Carrier 50ZH Series Operation manual

Single-Package Heat Pump Units
with:
• easy installation design
• corrosion-proof basepan
• sloped drain pan for improved
indoor air quality
• scroll compressors
• through-the-top service access
• louvered panel coil protection
Features/Benefits
Compact, horizontal supply
and return unit, combin-
ing easy installation and
maintenance with efficient
performance.
Easy to install
The 50ZH units are light weight, com-
pact single-package units that are
easy to handle. Every 50ZH unit has
an identical 32 by 51-in. footprint
to make jobsite planning simple. The
precise design uses less sheet metal
and makes the 50ZH units lighter
than other units. The unit can be eas-
ily positioned on the jobsite with the
hand-holds built into the unit basepan.
Drop-in cartridge style heaters are
utilized to minimize installation time.
Top cover service access
The 50ZH units are designed to be
serviced from the top. The split-top
design allows easy access for installa-
tion and maintenance procedures
on the unit. Routine maintenance tasks
such as coil cleaning are sped up
with through-the-top access. Multiple
side panels do not need to be re-
moved as with other units.
Product
Data 50ZH
Single-Package
Heat Pump Units
2 to 5 Nominal Tons
Copyright 1998 Carrier Corporation Form 50ZH-2PD

Corrosion proof basepan
The 50ZH features a tough, high-
tech, single-piece, composite material
basepan with an integrated drain
pan. The composite material elimi-
nates the potential problem of rust
and premature replacement which are
common with standard metal pans.
Each 50ZH basepan is sloped to
eliminate standing water. This feature
minimizes the amount of standing
water inside the unit, which limits
algae growth.
Durable steel cabinet
The watertight construction and
corrosion-resistant finish of the 50ZH
will keep it looking like new for
years. Carrier’s paint treatment pro-
cess ensures quality protection against
the elements. A compact, low-profile
design utilizes a louvered coil
enclosure for maximum protection
against hail damage and vandalism.
Scroll compressors
Each 50ZH comes standard with
a high reliability design scroll
compressor. Each scroll compressor is
hermetically sealed against contami-
nation to help promote longer life and
dependable operation. All scroll
compressors have internal high-
pressure and overcurrent protection.
Coil efficiency
Indoor and outdoor coils are com-
puter designed for optimum heat
transfer and cooling efficiency.
Chronotemp™ defrost system
The system provides time/
temperature-based defrost cycles to
maintain unit efficiency. This highly
reliable system checks for coil icing
conditions at preset intervals and ini-
tiates a defrost cycle only if it is re-
quired. The defrost cycle ends as soon
as defrosting is accomplished. Each
defrost board is also equipped with
5-minute compressor time guard
protection.
Accessory electric heaters
A variety of accessory electric supple-
mentary heaters are available for
the 50ZH units. Each heater is a
drop-in style cartridge type with single-
point electrical connections for both
the heater and the unit.
Starter collars
Starter collars are provided with each
unit to provide easy connection to
the structure ductwork.
Dependable components
Direct-drive multispeed, PSC (perma-
nent split capacitor) blower motor is
standard on all models.
Direct-drive, PSC outdoor-fan mo-
tors are designed to help reduce
energy consumption and provide for
cooling operation down to 40 F.
Refrigerant system is designed to
provide dependability. Liquid refriger-
ant strainers are used to promote
clean, unrestricted operation. Each
unit leaves the factory with a full refrig-
erant charge and is fully run tested.
Refrigerant service connections make
checking operating pressures easier.
Model number nomenclature
Table of contents Page
Features/Benefits ...............................1,2
Model Number Nomenclature .....................2
ARI Capacities ..................................3
Physical Data ...................................3
Accessories .....................................4
Base Unit Dimensions ...........................5-7
Selection Procedure ..............................8
Performance Data ..............................9-16
Electrical Data .................................17
Typical Wiring Schematic ......................18,19
Controls ......................................19
Typical Piping and Wiring .......................20
Guide Specifications ...........................21,22
2

ARI* capacities
UNIT
50ZH NOMINAL TONS STANDARD CFM NET COOLING
CAPACITIES
AT 95 F (Btuh) SEER† NET HEATING
CAPACITIES
AT 47 F (Btuh) HSPF SOUND
RATINGS**
(bels)
024 2.0 800 22,800 10.00 21,800 6.8 7.8
030 2.5 1000 28,200 10.00 27,200 6.8 8.4
036 3.0 1200 34,200 10.00 33,800 6.8 8.0
042 3.5 1400 40,000 10.00 40,000 6.8 8.0
048 4.0 1600 46,000 10.00 45,000 6.8 8.2
060 5.0 2000 55,000 10.50 52,500 6.8 8.4
LEGEND
Bels — Sound Levels (1 Bel = 10 Decibels)
HSPF — Heating Seasonal Performance Factor
SEER — Seasonal Energy Efficiency Ratio
*Air Conditioning and Refrigeration Institute.
†Rated in accordance with U.S. Government DOE (Department of Energy) test
procedures and/or ARI Standard 210/240-89.
**Rated in accordance with ARI Standard 270-84.
Physical data
UNIT 50ZH 024 030 036 042 048 060
OPERATING WEIGHT (lb) 232 254 277 295 328 368
COMPRESSOR TYPE Scroll
REFRIGERANT R-22
Charge (lb) 3.1 5.6 5.9 6.6 8.6 9.7
REFRIGERANT METERING DEVICE Acutrol™ System
OUTDOOR COIL Copper Tubes, Aluminum Plate Fins
Rows...Fins/in. 1...17 2...17 1...17 2...17 2...17 2...17
Total Face Area (sq ft) 7.9 6.7 11.1 9.3 11.1 12.7
OUTDOOR-FAN MOTOR Propeller
Nominal Cfm 1800 2000 2600 2600 2600 3200
Nominal Rpm 825 1100 1100 1100 1100 1100
Motor Hp
1
⁄ 81 ⁄ 41 ⁄ 41 ⁄ 41 ⁄ 41 ⁄ 2
Diameter (in.) 20 20 20 20 20 20
INDOOR COIL Copper Tubes, Aluminum Plate Fins
Rows...Fins/in. 2...15 3...15 3...15 3...15 4...15 4...15
Total Face Area (sq ft) 3.1 3.1 4.0 4.0 4.4 4.9
INDOOR-FAN MOTOR Direct Drive
Blower Motor Size (in.) 10x8 10x8 10x9 10x9 10x9 10×10
Nominal Cfm 800 1000 1200 1400 1600 2000
Rpm Range 550-1000 550-1000 800-1050 800-1050 1000-1100 950-1100
Number of Speeds 3333 2 3
Factory Speed Setting Low Med Low Med Low Low
Motor Hp
1
⁄ 41 ⁄ 41 ⁄ 21 ⁄ 23 ⁄ 4 1
CONNECTING DUCT SIZES Round Square
Supply Air (in.) 14 13.9 × 13.9
Return Air (in.) 14 13.9 × 27.8
FIELD-SUPPLIED RETURN AIR FILTER*
Throwaway (in.) 24x24 24x24 24x24 24x24 24x30 24×30
*Required filter sizes shown are based on the ARI (Air Conditioning and Refrigeration Institute) rated
airflow at a velocity of 300 ft/min for throwaway type or 450 ft/min for high capacity type. Recom-
mended filters are 1-in. thick.
3

Accessories
ACCESSORY
Outdoor Thermostat
Thermostat and Subbase
Electronic Programmable Thermostat
Electric Heat with Single-Point Kit (5.0 to 20.0 kW)
Electronic programmable thermostat provides 2-stage
heating and 2-stage cooling control with remote communi-
cation ability.
Thermostat and subbase provide heating and cooling
unit control. The subbase provides system and fan switch-
ing at the thermostat location.
Electric heaters provide heat in the unit when required.
Each package has a heater module that slides into keyed
mounting slots in the fan inlet. Heater sizes 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. See Electrical data table on page 17
for accessory electric heater usage.
Outdoor thermostat brings second stage of 2-stage elec-
tric heater on line when the outdoor-air temperature falls
below the set point.
THERMOSTATS
ODS CATALOG
ORDERING NO. DESCRIPTION
TSTATCCN2501-A Residential Thermostat — Autochangeover — 3 Heat/2 Cool, Non-Programmable
TSTATCCP2501-A Residential Thermostat — Autochangeover — 3 Heat/2 Cool, Programmable
33CSPTN-01 Commercial Thermostat — Autochangeover — 3 Heat/2 Cool, Programmable
ODS — Order Distribution System
4

Base unit dimensions — 50ZH024,030
REQUIRED CLEARANCES TO COMBUSTIBLE MAT’L Millimeters (in.)
Top of Unit ...................................0
Duct Side of Unit ...............................0
Side Opposite Ducts .............................0
Bottom of Unit .................................0
NEC REQUIRED CLEARANCES Millimeters (in.)
Between Units, Power Entry Side .................1066.8 (42.00)
Unit and Ungrounded Surfaces, Power Entry Side ....... 914.0 (36.00)
Unit and Block or Concrete Walls and Other Grounded
Surfaces, Power Entry Side ....................1066.8 (42.00)
REQUIRED CLEARANCES FOR SERVICING Millimeters (in.)
Outdoor Coil Access Side .......................762.0 (30.00)
Power Entry Side ............................762.0 (30.00)
(Except for NEC Requirements)
Unit Top ..................................914.0 (36.00)
Side Opposite Ducts ..........................762.0 (30.00)
LEGEND
NEC — National Electrical Code
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-
fan discharge, with the exception of the outdoor coil (914 mm [36 in.]). A
removable fence or barricade requires no clearance.
2. Dimensions are in millimeters. Dimensions in ( ) are in inches.
3. is the center of gravity.
UNIT ELECTRICAL
CHARACTERISTICS UNIT WT CENTER OF GRAVITY mm (in.)
Lb Kg X Y Z
50ZH024 208/230-1-60 232 106 356 (14.0) 483 (19.0) 305 (12.0)
50ZH030 208/230-1-60; 208/230-3-60 254 116 356 (14.0) 483 (19.0) 305 (12.0)
5

Base unit dimensions — 50ZH036-048
REQUIRED CLEARANCES TO COMBUSTIBLE MAT’L Millimeters (in.)
Top of Unit ...................................0
Duct Side of Unit ...............................0
Side Opposite Ducts .............................0
Bottom of Unit .................................0
NEC REQUIRED CLEARANCES Millimeters (in.)
Between Units, Power Entry Side .................1066.8 (42.00)
Unit and Ungrounded Surfaces, Power Entry Side ....... 914.0 (36.00)
Unit and Block or Concrete Walls and Other Grounded
Surfaces, Power Entry Side ....................1066.8 (42.00)
REQUIRED CLEARANCES FOR SERVICING Millimeters (in.)
Outdoor Coil Access Side .......................762.0 (30.00)
Power Entry Side ............................762.0 (30.00)
(Except for NEC Requirements)
Unit Top ..................................914.0 (36.00)
Side Opposite Ducts ..........................762.0 (30.00)
LEGEND
NEC — National Electrical Code
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-
fan discharge, with the exception of the outdoor coil (914 mm [36 in.]). A
removable fence or barricade requires no clearance.
2. Dimensions are in millimeters. Dimensions in ( ) are in inches.
3. is the center of gravity.
UNIT ELECTRICAL
CHARACTERISTICS UNIT WT CENTER OF GRAVITY mm (in.)
Lb Kg X Y Z
50ZH036 208/230-1-60, 208/230-3-60, 460-3-60 277 126 356 (14.0) 483 (19.0) 381 (15.0)
50ZH042 208/230-1-60, 208/230-3-60, 460-3-60 295 134 356 (14.0) 483 (19.0) 381 (15.0)
50ZH048 208/230-1-60, 208/230-3-60, 460-3-60 328 149 356 (14.0) 483 (19.0) 381 (15.0)
6

Base unit dimensions — 50ZH060
REQUIRED CLEARANCES TO COMBUSTIBLE MAT’L Millimeters (in.)
Top of Unit ...................................0
Bottom of Unit .................................0
Side of Unit with Duct Openings ......................0
Side of Unit Opposite Duct Openings ...................0
NEC REQUIRED CLEARANCES Millimeters (in.)
Between Units, Power Entry Side .................1066.8 (42.00)
Unit and Ungrounded Surfaces, Power Entry Side ....... 914.0 (36.00)
Unit and Block or Concrete Walls and Other Grounded
Surfaces, Power Entry Side ....................1066.8 (42.00)
REQUIRED CLEARANCES FOR SERVICING Millimeters (in.)
Top of Unit ................................914.0 (36.00)
Side of Unit Opposite Duct Openings ................762.0 (30.00)
Side of Unit with Power Entry ....................762.0 (30.00)
(Except for NEC Requirements)
LEGEND
NEC — National Electrical Code
NOTES:
1. Clearances must be maintained to prevent recirculation of air from outdoor-
fan discharge. A removable fence or barricade requires no clearance.
2. Dimensions are in millimeters. Dimensions in [ ] are in inches.
3. is the center of gravity.
UNIT ELECTRICAL CHARACTERISTICS
V-Ph-Hz
UNIT WEIGHT CENTER OF GRAVITY mm (in.)
Lb Kg X Y Z
50ZH060 208/230-1-60, 208/230-3-60,
460-3-60 368 167 356 (14.00) 508 (20.00) 406 (16.00)
7

Selection procedure
I Determine cooling and heating requirements at
design conditions.
Given:
Required Cooling Capacity (TC) .....28,000 Btuh
Sensible Heat Capacity (SHC) ......20,500 Btuh
Required Heating Capacity .........28,550 Btuh
Outdoor Entering-Air Temperature .........95F
Outdoor-Air Winter Design Temperature .....20F
Indoor-Air Winter Design Temperature ......70F
Indoor Entering-Air Temperature .......80Fedb,
67 F ewb
Indoor-Air Quantity ................1125 cfm
External Static Pressure ............0.20 in. wg
Electrical Characteristics (V-Ph-Hz) ......230-1-60
edb — entering dry bulb
ewb — entering wet bulb
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 50ZH030 unit
will provide a total cooling capacity of 28,800 Btuh
and a sensible heat capacity of 21,700 Btuh.
For indoor-air temperature other than 80 F edb
(entering 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.
III Select electric heat.
Enter the unit 50ZH030 Heating Capacities table at
1125 cfm. At 70 F return indoor air and 20 F air en-
tering outdoor coil, the integrated heating capacity is
15,500 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 28,550 Btuh. There-
fore, 13,050 Btuh (28,550 – 15,500) additional elec-
tric heat is required.
Determine additional electric heat capacity in kW.
13,050 Btuh = 3.8 kW of heat required
3414 Btuh/kW
Enter the Electrical data table on page 17 for 208/
230 v, single-phase, 50ZH030 unit. The 5-kW heater
at 240 v most closely satisfies the heating required. To
calculate kW at 230 v, multiply the heater kW by mul-
tiplication factor 0.92 found in the Multiplication
Factors table on page 15.
5 kW x 0.92 = 4.6 kW
4.6 x 3414 = 15,704 Btuh
To calculate kW at 208 v, see Multiplication Factors
table on page 15.
Total unit heating capacity is 31,204 Btuh (15,500
+ 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, the Ac-
cessory Electric Heat Pressure Drop table, Wet Coil
Pressure Drop table, and the Filter Pressure Drop table,
find:
External static pressure 0.20 in. wg
Filter 0.09 in. wg
Electric heat 0.11 in. wg
Wet coil 0.07 in. wg
Total static pressure 0.47 in. wg
Enter the table for Dry Coil Air Delivery — Hori-
zontal Discharge at 1125 cfm and 230-v high speed.
By interpolation, the standard motor will deliver
0.48 in. wg static pressure. This will adequately handle
job requirements.
8

Performance data
COOLING CAPACITIES
50ZH024 (2 TONS)
Temp (F)
Air Ent
Outdoor
Coil
(edb)
Indoor Entering Air — CFM/BF
700/0.12 800/0.14 900/0.15
Indoor Entering Air — Ewb (F)
72 67 63* 62 72 67 63* 62 72 67 63* 62
85 TC 26.6 24.1 22.2 22.0 27.0 24.5 22.6 22.4 27.3 24.9 23.0 22.8 SHC 13.2 16.7 16.2 19.8 13.8 17.7 17.1 21.1 14.4 18.6 18.0 22.1
kW 2.19 2.15 2.15 2.13 2.23 2.19 2.18 2.17 2.26 2.23 2.23 2.21
95 TC 25.6 23.0 21.2 20.9 26.0 22.8 21.6 21.4 26.3 23.8 21.8 21.7 SHC 12.9 16.4 15.7 19.3 13.5 17.4 16.6 20.6 14.1 18.3 17.5 21.7
kW 2.40 2.36 2.35 2.33 2.44 2.40 2.39 2.37 2.48 2.44 2.43 2.41
105 TC 24.4 21.9 20.0 19.8 24.8 22.3 20.4 20.2 25.1 22.6 20.7 20.7 SHC 12.5 15.9 15.2 18.8 13.1 16.9 16.2 20.0 13.7 17.9 17.0 20.7
kW 2.64 2.60 2.57 2.56 2.69 2.64 2.62 2.60 2.73 2.68 2.66 2.65
115 TC 23.2 20.6 18.7 18.5 23.5 21.0 19.0 19.1 23.8 21.3 19.3 19.7 SHC 12.0 15.4 14.7 18.1 12.7 16.4 15.6 19.1 13.2 17.3 16.4 19.7
kW 2.91 2.86 2.83 2.81 2.96 2.90 2.87 2.86 3.00 2.95 2.91 2.91
50ZH030 (2
1
⁄ 2 TONS)
Temp (F)
Air Ent
Outdoor
Coil
(edb)
Indoor Entering Air — CFM/BF
875/0.10 1000/0.11 1125/0.12
Indoor Entering Air — Ewb (F)
72 67 63* 62 72 67 63* 62 72 67 63* 62
85 TC 31.6 29.2 27.1 26.4 32.2 29.6 27.5 26.9 31.9 29.9 27.8 27.2 SHC 15.0 19.8 19.5 23.9 15.7 20.9 20.7 25.4 15.9 22.0 21.7 26.6
kW 2.80 2.76 2.73 2.71 2.87 2.82 2.79 2.77 2.90 2.88 2.84 2.83
95 TC 30.9 28.1 26.0 25.3 31.2 28.2 26.4 25.7 31.4 28.8 26.7 26.1 SHC 15.0 19.4 19.1 23.4 15.6 20.6 20.3 24.9 16.1 21.7 21.3 26.0
kW 3.05 3.00 2.96 2.94 3.11 3.05 3.02 3.00 3.16 3.11 3.07 3.06
105 TC 29.7 26.9 24.8 24.1 30.0 27.2 25.1 24.5 30.1 27.5 25.4 25.1 SHC 14.6 19.0 18.6 22.8 15.2 20.2 19.8 24.2 15.7 21.4 20.9 25.1
kW 3.31 3.26 3.21 3.19 3.37 3.32 3.27 3.26 3.41 3.37 3.34 3.33
115 TC 28.4 25.5 23.5 22.9 28.7 25.8 23.8 23.4 28.8 26.1 24.0 24.0 SHC 14.2 18.6 18.1 22.2 14.9 19.8 19.2 23.4 15.4 20.9 20.3 24.0
kW 3.58 3.53 3.46 3.44 3.64 3.60 3.53 3.51 3.69 3.65 3.59 3.59
LEGEND
BF — Bypass Factor
Edb — Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW — Total Unit Power Input
Ldb — Leaving Dry-Bulb
Lwb — Leaving Wet-Bulb
SHC — Sensible Heat Capacity (1000 Btuh) Net
TC — Total Capacity (1000 Btuh) Net
*At 75 F entering dry bulb (Tennessee Valley Authority [TVA] rating
conditions); all others at 80 F entering dry bulb.
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (Btuh)
tldb =t
edb –1.10 x cfm
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (hlwb)
total capacity (Btuh)
hlwb =h
ewb –4.5 x cfm
Where: hewb = Enthalpy of air entering evaporator coil
3. The SHC is based on 80 F edb temperature of air entering evapo-
rator 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).
9

Performance data (cont)
COOLING CAPACITIES (cont)
50ZH036 (3 TONS)
Temp (F)
Air Ent
Outdoor
Coil
(edb)
Indoor Entering Air — CFM/BF
1050/0.09 1200/0.11 1350/0.12
Indoor Entering Air — Ewb (F)
72 67 63* 62 72 67 63* 62 72 67 63* 62
85 TC 39.9 35.8 33.1 32.3 40.5 36.4 33.7 32.9 40.9 36.8 34.0 33.3 SHC 19.1 24.2 23.4 29.0 19.9 25.7 24.8 30.8 20.7 27.0 26.0 32.4
kW 3.49 3.37 3.29 3.27 3.57 3.45 3.36 3.35 3.64 3.52 3.43 3.42
95 TC 38.5 34.5 31.8 31.0 39.1 34.2 32.3 31.6 39.4 35.4 32.7 32.0 SHC 18.7 23.7 22.9 28.4 19.5 25.2 24.3 30.3 20.4 26.6 25.6 31.8
kW 3.80 3.67 3.58 3.56 3.88 3.75 3.66 3.64 3.95 3.82 3.73 3.72
105 TC 36.9 33.0 30.4 29.6 37.5 33.5 30.9 30.1 37.9 33.8 31.2 30.8 SHC 18.2 23.2 22.4 27.8 19.0 24.7 23.8 29.6 19.9 26.1 25.1 30.8
kW 4.15 4.01 3.91 3.89 4.23 4.08 3.99 3.97 4.30 4.16 4.06 4.05
115 TC 35.2 31.4 28.9 28.2 35.7 31.9 29.3 28.7 36.1 32.1 29.6 29.6 SHC 17.6 22.6 21.8 27.1 18.5 24.1 23.2 28.7 19.3 25.5 24.5 29.5
kW 4.51 4.36 4.26 4.24 4.60 4.44 4.34 4.33 4.68 4.52 4.14 4.42
50ZH042 (3
1
⁄ 2 TONS)
Temp (F)
Air Ent
Outdoor
Coil
(edb)
Indoor Entering Air — CFM/BF
1225/0.11 1400/0.13 1575/0.14
Indoor Entering Air — Ewb (F)
72 67 63* 62 72 67 63* 62 72 67 63* 62
85 TC 45.9 41.1 38.0 37.0 46.6 41.8 38.6 37.6 47.2 42.3 39.1 38.2 SHC 22.1 28.0 27.1 33.5 23.2 29.8 28.7 35.6 24.2 31.5 30.3 37.5
kW 4.28 4.15 4.06 4.04 4.37 4.24 4.15 4.13 4.45 4.32 4.23 4.21
95 TC 43.9 39.2 36.2 35.2 44.6 40.0 36.8 35.8 45.2 40.3 37.2 36.4 SHC 21.5 27.3 26.4 32.7 22.5 29.1 28.0 34.7 23.5 30.8 29.6 36.4
kW 4.65 4.51 4.42 4.39 4.74 4.60 4.50 4.48 4.82 4.68 4.58 4.56
105 TC 41.8 37.2 34.3 33.4 42.5 37.8 34.8 34.0 42.9 38.2 35.2 34.9 SHC 20.8 26.6 25.6 31.8 21.8 28.3 27.2 33.7 22.8 30.0 28.8 34.9
kW 5.00 4.90 4.80 4.78 5.09 4.99 4.89 4.87 5.17 5.07 4.97 4.97
115 TC 39.7 35.2 32.4 31.5 40.2 35.7 32.8 32.3 40.7 36.0 33.1 33.3 SHC 20.1 25.8 24.8 30.8 21.1 27.5 26.4 32.3 22.1 29.2 27.9 33.3
kW 5.44 5.32 5.21 5.19 5.53 5.41 5.30 5.29 5.61 5.50 5.40 5.40
LEGEND
BF — Bypass Factor
Edb — Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW — Total Unit Power Input
Ldb — Leaving Dry-Bulb
Lwb — Leaving Wet-Bulb
SHC — Sensible Heat Capacity (1000 Btuh) Net
TC — Total Capacity (1000 Btuh) Net
*At 75 F entering dry bulb (Tennessee Valley Authority [TVA] rating
conditions); all others at 80 F entering dry bulb.
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (Btuh)
tldb =t
edb –1.10 x cfm
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (hlwb)
total capacity (Btuh)
hlwb =h
ewb –4.5 x cfm
Where: hewb = Enthalpy of air entering evaporator coil
3. The SHC is based on 80 F edb temperature of air entering evapo-
rator 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).
10

COOLING CAPACITIES (cont)
50ZH048 (4 TONS)
Temp (F)
Air Ent
Outdoor
Coil
(edb)
Indoor Entering Air — CFM/BF
1400/0.08 1600/0.08 1800/0.09
Indoor Entering Air — Ewb (F)
72 67 63* 62 72 67 63* 62 72 67 63* 62
85 TC 57.4 52.5 43.8 41.2 57.7 53.0 44.4 42.6 58.2 53.7 45.0 44.5 SHC 27.1 34.7 31.7 40.1 27.8 36.9 33.7 42.4 29.0 38.6 35.7 44.5
kW 3.63 3.60 4.39 4.26 3.72 3.70 4.50 4.38 3.84 3.78 4.59 4.51
95 TC 55.1 50.0 41.3 39.3 55.5 46.0 41.9 40.6 56.0 51.2 42.3 42.2 SHC 26.4 33.7 30.7 38.6 27.2 36.0 32.8 40.5 28.3 37.8 34.7 42.2
kW 4.06 4.02 4.82 4.75 4.15 4.12 4.93 4.87 4.26 4.21 5.03 4.99
105 TC 52.8 47.4 38.6 37.4 53.4 48.1 39.0 38.6 53.8 48.7 39.5 39.8 SHC 25.6 32.8 29.6 37.0 26.7 35.0 31.6 38.5 27.7 37.0 33.5 39.8
kW 4.49 4.44 5.25 5.24 4.59 4.54 5.36 5.36 4.68 4.63 5.47 5.48
115 TC 42.0 38.0 36.1 48.4 42.6 38.3 36.4 49.4 43.1 38.7 36.7 50.9 SHC 37.7 31.1 28.1 46.4 40.5 33.5 30.5 49.4 42.9 35.7 32.5 50.9
kW 4.61 5.79 5.73 5.81 4.71 5.89 5.84 5.94 4.81 6.00 5.94 6.08
50ZH060 (5 TONS)
Temp (F)
Air Ent
Outdoor
Coil
(edb)
Indoor Entering Air — CFM/BF
1800/0.04 2000/0.05 2250/0.06
Indoor Entering Air — Ewb (F)
72 67 63* 62 72 67 63* 62 72 67 63* 62
85 TC 65.7 59.9 55.5 54.4 66.4 60.8 56.5 55.7 67.3 61.7 57.4 57.4 SHC 33.7 43.4 50.8 52.5 35.2 46.5 54.4 55.7 36.8 49.4 57.3 57.4
kW 5.55 5.45 5.35 5.33 5.67 5.58 5.48 5.47 5.82 5.71 5.61 5.62
95 TC 63.1 55.0 52.8 51.8 64.1 58.1 53.7 53.5 64.7 58.8 55.3 55.0 SHC 32.9 41.9 49.6 51.1 34.5 45.4 53.1 53.4 36.3 48.3 55.2 55.0
kW 5.94 5.85 5.74 5.72 6.08 5.98 5.87 5.88 6.21 6.09 6.02 6.03
105 TC 60.2 53.6 49.9 49.3 61.0 54.9 51.2 51.1 61.7 55.7 52.7 52.6 SHC 31.9 40.8 48.3 49.3 33.6 44.3 51.1 51.1 35.3 47.2 52.7 52.6
kW 6.37 6.28 6.18 6.16 6.50 6.40 6.32 6.33 6.64 6.52 6.47 6.48
115 TC 57.3 51.2 47.1 46.7 58.0 51.8 48.7 48.7 58.6 52.6 50.1 50.2 SHC 30.9 40.1 47.0 46.7 32.7 43.1 48.7 48.7 34.3 46.1 50.1 50.1
kW 6.80 6.71 6.61 6.60 6.92 6.83 6.77 6.78 7.07 6.95 6.92 6.93
LEGEND
BF — Bypass Factor
Edb — Entering Dry-Bulb
Ewb — Entering Wet-Bulb
kW — Total Unit Power Input
Ldb — Leaving Dry-Bulb
Lwb — Leaving Wet-Bulb
SHC — Sensible Heat Capacity (1000 Btuh) Net
TC — Total Capacity (1000 Btuh) Net
*At 75 F entering dry bulb (Tennessee Valley Authority [TVA] rating
conditions); all others at 80 F entering dry bulb.
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
sensible capacity (Btuh)
tldb =t
edb –1.10 x cfm
tlwb = Wet-bulb temperature corresponding to enthalpy of air
leaving indoor coil (hlwb)
total capacity (Btuh)
hlwb =h
ewb –4.5 x cfm
Where: hewb = Enthalpy of air entering evaporator coil
3. The SHC is based on 80 F edb temperature of air entering evapo-
rator 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).
11

Performance data (cont)
HEATING CAPACITIES
50ZH024
Temp (F)
Air Ent
Indoor
Coil
(edb)
Indoor
Air CFM
(Std)
Temperature Air Entering Outdoor Coil (F db at 70% rh)
−100 1017203040475060
60
700 Cap. 7.81 7.18 9.70 8.93 11.8 10.9 13.5 12.3 14.3 13.0 16.8 14.7 19.6 19.6 21.9 21.9 22.7 22.7 26.1 26.1
kW 1.58 1.66 1.74 1.81 1.83 1.93 2.03 2.12 2.16 2.29
800 Cap. 7.81 7.18 9.83 9.04 12.0 11.0 13.7 12.5 14.4 13.0 17.1 14.9 19.8 19.8 22.2 22.2 22.9 22.9 26.4 26.4
kW 1.60 1.68 1.76 1.81 1.84 1.92 2.02 2.10 2.13 2.24
900 Cap. 7.86 7.23 10.0 9.24 12.3 11.3 13.9 12.7 14.6 13.3 17.2 15.1 20.0 20.0 22.4 22.4 23.1 23.1 26.5 26.5
kW 1.63 1.70 1.78 1.83 1.85 1.93 2.02 2.10 2.13 2.22
70
700 Cap. 7.27 6.69 9.27 8.53 11.5 10.5 13.1 12.0 14.0 12.7 16.5 14.4 19.3 19.3 21.6 21.6 22.4 22.4 25.9 25.9
kW 1.67 1.77 1.87 1.94 1.98 2.09 2.21 2.31 2.35 2.51
800 Cap. 7.28 6.70 9.39 8.64 11.6 10.7 13.3 12.1 14.1 12.8 16.7 14.6 19.6 19.6 21.8 21.8 22.6 22.6 26.0 26.0
kW 1.69 1.79 1.88 1.95 1.98 2.08 2.19 2.28 2.32 2.45
900 Cap. 7.32 6.73 9.60 8.83 11.9 10.9 13.6 12.4 14.4 13.0 17.0 14.9 19.7 19.7 22.0 22.0 22.8 22.8 26.2 26.2
kW 1.72 1.81 1.90 1.97 1.99 2.08 2.19 2.27 2.30 2.42
80
700 Cap. 6.66 6.13 8.80 8.10 11.0 10.1 12.8 11.6 13.7 12.5 16.2 14.2 18.9 18.9 21.2 21.2 22.1 22.1 25.6 25.6
kW 1.76 1.89 2.01 2.10 2.14 2.27 2.41 2.53 2.57 2.76
800 Cap. 6.69 6.15 8.89 8.18 11.2 10.3 12.9 11.8 13.9 12.6 16.3 14.3 19.1 19.1 21.5 21.5 22.3 22.3 25.7 25.7
kW 1.79 1.91 2.02 2.10 2.14 2.26 2.38 2.49 2.53 2.69
900 Cap. 6.69 6.16 9.10 8.38 11.4 10.5 13.2 12.0 14.1 12.8 16.6 14.6 19.4 19.4 21.7 21.7 22.5 22.5 25.9 25.9
kW 1.82 1.93 2.04 2.11 2.15 2.26 2.37 2.47 2.51 2.65
LEGEND
Cap. — Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat)
db — Dry Bulb
kW — Total Power Input (Includes Compressor Motor Power Input, Outdoor-
Fan Motor Input, and Indoor-Fan Motor Input)
rh — Relative Humidity
NOTES:
1. indicates integrated ratings.
2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost
on the outdoor coil and the heat required to defrost it.
50ZH030
Temp (F)
Air Ent
Indoor
Coil
(edb)
Indoor
Air CFM
(Std)
Temperature Air Entering Outdoor Coil (F db at 70% rh)
−100 1017203040475060
60
875 Cap. 9.13 8.40 11.5 10.6 14.1 13.0 16.1 14.7 17.0 15.4 20.4 17.8 24.2 24.2 27.5 27.5 28.6 28.6 33.9 33.9
kW 2.12 2.18 2.25 2.29 2.31 2.40 2.49 2.58 2.61 2.77
1000 Cap. 9.30 8.56 11.7 10.8 14.3 13.1 16.3 14.8 17.2 15.6 20.6 18.0 24.4 24.4 27.8 27.8 28.9 28.9 34.3 34.3
kW 2.15 2.20 2.26 2.30 2.32 2.39 2.48 2.56 2.59 2.73
1125 Cap. 9.46 8.70 11.9 10.9 14.5 13.3 16.4 15.0 17.4 15.8 20.8 18.2 24.6 24.6 28.0 28.0 29.2 29.2 34.6 34.6
kW 2.19 2.23 2.28 2.32 2.33 2.40 2.48 2.56 2.58 2.71
70
875 Cap. 8.62 7.93 11.1 10.2 13.8 12.7 15.8 14.4 16.7 15.1 20.0 17.5 23.7 23.7 26.9 26.9 28.0 28.0 33.1 33.1
kW 2.26 2.33 2.41 2.47 2.49 2.58 2.68 2.78 2.81 2.97
1000 Cap. 8.81 8.11 11.3 10.4 14.0 12.9 16.0 14.6 16.9 15.3 20.2 17.7 23.9 23.9 27.2 27.2 28.3 28.3 33.6 33.6
kW 2.29 2.35 2.42 2.47 2.49 2.57 2.66 2.75 2.78 2.92
1125 Cap. 8.97 8.25 11.5 10.5 14.2 13.0 16.2 14.7 17.1 15.5 20.4 17.9 24.2 24.2 27.5 27.5 28.6 28.6 33.9 33.9
kW 2.32 2.38 2.44 2.48 2.50 2.57 2.66 2.74 2.77 2.90
80
875 Cap. 7.99 7.35 10.6 9.71 13.3 12.2 15.5 14.1 16.4 14.9 19.6 17.2 23.2 23.2 26.3 26.3 27.4 27.4 32.4 32.4
kW 2.39 2.49 2.58 2.64 2.67 2.78 2.89 2.99 3.03 3.20
1000 Cap. 8.18 7.53 10.7 9.89 13.6 12.4 15.7 14.3 16.6 15.0 19.8 17.4 23.5 23.5 26.6 26.6 27.7 27.7 32.8 32.8
kW 2.42 2.51 2.59 2.65 2.67 2.77 2.87 2.96 2.99 3.14
1125 Cap. 8.36 7.69 10.9 10.1 13.8 12.6 15.9 14.5 16.8 15.2 20.0 17.6 23.7 23.7 26.9 26.9 28.0 28.0 33.2 33.2
kW 2.45 2.53 2.61 2.66 2.68 2.77 2.86 2.94 2.97 3.11
LEGEND
Cap. — Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat)
db — Dry Bulb
kW — Total Power Input (Includes Compressor Motor Power Input, Outdoor-
Fan Motor Input, and Indoor-Fan Motor Input)
rh — Relative Humidity
NOTES:
1. indicates integrated ratings.
2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost
on the outdoor coil and the heat required to defrost it.
12

HEATING CAPACITIES (cont)
50ZH036
Temp (F)
Air Ent
Indoor
Coil
(edb)
Indoor
Air CFM
(Std)
Temperature Air Entering Outdoor Coil (F db at 70% rh)
−10 0 1017203040475060
60
1050 Cap. 11.4 10.5 14.4 13.2 17.6 16.2 20.1 18.3 21.2 19.2 25.3 22.2 30.1 30.1 34.0 34.0 35.4 35.4 41.9 41.9
kW 2.48 2.56 2.65 2.71 2.74 2.85 2.98 3.09 3.12 3.31
1200 Cap. 11.6 10.7 14.6 13.4 17.9 16.4 20.3 18.5 21.4 19.4 25.6 22.4 30.4 30.4 34.3 34.3 35.8 35.8 42.2 42.2
kW 2.51 2.58 2.66 2.71 2.74 2.84 2.95 3.05 3.08 3.24
1350 Cap. 11.8 10.9 14.8 13.6 18.1 16.6 20.5 18.7 21.6 19.6 25.8 22.6 30.6 30.6 34.6 34.6 36.0 36.0 42.4 42.4
kW 2.55 2.61 2.68 2.73 2.75 2.84 2.94 3.03 3.06 3.19
70
1050 Cap. 10.8 9.96 13.9 12.8 17.3 15.8 19.8 18.1 20.9 19.0 25.0 21.9 29.7 29.7 33.5 33.5 34.9 34.9 41.2 41.2
kW 2.66 2.76 2.86 2.94 2.97 3.09 3.23 3.35 3.39 3.59
1200 Cap. 11.1 10.2 14.1 13.0 17.5 16.1 20.0 18.2 21.1 19.2 25.2 22.1 29.9 29.9 33.8 33.8 35.2 35.2 41.7 41.7
kW 2.69 2.78 2.87 2.93 2.96 3.07 3.19 3.30 3.34 3.52
1350 Cap. 11.3 10.4 14.3 13.2 17.7 16.2 20.2 18.4 21.3 19.4 25.4 22.3 30.2 30.2 34.1 34.1 35.5 35.5 42.0 42.0
kW 2.73 2.81 2.89 2.94 2.97 3.07 3.18 3.27 3.31 3.47
80
1050 Cap. 10.1 9.29 13.3 12.3 16.8 15.5 19.5 17.8 20.7 18.8 24.9 21.8 29.4 29.4 33.4 33.4 34.7 34.7 40.8 40.8
kW 2.84 2.97 3.10 3.19 3.23 3.37 3.53 3.67 3.71 3.91
1200 Cap. 10.3 9.52 13.6 12.5 17.1 15.7 19.8 18.0 21.0 19.1 25.2 22.0 29.7 29.7 33.8 33.8 35.1 35.1 41.3 41.3
kW 2.87 2.99 3.10 3.18 3.22 3.35 3.48 3.61 3.64 3.82
1350 Cap. 10.6 9.72 13.8 12.7 17.3 15.9 20.0 18.2 21.3 19.3 25.4 22.3 29.9 29.9 34.1 34.1 35.4 35.4 41.5 41.5
kW 2.91 3.02 3.12 3.19 3.22 3.34 3.46 3.57 3.61 3.75
LEGEND
Cap. — Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat)
db — Dry Bulb
kW — Total Power Input (Includes Compressor Motor Power Input, Outdoor-
Fan Motor Input, and Indoor-Fan Motor Input)
rh — Relative Humidity
NOTES:
1. indicates integrated ratings.
2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost
on the outdoor coil and the heat required to defrost it.
50ZH042
Temp (F)
Air Ent
Indoor
Coil
(edb)
Indoor
Air CFM
(Std)
Temperature Air Entering Outdoor Coil (F db at 70% rh)
−100 1017203040475060
60
1225 Cap. 13.4 12.4 16.9 15.5 20.7 19.0 23.7 21.6 25.2 22.9 29.8 26.1 35.2 35.2 40.3 40.3 42.4 42.4 49.7 49.7
kW 2.87 2.98 3.09 3.17 3.22 3.35 3.51 3.66 3.73 3.97
1400 Cap. 13.4 12.3 16.8 15.4 20.9 19.2 23.9 21.8 25.3 23.0 30.2 26.5 35.6 35.6 40.8 40.8 42.7 42.7 50.4 50.4
kW 2.90 3.00 3.10 3.18 3.22 3.34 3.48 3.62 3.67 3.90
1575 Cap. 13.3 12.3 17.0 15.6 21.1 19.4 24.2 22.1 25.6 23.2 30.5 26.8 36.0 36.0 41.2 41.2 43.0 43.0 50.9 50.9
kW 2.95 3.04 3.13 3.20 3.23 3.35 3.48 3.61 3.65 3.86
70
1225 Cap. 12.5 11.5 16.1 14.8 20.0 18.3 23.1 21.1 24.6 22.4 29.2 25.6 34.5 34.5 39.5 39.5 41.6 41.6 48.7 48.7
kW 3.06 3.19 3.32 3.43 3.47 3.63 3.80 3.97 4.04 4.30
1400 Cap. 12.5 11.5 16.0 14.7 20.2 18.5 23.4 21.3 24.8 22.5 29.6 25.9 34.9 34.9 40.0 40.0 41.8 41.8 49.3 49.3
kW 3.09 3.21 3.34 3.43 3.47 3.61 3.76 3.92 3.97 4.21
1575 Cap. 12.4 11.4 16.2 14.9 20.5 18.8 23.7 21.6 25.1 22.7 29.9 26.2 35.3 35.3 40.4 40.4 42.2 42.2 49.9 49.9
kW 3.14 3.25 3.36 3.45 3.48 3.61 3.75 3.89 3.94 4.16
80
1225 Cap. 11.4 10.5 15.1 13.9 19.1 17.5 22.4 20.4 24.0 21.7 28.6 25.1 33.8 33.8 38.7 38.7 40.8 40.8 47.7 47.7
kW 3.25 3.41 3.57 3.69 3.75 3.93 4.13 4.31 4.38 4.66
1400 Cap. 11.4 10.5 15.0 13.8 19.3 17.8 22.7 20.7 24.2 21.9 29.0 25.4 34.2 34.2 39.2 39.2 41.0 41.0 48.3 48.3
kW 3.29 3.44 3.59 3.70 3.74 3.91 4.08 4.25 4.30 4.56
1575 Cap. 11.4 10.4 15.2 14.0 19.7 18.0 23.0 21.0 24.5 22.2 29.3 25.7 34.6 34.6 39.6 39.6 41.4 41.4 48.9 48.9
kW 3.33 3.47 3.61 3.71 3.75 3.90 4.06 4.21 4.26 4.50
LEGEND
Cap. — Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat)
db — Dry Bulb
kW — Total Power Input (Includes Compressor Motor Power Input, Outdoor-
Fan Motor Input, and Indoor-Fan Motor Input)
rh — Relative Humidity
NOTES:
1. indicates integrated ratings.
2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost
on the outdoor coil and the heat required to defrost it.
13

Performance data (cont)
HEATING CAPACITIES (cont)
50ZH048
Temp (F)
Air Ent
Indoor
Coil
(edb)
Indoor
Air CFM
(Std)
Temperature Air Entering Outdoor Coil (F db at 70% rh)
−100 1017203040475060
60
1400 Cap. 15.4 14.2 18.9 17.3 22.8 20.9 26.0 23.7 27.6 25.0 33.1 29.0 39.6 39.6 45.3 45.3 47.2 47.2 55.6 55.6
kW 3.13 3.25 3.38 3.48 3.52 3.69 3.89 4.06 4.13 4.38
1600 Cap. 15.6 14.4 19.1 17.6 23.1 21.2 26.3 23.9 27.9 25.3 33.5 29.4 40.1 40.1 45.8 45.8 47.7 47.7 54.9 54.9
kW 3.17 3.28 3.40 3.49 3.53 3.68 3.86 4.02 4.08 4.26
1800 Cap. 15.9 14.6 19.3 17.8 23.3 21.4 26.5 24.2 28.2 25.5 33.8 29.6 40.4 40.4 45.8 45.8 47.4 47.4 53.0 53.0
kW 3.22 3.33 3.43 3.51 3.55 3.69 3.86 3.99 4.03 4.16
70
1400 Cap. 15.1 13.9 18.7 17.2 22.6 20.8 25.7 23.5 27.3 24.7 32.7 28.7 39.1 39.1 44.5 44.5 46.4 46.4 55.3 55.3
kW 3.39 3.54 3.70 3.81 3.87 4.05 4.27 4.46 4.53 4.84
1600 Cap. 15.3 14.1 18.9 17.4 22.9 21.0 26.0 23.7 27.6 25.0 33.1 29.0 39.5 39.5 45.0 45.0 46.9 46.9 54.9 54.9
kW 3.43 3.57 3.71 3.81 3.86 4.03 4.23 4.40 4.46 4.70
1800 Cap. 15.6 14.3 19.2 17.6 23.1 21.2 26.3 23.9 27.8 25.3 33.4 29.2 39.8 39.8 45.4 45.4 47.3 47.3 54.3 54.3
kW 3.47 3.61 3.74 3.83 3.88 4.03 4.21 4.38 4.44 4.61
80
1400 Cap. 14.5 13.4 18.4 16.9 22.4 20.6 25.5 23.2 27.0 24.5 32.3 28.3 38.5 38.5 43.9 43.9 45.7 45.7 54.7 54.7
kW 3.66 3.85 4.04 4.18 4.24 4.45 4.69 4.90 4.98 5.35
1600 Cap. 14.8 13.6 18.6 17.1 22.7 20.8 25.8 23.5 27.3 24.8 32.7 28.6 38.9 38.9 44.3 44.3 46.2 46.2 54.6 54.6
kW 3.69 3.87 4.05 4.17 4.22 4.42 4.63 4.82 4.89 5.18
1800 Cap. 15.1 13.9 18.9 17.4 22.9 21.0 26.0 23.7 27.6 25.0 33.0 28.9 39.2 39.2 44.7 44.7 46.6 46.6 54.6 54.6
kW 3.74 3.90 4.07 4.18 4.23 4.41 4.61 4.78 4.85 5.09
LEGEND
Cap. — Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat)
db — Dry Bulb
kW — Total Power Input (Includes Compressor Motor Power Input, Outdoor-
Fan Motor Input, and Indoor-Fan Motor Input)
rh — Relative Humidity
NOTES:
1. indicates integrated ratings.
2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost
on the outdoor coil and the heat required to defrost it.
50ZH060
Temp (F)
Air Ent
Indoor
Coil
(edb)
Indoor
Air CFM
(Std)
Temperature Air Entering Outdoor Coil (F db at 70% rh)
−100 1017203040475060
60
1800 Cap. 15.1 13.9 19.4 17.8 24.3 22.3 28.6 26.1 30.8 27.9 37.7 33.0 45.8 45.8 53.5 53.5 56.3 56.3 68.1 68.1
kW 3.48 3.64 3.82 3.97 4.05 4.28 4.56 4.79 4.88 5.26
2000 Cap. 15.1 13.9 19.4 17.8 24.6 22.6 28.8 26.3 30.9 28.1 38.0 33.3 46.3 46.3 53.9 53.9 56.5 56.5 68.7 68.7
kW 3.53 3.69 3.87 4.01 4.08 4.31 4.57 4.80 4.88 5.24
2250 Cap. 15.1 13.9 19.8 18.2 25.2 23.1 29.3 26.8 31.5 28.5 38.7 33.9 47.1 47.1 54.7 54.7 57.3 57.3 69.8 69.8
kW 3.60 3.76 3.94 4.08 4.14 4.36 4.62 4.83 4.91 5.26
70
1800 Cap. 14.4 13.2 18.7 17.2 23.7 21.8 28.0 25.5 30.2 27.4 37.0 32.4 44.9 44.9 52.5 52.5 55.2 55.2 66.7 66.7
kW 3.71 3.90 4.10 4.25 4.33 4.59 4.88 5.13 5.23 5.63
2000 Cap. 14.3 13.2 18.7 17.2 24.0 22.0 28.3 25.8 30.4 27.5 37.3 32.7 45.3 45.3 52.8 52.8 55.4 55.4 67.3 67.3
kW 3.76 3.94 4.14 4.29 4.36 4.61 4.89 5.12 5.21 5.60
2250 Cap. 14.3 13.2 19.0 17.5 24.2 22.2 28.7 26.2 30.8 28.0 37.9 33.2 46.1 46.1 53.6 53.6 56.1 56.1 68.3 68.3
kW 3.83 4.01 4.19 4.34 4.42 4.66 4.92 5.15 5.23 5.60
80
1800 Cap. 13.5 12.4 17.8 16.4 22.9 21.1 27.2 24.8 29.3 26.6 36.2 31.7 43.9 43.9 51.4 51.4 54.2 54.2 65.3 65.3
kW 3.97 4.18 4.40 4.57 4.65 4.93 5.24 5.51 5.62 6.04
2000 Cap. 13.5 12.4 17.8 16.4 23.2 21.3 27.5 25.1 29.6 26.8 36.6 32.0 44.4 44.4 51.8 51.8 54.4 54.4 65.9 65.9
kW 4.02 4.22 4.43 4.60 4.67 4.94 5.24 5.49 5.59 5.99
2250 Cap. 13.5 12.4 18.1 16.7 23.6 21.7 27.9 25.5 30.0 27.2 37.1 32.5 44.9 44.9 52.4 52.4 54.9 54.9 66.7 66.7
kW 4.08 4.28 4.49 4.64 4.72 4.98 5.26 5.50 5.59 5.98
LEGEND
Cap. — Heating Capacity (1000 Btuh) (Includes Indoor-Fan Motor Heat)
db — Dry Bulb
kW — Total Power Input (Includes Compressor Motor Power Input, Outdoor-
Fan Motor Input, and Indoor-Fan Motor Input)
rh — Relative Humidity
NOTES:
1. indicates integrated ratings.
2. Integrated capacity is maximum (instantaneous) capacity less the effect of frost
on the outdoor coil and the heat required to defrost it.
14

WET COIL PRESSURE DROP
UNIT SIZE
50ZH AIRFLOW (cfm) PRESSURE DROP (in. wg)
024
600 0.02
700 0.05
800 0.06
900 0.07
030 900 0.06 1000 0.06
1200 0.08
036
1000 0.04
1200 0.05
1400 0.07
1600 0.08
042
1000 0.04
1200 0.06
1400 0.08
1600 0.09
048 1400 0.07 1600 0.08
1800 0.09
060
1700 0.07
1800 0.08
2100 0.09
2300 0.10
MULTIPLICATION FACTORS
HEATER kW
RATING VOLTAGE
DISTRIBUTION
V/3/60 MULTIPLICATION
FACTOR
240 200 0.69
208 0.75
230 0.92
240 1.00
480 440 0.84 460 0.92
480 1.00
Example: 15.0 kW (at 240 v) heater on 208 v
= 15.0 (.75 mult factor)
= 11.25 capacity at 208 v
FILTER PRESSURE DROP (in. wg)
UNIT
SIZE
50ZH
FILTER
SIZE
(in.)
CFM
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
024-042 24 × 24 0.06 0.07 0.08 0.08 0.09 0.09 0.09 0.10 0.11 0.12 0.14 0.15 ———————
048,060 24×30—————— — —0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18
ACCESSORY ELECTRIC HEAT PRESSURE DROP (in. wg)
CFM
Heater kW 600 800 1000 1200 1400 1600 1800 2000 2200
5-20 0.06 0.08 0.10 0.13 0.15 0.18 0.20 0.23 0.25
15

Performance data (cont)
DRY COIL AIR DELIVERY* — HORIZONTAL DISCHARGE (Deduct 10% for 208 Volt Operation)
UNIT
50ZH MOTOR SPEED AIR DELIVERY
230 AND 460 VOLT HORIZONTAL DISCHARGE
External Static Pressure (in. wg)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
024
Low Watts 288 285 282 279 274 268 261 — —
CFM 875 820 802 734 668 582 478 — —
Med Watts 390 383 378 369 360 350 340 — —
CFM 1131 1090 1038 978 917 830 721 — —
High Watts 528 520 510 495 480 460 450 — —
CFM 1391 1338 1285 1200 1115 1018 920 — —
030
Low Watts 288 285 282 279 274 268 261 — —
CFM 875 820 802 734 668 582 478 — —
Med Watts 390 383 378 369 360 350 340 — —
CFM 1131 1090 1038 978 917 830 721 — —
High Watts 528 520 510 495 480 460 450 — —
CFM 1891 1338 1285 1200 1115 1018 920 — —
036
Low Watts 450 435 420 400 380 335 326 311 —
CFM 1231 1218 1204 1120 1008 950 863 751 —
Med Watts 470 450 445 410 388 359 338 321 —
CFM 1302 1264 1205 1163 1081 940 873 783 —
High Watts 660 635 610 575 540 505 485 460 —
CFM 1700 1660 1581 1450 1297 1190 1095 989 —
042
Low Watts 478 458 440 411 378 350 327 317 —
CFM 1303 1270 1224 1179 1126 1022 911 816 —
Med Watts 481 468 450 438 404 370 338 320 —
CFM 1310 1280 1241 1181 1110 1022 943 811 —
High Watts — 798 678 647 618 578 540 500 460
CFM — 1736 1688 1618 1510 1421 1309 1187 1060
048 Low Watts — — 801 760 730 688 650 600 570
CFM — — 1898 1841 1757 1682 1564 1429 1333
High Watts — — 870 842 818 782 696 632 628
CFM — — 2000 1903 1799 1718 1625 1446 1365
060†
Low Watts 890 850 810 790 735 680 580 480 422
CFM 1834 1820 1791 1762 1703 1640 1415 1159 950
Med Watts 1040 1018 1000 950 890 835 790 650 580
CFM 2230 2102 2025 1960 1901 1855 1752 1468 1121
High Watts 1073 1038 1001 958 896 840 800 691 575
CFM 2230 2202 2160 2122 2052 1926 1791 1588 1202
*Air delivery values are based on operating voltage of 230 v or 460 v,
dry coil, without filter or electric heater. Deduct wet coil, filter, and elec-
tric heater pressure drops to obtain external static pressure available
for ducting.
†460-v motors have 2 speeds (size 060 only).
NOTES:
1. Do not operate the unit at a cooling airflow that is less than 350 cfm
for each 12,000 Btuh of rated cooling capacity. Evaporator-coil frost-
ing may occur at airflows below this point.
2. Dashes indicate portions of the table that are beyond the blower mo-
tor capacity or are not recommended.
16

Electrical data
UNIT
50ZH NOMINAL V-PH-Hz IFM TYPE
VOLTAGE
RANGE COMPRESSOR OFM
FLA IFM FLA HEATER PACKAGE NO.
ELECTRIC
HEAT POWER SUPPLY DISCONNECT SIZE
Min Max RLA LRA Nominal
kW* FLA MCA MOCP FLA LRA
024 208/230-1-60 Std 187 254 12.8 63.0 0.9 2.4 None — — 19.3/ 19.3 25/ 25† 19/ 19 70/ 70 CPHEATER026A00 3.8/ 5.0 18.3/20.8 42.2/ 45.3 45/ 50† 40/ 42 89/ 91
CPHEATER024A00 7.5/10.0 36.1/41.7 64.4/ 71.4 70/ 80 60/ 66 107/112
030
208/230-1-60 Std 187 254 14.4 73.0 1.5 2.4 None — — 21.9/ 21.9 30/ 30† 21/ 21 83/ 83
CPHEATER026A00 3.8/ 5.0 18.3/20.8 44.8/ 47.9 45/ 50† 42/ 45 101/103
CPHEATER024A00 7.5/10.0 36.1/41.7 67.0/ 74.0 70/ 80 63/ 69 119/124
CPHEATER040A00 11.3/15.0 54.3/62.5 89.8/100.0 90/110 83/ 93 137/145
208/230-3-60 Std 187 254 10.0 63.0 1.5 5.8 None — — 16.8 20† 16 73
CPHEATER029A00 3.8/ 5.0 10.5/12.0 29.9/ 31.8 35/ 35† 29/ 30 83/ 85
CPHEATER024A00 7.5/10.0 20.8/24.1 42.8/ 46.9 45/ 50† 40/ 44 93/ 97
CPHEATER031A00 11.3/15.0 31.4/36.1 56.1/ 61.9 60/ 70 53/ 58 104/109
036
208/230-1-60 Std 187 254 17.7 93.0 1.5 2.8 None — — 26.4/ 26.4 35/ 35† 25/ 25 103/103
CPHEATER026A00 3.8/ 5.0 18.3/20.8 49.3/ 52.4 50/ 60† 46/ 49 121/123
CPHEATER024A00 7.5/10.0 36.1/41.7 71.6/ 78.6 80/ 80 67/ 73 139/144
CPHEATER040A00 11.3/15.0 54.3/62.5 94.3/104.6 100/110 88/ 97 157/165
208/230-3-60 Std 187 254 10.3 77.0 1.5 2.8 None — — 17.2/ 17.2 20/ 20† 17/ 17 87/ 87
CPHEATER029A00 3.8/ 5.0 10.5/12.0 30.3/ 32.2 35/ 35† 29/ 31 97/ 99
CPHEATER030A00 7.5/10.0 20.8/24.1 43.2/ 47.3 45/ 50† 41/ 45 107/111
CPHEATER031A00 11.3/15.0 31.4/36.1 56.4/ 62.3 60/ 70 53/ 58 118/123
460-3-60 Std 414 508 5.7 39.0 0.8 2.0 None — — 9.9 15† 10 46
CPHEATER034A00 5.0 6.0 17.4 20† 17 52
CPHEATER035A00 10.0 12.0 24.9 25† 24 58
CPHEATER036A00 15.0 18.0 32.4 35† 30 64
042
208/230-1-60 Std 187 254 21.5 103.0 1.5 2.8
None — — 31.2/ 31.2 40/ 40† 30/ 30 113/113
CPHEATER026A00 3.8/ 5.0 18.3/20.8 54.1/ 57.2 60/ 60† 51/ 54 131/133
CPHEATER024A00 7.5/10.0 36.1/41.7 76.3/ 83.3 80/ 90 71/ 78 149/154
CPHEATER040A00 11.3/15.0 54.3/62.5 99.1/109.3 100/110 92/102 167/175
CPHEATER028A00 15.0/20.0 72.1/83.3 121.3/135.3 125/150 113/125 185/196
208/230-3-60 Std 187 254 12.4 88.0 1.5 2.8
None — — 19.8/ 19.8 25/ 25† 19/ 19 98/ 98
CPHEATER029A00 3.8/ 5.0 10.5/12.0 32.9/ 34.8 35/ 35† 31/ 33 108/110
CPHEATER030A00 7.5/10.0 20.8/24.1 45.8/ 49.9 50/ 50† 43/ 47 118/122
CPHEATER031A00 11.3/15.0 31.4/36.1 59.1/ 64.9 60/ 70 55/ 61 129/134
CPHEATER041A00 15.0/20.0 41.6/48.1 71.8/ 79.9 80/ 80 67/ 75 139/146
460-3-60 Std 414 508 6.8 44.0 0.8 2.0
None — — 11.3 15† 11 51
CPHEATER034A00 5.0 6.0 18.8 20† 18 57
CPHEATER035A00 10.0 12.0 26.3 30† 25 63
CPHEATER036A00 15.0 18.0 33.8 35† 32 89
CPHEATER037A00 20.0 24.1 41.4 45† 39 75
048
208/230-1-60 Std 187 254 28.2 129.0 1.5 4.2
None — — 41.0/ 41.0 50/ 50† 39/ 39 143/143
CPHEATER038A00 3.8/ 5.0 18.3/20.8 63.8/ 67.0 70/ 70 60/ 63 161/163
CPHEATER024A00 7.5/10.0 36.1/41.7 86.1/ 93.1 90/100 81/ 87 179/184
CPHEATER040A00 11.3/15.0 54.3/62.5 108.8/119.1 110/125 101/111 197/205
CPHEATER028A00 15.0/20.0 72.1/83.3 131.1/145.1 150/150 122/135 215/226
208/230-3-60 Std 187 254 13.5 99.0 1.5 4.2
None — — 22.6/ 22.6 30/ 30† 22/ 22 113/113
CPHEATER029A00 3.8/ 5.0 10.5/12.0 35.7/ 37.6 40/ 40† 34/ 36 123/125
CPHEATER030A00 7.5/10.0 20.8/24.1 48.6/ 52.7 50/ 60† 46/ 50 133/137
CPHEATER031A00 11.3/15.0 31.4/36.1 61.8/ 67.7 70/ 70 58/ 64 144/149
CPHEATER041A00 15.0/20.0 41.6/48.1 74.6/ 82.7 80/ 90 70/ 77 154/161
460-3-60 Std 414 508 8.2 129.0 0.8 4.2
None — — 15.2 20† 15 141
CPHEATER034A00 5.0 6.0 22.7 25† 22 147
CPHEATER035A00 10.0 12.0 30.2 35† 29 153
CPHEATER036A00 15.0 18.0 37.7 40† 36 159
CPHEATER037A00 20.0 24.1 45.3 50† 43 165
060
208/230-1-60 Std 187 254 27.7 170.0 3.1 6.2
None — — 43.9/ 43.9 60/ 60† 43/ 43 192/192
CPHEATER038A00 3.8/ 5.0 18.3/20.8 66.8/ 69.9 70/ 70 64/ 66 210/213
CPHEATER024A00 7.5/10.0 36.1/41.7 89.1/ 96.1 90/100 84/ 91 228/233
CPHEATER040A00 11.3/15.0 54.3/62.5 111.8/122.1 125/125 105/114 246/254
CPHEATER028A00 15.0/20.0 72.1/83.3 134.1/148.1 150/150 125/138 264/275
208/230-3-60 Std 187 254 15.9 124.0 3.1 6.2
None — — 29.2/ 29.2 35/35† 29/ 29 146/146
CPHEATER029A00 3.8/ 5.0 10.5/12.0 42.3/ 44.2 45/45† 41/ 43 156/158
CPHEATER030A00 7.5/10.0 20.8/24.1 55.2/ 59.3 60/60† 53/ 57 167/170
CPHEATER031A00 11.3/15.0 31.4/36.1 68.4/ 74.3 70/80 65/ 70 177/182
CPHEATER041A00 14.9/19.9 41.4/47.9 80.9/ 89.1 90/90 77/ 84 187/194
460-3-60 Std 414 508 8.0 60.0 1.5 3.2
None — — 14.7 20† 15 68
CPHEATER034A00 5.0 6.0 22.2 25† 22 74
CPHEATER035A00 10.0 12.0 29.7 30† 28 80
CPHEATER036A00 15.0 18.0 37.2 40† 35 86
CPHEATER037A00 20.0 24.1 44.8 45† 42 93
LEGEND
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM — Indoor-Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
OFM — Outdoor-Fan Motor
RLA — Rated Load Amps
*Heater capacity (kW) is based on heater voltage of 208 v, 240 v or 480 v. If power distribution
voltage to unit varies from rated heater voltage, heater kW will vary accordingly.
†Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load and equipment
(refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be
fuse or HACR 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 percentage of voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x average voltage
Example: Supply voltage is 240-3-60
AB = 235 v
BC = 242 v
AC = 236 v 235 + 242 + 236
Average voltage = 3
= 238
Determine maximum deviation from average voltage:
(AB) 238 − 235=3v
(BC) 242 − 238=4v
(AC) 238 − 236=2v
Maximum deviation is 4 v.
Determine percentage of voltage imbalance:
4
% Voltage imbalance = 100 x 238
= 1.68%
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.
17

Typical wiring schematic
LEGEND
AWG — American Wire Gage
C—Contactor, Compressor
CAP — Capacitor
CB — Circuit Breaker
COMP — Compressor Motor
CTD — Compressor Time
Delay
DB — Defrost Board
DFT — Defrost Thermostat
DR — Defrost Relay
DT — Discharge Thermostat
EQUIP — Equipment
FU — Fuse
GND — Ground
HR — Heater Relay
IFM — Indoor Fan Relay
IFR — Indoor Fan Motor
LPS — Low-Pressure Switch
OFM — Outdoor-Fan Motor
PL — Plug
QT — Quadruple Terminal
RVS — Reversing Valve
Solenoid
TDR — Time Delay Relay
TRAN — Transformer
Field Splice
Marked Wire
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Splice (Marked)
Plug
Receptable
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To indicate common potential
only; not to represent wiring.
NOTES:
1. If any of the original wire furnished must
be replaced, it must be replaced with
type 90° C wire or its equivalent.
2. Thermostat: HH07AT171
Subbase: HH92AZ188
3. Set heat anticipator at .6.
4. Use 75 deg. C copper conductors only.
18

Typical wiring schematic (cont)
Controls
Sequence of operation
When power is supplied to unit, the transformer (TRAN) is
energized.
Cooling — With the thermostat subbase in the cooling po-
sition, and when the space temperature comes within 2° F
of the cooling set point, 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 continues to rise, the second
stage of the thermostat makes, closing circuit R-Y. When
compressor time delay (5 ± 2 minutes) is completed, a cir-
cuitis made tocontactor (C), startingthe compressor (COMP)
and outdoor-fan motor (OFM). Circuit R-G is made at the
same time, energizing the indoor-fan relay (IFR) and start-
ing the indoor-fan motor (IFM) after a 1-second delay.
When the thermostat is satisfied, contacts open, deener-
gizing C. The COMP and OFM stop, and the IFM stops
after a 30-second delay.
Heating — On a call for heat, thermostat makes circuits
R-Y and R-G.
When compressor time delay (5 ± 2 minutes) is com-
pleted, a circuit is made to C, starting COMP and OFM.
Circuit R-G also is completed, energizing IFR and starting
IFM after a 1-second delay.
Should room temperature continue to fall, circuit R-W is
madethrough second-stage thermostat bulb. If optional elec-
tric 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 re-
lay; motors and heaters deenergize. The IFM may be con-
trolled by a time-delay relay that keeps the fan on for
30 seconds.
Defrost — Defrost board (DB) is a time and temperature
control, which includes a field-selectable time period be-
tween checks for defrost (30, 50, and 90 minutes). Elec-
tronic timer and defrost cycle start only when contactor is
energized and defrost thermostat (DFT) is closed.
Defrostmode isidentical tocooling mode, except outdoor-
fan motor stops and a bank of optional electric heat turns
on to warm air supplying the conditioned space.
ELECTRIC HEATER WIRING
19

Typical piping and wiring
HORIZONTAL DISCHARGE
COMPOSITE
RUST-PROOF
BASE PAN
POWER AND
LOW-VOLTAGE
ENTRY
CONDENSATE
DRAIN
CONNECTION
DISCONNECT
PER NEC*
(UNITAND
ELECTRIC
HEATER)
INDOOR
THERMOSTAT
RETURN
AIR
TOP
COVER
FROM
POWER
SOURCE
FIELD-SUPPLIED PAD
LEGEND
Power Wiring
Control Wiring
Outdoor Airflow
Indoor Airflow
*Separate disconnect per NEC (National Electrical Code) required
for electric heater when single-point connection is not used.
20