Entering
Condenser
75
85
95
105
115
125
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
875/0.08
1000/0.09
1125/0.10
Evaporator Air — Ewb (F)
62
63*
67
72
62
63*
67
72
62
63*
67
72
28.1
26.0
2.17
26.3
24.7
2.39
24.9
23.7
2.65
23.4
22.5
2.92
21.7
21.4
3.24
19.9
19.9
3.57
28.5
21.2
2.25
26.8
20.4
2.49
25.4
19.6
2.75
22.2
17.2
2.99
19.0
14.7
3.23
19.3
17.4
3.65
30.8
21.8
2.19
29.6
21.5
2.44
27.9
21.0
2.69
26.1
20.2
2.98
24.2
19.4
3.28
22.1
18.1
3.60
33.2
17.4
2.21
32.1
17.1
2.45
30.9
16.7
2.71
29.2
16.2
2.99
27.4
15.5
3.28
25.1
14.6
3.62
29.1
28.2
2.18
27.0
26.6
2.38
25.7
25.7
2.67
24.3
24.3
2.94
22.9
22.9
3.25
21.3
21.3
3.58
29.5
22.8
2.26
27.7
22.0
2.50
25.9
21.1
2.76
23.1
19.0
3.02
20.3
16.8
3.27
19.9
18.5
3.67
31.8
23.3
2.20
30.5
23.1
2.44
28.9
22.7
2.71
26.9
21.9
2.99
24.9
21.0
3.29
22.6
19.8
3.61
33.7
18.0
2.21
32.8
17.9
2.45
31.5
17.5
2.71
29.8
17.1
3.00
27.8
16.4
3.30
25.5
15.6
3.62
30.5
30.5
2.19
29.4
29.4
2.43
28.3
28.3
2.71
26.5
26.5
2.98
24.7
24.7
3.29
22.9
22.9
3.62
30.5
25.3
2.26
29.0
25.1
2.52
27.0
24.2
2.78
25.0
22.8
3.06
22.9
21.8
3.37
21.0
21.0
3.71
32.8
25.3
2.20
31.4
25.3
2.44
29.8
25.4
2.70
27.9
24.7
2.99
25.8
23.8
3.30
23.5
22.7
3.62
34.5
18.9
2.22
33.4
18.8
2.46
32.1
18.6
2.72
30.5
18.4
3.00
28.5
17.9
3.30
26.1
17.1
3.62
HEATING EXTENDED PERFORMANCE TABLE -10–20
50JZ030
Return
Air (F db)
875
60
1000
1125
875
70
1000
1125
875
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
1000
1125
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
-10
7.7
0
6.5
10.8
1.93
11.0
1.90
6.1
10.3
10.3
2.09
9.3
2.30
12.5
8.0
12.7
5.3
9.5
2.28
8.1
12.8
17.4
13.7
15.2
16.2
11.8
13.9
15.5
14.6
2.60
16.4
2.53
2.43
15.7
2.23
2.59
11.6
15.6
2.27
14.8
15.0
2.46
2.35
17.3
2.20
11.5
15.4
2.37
14.7
16.2
2.51
2.37
17.0
2.24
12.5
16.3
2.03
14.4
16.1
2.21
7.9
9.4
2.28
6.2
13.6
2.40
5.2
6.1
8.8
18.1
2.35
12.4
16.2
2.07
15.4
15.8
2.24
2.15
5.1
6.1
13.5
18.0
2.00
12.2
16.1
2.11
15.3
16.9
2.29
8.8
17.9
2.04
13.1
13.3
2.11
6.0
7.1
16.8
2.00
8.6
20
15.2
2.08
13.0
14.3
2.20
1.98
16.6
2.04
9.4
10.1
2.11
7.2
14.2
1.94
5.9
6.9
9.3
11.0
1.89
17
12.9
2.08
1.97
6.6
7.8
14.0
2.00
6.6
7.8
10
9.2
14.8
2.54
14.1
16.7
2.42
15.0
2.45
HEATING EXTENDED PERFORMANCE TABLE 30–60
50JZ030
Return
Air (F db)
875
60
1000
1125
875
70
1000
1125
875
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
1000
1125
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
30
40
19.2
22.0
26.3
2.22
26.5
2.16
18.7
25.9
26.0
2.32
25.0
2.65
25.3
28.5
25.4
28.8
29.7
29.9
34.5
34.7
34.7
3.09
30.2
2.84
*At 75°F entering dry bulb—Tennessee Valley Authority [TVA] rating conditions; all others at 80°F entering dry bulb.
See Legend and Notes on page 17.
12
34.5
3.23
29.9
30.2
35.2
2.70
2.92
28.8
2.79
35.2
3.02
28.5
35.1
2.78
30.8
29.7
2.86
25.4
2.67
35.1
2.58
28.2
34.7
2.88
30.6
30.8
2.95
2.74
18.2
2.54
28.2
34.7
2.66
29.5
35.2
2.43
30.4
30.6
2.55
25.0
25.3
2.59
20.7
29.5
2.82
18.0
20.6
26.0
35.2
2.76
29.3
35.2
2.51
30.9
30.4
2.62
2.44
17.9
20.4
29.3
35.2
2.32
29.0
35.0
2.61
30.8
30.9
2.70
25.9
35.0
2.39
29.8
29.0
2.50
18.8
21.4
30.8
2.30
25.7
60
30.7
2.48
29.7
29.8
2.58
2.37
30.7
2.36
26.6
25.7
2.43
21.3
29.7
2.22
18.5
21.1
26.5
26.6
2.12
50
29.7
2.46
2.28
19.5
22.2
29.7
2.35
19.4
22.1
47
26.3
34.9
34.9
2.99
Performance data (cont)
COOLING EXTENDED PERFORMANCE TABLE
50JZ036 COOLING PERFORMANCE TABLE
Evaporator Air—CFM/BF
Temp (F)
Outdoor Air
Entering
Condenser
75
85
95
105
115
125
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
1050/0.07
1200/0.08
1350/0.10
Evaporator Air — Ewb (F)
62
63*
67
72
62
63*
67
72
62
63*
67
72
35.9
32.7
2.66
33.9
31.9
2.91
31.7
30.5
3.16
28.5
27.9
3.52
26.1
26.0
3.85
23.9
23.9
4.26
36.2
26.5
2.76
34.0
25.5
3.04
31.6
24.3
3.32
28.0
22.3
3.69
25.4
21.1
4.00
22.2
19.5
4.41
39.8
27.7
2.70
38.0
27.3
2.98
36.1
26.6
3.31
32.0
24.3
3.67
29.0
22.9
4.01
26.0
21.5
4.40
42.4
22.2
2.70
41.4
22.0
2.98
39.8
21.4
3.29
36.1
19.8
3.70
33.5
18.8
4.05
29.9
17.4
4.48
37.0
35.2
2.76
35.0
34.4
3.01
32.7
32.7
3.25
29.7
29.7
3.62
27.5
27.5
3.96
25.2
25.2
4.38
37.1
28.1
2.87
34.8
27.2
3.17
32.3
25.9
3.45
28.7
23.8
3.82
25.9
22.5
4.15
22.6
20.9
4.51
40.5
29.0
2.80
38.9
28.9
3.09
36.6
28.2
3.40
32.7
26.1
3.81
29.6
24.5
4.13
26.5
23.1
4.52
42.8
22.9
2.81
41.9
22.7
3.09
40.3
22.3
3.40
36.6
20.8
3.81
33.8
19.7
4.18
30.4
18.4
4.60
37.6
36.7
2.87
35.9
35.6
3.11
33.9
33.9
3.39
30.6
30.6
3.78
28.3
28.3
4.11
25.8
25.8
4.54
37.2
29.1
3.03
35.0
28.4
3.32
32.5
27.1
3.60
28.8
25.0
3.97
26.0
23.6
4.28
23.0
21.9
4.64
40.5
29.8
2.96
39.0
29.9
3.25
36.8
29.4
3.55
32.9
27.4
3.95
29.8
25.9
4.29
26.6
24.2
4.66
42.8
23.2
2.96
41.9
23.1
3.25
40.3
22.8
3.56
36.6
21.3
3.97
33.7
20.3
4.33
30.3
19.1
4.76
HEATING EXTENDED PERFORMANCE TABLE -10–20
50JZ036
Return
Air (F db)
1050
60
1200
1350
1050
70
1200
1350
1050
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
1200
1350
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
-10
7.2
0
6.1
11.2
2.43
11.5
2.47
5.6
10.5
10.8
2.72
9.2
2.86
13.2
8.0
13.5
4.8
9.7
2.94
8.2
13.8
19.7
14.8
16.7
17.8
12.6
15.2
17.0
16.1
3.03
18.2
3.02
3.01
17.7
2.81
3.01
12.4
17.4
2.79
16.5
16.3
2.98
2.98
19.3
2.79
12.1
17.1
2.79
16.2
18.1
2.97
2.94
19.0
2.78
13.6
18.5
2.60
15.9
17.8
2.77
7.8
9.5
2.90
5.6
14.8
2.91
4.6
5.4
9.2
20.6
2.77
13.3
18.2
2.57
17.3
17.4
2.75
2.75
4.4
5.2
14.5
20.2
2.57
13.1
18.0
2.56
17.0
19.0
2.73
9.0
19.9
2.55
14.5
14.2
2.71
5.7
6.7
18.7
2.56
8.7
20
16.7
2.54
14.3
15.8
2.68
2.68
18.4
2.53
10.0
10.3
2.64
6.5
15.6
2.53
5.4
6.3
9.8
11.7
2.51
17
14.0
2.51
2.50
6.5
7.6
15.3
2.47
6.3
7.4
10
9.5
16.4
3.03
15.5
18.6
3.03
16.7
3.05
HEATING EXTENDED PERFORMANCE TABLE 30–60
50JZ036
Return
Air (F db)
1050
60
1200
1350
1050
70
1200
1350
1050
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
1200
1350
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
30
25.1
40
22.0
30.9
2.65
31.4
2.65
21.5
30.6
31.0
2.86
28.8
3.10
29.3
34.1
29.7
34.6
35.2
35.8
42.2
42.8
*At 75°F entering dry bulb—Tennessee Valley Authority [TVA] rating conditions; all others at 80°F entering dry bulb.
See Legend and Notes on page 17.
42.8
3.60
36.3
3.40
42.2
3.68
35.8
36.3
43.6
3.23
3.42
34.6
3.35
43.6
3.45
34.1
43.2
3.27
37.4
35.2
3.37
29.7
3.20
43.2
3.14
33.5
42.7
3.34
36.9
37.4
3.40
3.20
20.9
3.09
33.5
42.7
3.17
35.7
43.9
2.94
36.3
36.9
3.12
28.8
29.3
3.09
23.8
35.7
3.21
20.5
23.4
31.0
43.9
3.21
35.2
43.2
2.96
37.7
36.3
3.13
3.00
20.1
22.9
35.2
43.2
2.86
34.6
42.8
3.02
37.3
37.7
3.16
30.6
42.8
2.88
36.1
34.6
2.99
21.8
24.9
37.3
2.85
30.1
60
36.9
2.92
35.8
36.1
3.00
2.85
36.9
2.86
31.8
30.1
2.85
24.5
35.8
2.79
21.1
24.1
31.4
31.8
2.67
50
35.2
2.89
2.79
22.6
25.8
35.2
2.80
22.3
25.5
47
30.9
43.2
43.2
3.55
13
Performance data (cont)
COOLING EXTENDED PERFORMANCE TABLE
50JZ042 COOLING PERFORMANCE TABLE
Evaporator Air—CFM/BF
Temp (F)
Outdoor Air
Entering
Condenser
75
85
95
105
115
125
1225/0.11
1400/0.12
1575/0.14
Evaporator Air — Ewb (F)
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
62
67
72
62
67
72
62
67
72
41.2
37.4
3.08
39.1
36.3
3.39
36.0
34.4
3.68
32.9
31.9
4.16
30.9
30.4
4.59
28.6
28.2
5.07
44.8
31.4
3.10
42.9
30.8
3.42
40.7
29.8
3.76
36.9
27.8
4.21
33.7
26.2
4.61
30.5
24.7
5.07
47.0
24.8
3.11
45.9
24.3
3.44
44.0
23.6
3.81
39.6
21.6
4.22
36.4
20.3
4.62
32.8
18.8
5.08
42.5
40.2
3.09
40.3
39.1
3.41
38.1
38.1
3.75
34.5
34.5
4.20
32.2
32.2
4.62
29.6
29.6
5.08
45.7
33.3
3.11
43.9
32.8
3.42
41.7
31.8
3.76
37.9
29.9
4.20
34.4
28.1
4.61
31.1
26.5
5.06
47.6
25.8
3.12
46.5
25.3
3.44
44.5
24.6
3.82
40.1
22.7
4.23
36.9
21.3
4.63
33.2
19.7
5.09
43.3
42.2
3.10
41.3
40.8
3.42
39.3
39.3
3.76
35.8
35.8
4.20
33.2
33.2
4.61
30.5
30.5
5.07
46.1
34.6
3.11
44.4
34.1
3.46
42.2
33.5
3.76
38.2
31.3
4.20
34.9
29.6
4.60
31.5
27.9
5.06
48.0
26.5
3.13
46.8
26.1
3.45
44.7
25.5
3.81
40.5
23.5
4.23
37.1
22.1
4.63
33.4
20.4
5.09
HEATING EXTENDED PERFORMANCE TABLE -10–20
50JZ042
Return
Air (F db)
1225
60
1400
1575
1225
70
1400
1575
1225
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
1400
1575
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
-10
11.6
0
9.9
15.6
2.36
15.9
2.39
9.6
15.3
15.5
2.65
14.2
2.86
18.2
12.3
18.6
9.1
14.8
2.92
12.6
18.9
24.3
19.5
21.7
22.9
17.4
10.8
22.1
20.6
3.43
23.3
3.36
3.24
21.9
3.10
3.37
17.1
21.6
3.10
20.7
21.3
3.23
3.08
24.0
3.06
16.7
21.3
3.11
20.4
22.7
3.23
3.06
23.6
3.05
18.0
22.6
2.83
20.1
22.4
2.95
12.0
14.5
2.88
10.7
19.6
3.05
8.9
10.4
13.2
25.1
3.06
17.7
22.3
2.82
21.4
22.0
2.94
2.80
8.6
10.1
19.3
24.7
2.79
17.4
21.9
2.82
21.1
23.5
2.94
13.0
24.3
2.78
18.6
18.9
2.78
9.8
11.5
23.2
2.69
12.7
20
20.7
2.78
18.3
20.2
2.77
2.62
22.7
2.67
13.8
14.9
2.59
11.2
19.9
2.55
9.3
10.9
13.5
16.2
2.42
17
18.0
2.67
2.53
10.3
12.1
19.6
2.51
10.1
11.9
10
13.3
21.0
3.42
20.1
23.7
3.36
21.3
3.41
HEATING EXTENDED PERFORMANCE TABLE 30–60
50JZ042
Return
Air (F db)
1225
60
1400
1575
1225
70
1400
1575
1225
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
1400
1575
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
30
29.5
40
25.9
35.4
2.97
35.9
2.95
25.7
35.0
35.4
3.26
33.8
3.63
34.2
39.2
34.6
39.6
40.3
40.9
47.5
47.7
47.7
4.33
41.3
4.02
*At 75°F entering dry bulb—Tennessee Valley Authority [TVA] rating conditions; all others at 80°F entering dry bulb.
See Legend and Notes on page 17.
14
47.5
4.45
40.9
41.3
48.1
3.85
4.06
39.6
3.96
48.1
4.13
39.2
48.5
3.92
42.0
40.3
4.00
34.6
3.79
48.5
3.65
38.6
48.1
4.01
42.0
42.0
4.06
3.82
25.4
3.59
38.6
48.1
3.70
40.5
48.3
3.48
41.3
42.0
3.60
33.8
34.2
3.61
29.0
40.5
3.87
24.9
28.5
35.4
48.3
3.74
40.1
48.6
3.53
42.3
41.3
3.62
3.44
24.5
27.9
40.1
48.6
3.31
39.6
48.0
3.60
42.4
42.3
3.69
35.0
48.0
3.34
40.8
39.6
3.45
26.0
29.7
42.4
3.26
34.5
60
41.9
3.38
40.7
40.8
3.49
3.26
41.9
3.29
36.3
34.5
3.29
29.3
40.7
3.12
25.3
28.9
35.9
36.3
2.95
50
40.3
3.32
3.14
26.6
30.3
40.3
3.16
26.3
30.0
47
35.4
47.7
47.7
4.26
Performance data (cont)
COOLING EXTENDED PERFORMANCE TABLE
50JZ048 COOLING PERFORMANCE TABLE
Evaporator Air—CFM/BF
Temp (F)
Outdoor Air
Entering
Condenser
75
85
95
105
115
125
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
1400/0.07
1600/0.08
1800/0.09
Evaporator Air — Ewb (F)
62
63*
67
72
62
63*
67
72
62
63*
67
72
48.0
44.5
3.50
45.7
43.3
3.86
43.5
41.9
4.25
39.4
38.3
4.72
36.5
36.5
5.25
33.5
33.5
5.80
48.3
35.8
3.70
46.4
35.0
4.07
40.9
30.4
4.26
38.0
29.5
5.02
34.1
27.2
5.48
25.4
19.8
5.69
52.1
37.5
3.58
50.0
36.3
3.97
47.4
35.1
4.40
43.0
32.8
4.93
39.4
31.0
5.42
35.9
29.4
6.00
55.9
29.3
3.62
54.1
28.8
4.00
51.8
28.0
4.43
47.0
25.9
4.97
43.6
24.5
5.47
39.8
23.0
6.04
49.0
47.5
3.64
46.8
46.3
3.99
44.8
44.8
4.41
40.5
40.5
4.89
37.8
37.8
5.39
34.9
34.9
5.98
49.1
37.8
3.89
46.5
36.6
4.30
41.9
33.0
4.57
38.4
31.1
5.17
33.0
27.3
5.57
27.8
23.5
6.03
53.0
39.3
3.76
50.8
38.5
4.15
48.1
37.3
4.57
43.8
35.1
5.10
40.0
33.1
5.60
36.3
31.4
6.18
56.3
30.4
3.79
54.5
29.9
4.17
52.3
29.1
4.60
47.4
27.0
5.15
43.9
25.6
5.64
40.0
24.2
6.22
49.8
49.1
3.81
47.7
47.4
4.17
45.6
45.6
4.59
41.3
41.3
5.11
38.5
28.5
5.62
35.5
35.5
6.20
49.1
39.4
4.13
46.5
38.2
4.53
42.9
35.7
4.88
38.8
33.5
5.45
34.6
30.7
5.87
30.2
27.8
6.37
53.0
40.8
4.00
50.7
40.2
4.39
48.1
39.0
4.80
43.8
36.6
5.33
40.0
34.7
5.83
36.3
32.9
6.38
56.1
31.0
4.02
54.4
30.7
4.41
52.3
30.0
4.84
47.4
27.9
5.39
43.9
26.5
5.85
40.0
25.0
6.47
HEATING EXTENDED PERFORMANCE TABLE -10–20
50JZ048
Return
Air (F db)
1400
60
1600
1800
1400
70
1600
1800
1400
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
1600
1800
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
-10
15.0
0
12.7
19.6
2.93
20.2
2.89
11.6
18.5
19.1
3.11
16.1
3.40
21.2
14.1
21.6
9.7
17.2
3.47
14.6
23.1
29.7
22.4
25.4
26.1
21.2
23.2
26.3
23.6
3.98
27.1
3.83
3.56
26.8
3.47
3.92
19.8
25.9
3.56
25.5
24.5
3.75
3.51
28.8
3.43
19.5
25.0
3.66
24.7
27.9
3.78
3.57
27.7
3.51
22.2
28.1
3.18
23.8
27.1
3.34
13.7
16.6
3.40
11.4
24.2
3.59
9.9
11.6
16.3
31.1
3.61
21.5
27.2
3.26
26.8
26.2
3.44
3.23
9.4
11.1
23.4
30.2
3.14
20.9
26.4
3.36
26.0
29.4
3.49
15.8
29.3
3.21
23.7
22.8
3.29
11.9
14.0
28.5
3.09
15.0
20
25.2
3.31
23.0
25.8
3.35
3.13
27.7
3.15
17.7
17.6
3.20
13.7
25.0
2.96
10.6
12.5
17.2
20.8
2.83
17
22.2
3.23
3.02
13.5
15.9
24.2
3.08
13.1
15.5
10
16.6
24.4
3.88
23.9
27.9
3.74
25.2
3.79
HEATING EXTENDED PERFORMANCE TABLE 30–60
50JZ048
Return
Air (F db)
1400
60
1600
1800
1400
70
1600
1800
1400
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
1600
1800
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
30
34.6
40
30.3
39.7
3.53
41.0
3.41
30.1
40.0
41.3
3.62
37.2
4.18
38.6
43.2
39.9
44.6
43.2
44.6
48.1
49.5
49.5
4.61
46.0
4.28
48.1
4.81
44.6
46.0
50.7
4.02
4.43
44.6
4.23
50.7
4.61
43.2
49.6
4.18
47.0
43.2
4.38
39.9
4.08
49.6
3.90
41.7
48.3
4.37
45.8
47.0
4.54
4.22
29.4
3.94
41.7
48.3
4.04
45.7
50.5
3.64
44.3
45.8
3.86
37.2
38.6
4.05
33.6
45.7
4.40
28.5
32.5
41.3
50.5
4.20
44.4
49.0
3.76
46.5
44.3
3.98
3.74
27.5
31.4
44.4
49.0
3.53
42.9
48.0
3.94
45.6
46.5
4.14
40.0
48.0
3.65
45.8
42.9
3.88
31.0
35.4
45.6
3.50
38.7
60
44.6
3.81
44.7
45.8
4.04
3.73
44.6
3.62
42.2
38.7
3.83
34.4
44.7
3.43
28.9
33.0
41.0
42.2
3.31
50
43.5
3.77
3.54
32.3
36.8
43.5
3.68
31.3
35.7
47
39.7
50.6
50.6
4.43
*At 75°F entering dry bulb—Tennessee Valley Authority [TVA] rating conditions; all others at 80°F entering dry bulb.
See Legend and Notes on page 17.
15
Performance data (cont)
COOLING EXTENDED PERFORMANCE TABLE
50JZ060 COOLING PERFORMANCE TABLE
Evaporator Air—CFM/BF
Temp (F)
Outdoor Air
Entering
Condenser
75
85
95
105
115
125
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
1750/0.07
2000/0.08
2250/0.09
Evaporator Air — Ewb (F)
62
63*
67
72
62
63*
67
72
62
63*
67
72
59.2
54.7
4.55
56.4
53.6
4.97
53.3
52.3
5.41
50.3
50.3
5.90
47.5
47.5
6.47
43.4
41.5
7.18
59.6
43.8
4.75
56.3
42.4
5.21
52.8
40.7
5.72
49.4
39.1
6.24
45.6
37.4
6.80
41.5
35.7
7.34
64.7
46.1
4.62
61.8
44.8
5.08
58.3
43.2
5.57
54.5
41.6
6.10
50.6
40.0
6.65
46.4
38.3
7.22
68.6
36.2
4.67
66.2
35.4
5.12
63.2
34.3
5.60
59.7
33.0
6.13
55.6
31.6
6.69
51.0
29.9
7.27
60.7
58.6
4.72
57.7
57.3
5.11
54.7
54.7
5.49
51.7
51.7
6.24
48.7
48.7
7.00
45.4
45.4
7.25
60.5
46.2
4.98
56.9
44.6
5.45
52.9
42.7
5.98
49.9
41.6
6.46
46.2
39.9
7.02
41.9
38.0
7.63
65.1
48.2
4.85
62.3
47.3
5.31
58.9
46.0
5.79
55.1
44.3
6.31
51.1
42.6
6.84
46.8
40.8
7.43
68.9
37.3
4.89
66.3
36.6
5.33
63.5
35.6
5.83
59.9
34.3
6.35
55.7
32.8
6.90
51.0
31.1
7.48
61.8
60.8
4.94
59.0
58.9
5.35
56.0
56.0
5.78
52.9
52.9
6.42
49.7
49.7
7.08
46.2
46.2
7.51
60.5
48.3
5.25
57.2
46.7
5.70
53.4
45.0
6.21
50.0
43.6
6.72
46.2
42.0
7.27
42.2
40.1
7.83
68.6
50.1
5.14
62.3
49.4
5.59
58.9
48.2
6.04
55.2
46.5
6.56
51.3
45.2
7.07
26.8
43.1
7.65
68.8
38.1
5.17
69.8
37.4
5.61
66.8
36.6
6.10
60.5
35.4
6.62
55.7
33.9
7.17
50.5
32.1
7.75
HEATING EXTENDED PERFORMANCE TABLE -10–20
50JZ060
Return
Air (F db)
1750
60
2000
2250
1750
70
2000
2250
1750
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
2000
2250
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
-10
12.7
0
11.7
20.2
3.61
20.0
3.70
10.6
19.0
19.1
4.07
16.8
4.37
24.3
15.8
24.7
9.0
17.4
4.34
16.1
25.0
34.3
27.0
30.0
31.8
23.6
27.3
30.3
28.7
4.95
32.2
4.80
4.62
30.9
4.38
4.89
23.2
30.6
4.47
29.2
29.6
4.69
4.48
33.9
4.35
22.9
30.2
4.57
28.9
32.0
4.75
4.53
33.5
4.43
25.2
32.3
4.01
28.6
31.7
4.28
15.5
17.1
4.37
9.8
26.7
4.56
8.8
9.5
17.7
35.8
4.52
24.9
32.0
4.09
30.5
31.3
4.32
4.18
8.6
9.3
26.5
35.5
3.98
24.6
31.7
4.21
30.2
33.4
4.40
17.6
35.1
4.05
26.3
26.2
4.18
10.7
11.6
33.2
3.91
17.4
20
30.0
4.15
26.1
27.9
4.23
4.04
32.9
3.96
18.6
18.8
4.06
11.5
27.7
3.81
10.5
11.4
18.5
20.1
3.70
17
26.0
4.01
3.83
11.4
12.3
27.6
3.81
11.3
12.2
10
18.7
29.1
4.85
27.7
32.6
4.72
29.4
4.76
HEATING EXTENDED PERFORMANCE TABLE 30–60
50JZ060
Return
Air (F db)
1750
60
2000
2250
1750
70
2000
2250
1750
80
Air Temperature Entering Outdoor Coil (F db at 70% rh)
CFM (Standard Air)
2000
2250
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
TC
kW
30
42.6
40
37.3
50.5
4.40
51.0
4.22
36.3
49.8
50.3
4.49
47.2
5.14
47.8
55.0
48.3
55.4
56.5
57.2
65.2
65.3
65.3
5.71
57.7
5.34
*At 75°F entering dry bulb—Tennessee Valley Authority [TVA] rating conditions; all others at 80°F entering dry bulb.
See Legend and Notes on page 17.
16
65.2
5.99
57.2
57.7
65.6
4.98
5.49
55.4
5.28
65.6
5.69
55.0
65.7
5.16
59.1
56.5
5.41
48.3
5.11
65.7
4.85
54.0
65.5
5.39
58.6
59.1
5.67
5.24
35.3
4.91
54.0
65.5
4.99
56.6
65.4
4.48
57.9
58.6
4.85
47.2
47.8
5.01
40.2
56.6
5.39
34.9
39.8
50.3
65.4
5.16
56.1
64.1
4.59
59.2
57.9
4.99
4.70
34.5
39.3
56.1
64.1
4.38
55.4
64.4
4.81
58.9
59.2
5.17
49.8
64.4
4.51
57.2
55.4
4.82
36.7
41.9
58.9
4.34
49.2
60
58.5
4.68
57.4
57.2
4.97
4.61
58.5
4.48
51.4
49.2
4.74
41.4
57.4
4.28
35.8
40.9
51.0
51.4
4.12
50
55.9
4.68
4.40
38.2
43.6
55.9
4.55
37.9
43.3
47
50.5
66.6
66.6
5.58
Performance data (cont)
ECONOMIZER 1-in. FILTER PRESSURE DROP (in. wg)
UNIT50JZ
PRESSURE DROP
024-036
0.20
042-060
0.25
MULTIPLICATION FACTORS
HEATER kw
RATING
VOLTAGE
DISTRIBUTION V/3/60
MULTIPLICATION
FACTOR
240
200
208
230
240
.69
.75
.92
1.00
480
440
460
480
.84
.92
1.00
Example: 15.0 kw (at 240v) heater on 208v
= 15.0 (.75 mult factor)
= 11.25 capacity at 208v
BF
Ewb
kW
SHC
TC
Edb
rh
—
—
—
—
—
—
—
—
LEGEND
Ewb – Entering Wet-Bulb
kW – Total Unit Power Input
NOTES:
SHC – Sensible Heat Capacity (1000 Btuh)
TC Ratings
– Total
Capacity
(1000account
Btuh) (net)
1.
are
net; they
for the effects
of
the evaporator-fan motor power and heat.
NOTES:
1. Ratings
net; they account
for the effects
the extrapolate.
evaporator-fan motor power and heat.
2.
Direct are
interpolation
is permissible.
Doofnot
2. Direct
interpolation
is permissible.
extrapolate.
3.
The following
formulas
may Do
be not
used:
3. The following formulas may be used:
sensible capacity (Btuh)
t
= t
2
ldb
edb
1.10 x cfm
LEGEND
Bypass Factor
Entering Wet-Bulb
Total Unit Power Input
Sensible Heat Capacity (1000 Btuh)
Total Capacity (1000 Btuh) (net)
Entering Dry-Bulb
Relative Humidity
Indicates Integrated Ratings
t lwb = Wet-bulb temperature corresponding to enthalpy of air leaving
evaporator coil (h lwb )
hlwb = hewb2
total capacity (Btuh)
4.5 x cfm
Where: h ewb = Enthalpy of air entering evaporator coil
4. The SHC is based on 80°F edb temperature of air entering evaporator
coil. Below 80°F edb, subtract (corr factor x cfm) from SHC.
Above 80°F edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 + BF) x (edb + 80).
5. Integrated capacity is maximum (instantaneous) capacity less the effect
of frost on the outdoor coil and the heat required to defrost it.
ELECTRIC HEAT PRESSURE DROP TABLES
Small Cabinet: 024-036
STATIC
CFM
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
5 Kw
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.02
0.04
0.06
0.07
10 Kw
0.00
0.00
0.00
0.00
0.00
0.02
0.04
0.06
0.07
0.09
0.10
0.11
15 Kw
0.00
0.00
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
20 Kw
0.00
0.00
0.02
0.04
0.06
0.08
0.09
0.11
0.13
0.15
0.17
0.19
Large Cabinet: 042-060
STATIC
CFM
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
5 Kw
0.00
0.00
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
0.11
0.12
10 Kw
0.00
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
0.11
0.12
0.13
15 Kw
0.00
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
0.11
0.12
0.13
0.14
0.15
20 Kw
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
0.11
0.12
0.13
0.14
0.15
0.16
17
WET COIL DELIVERY—HORIZONTAL AND DOWNFLOW DISCHARGE UNIT 50JZ 024-060
230 AND 460 VOLT
Unit
50JZ
Low
024
Med
High
Low
030
Med
High
Low
036
Med
High
Low
042
Med
High
Low
048
Med
High
Low
060
External Static Pressure (in.wg)
Motor Speed
Med
High
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Watts
275
273
271
270
—
—
—
—
—
—
—
Cfm
923
844
754
669
—
—
—
—
—
—
—
Watts
—
—
—
359
353
350
347
341
—
—
—
Cfm
—
—
—
941
876
814
737
622
—
—
—
Watts
—
—
—
—
—
—
447
439
431
423
—
Cfm
—
—
—
—
—
—
968
869
765
659
—
Watts
276
276
272
—
—
—
—
—
—
—
—
Cfm
963
929
781
—
—
—
—
—
—
—
—
Watts
375
377
371
362
354
350
—
—
—
—
—
Cfm
1202
1170
1079
976
884
807
—
—
—
—
—
Watts
—
—
—
—
469
449
435
428
—
—
—
Cfm
—
—
—
—
1174
988
828
718
—
—
—
Watts
462
451
431
411
394
381
—
—
—
—
—
Cfm
1374
1290
1205
1116
1020
916
—
—
—
—
—
Watts
523
506
490
471
449
426
—
—
—
—
—
1408
1301
1190
1082
977
—
—
—
—
—
—
Cfm
1500
Watts
—
645
628
610
595
584
575
—
—
—
Cfm
—
1474
1369
1267
1169
1069
962
—
—
—
—
Watts
660
639
624
611
598
583
564
541
518
495
473
Cfm
1701
1659
1618
1576
1531
1481
1425
1363
1293
1223
1154
Watts
—
—
—
—
—
704
675
645
614
582
550
Cfm
—
—
—
—
—
1701
1631
1550
1460
1361
1256
Watts
—
—
—
—
—
—
—
806
777
749
726
Cfm
—
—
—
—
—
—
—
1708
1614
1521
1435
Watts
620
600
586
574
562
548
530
510
487
—
—
Cfm
1662
1621
1581
1540
1496
1447
1392
1331
1263
—
—
Watts
763
747
729
709
686
661
634
606
577
547
517
1774
1722
1662
1594
1515
1427
1330
1227
Cfm
1917
1868
1822
Watts
—
—
—
852
832
809
784
757
730
704
682
Cfm
—
—
—
1982
1914
1839
1757
1669
1577
1486
1402
Watts
597
592
578
526
460
452
445
—
—
—
—
Cfm
2265
2190
2101
2033
1974
1869
1614
—
—
—
—
Watts
754
730
707
687
671
658
646
630
603
558
486
Cfm
2383
2282
2202
2134
2070
2005
1935
1858
1771
1667
1576
Watts
901
876
856
836
813
785
755
723
696
681
687
Cfm
2480
2383
2301
2233
2175
2122
2066
1998
1910
1788
1619
*Air delivery values are based on operating voltage of 230 v or 460 v, wet coil, without filter or electric heater. Deduct filter and electric heater pressure
drops to obtain static pressure available for ducting.
NOTES:
1. Do not operate the unit at a cooling ariflow that is less than 350 cfm for each 12,000 Btuh of rated cooling capacity. Evaporator coil frosting may
occur at airflows below this point.
2. Dashes indicate portions of table that are beyond the blower motor capacity or are not recommended.
3. Deduct 10% for 208v.
FILTER PRESSURE DROP (In. wg)
UNIT SIZE
50JZ
FILTER SIZE
CFM
500
600
700
800
024, 030
20 X 20 X 1
36
20 X 24 X 1
—
—
—
—
042, 048, 060
24 X 30 X 1
—
—
—
—
18
900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
0.05 0.07 0.08 0.10 0.12 0.13 0.14 0.15
—
—
—
0.09 0.10 0.11 0.13 0.14 0.15 0.16
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18
Typical piping and wiring
ROOF-MOUNTING
CURB
ROOF
RETURN-AIR
FLEXIBLE DUCT
SUPPLY-AIR
FLEXIBLE DUCT
CEILING
CONCENTRIC DIFFUSER BOX
(FIELD-SUPPLIED)
C00023
INDOOR
THERMOSTAT
RETURN
AIR
TOP COVER
FROM
POWER
SOURCE
DISCONNECT
PER NEC*
*NEC - NATIONAL ELECTRICAL CODE
C00063
19
Application data
Condensate trap — A 2-in. condensate trap must be field
supplied.
1” MIN.
TRAP
OUTLET
2” MIN.
Ductwork — Secure downflow discharge ductwork to roof
curb. For horizontal discharge applications, attach ductwork
to unit with flanges.
To convert a unit to downflow discharge — Units are
equipped with factory-installed inserts in the downflow
20
openings. Remove the inserts similar to removing an
electrical knock-out. Leave on duct covers to seal the
horizontal discharge openings in the unit. Units installed in
horizontal discharge orientation do not require duct covers.
Maximum cooling airflow — To minimize the possibility
of condensate blow-off from the evaporator, airflow
through the units should not exceed 450 cfm/ton.
Minimum cooling airflow — The minimum cooling
airflow is 350 cfm/ton.
Minimum cooling ambient operating temperature — All
standard units have a minimum ambient operating
temperature of 40°F. With accessory low ambient temperature
kit, units can operate at temperatures down to 0°F.
Maximum operating outdoor air temperature — Maximum
outdoor operating air temperature for cooling is 125°F.
Electrical data
UNIT
SIZE
50JZ
024
V-PH-Hz
VOLTAGE
RANGE
Min
Max
COMPRESSOR
RLA
LRA
OUTDOOR
INDOOR
FAN MOTOR FAN MOTOR
FLA
FLA
208/230-1-60
187
253
13.5
61.0
0.9
2.0
208/230-1-60
187
253
15.9
73.0
0.9
2.1
208/230-3-60
187
253
10.9
63.0
0.9
2.1
208/230-1-60
187
253
16.9
83.0
1.6
4.1
208/230-3-60
187
253
12.2
77.0
1.6
4.1
460-3-60
414
506
5.8
35.0
0.9
2.0
208/230-1-60
187
253
22.4
105.0
0.9
4.1
208/230-3-60
187
253
15.4
88.0
0.9
4.1
460-3-60
414
506
7.3
39.0
0.9
2.0
208/230-1-60
187
253
21.3
109.0
1.6
4.1
208/230-3-60
187
253
14.7
91.0
1.6
4.1
460-3-60
414
506
7.2
46.0
0.9
2.0
208/230-1-60
187
253
27.6
158.0
1.5
6.2
208/230-3-60
187
253
19.2
137.0
1.5
6.2
460-3-60
414
506
9.0
62.0
0.9
3.2
030
036
042
048
060
See Legend and Notes on p. 22
ELECTRIC HEAT
Nominal kw
FLA
—/—
3.8/5.0
7.5/10.0
—/—
3.8/5.0
7.5/10.0
11.3/15.0
—/—
3.8/5.0
7.5/10.0
11.3/15.0
—/—
3.8/5.0
7.5/10.0
11.3/15.0
—/—
3.8/5.0
7.5/10.0
11.3/15.0
—/—
5.0
10.0
15.0
—/—
3.8/5.0
7.5/10.0
11.3/15.0
15.0/20.0
—/—
3.8/5.0
7.5/10.0
11.3/15.0
15.0/20.0
—/—
5.0
10.0
15.0
20.0
—/—
3.8/5.0
7.5/10.0
11.3/15.0
15.0/20.0
—/—
3.8/5.0
7.5/10.0
11.3/15.0
15.0/20.0
—/—
5.0
10.0
15.0
20.0
—/—
3.8/5.0
7.5/10.0
11.3/15.0
15.0/20.0
—/—
3.8/5.0
7.5/10.0
11.3/15.0
15.0/20.0
—/—
5.0
10.0
15.0
20.0
—/—
18.1/20.8
36.1/41.7
—/—
18.1/20.8
36.1/41.7
54.2/62.5
—/—
10.4/12.0
20.8/24.1
31.3/36.1
—/—
18.1/20.8
36.1/41.7
54.2/62.5
—/—
10.4/12.0
20.8/24.1
31.3/36.1
—/—
6.0
12.0
18.0
—/—
18.1/20.8
36.1/41.7
54.2/62.5
72.2/83.3
—/—
10.4/12.0
20.8/24.1
31.3/36.1
41.6/48.0
—/—
6.0
12.0
18.0
24.1
—/—
18.1/20.8
36.1/41.7
54.2/62.5
72.1/83.3
—/—
10.4/12.0
20.8/24.1
31.3/36.1
41.6/48.0
—/—
6.0
12.0
18.0
24.1
—/—
18.1/20.8
36.1/41.7
54.2/62.5
72.2/83.3
—/—
10.4/12.0
20.8/24.1
31.3/36.1
41.6/48.0
—/—
6.0
12.0
18.0
24.1
POWER SUPPLY†
MAX FUSE
UNIT MCA or CKT. BKR.
19.8/19.8
25.1/28.5
47.6/54.6
22.9/22.9
25.2/28.7
47.8/54.7
70.3/80.8
16.6/16.6
16.6/17.7
28.7/32.7
41.7/47.7
26.8/26.8
27.7/31.2
50.3/57.2
72.8/83.3
21.0/21.0
21.0/21.0
31.2/35.2
44.2/50.2
10.2
10.2
17.5
25.1
33.0/33.0
33.0/33.0
50.3/57.2
72.8/83.3
95.4/109.3
24.3/24.3
24.3/24.3
31.2/35.2
44.2/50.2
57.1/65.1
12.0
12.0
17.5
25.1
32.6
32.3/32.3
32.3/32.3
50.3/57.2
72.8/83.3
95.4/109.3
24.1/24.1
24.1/24.1
31.2/35.2
44.2/50.2
57.1/65.1
11.9
11.9
17.5
25.1
32.6
42.2/42.2
42.2/42.2
52.9/59.8
75.4/85.9
98.0/111.9
31.7/31.7
31.7/31.7
33.8/37.8
46.8/52.9
59.7/67.7
15.4
15.4
19.0
26.6
34.1
25/25
25/30
50/60
30/30
30/30
50/60
—
20/20
20/20
30/35
45/50
35/35
35/35
60/60
—
25/25
25/25
35/40
45/60
15
15
20
30
40/40
40/40
60/60
—
—
30/30
30/30
35/40
45/60
—
15
15
20
30
35
40/40
40/40
60/60
—
—
30/30
30/30
35/40
45/60
—
15
15
20
30
35
50/50
50/50
60/60
—
—
40/40
40/40
40/40
50/60
—
20
20
20
30
35
MOCP
—
—
—
—
—
—
80/90
—
—
—
—
—
—
—
80/90
—
—
—
—
—
—
—
—
—
—
—
80/90
100/110
—
—
—
—
60/70
—
—
—
—
—
—
—
—
90/90
100/110
—
—
—
—
60/70
—
—
—
—
—
—
—
—
90/90
100/125
—
—
—
—
60/70
—
—
—
—
—
21
LEGEND
FLA
HACR
IFM
LRA
MCA
MOCP
—
—
—
—
—
—
Full Load Amps
Heating, Air Conditioning and Refrigeration
Indoor-Fan Motor
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
(fuses or HACR-type circuit breaker)
NEC
— National Electrical Code
OFM
— Outdoor-Fan Motor
RLA
— Rated Load Amps
UL
— Underwriters Laboratories
* Single-Point Wiring Connections.
† Dual-Point Wiring Connections.
NOTES:
1. In compliance with NEC requirements for multimotor and
combination load equipment (refer to NEC Articles 430 and
440), the overcurrent protective device for the unit shall be
fuse or HACR breaker. The UL, Canada, units may be fuse
or circuit breaker.
2. Unbalanced 3-Phase supply Voltage
Never operate a motor where a phase imbalance in supply
voltage is greater than 2%. Use the following formula to
determine the percent of voltage imbalance.
% Voltage imbalance
max voltage deviation from average voltage
= 100 x
average voltage
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
22
452 + 464 + 455
3
1371
=
3
= 457
Average Voltage =
Determine maximum deviation from average voltage.
(AB) 457 - 452 = 5 v
(BC) 464 - 457 = 7 v
(AC) 457 - 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
457
= 1.53%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
®
Typical wiring schematic — 208/230-1-60 shown
23
Typical wiring schematic — 208/230-3-60 shown
24
Typical wiring schematic — 460-3-60 shown
25
Controls
Sequence of operation
When power is supplied to unit, the transformer (TRAN) is
energized.
On units with crankcase heater, heater is also energized.
Cooling — With the thermostat subbase in the cooling
position, the thermostat makes circuit R-O. This energizes
the reversing valve solenoid (RVS) and places the unit in
standby condition for cooling.
As the space temperature rises, the thermostat makes,
closing circuit R-Y. When compressor time delay (5±2
minutes) is completed, a circuit is made to contactor (C),
starting the compressor (COMP) and outdoor-fan motor
(OFM). Circuit R-G is made at the same time, energizing the
indoor-fan relay (IFR) and starting the indoor-fan motor
(IFM) after a 1-second delay.
When the thermostat is satisfied, contacts open, deenergizing
C. The COMP and OFM stop, and the IFM stops after a 60
sec time delay.
Heating — On a call for heat, thermostat makes circuits RY and R-G.
When compressor time delay (5±2 minutes) is completed, a
circuit is made to C, starting COMP and OFM. Circuit R-G
26
also is completed, energizing IFR and starting IFM after a 1sec delay.
Should room temperature continue to fall, circuit R-W is
made through second-stage thermostat bulb. If optional
electric heat package is used, a relay is energized, bringing
on first bank of supplemental electric heat. When thermostat
is satisfied, contacts open, deenergizing contactor and relay;
motors and heaters deenergize. The IFM is controlled by a
time-delay relay that keeps the fan on for 60 sec.
Defrost — Defrost board (DB) is a time and temperature
control, which includes a field-selectable time period (Dip
switch 1 and 2 on the board) between checks for defrost (30,
60, 90, or 120 minutes). Electronic timer and defrost cycle
start only when contactor is energized and defrost thermostat
(DFT) is closed.
The defrost board is also equipped with a 3rd dip switch for
selecting Quiet Shift operation. The Quiet Shift operation
turns compressor off at defrost initiation and termination.
Defrost mode is identical to cooling mode, except outdoor
fan motor stops and a bank of optional electric heat turns on
to warm air supplying the conditioned space.
Guide specifications
Packaged Heat Pump Units
Constant Volume Application
HVAC Guide Specifications
Size Range: 2 to 5 Tons, Nominal Cooling
Carrier Model Number: 50JZ
Part 1—General
SYSTEM DESCRIPTION
Outdoor rooftop or ground mounted, heat pump unit
utilizing a hermetic compressor for heating and cooling duty and optional electric heating. Unit shall discharge supply air vertically or horizontally as shown
on contract drawings. Outdoor fan/coil section shall
have a draw-thru design with vertical discharge for
minimum sound levels.
QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI Standards
210/240-94 and 270-95.
B. Unit shall be designed in accordance with UL Standard
1995.
C. Unit shall be manufactured in a facility registered to
ISO 9001 manufacturing quality standard.
D. Unit shall be UL listed and c-UL certified as a total
package for safety requirements.
E. Roof curb shall be designed to conform to NRCA Standards.
F. Insulation and adhesives shall meet NFPA 90A requirements for flame spread and smoke generation.
G. Cabinet insulation shall meet ASHRAE Standard 62P.
DELIVERY, STORAGE AND HANDLING
Unit shall be stored and handled per manufacturer’s
recommendations.
Part 2 — Products
EQUIPMENT
A. General:
Factory-assembled, single-piece, heat pump unit. Contained within the enclosure shall be all factory wiring,
piping, controls, refrigerant charge (R-410A), and special features required prior to field start-up.
B. Unit Cabinet:
1. Unit cabinet shall be constructed of phosphated,
zinc-coated, pre-painted steel capable of withstanding 500 hrs of salt spray.
2. Normal service shall be through a single removable
cabinet panel.
3. The unit shall be constructed on a rust proof basepan that has an externally trapped, integrated sloped
drain pan.
4. Indoor fan compartment top surface shall be insulated with a minimum 1/2-in. thick, flexible fiberglass
insulation, coated on the air side and retained by adhesive and mechanical means. The indoor wall sections will be insulated with a minimum semi-rigid
foil-faced board capable of being wiped clean. Alu-
minum foil-faced fiberglass insulation shall be used
in the entire indoor air cavity section.
5. Unit shall have a field-supplied condensate trap.
C. Fans:
1. The indoor fan shall be 3-speed, direct-drive, as
shown on equipment drawings.
2. Fan wheel shall be made from steel, and shall be
double-inlet type with forward curved blades with
corrosion resistant finish. Fan wheel shall be dynamically balanced.
3. Outdoor fan shall be direct drive propeller type with
aluminum blades riveted to corrosion resistant steel
spiders, be dynamically balanced, and discharge air
vertically.
D. Compressor:
1. Fully hermetic compressors with factory-installed
vibration isolation.
2. Scroll compressors shall be standard on all units.
E. Coils:
Indoor and outdoor coils shall have aluminum plate
fins mechanically bonded to seamless copper tubes
with all joints brazed. (Copper/copper and vinyl-coated construction available as option.) Tube sheet openings shall be belled to prevent tube wear.
F. Refrigerant Metering Device:
Refrigerant metering device shall be of the single body
fixed orifice feed type.
G. Filters:
Filter section shall consist of field-installed, throwaway, 1-in. thick fiberglass filters of commercially
available sizes.
H. Controls and Safeties:
1. Unit controls shall be complete with a selfcontained low voltage control circuit.
2. Units shall incorporate an internal compressor protector that provides reset capability.
3. Unit shall provide High and Low/Loss-of-Charge
Pressure Safety Protection.
I. Operating Characteristics:
1. Unit shall be capable of starting and running at
125°F ambient outdoor temperature, exceeding
maximum load criteria of ARI Standard 240-94.
2. Compressor with standard controls shall be capable of
operation down to 40° F ambient outdoor temperature
in cooling and -10°F in heating.
3. Unit shall be provided with 30 or 60-sec fan time
delay after the thermostat is satisfied.
J. Electrical Requirements:
All unit power wiring shall enter the unit cabinet at a
single location.
K. Motors:
1. Compressor motors shall be of the refrigerantcooled type with line-break thermal and current
overload protection.
27
Guide specifications (cont)
2. All fan motors shall have permanently lubricated
bearings, and inherent, automatic reset, thermal
overload protection.
3. Outdoor fan motor shall be totally enclosed.
L. Grille
1. Louvered Grille:
Louvered grille shall be standard on all units.
M. Special Features Available
1. Coil Options:
Shall include factory-installed optional copper/
copper and vinyl-coated refrigerant coils.
2. Economizer:
a. Economizer controls capable of providing free
cooling using outside air.
b. Equipped with low leakage dampers not to exceed 3% leakage, at 1.0 in. wg pressure differential.
c. Spring return motor shuts off outdoor damper on
power failure.
3. Flat Roof Curb:
Curbs shall have seal strip and a wood nailer for
flashing and shall be installed per manufacturer’s
instructions.
4. Manual Outdoor Air Damper:
Package shall consist of damper, birdscreen, and
rainhood which can be preset to admit outdoor air
for year-round ventilation.
5. Thermostat:
To provide for one-stage heating and cooling in addition manual or automatic changeover and indoor
fan control.
Carrier Corporation • Indianapolis, IN 46231
6. Low Ambient Package:
Shall consist of a solid-state control and condenser
coil temperature sensor for controlling condenserfan motor operation, which shall allow unit to operate down to 0° F outdoor ambient temperature in
cooling.
7. Filter Rack Kit:
Shall provide filter mounting for downflow applications.
8. Square-To-Round Duct Transitions:
Shall have the ability to convert the supply and return openings from rectangular to round. (024-048
only)
9. Compressor Protection:
Solid-state control shall protect compressor by preventing “short cycling.”
10. Crankcase Heater:
Shall provide anti-floodback protection for lowload cooling applications. (Standard on 042-060
sizes)
11. Electric heaters:
a. Electric heater shall be available as a fieldinstalled option.
b. Heater elements shall be open wire type, adequately supported and insulated with ceramic
bushings.
c. Electric heater packages must provide single
point power connection capability.
12. Compressor Hard start kit:
Shall be available to give a boost to the compressor
motor at each start-up.
7/00
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
Tab
4
5b 5a
Page 28
Catalog No. 525-087
Printed in U.S.A.
PC 102
Form 50JZ-1PD
Replaces: NEW