Bryant 551A, 558F, 551B User Manual

COMMERCIAL SINGLE PACKAGE ROOFTOP ELECTRIC COOLING UNITS

551B036-072 558F036-073

551B090-150 551A155,180 558F180-210 559F180-216

558F090-150

551A, 551B, 558F, 559F

Pac

and

Plus Series

Sizes 036-300

3 to 25 Tons

Dura

Pac

558F240 559F240-300

FEATURES/BENEFITS

• Efficient cooling using hermetic compressors.

• Full range of electric heat sizes available — exactly the right size for your needs.

• Accessory hydronic glycol heating coils are available for unit sizes 155-300.

• High reliability — non-corrosive condensate pans (036-150), prepainted cabinets and primed interior panels, and all units are fully protected by internal safeties.

• Quietest operation in the industry — all compressors mounted on independent vibration isolators. Standard belt-driven evaporator fan motors on all units (except 558F036-060).

• Ease of maintenance achieved by standard size filters, toolless filter access, simple compressor access, permanently lubricated fan motors, optional disconnect switch, optional 115-v convenience outlet, and optional hinged access panels.

• Perfect Humidity™ dehumidification package (not available on 558F036-150 units). This factory-installed option improves the dehumidification capability of the rooftop unit and helps control humidity levels in the conditioned space.

BRYANT MEANS TOP QUALITY AND RELIABILITY —

component utilized in these units is designed and tested for a minimum of 15 years operation under the harshest conditions.

Every unit is thoroughly run tested at the factory in each operating mode and evacuated prior to final charging. Every coil is leak-tested with helium particles. Automated run testing allows accurate impartial tests and measurements which are second to none in the industry.

Each

558F300

Each unit contains a factory printout indicating tested pressures, amperages, dates, and inspectors, providing certification of the unit’s status at the time of manufacture.

Units are equipped with valuable safety controls designed to monitor and protect the unit for life. The standard safeties include:

• low-pressure/loss-of-charge switch

• high-pressure switch

• freeze-protection thermostat

• internal compressor overload

• exclusive Cycle-LOC™ circuit board that provides compressor anti-cycling (except 558F036-150)

• refrigerant filter drier

The cabinet is constructed of galvanized steel, bonderized and coated with a prepainted baked enamel finish. The paint finish is a non-chalking type, and is capable of exceeding Federal Test Method Standard No. 141 (Method 6061) 500-Hour Salt Spray Test. In addition, all internal cabinet panel surfaces are primed, allowing the entire unit to have a longer life and more attractive appearance.

EASY MAINTENANCE AND INSTALLATION All Units are Factory Shipped in the Vertical Discharge

Configuration

sory curb fits sizes 036-072; accessory curbs fit sizes 090-150 and 155-300.) The contractor can order and install the roof curbs early in the construction stage, before decisions on size requirements have been made.

All Units Feature Roll-Formed Baserail

slots on 3 sides of the unit and rigging holes for easier maneuvering and installation. Stretch-wrap packaging protects the unit during shipment and storage.

for fit-up to standard roof curbs. (One acces-

design with forklift

Form No. PDS 558F.36.2

Units are Easily Converted

tions to make retrofit and add-on jobs easier. To convert from vertical to horizontal discharge, simply relocate 2 panels (036-150).

The same basic unit can be used for a variety of applications and can be quickly modified at the jobsite. Standard highperformance, belt-driven, evaporator-fan motors enable the 551B036-150 units to operate in most ductwork configurations.

Ductwork Connections are Simplified

aspect ratio. On vertical discharge units, ductwork attaches directly to the roof curb.

Thru-the-Bottom Service Connection

and control wiring to be routed through the unit basepan and roof curb (if installed), thereby minimizing roof penetrations (to prevent water leaks). Both power and control connections are made on the same side of the unit to simplify installation.

The Non-Corrosive, Sloped, Condensate Drain Pan

conformance with ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning Engineers) Standard 62 to meet many Indoor-Air Quality (IAQ) specifications. The condensate drain pan offers both bottom and end drain capability to minimize roof penetrations. The bottom drain can be used in conjunction with the thru-the-bottom connections. An external trap must be field supplied (035-150).

Standard 2-in. Throwaway Filters

through a removable filter access panel located directly above the air intake hood; no tools are required to change the filters.

All Units are Designed with a Single Continuous Top Piece

to eliminate leaking at the seams or gasketing (036-150).

Belt-Driven Evaporator-Fan Motors on All Sizes

mum on-site flexibility without changing motors or drives (except 558F036-060).

Low-Voltage Wiring Connections

terminal board which is conveniently located for quick simple access.

Single-Point Electrical Power Connections

wire estimating and connections.

Field-Installed Accessory Electric Heaters

wide range of capacities. Single-point wiring kit makes installation simple.

QUIET, EFFICIENT OPERATION AND DEPENDABLE PERFORMANCE

All Units are Equipped with Compressors

metic with internal vibration isolators for extremely quiet and highly efficient operation. Compressors are mounted on an independent plate for additional sound integrity and structural support. Efficient condenser fan and motor design permits operation at low sound levels.

Totally Enclosed Condenser Fan Motors

lubricated bearings provide additional dependability.

All Coils Use State-of-the-Art Internally Enhanced Copper Tubing.

factory. Condenser coils have louvered, aluminum lanced fins to provide maximum heat transfer for optimum efficiency and easy cleaning.

Refrigerant Circuit Protection

have standard:

Coils are thoroughly leak and pressure tested at the

1. Loss-of-charge/low-pressure protection switch which allows operation at lower ambient conditions while protecting against low-charge operation.

2. Freeze-protection thermostat, which protects against evaporator coil frost build-up.

3. High-pressure switch, which protects against above normal operating pressure.

from vertical to horizontal applica-

by the logical 2 to 1

capability allows power

is in

are easily accessed

allow maxi-

are easily made due to the

permit easier

are available in a

that are fully her-

and permanently

ensures dependability. All units

4. Filter driers, which trap moisture and debris in the refrigeration system.

5. A fixed orifice metering system precisely controls refrigerant flow (sizes 036-150), preventing slugging and floodback, while maintaining optimum unit performance by metering the circuits individually. TXV meeting system on sizes 155-300.

Two Independent Compressor Circuits

units) provide pinpoint comfort control, improved efficiency, and back-up capability.

BRYANT CONTROLS ADD RELIABILITY, EFFICIENCY, AND SIMPLIFICATION

The Standard Control System

ventional and programmable thermostats.

Patented Cycle-LOC™ Protection System

tion against compressor cycling by monitoring compressor current (except 558F036-150). When a lack of compressor current exists, the Cycle-LOC circuit board locks out the compressors. Cycle-LOC may be manually reset by simply switching the thermostat to OFF, and back to the Cooling or AUTO modes. No use of the unit power disconnect switch is required.

INDOOR-AIR QUALITY (IAQ)

Bryant rooftop units utilize certain key features that assist in improving the quality of the building air. Sloped condensate pans eliminate possible biological growth in the rooftop unit. A face-split indoor coil design (all 090-300 size units) proves effective in additional moisture removal from the supply air. Two-in. filters are standard in all rooftop units with an optional filter status sensor available.

Another Optional Indoor-Air Quality (IAQ) Feature

Perfect Humidity™ dehumidification package (except 558F036-

150). This is a factory-installed option that provides increased dehumidification by cooling the hot liquid refrigerant leaving the condenser coil. The Perfect Humidity option consists of a subcooling coil located on the leaving-air side of the evaporator coil. The location of this coil in the indoor airstream enhances the latent capacity of the units by as much as 40%. Many buildings suffer from humidity damage or poor indoor air quality due to humid conditions. The improved latent capacity provided by the Perfect Humidity option reduces the building’s humidity, eliminating potential property damage and making the space more comfor table.

The Perfect Humidity option makes units ideal IAQ rooftops for hot and humid regions. The operation of the Perfect Humidity package can be controlled by a field-installed, wall-mounted humidistat, or light commercial thermidistat. The circuit activates only when needed (using the accessory humidistat) as opposed to some dehumidification systems that operate continuously. The humidistat can be set for any humidity level between 20% and 80% relative humidity.

SERVICEABILITY Servicing a Rooftop Unit has Never Been Easier

new factory-installed Hinged Panel Option (except 558F036-

150). This option includes hinged access panels for the filter, compressor, evaporator-fan motor, and control box areas. These panels provide quick and simple access to the major components by simply unlocking and swinging open the different panels. Each hinged access panel is permanently attached to the rooftop unit, eliminating the problem of access panels being dropped and creating a hole in the roof (potentially causing a water leak). This type of damage could void any warranty offered for a new roof.

Standardized Components

are found in all safety devices, condenser-fan motors, and control boards. This allows for greater inventory control, familiarity, and fewer stocked parts.

is readily adaptable to all con-

for the complete line of products

(all 090-300 size

provides protec-

is the

with the

Easily Accessible Refrigerant Access Ports

charge, suction, and liquid lines permit easy and accurate measurements.

Resettable 24-V Circuit Breaker (Sizes 090-150)

for error without replacing transformers or fuses.

Single-Side Utility Connections

form any necessary service.

provide easy access to per-

on all dis-

allows room

TABLE OF CONTENTS

Page

Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-13

Typical Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . 14-18

Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . .19,20

Application Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-25

558F036-150

Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . 26

ARI Capacity Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27,28

Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-32

Accessory Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . .33,34

Selection Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36-64

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65-70

551B036-150

Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . 71

ARI Capacity Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72,73

Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . .74,75

Accessory Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . .76,77

Selection Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79-97

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98-105

Guide Specifications — Sizes 036-150 559F180-300

Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . 109

. . . . . . . . . . . 106-108

Color-Coded Wires Indoor Fan Motors

door to facilitate servicing and adjusting after installation.

Compressors and Safety Switches are Easily Accessible

troubleshooting and system analysis.

ARI Capacity Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . .109,110

Physical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111,112

Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 113,114

Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . .115-117

Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119-126

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .127,128

558F180-300

Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . 129

ARI Capacity Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . .129,130

Physical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131,132

Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . .133-135

Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . .136-138

Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140-147

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .147,148

551A155-180

Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . 149

ARI Capacity Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . .149,150

Physical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151,152

Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . .154-156

Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . .158-163

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Guide Specifications — Sizes 155-300

permit easy tracing and diagnostics.

are accessible through a single access

for

Page

. . . . . . . . . . .165-168

OPTIONS AND ACCESSORIES

100% Open Two-Position Damper (036-150) 25% Open Two-Position Damper (036-150) Barometric Relief Damper (150-300)

(Not for use with horizontal roof curb) Condenser Coil Grille (036-150) Condenser Coil Hail Guard Assembly (036-300) Convenience Outlet Copper Fins Indoor and Outdoor Coil Copper Fins Outdoor Coil Double Wall in Unit Airstream (155-300) Durablade Integrated Economizer (036-150) E-Coat Outdoor Coil (Aluminum) EconoMi$er Electronic Programmable Thermostat Enthalpy or Differential Enthalpy Sensor Fan/Filter Status Flue Discharge Deflector (036-150) Flue Shield (036-150) Head Pressure Controls High-Static Motor and Drive (except 208/230 v, 1 phase) Hinged Access Panels (except for 558F036-150) Horizontal Adapter Curb (155-300) Hot Gas Bypass (155-300) Indoor Air Quality (CO

(EconoMi$er Only) Johnson METASYS Control Light Commercial Thermidistat

(for use with Perfect Humidity™ package) Low Ambient Kit Low NO LP (Liquid Propane) Conversion Kit Manual Outdoor-Air Damper Perfect Humidity Dehumidification Package

(except for 558F036-150) Motormaster® I, II, III, IV Head Pressure

Control (Cycle Control) Novar Control Power Exhaust (no barometric relief 150-300) Power Exhaust Transformer for 575 v (036-150) Pre-coat Aluminum Fins on Outdoor Coil Return Air Temperature Sensor

(EconoMi$er Only) Roof Curbs Smoke Detectors Thermidistat Thermostats and Subbases Thru-the-Bottom Utility Connections (036-150) Time Guard® II Control Circuit Unit-Mounted Non-Fused Disconnect UVC Lamps Winter Start Time Delay (155-300)

*Factory-installed.

†Field-installed.

**Design Enhancement Center (DEC) special order only.

NOTES:

1. Refer to unit price pages or contact your local representative for accessory and option package information.

2. Some options may increase product lead times.

(036-060)

ITEM OPTION* ACCESSORY†

X X X X

X XX

X X

) Sensor

X**

X** X

X X** X

X X

X X X X X X

X X

X X X X

OPTIONS AND ACCESSORIES (cont)

LOW AMBIENT CONTROLS

Standard units are designed to operate in cooling at outdoor temperatures down to 25 F for size 036-150 units, 40 F for size 150-300 units. With accessory Motormaster® control (condenser-fan cycling) units can operate at outdoor temperatures down to –20 F. The head pressure controls, which mount in the condenser section, control the condenser-fan motor to maintain correct condensing temperature.

MOTORMASTER II CONTROL

(CONDENSER FAN CYCLING)

MOTORMASTER IV CONTROL

(CONDENSER FAN CYCLING)

MOTORMASTER I, III CONTROL

(CONDENSER FAN SPEED MODULATOR)

BAROMETRIC RELIEF/POWER EXHAUST

When used with accessory/optional economizer, the barometric relief or power exhaust accessory helps to relieve building overpressurization.

NOTE:

curb.

(155-300 Shown)

This is not available with horizontal supply adapter

OPTIONS AND ACCESSORIES (cont)

DURA-SHIELD

Condenser coil options are available to match coil construction to site conditions for the best corrosion durability. Pre-coated coils provide protections in mild coastal environments. All copper coils are best suited for moderate coastal applications, while E-coated coils provide superior protection in severe coastal and industrial applications.

CONDENSER COIL OPTIONS

CONDENSER COIL PROTECTION APPLICATIONS

DESCRIPTION

Dura-Shield

(

Standard, Al/Cu Pre-Coated Al/Cu Cu/Cu E-Coated Al/Cu E-Coated Cu/Cu

Al/Cu — Cu/Cu —

Dura-Shield

E-Coated — Pre-Coated —

—

Option)

LEGEND

Aluminum Fin with Copper Tube Coil Copper Fin with Copper Tube Coil Family of Coil Protection Options Extremely Flexible and Durable Epoxy Coating Uniformly Applied to the Coil Surfaces. Epoxy Coating Applied to Fin Stock Material

Standard,

Non-Corrosive

Mild

Coastal

ENVIRONMENT

Moderate

Coastal

Severe

Coastal

Industrial

Combined Coastal

and Industrial

Perfect Humidity™ DEHUMIDIFICATION PACKAGE

(036-150)

The Perfect Humidity dehumidification package is a factory-installed option that provides increased dehumidification by cooling the hot liquid refrigerant leaving the condenser coil. The Perfect Humidity package consists of a subcooling coil located on the leaving-air side of the evaporator coil. The location of this coil in the indoor airstream enhances the latent capacity of the units by as much as 40%. The Perfect Humidity package includes the subcooling coil and low-pressure switches, and operation can be controlled by a field-installed, wall-mounted humidistat or thermidistat.

STANDARD INDOOR COIL

DEHUMIDIFICATION COIL

(155-300)

OPTIONS AND ACCESSORIES (cont)

CONTROLLER

BAROMETRIC RELIEF DAMPERS

OUTDOOR AIR TEMPERATURE SENSOR

GEAR-DRIVEN DAMPER

ACTUATOR

ECONOMI$ER PLUG

LIGHT COMMERCIAL THERMIDISTAT

Field-installed, wall-mounted device combines temperature and humidity control in one device. The dehumidifier output is used to control the Perfect Humidity dehumidification package. The occupied space humidity has a set point range between 50% and 90% relative humidity and provides constant fan operation in occupied mode.

TIME GUARD® CONTROL

Time Guard II Control automatically prevents compressor from restarting for at least 5 minutes after a shutdown. Accessory prevents short cycling of compressor if thermostat is changed rapidly. Time Guard II control mounts in the control compar tment of unit.

DURABLADE ECONOMIZER

BRYANT COMMERCIAL THERMOSTAT

Designed specifically for use with Bryant commercial systems, this Bryant programmable thermostat features LED occupied/ unoccupied displays and setback mode which can override continuous fan operation.

ECONOMI$ER (036-150)

Exclusive Durablade economizer damper design saves energy while providing economical and reliable cooling. A sliding plate on the face of the economizer controls the amount of outdoor air entering the system. When the sliding plate is closed, it provides a leakproof seal which prevents ambient air from seeping in or conditioned air from seeping out. It can be easily adjusted for 100% outdoor air or any proportions of mixed air. Design includes standard dry-bulb control and 30% barometric relief capability.

Factory-installed EconoMi$er utilizes a microprocessor-based control, gear drive damper system, low pressure drop characteristics, built-in spring return (for close upon power loss), and an integral barometric damper.

EconoMi$er is available for vertical ductwork applications

NOTE:

factory installed. A vertical EconoMi$er, 2-stage power exhaust and dedicated hori-

zontal EconoMi$er are available for field installation.

OPTIONS AND ACCESSORIES (cont)

UNIT-MOUNTED DISCONNECT (Sizes 036-150)

CONVENIENCE OUTLET

UNIT-MOUNTED DISCONNECT (Sizes 150-300)

Factory-installed, internally mounted and externally accessible 115-v female receptacle. Includes 15-amp GFI (Ground Fault Interrupter) receptacle with independent fuse protection. Voltage required to operate convenience outlet is provided by a fieldinstalled transformer.

Factory-installed, internally-mounted, NEC (National Electrical Code) and UL (Underwriters’ Laboratories) approved non-fused switch provides unit power shutoff with disconnect lockout protection capability. The control box access door is interlocked with the non-fused disconnect. The non-fused disconnect must be in the OFF position to open this door. The switch is accessible from outside the unit.

OPTIONS AND ACCESSORIES (cont)

HAIL GUARD COIL GUARD GRILLE (036-150 Only)

Condenser coil hail guard accessory (field installed) protects coils against damage from hail and other flying debris.

CONTROL BOX HINGED PANEL OPTION*,

581B036-072 UNITS

COMPRESSOR HINGED PANEL OPTION*,

581B090-150 UNITS SHOWN

Coil guard grille protects coils against large objects and vandalism.

CONTROL BOX HINGED PANEL OPTION*,

581B090-150 UNITS SHOWN

COMPRESSOR HINGED PANEL OPTION*,

581B036-072 UNITS SHOWN

*Hinged access panels not available on 580F models.

OPTIONS AND ACCESSORIES (cont)

EVAPORATOR-FAN HINGED PANEL OPTION*

581B036-072

This is included as a factory-installed option. It permits quick and simple evaporator-fan access.

FILTER HINGED PANEL OPTION*

This is included as a factory-installed option. It permits tool-less filter access.

*Hinged panels not available on 580F models.

LP CONVERSION KIT

BURNER SPUDS (ORIFICES)

LP conversion kit allows the unit to utilize a liquid propane fuel supply in areas where natural gas is not available. (Kit shown is for sizes 036-072.)

CONTROLS

OPERATING SEQUENCE — SIZE 036-073 UNITS Cooling, Units Without Economizer —

calls for cooling, terminals G and Y1 are energized. The indoor (evaporator) fan contactor (IFC), and compressor contactor no. 1 (C1) are energized and the indoor (evaporator) fan motor (IFM), compressor no. 1, and condenser fan start. The outdoor (condenser) fan motor (OFM) runs continuously while unit is cooling.

Cooling, Units With EconoMi$er —

temperature (OAT) is above the ECON SP set point and the room thermostat calls for Stage 1 cooling (R to G + Y1), the indoor (evaporator) fan motor (IFM) is energized and the EconoMi$er damper modulates to minimum position. The compressor contactor is energized to start the compressor and outdoor (condenser) fan motor (OFM). After the thermostat is satisfied, the damper modulates to the fully closed position when the IFM is deenergized.

When the OAT is below the ECON SP setting and the room thermostat calls for Stage 1 cooling (R to G + Y1), the EconoMi$er modulates to the minimum position when the IFM is energized. The EconoMi$er provides Stage 1 of cooling by modulating the return and outdoor air dampers to maintain a 55 F supply air set point. If the supply-air temperature (SAT) is greater than 57 F, the EconoMi$er modulates open, allowing a greater amount of outdoor air to enter the unit. If the SAT drops below 53 F, the outdoor air damper modulates closed to reduce the amount of outdoor air. When the SAT is between 53 and 57 F, the EconoMi$er maintains its position.

If outdoor air alone cannot satisfy the cooling requirements of the conditioned space, and the OAT is above the MECH CLG LOCKOUT set point, the EconoMi$er integrates free cooling with mechanical cooling. This is accomplished by the strategies below.

Compressor has a 2-minute Minimum On, Minimum Off,

NOTE:

and Interstage delay timer.

1. If Y1 is energized, and the room thermostat calls for Y2 (2-stage thermostat), the compressor and OFM are energized. The position of the EconoMi$er damper is maintained at its current value.

2. If Y1 is energized for more than 20 minutes, and Y2 is not energized (whether or not a 2-stage thermostat is used), the compressor and OFM are energized. The position of the EconoMi$er damper is maintained at its current value.

3. If Y1 is energized, and the compressor is already energized (see Step 2) and the room thermostat calls for Y2, the compressor continues to operate.

4. If the compressor is energized and the thermostat is satisfied, the compressor, the OFM, and IFM are deenergized and the EconoMi$er modulates closed.

When the OAT is below the MECH CLG LOCKOUT set point, the compressors remain off.

Heating, Units Without Economizer —

through W1, indoor (evaporator) fan contactor (IFC) and heater contactor no. 1 (HC1) are energized. On units equipped for 2 stages of heat, when additional heat is needed, heater contactor no. 2 is energized through W2.

Heating, Units With Economizer —

ture calls for heat through terminal W1, the indoor (evaporator) fan contactor (IFC) and heater contactor no. 1 (HC1) are energized. On units equipped for 2 stages of heat, when additional heat is needed, heater contactor no. 2 is energized through W2. The economizer damper moves to the minimum position. When the thermostat is satisfied, the damper moves to the fully closed position.

When the thermostat

When the outdoor-air

Upon a call for heating

When the room tempera-

OPERATING SEQUENCE — SIZE 090-150 UNITS Cooling, Units Without Economizer —

calls for cooling, terminals G and Y1 are energized. The indoor (evaporator) fan contactor (IFC), compressor contactor no. 1 (C1) and outdoor fan contactor (OFC) are energized and the indoor (evaporator) fan motor (IFM), compressor no. 1, and condenser fans start. The outdoor (condenser) fan motors (OFM) run continuously while unit is cooling. If the thermostat calls for a second stage of cooling by energizing Y2, compressor contactor no. 2 (C2) is energized and compressor no. 2 starts.

Cooling, Units With EconoMi$er —

Compressor has a two-minute Minimum On, Minimum

NOTE:

Off, and Interstage delay timer.

1. If Y1 is energized, and the room thermostat calls for Y2 (2-stage thermostat), compressor no. 1 and OFM are energized. The position of the EconoMi$er damper is maintained at its current value.

2. If Y1 is energized for more than 20 minutes, and Y2 is not energized (whether or not a 2-stage thermostat is used), compressor no. 1 and OFM are energized. The position of the EconoMi$er damper is maintained at its current value.

3. If Y1 is energized, and compressor no. 1 is already energized (see Step 2) and the room thermostat calls for Y2, the compressor continues to operate. If Y2 remains energized for more than 20 minutes, compressor no. 2 is energized.

Compressor no. 2 cannot be energized unless there is a

NOTE:

signal for Y2 from the space thermostat.

4. If compressor no. 2 is energized, and the Y2 signal from the thermostat is satisfied, compressors 1 and 2 are deenergized. Reasserting Y2 will start compressor no. 1 and (after a 20-minute interstage delay) compressor no. 2.

5. If compressor no. 1 is energized and the thermostat is satisfied, compressor no. 1, the OFM, and IFM are deenergized and the EconoMi$er modulates closed.

When the OAT is below the MECH CLG LOCKOUT set point, the compressors remain off.

When the thermostat

When the outdoor-air

CONTROLS (cont)

Heating, Units Without Economizer —

through terminal W1, indoor (evaporator) fan contactor (IFC) and heater contactor no. 1 (HC1) are energized. On units equipped for 2 stages of heat, when additional heat is needed, HC2 is energized through W2.

Heating, Units With Economizer —

stat calls for heat through terminal W1, the indoor (evaporator) fan contactor (IFC) and heater contactor no. 1 (HC1) are energized. On units equipped for 2 stages of heat, when additional heat is needed, HC2 is energized through W2. The economizer damper moves to the minimum position. When the thermostat is satisfied, the damper moves to the fully closed position.

SEQUENCE OF OPERATION SIZES 155-300 Cooling, Units Without EconoMi$er —

for cooling, terminals G and Y1 are energized. The indoor (evaporator) fan contactor (IFC) and compressor contactor no. 1 (C1) are energized and evaporator-fan motor, compressor no. 1, and condenser fans start. The condenser-fan motors run continuously while unit is cooling. If the thermostat calls for a second stage of cooling by energizing Y2, compressor contactor no. 2 (C2) is energized and compressor no. 2 starts.

Heating, Units Without EconoMi$er (If Accessory Heater is Installed) —

and heater contactor no. 1 (HC1) are energized. On units equipped for 2 stages of heat, when additional heat is needed, HC2 is energized through W2.

Cooling, Units With EconoMi$er —

the ECON SP set point and the room thermostat calls for Stage 1 cooling (R to G + Y1), the indoor-fan motors (IFM) are energized and the EconoMi$er damper modulates to minimum position. The compressor contactor and OFC are energized to start the compressor and outdoor-fan motor (OFM). After the thermostat is satisfied, the damper modulates to the fully closed position when the IFM is deenergized.

When the OAT is below the ECON SP setting and the room thermostat calls for Stage 1 cooling (R to G + Y1), the EconoMi$er modulates to the minimum position when the IFM is energized. The EconoMi$er provides Stage 1 of cooling by modulating the return and outdoor-air dampers to maintain a 55 F supply-air set point. If the supply-air temperature (SAT) is greater than 57 F, the EconoMi$er modulates open, allowing a greater amount of outdoor air to enter the unit. If the SAT drops below 53 F, the outdoor-air damper modulates closed to reduce the amount of outdoor air. When the SAT is between 53 and 57 F, the EconoMi$er maintains its position.

NOTE:

mum Off.

1. If Y1 is energized, and the room thermostat calls for Y2 (2-stage thermostat), the compressor and OFC are energized. The position of the EconoMi$er damper is maintained at its current value.

2. If Y1 is energized for more than 20 minutes, and Y2 is not energized (whether or not a 2-stage thermostat is used), the compressor and OFC are energized. The position of the EconoMi$er damper is maintained at its current value.

3. If Y1 is energized, and compressor no. 1 is already energized (see Step 2) and the room thermostat calls for Y2,

Upon a call for heating through terminal W1, IFC

Compressors have a two-minute Minimum On and Mini-

Upon a call for heating

When the room thermo-

When thermostat calls

When the OAT is above

compressor no. 1 continues to operate. If Y2 remains energized for more than 20 minutes, compressor no. 2 is energized.

Compressor no. 2 cannot be energized unless there is a

NOTE:

signal for Y2 from the space thermostat.

4. If compressor no. 2 is energized, and the Y2 signal from the thermostat is satisfied, compressors 1 and 2 are deenergized. Re-asserting Y2 will start compressor no. 1 and (after a 20-minute interstage delay) compressor no. 2.

5. If compressor no. 1 is energized and the thermostat is satisfied, compressor no. 1, the OFM, and IFM are deenergized and the EconoMi$er modulates closed.

When the OAT is below the MECH CLG LOCKOUT set point, the compressors remain off.

Freeze Protection Thermostat(s) —

mostat (FPT) is located on the top and bottom of the evaporator coil. It detects frost build-up and turns off the compressor, allowing the coil to clear. Once frost has melted, the compressor can be reenergized by resetting the compressor lockout.

Heating, Units With EconoMi$er (If Accessory Heater is Installed) —

ing controls are energized as described in the Heating, Units Without EconoMi$er section. The IFM is energized and the EconoMi$er damper modulates to the minimum position. When the thermostat is satisfied, the damper modulates closed.

Units With Perfect Humidity™ Dehumidification Package —

When thermostat calls for cooling, terminals G and Y1 and/or Y2 and the compressor contactor C1 and/or C2 are energized. The indoor (evaporator) fan motor (IFM), compressors, and outdoor (condenser) fan motors (OFM) start. The OFMs run continuously while the unit is in cooling. As shipped from the factory, both Perfect Humidity dehumidification circuits are always energized.

If Perfect Humidity circuit modulation is desired, a field-installed, wall-mounted light-commercial thermidistat (with field-supplied relay) is required. If the thermidistat is installed and calls for the Perfect Humidity subcooler coil to operate, the relay switch closes. This energizes the 3-way liquid line solenoid valve coils (LLSV1 for circuit 1 and LLSV2 for circuit 2) of the Perfect Humidity circuits, forcing the warm liquid refrigerant of the liquid line to enter the subcooler coils.

As the warm liquid passes through the subcooler coils, it is exposed to the cold supply airflow coming off the evaporator coils and the liquid is further cooled to a temperature approaching the evaporator coil leaving-air temperature. The state of the refrigerant leaving the subcooler coils is a highly subcooled liquid refrigerant. The liquid then enters a thermostatic expansion valve (TXV) where the liquid is dropped to the evaporator pressure. The TXVs can throttle the pressure drop of the liquid refrigerant and maintain proper conditions at the compressor suction valves over a wide range of operating conditions. The liquid proceeds to the evaporator coils at a temperature lower than normal cooling operation. This lower temperature is what increases the latent and sensible capacity of the evaporator coils.

The 2-phase refrigerant passes through the evaporators and is changed into a vapor. The air passing over the evaporator coils will become colder than during normal operation as a result of the colder refrigerant temperatures. However, as it passes over the subcooler coils, the air will be warmed, decreasing the sensible capacity and reducing the sensible heat of the rooftop unit.

When the room thermostat calls for heat, the heat-

A freeze protection ther-

CONTROLS (cont)

As the refrigerant leaves the evaporator, the refrigerant passes a subcooler control low-pressure switch (S-LPS1 for circuit 1 or S-LPS2 for circuit 2) in the suction line. This low-pressure switch will deactivate the Perfect Humidity™ package when the suction pressure reaches 60 psig. The subcooler control lowpressure switch is an added safety device to protect against evaporator coil freeze-up during low ambient operation. The subcooler control low-pressure will only deactivate the 3-way liquid line solenoid valve in the Perfect Humidity circuit. The compressors will continue to run as long as there is a call for cooling, regardless of the position of the subcooler control lowpressure switch. The 3-way solenoid valve and the Perfect Humidity package will be reactivated only when the call for cooling has been satisfied, the subcooler control low-pressure switch has closed above 80 psig, and a new call for cooling exists. The crankcase heaters on the scroll compressors provide additional protection for the compressors due to the additional refrigerant charge in the subcooler.

When the thermidistat is satisfied, the relay internal switch opens, cutting power to and deenergizing the LLSVs. The refrigerant is routed back through the evaporators and the subcooler coils are removed from the refrigerant loops. When the thermostat is satisfied, C1 and C2 are deenergized and the compressors, IFM, and OFMs shut off. If the thermostat fan selector switch is in the ON position, the IFM will run continuously.

Perfect Humidity™ Dehumidification Option

TYPICAL WIRING SCHEMATIC (Single Fan Units, Sizes 036-073)

TYPICAL WIRING SCHEMATIC (Two-Fan Units, Size 090-150)

ACTUATOR

50DK509044

WHT/GRY

BLK/GRY

3-PIN

MOLEX

BRN

CONNECTOR CABLE

NOT USED

WHT/YEL BLK/YEL

24VAC

RED

24COM

BRN

GND

GRN

CL01

GRY

CL02

ORN

DRIVE

STEPPER

BLU

YEL

BLK

COM

AD-DME1711-1

50DK508232

EconoMi$er

CONFIG

10º

STATUS

OAT

TAN

COM

VIO

OAH

WHT

+15V

RED

RAT

TAN

COM

MIN

POS (X)

CO2 (COM)

ECON

LOCKOUT

MECH CLG

(PPM)

CO SP

RAM

+15V

CO2 +

DAT

COM

REM POT

COM

LED

COM

VIO

WHT

RED

VIO

PNK

100

30º

20º

40º

50º

OFF

1000

1200

800

1400

FIELD INSTALLED OPTION

OAT

RAT

USED FORMOUTDOOR

AIR ENTHALPY

VIO WHT RED

CONNECTOR

RED

BLU

BLK

BRN

GRY

VIO

PNK

YEL

ORN

12-PIN

FEMALE

MOLEX

PL6

50DK508234

TYPICAL WIRING SCHEMATIC (Sizes 155-300)

AHA — AWG — BRK W/AT — C— CAP — CB — CC — CH — CLO — COMP — CR — CT — DAT — DM — DU — EC — EQUIP — ER — EPS —

FL — FLA — FPT —

Adjustable Heat Anticipator American Wire Gage Breaks with Amp Turns Contactor, Compressor Capacitor Circuit Breaker Cooling Compensator Crankcase Heater Compressor Lockout Compressor Motor Control Relay Current Transformer Discharge Air Thermistor Damper Motor Dummy Terminal Enthalpy Control Equipment EconoMi$er Relay Emergency Power Supply (9 volt) Fuse Link Full Load Amps Freeze Protection Thermostat

TYPICAL WIRING SCHEMATIC (Sizes 155-300)

LEGEND

FSS — FU — GND — HC — HPS — HTR — IFC — IFCB — IFM — IFR — L— LOR — LPS — LS — LSM — OAT — OFC — OFM — OP — PL — PRI — QT — SAT —

Filter Status Switch Fuse Ground Heater Contactor High-Pressure Switch Heater Indoor-Fan Contactor Indoor-Fan Circuit Breaker Indoor-Fan Motor Indoor-Fan Relay Light Lockout Relay Low-Pressure Switch Limit Switch Limit Switch (Manual Reset) Outdoor-Air Thermostat Outdoor-Fan Contactor Outdoor-Fan Motor Overcurrent Protection Plug Assembly Primary Quadruple Terminal Supply Air Thermostat

SW — TB — TC — TH — TRAN —

Switch Terminal Block Thermostat Cooling Thermostat Heating Transformer

Terminal (Marked)

Terminal (Unmarked)

Terminal Block

Splice

Factory Wiring Field Wiring Option/Accessory Wiring To indicate common potential

only; not to represent wiring.

NOTES:

1. Compressor and/or fan motor(s) thermally protected; 3-phase motors protected against primary single-phasing conditions.

2. If any of the original wire furnished must be replaced, it must be replaced with type 90° C wire or its equivalent.

3. Jumpers are omitted when unit is equipped with EconoMi$er.

5. IFCB must trip amps is equal to or less than 140% FLA.

6. The CLO locks out the compressor to prevent short cycling on compressor overload and safety devices. Before replacing CLO, check these devices.

7. Number(s) indicates the line location of used contacts. A bracket over (2) numbers signifies a single-pole, double-throw contact. An underlined number signifies a normally closed contact. Plain (no line) number signifies a normally open contact.

TYPICAL WIRING SCHEMATIC (cont)

OAT —

LEGEND

Outdoor-Air Thermostat

EconoMi$er Wiring

NOTES:

1. If the Non-Fused Disconnect Option is ordered, the Non-Fused Disconnect will be factory-installed.

2. The Disconnect takes the place of TB-1 as shown on the unit wiring diagram label and the component arrangement label.

Non-Fused Disconnect (Optional)

TYPICAL PIPING AND WIRING — SIZES 036-150

Vertical Discharge Ducting

LEGEND

National Electrical Code

NEC —

*Factory-supplied, internally mounted disconnect

available as an option.

Horizontal Discharge Ducting

TYPICAL PIPING AND WIRING — SIZES 155-300

LEGEND

NEC —

NOTES:

1. Illustration shown is a general guide only and is not intended to include all details for any specific installation.

2. Installation must comply with all applicable codes.

3. A 90-degree elbow

National Electrical Code

be installed on the supply duct connection for units equipped with electric heat.

must

6'-2 3/8'' MAX.

5'-9 3/16'' MAX.

5 3/16''

BAFFLE

24'' MIN.

1'-0 3/16''

1'-7 15/16''

4'-6 13/16''

1'-0 3/16''

1'-10 11/16'' MAX.

CONDENSATE DRAIN PAN —

A sloped condensate drain pan is supplied on all units. The condensate drain pan must be externally trapped. Condensate drains are located on both the bottom and end of the unit. The bottom drain can be used for thru-the-curb connections.

DUCTWORK —

All ductwork must be attached to flanges. If no flanges are present, they must be field supplied. Secure vertical discharge ductwork to roof curb. For horizontal discharge applications, attach ductwork to flanges. Fieldsupplied flanges can be attached to horizontal discharge openings and all ductwork attached to flanges.

THRU-THE-BOTTOM SERVICE CONNECTIONS —

the-bottom connections allow field power wires and control wires to enter through the basepan.

THERMOSTAT —

Use of 2-stage cooling thermostat is

recommended for all units equipped with economizer.

HEATING-TO-COOLING CHANGEOVER —

All units are automatic changeover from heating to cooling when automatic changeover thermostat and subbase are used.

AIRFLOW —

Units are draw-thru on cooling and blow-thru

on heating.

MAXIMUM AIRFLOW —

To minimize possibility of condensate blow-off from evaporator, airflow through units should not exceed 500 cfm/ton.

MINIMUM AIRFLOW —

Minimum airflow for cooling is

300 cfm/ton for unit sizes 036-240, 280 cfm/ton for size 300.

MINIMUM AMBIENT OPERATING TEMPERATURE —

Minimum operating temperature for standard 036-150 units is 25 F, for standard 155-300 units is 40 F. With accessory Motormaster® or Motormaster IV control, units can operate at outdoor temperatures down to –20 F.

10.

MAXIMUM OPERATING OUTDOOR-AIR TEMPERATURE

Maximum outdoor-air operating temperature for cooling

—

is 125 F (115 F for 558F036-150 units).

APPLICATION DATA

11.

MOTOR DATA —

thru over the motor), air path, and specially designed motors, the full horsepower (maximum continuous bhp) listed in the Physical Data table and in each Fan Performance table can be utilized with extreme confidence.

Using Bryant motors to the values listed in the Physical Data, Fan Performance, and Evaporator-Fan Motor Data tables failure. In addition, the unit warranty will not be affected.

12.

PERFECT HUMIDITY™ DEHUMIDIFICATION PACKAGE

Thru-

—

subcooling the hot liquid refrigerant leaving the condenser coil. The Perfect Humidity package consists of a subcooling coil located on the leaving-air side of the evaporator coil. The location of the coil in the indoor airstream enhances the latent capacity of the rooftop units by up to 40%.

Many buildings suffer damage or have poor indoor-air quality due to overly humid conditions. Building humidity must be controlled for the following reasons:

Due to Bryant’s internal unit design (draw-

result in nuisance tripping or premature motor

will not

This option provides greater dehumidification by further

INDOOR-AIR QUALITY —

Humidity is a major factor in the growth and propagation of mold and mildew in a building. The mold and mildew can spread quickly and grow in carpets and ductwork and on walls, and often causes cases of sick building syndrome. This syndrome can lead to employee absenteeism due to illness, lower worker productivity, and increased health care costs. The American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) recommends that relative humidity levels in buildings be maintained below 70%.

COMFORT LEVELS —

High humidity levels cause the occupied space to become uncomfortable, because humidity interferes with the body’s natural cooling pro- cess (evaporation at the skin surface).

NOTE:

1. Do not drill in this area, damage to basepan may result in water leak.

2. A 90-degree elbow must be provided in the supply ductwork to comply with UL (Underwriters’ Laboratories) codes for use with electric heat.

Concentric Duct Distribution —

Unit Sizes 155-300

Shaded area indicates block-off panels.

Dimensions A, A′ and B, B′ are obtained from field-supplied

NOTE:

ceiling diffuser.

CAUTION:

without electric heat. Personal injury or unit damage may result.

Concentric ducts may only be installed on units

Concentric Duct Details — Unit Sizes 155-300

APPLICATION DATA (cont)

HUMIDITY DAMAGE —

damage, such as stained wallpaper and ceiling tiles. Humidity can also damage books and artwork, and create strong odors in carpets. In addition, humidity can contribute to unacceptable product quality in industrial processes.

IMPROPER VENTILATION —

humid geographical areas cannot be properly ventilated due to high humidity levels outdoors, resulting in poor indoor-air quality.

EQUIPMENT INEFFICIENCY —

inefficient operation of refrigerators and freezers.

INCREASED ENERGY COSTS —

humidity levels and less comfortable conditions, thermostat set points are lowered to force the HVAC (heating, ventilation, and air conditioning) equipment to run longer and work harder to lower the humidity levels. Also, in an attempt to control humidity, system designers typically oversize HVAC equipment and add reheat capability to get the desired latent capacity. This results in higher initial equipment costs, as well as increased energy expenses throughout the life of the unit.

Applications

There are many different rooftop unit applications that are susceptible to problems caused by high humidity levels. Some common applications include:

RESTAURANTS —

have many humidity-producing activities, such as dish washing and cooking.

SUPERMARKETS —

ciency in operation of refrigeration and freezer systems.

MUSEUMS AND LIBRARIES —

books and artwork.

GYMNASIUMS, LOCKER ROOMS, AND HEALTH CLUBS —

uncomfortable occupied space conditions.

HOT AND HUMID CLIMATES —

United States is a good example of this application. The Perfect Humidity dehumidification package becomes particularly useful when increased amounts of the hot and humid outdoor air need to be brought into the building for proper ventilation.

13.

PERFECT HUMIDITY DEHUMIDIFICATION PACKAGE DESIGN EFFECTS —

the Perfect Humidity dehumidification package, refer to the pressure enthalpy curve, and analyze the Perfect Humidity package effects on the refrigerant in the rooftop unit. The pressure enthalpy curve shows the refrigerant cycle for a

rooftop unit. Standard Unit Refrigerant Cycle At point no. 1 in the pressure enthalpy curve, vapor leaving the

compressor at a high pressure and a high temperature enters the condenser. The condenser removes heat from the refrigerant, lowers its temperature, and changes it to a liquid. At point no. 2, the liquid leaves the condenser and enters a fixed expansion device that lowers the pressure of the refrigerant. At point no. 3, the liquid enters the evaporator coil, where the refrigerant increases in temperature and changes back to a vapor. At point no. 4, the vapor leaves the evaporator and reenters the compressor.

Shower areas and human perspiration cause

Humidity causes property

Buildings in hot and

Humidity can cause

Because of high

The kitchen areas of restaurants

High humidity levels cause ineffi-

Humidity can damage

The southeastern

To fully understand the operation of

Refrigerant Cycle Using Perfect Humidity™ Dehumidification Package

When a subcooler coil is added to the rooftop unit, the refrigerant is affected in such a way that the unit latent capacity is increased. The refrigerant cycle follows the same path from point no. 1 to point no. 2 as the standard refrigerant cycle without a subcooler (see the pressure enthalpy curve). However, at point no. 2, the liquid refrigerant enters the subcooler coil where the temperature is lowered further. At point no. 2A, this subcooled liquid enters the TXV, which drops the pressure of the liquid. At point no. 2B, the liquid enters the fixed orifice metering device. The refrigerant leaves this device as a saturated vapor and enters the evaporator at point no. 2C. The improved refrigeration effect can now be seen between point no. 2C and point no. 3. The increase in the total refrigeration effect is the additional enthalpy gained from point no. 2C to point no. 3. However, the subcooler coil rejects this added refrigeration effect to the air downstream of the evaporator coil, thus maximizing the overall latent effect. This improved latent effect is a direct result of the addition of the Perfect Humidity subcooler coil to the refrigerant cycle.

Latent Capacity Effects Refer to the psychrometric chart to see how the sensible heat

factor decreases when the optional Perfect Humidity dehumidification package is installed. This chart contains data for the 5-ton unit operation, both with and without the Perfect Humidity package, at 1750 cfm. Point no. 1 on the chart represents the return-air dry bulb (80 F) and wet bulb (67 F) conditions. Point no. 2 represents the supply-air conditions for a standard rooftop unit without the Perfect Humidity dehumidification package. Point no. 3 represents the supply-air conditions for a rooftop unit with the Perfect Humidity package. By connecting point no. 1 and point no. 2 on the chart and finding the intersection on the sensible heat factor scale, the sensible heat factor is 0.73. Connect point no. 1 and point no. 3, and see that the sensible heat factor is 0.58. This is a 17.5% increase in latent capacity for the given conditions. This increase in latent capacity allows the rooftop units to remove more moisture from the conditioned space; thus lowering the humidity levels.

Dehumidification Effects Further evidence of dehumidification can be seen by analyzing

the pounds of water per pound of dry air found in the supply air. At point no. 2 in the psychrometric chart, there are 65 grains (0.0092 lb) of moisture per pound of dry air. At point no. 3, there are 58 grains (0.0083 lb) of moisture per pound of dry air. This is a 12.1% decrease in the amount of water in the supply air.

14.

PERFECT HUMIDITY DEHUMIDIFICATION PACKAGE OPERATING PERFORMANCE —

midification package operation does not affect the electrical data. The electrical data remains the same either with or without the Perfect Humidity package.

The operating and shipping weights will be slightly increased with the addition of the Perfect Humidity subcooler. See the Physical Data table for added base unit weight with this option.

Refer to cooling performance data, both with and without the Perfect Humidity dehumidification package. Note the greatly improved latent capacity with the Perfect Humidity dehumidification package.

Static pressure is also slightly affected by the addition of the Perfect Humidity dehumidification package. See Static Pressure Drop table on page 94 when using this option.

Perfect Humidity dehu-

APPLICATION DATA (cont)

15. PERFECT HUMIDITY DEHUMIDIFICATION PACKAGE FEATURES AND BENEFITS

• The Perfect Humidity dehumidification package can improve

the humidity control of your rooftop equipment by up to 40%. This greatly reduces the risk of sick building syndrome by reducing biological growth in both ductwork and the rest of the building.

• The Perfect Humidity dehumidification package improves

comfort levels in the building by better controlling the humidity. This improved comfort level allows building tenants to raise the cooling set point on the thermostats for accumulated energy savings.

• Better humidity control lowers the risk of humidity-induced

property damage.

• The Perfect Humidity dehumidification package permits build-

ing refrigerators and freezers to operate more efficiently due to lower relative humidity levels. This is the perfect solution for supermarket applications.

• The Perfect Humidity subcooling circuit can be operated by a

humidity sensor. If the sensor is used, the Perfect Humidity circuit will then only operate when needed. If the humidity levels in the occupied space are acceptable (such as in the spring and fall seasons), the Perfect Humidity circuit will not operate. The rooftop unit is then able to operate to its full sensible potential, which provides more efficient performance and energy savings.

• At lower outdoor temperatures, rooftop units with dehumidifi-

cation devices are subject to low suction pressure conditions. The Perfect Humidity dehumidification package contains a low-pressure switch that deactivates the Perfect Humidity dehumidification package under low suction pressure conditions without deactivating the compressors.

• Improved humidity control allows increased outdoor-air ventilation in hot and humid geographical areas. Humidity control also helps to improve the indoor-air quality of the building.

• The Perfect Humidity dehumidification package is factory installed. There are no additional field installation costs. There is also no need to purchase a roof curb from another manufacturer, as standard Bryant roof curbs will accommodate the rooftop units which have the Perfect Humidity dehumidification package option installed.

• The Perfect Humidity dehumidification package is engineered and manufactured by Bryant for Bryant rooftop units. All application support, service, and warranty issues can therefore be handled through one company.

• The slightly lower sensible capacities obtained when using the Perfect Humidity dehumidification package allow the unit to operate for an extended period of time. The more the unit operates, the more air is exposed to the subcooling coil. This rooftop unit increased latent capacity results in lower relative humidity levels in the occupied space.

• It is no longer necessary to oversize equipment and add reheat devices to properly dehumidify your building. In a typical scenario, a building owner may need 39,000 Btuh of sensible capacity and 23,000 Btuh of latent capacity (62,000 total Btuh). To accomplish this without the Perfect Humidity dehumidification package, a 7

/2-ton unit with a reheat device would be necessary to attain the higher latent capacity required. This results in a large up-front expense to oversize the equipment from a standard 5-ton to a 7

/2-ton unit.

The building owner can now purchase a 5-ton unit with the Perfect Humidity dehumidification package for a small additional up-front charge, and no reheat device will be necessary to satisfy the cooling requirements. This reduces both installation costs and operating costs throughout the life of the product.

APPLICATION DATA (cont)

Pressure Enthalpy Curve

Numbers 1 through 4 indicate point numbers referred to in Perfect Humidity™ Dehumidification Package Design Effects section.

NOTE:

APPLICATION DATA (cont)

Entering Air (F) 80 db/67 wb

Point 1 —

Leaving Air (F) 58.9 db/56.4 wb

(Without Subcooler)

Point 2 —

Leaving Air (F) 63.0 db/56.8 wb

(With Subcooler)

Point 3 —

Psychrometric Chart (551B072 Shown)

Dry Bulb

Wet Bulb

LEGEND

db —

wb—

MODEL NUMBER NOMENCLATURE — 558F

558F E X 090 000 KB

558F – Packaged Rooftop

Standard Efficiency Electric Cooling Unit

558F036-150 0TFQ004-012

Voltage Designation J – 208/230-1-60 P – 208/230-3-60 E – 460-3-60 T – 575-3-60

X – No Heat Installed

(Field-installed electric heaters available)

Nominal Tons 036 – 3 048 – 4 060 – 5 072 – 6 073 – 6*

091 – 7 1/2* 102 – 8 1/2 120 – 10 121 – 10* 150 – 12 1/2

090 – 7 1/2

*558F073,091,121 units are rated as mid-efficiency units.

The example model number 558FEX090000KB designates a 7

NOTE:

with EconoMi$er and alternate drive.

UNIT

558F

036 048 060

NOMINAL

TONS

STANDARD

CFM

3 1200 35,000 4.0 10.0 9.7 81 4 1600 47,000 5.5 10.0 9.7 81 5 2000 57,000 6.7 10.0 9.7 81

/2 ton 460-3-60 volt electric cooling rooftop unit

ARI* CAPACITY RATINGS

NET COOLING

CAPACITY

(Btuh)

TOTAL

Factory-Installed

Option Codes

Electric Heaters 000 – No factory-installed electric he

SEER† SOUND

Belt Drive Direct Drive

RATING

(dB)

UNIT 558F

072** 073 090**

091 102** 120** 121 150**

NOMINAL

TONS

STANDARD

CFM

6 2100 72,000 8.0 9.0 81 †† 6 2400 71,000 6.9 10.3 81 N/A

2800 85,000 9.6 8.9 87 9.40 3000 89,000 8.4 10.3 87 10.6

3000 98,000 11.0 9.0 87 9.00 10 4000 117,000 13.0 9.0 88 9.40 10 4000 115,000 11.1 10.3 88 10.6

4500 144,000 15.8 9.2 87 9.20

NET COOLING

CAPACITY

(Btuh)

LEGEND

dB — db — EER — IPLV — SEER — wb —

*Air Conditioning and Refrigeration Institute.

†Applies only to units with capacity of 65,000 Btuh or less.

Sound Levels (decibels) dry bulb Energy Efficiency Ratio Integrated Part-Load Values Seasonal Energy Efficiency Ratio wet bulb

**Not ASHRAE 90.1 compliant.

††The IPLV applies only to 2-stage cooling units.

NOTES:

1. Rated in accordance with ARI Standards 210/240-94 (036-121) or 340/360-93 (150) and 270-95.

2. Ratings are net values, reflecting the effects of circulating fan heat.

TOTAL

3. Ratings are based on:

Cooling Standard:

ture and 95 F db air entering outdoor unit.

IPLV Standard:

and 80 F db outdoor entering-air temperature.

4 All 558036-060, 073, 091, 121 units are in compliance with ASHRAE

EER

80 F db, 67 F wb indoor entering-air tempera-

80 F db, 67 F wb indoor entering-air temperature

SOUND RATING

(dB)

IPLV

90.1-1999 Energy Standard for minimum SEER and EER requirements. Refer to state and local codes or visit the following website: http://solstice.crest.org/efficiency/bcap

to determine if compliance with this standard pertains to a given geographical area of the United States.

California, Maryland, Washington, Wyoming, Massachusetts and various local and state building codes adopted the ASHRAE 90.1-99 efficiency standard on October 29, 2001.

PHYSICAL DATA — 558F036-073

UNIT SIZE 558F 036 048 060 072 073 NOMINAL CAPACITY (tons)

OPERATING WEIGHT (lb)

Unit

Al/Al* Al/Cu* Cu/Cu* EconoMi$er

Roof Curb†

COMPRESSOR

Quantity No. Cylinders (per circuit) Oil (oz)

REFRIGERANT TYPE

Operating Charge (lb-oz)

Circuit 1 Circuit 2

CONDENSER COIL

Rows...Fins/in. Total Face Area (sq ft)

CONDENSER FAN

Nominal Cfm Quantity...Diameter (in.) Motor Hp...Rpm Watts Input (Total)

EVAPORATOR COIL

Expansion Device Rows...Fins/in. Total Face Area (sq ft)

EVAPORATOR FAN

Quantity...Size (in.) Std

Type Drive Std

Nominal Cfm Maximum Continuous Bhp Std

Motor Frame Size Std

Nominal Rpm High/Low Std

Fan Rpm Range Std

Motor Bearing Type Maximum Allowable Rpm Motor Pulley Pitch Diameter Min/Max (in.) Std

Nominal Motor Shaft Diameter (in.) Std

Fan Pulley Pitch Diameter (in.) Std

Belt, Quantity...Type...Length (in.) Std

Pulley Center Line Distance (in.) Std

Speed Change per Full Turn of

Movable Pulley Flange (rpm) Std

Movable Pulley Maximum Full Turns

From Closed Position Std

Factory Setting Std

Factory Speed Setting (rpm) Std

Fan Shaft Diameter at Pulley (in.)

HIGH-PRESSURE SWITCH (psig)

Standard Compressor Internal Relief (Differential) Cutout Reset (Auto.)

LOW-PRESSURE SWITCH (psig)

Cutout Reset (Auto.)

FREEZE-PROTECTION THERMOSTAT (F)

Opens Closes

Alt High-Static

Alt

High-Static

Alt High-Static

OUTDOOR-AIR INLET SCREENS

Quantity...Size (in.)

RETURN-AIR FILTERS

Quantity...Size (in.)

LEGEND

Aluminum

Al —

Brake Horsepower

Bhp —

Copper

Cu —

*Evaporator coil fin material/condenser coil fin material. Contact your local representative for

details about coated fins.

†Weight of 14-in. roof curb.

**Single phase/three phase.

The 558F036-150 units have a loss-of-charge switch located in the liquid line..

NOTE:

34566

365 375 395 470 520 370 381 402 479 530 373 387 410 490 540

47 47 47 47 47

115 115 115 115 115

Reciprocating

11111 22222

50 50 50 54 54

Reciprocating Reciprocating Scroll Scroll

R-22

4-4 6-6 6-14 9-0 5-0

—————

1...17 2...17 2...17 2...17 2...17

8.36 8.36 10.42 10.42 10.42

3500 4000 4000 4000 4000

1...22.0 1...22.0 1...22.0 1...22.0 2...22

/4...1100

325 325 325 325 325

2...15 2...15 3...15 4...15 4...15

4.17 5.5 5.5 5.5 5.5

1...10 x 10 1...10 x 10 1...11 x 10 1...10 x 10 1...11 x 10

1...10 x 10 1...10 x 10 1...10 x 10 — 1...10 x 10

1...10 x 10 1...10 x 10 1...10 x 10 1...10 x 10 1...10 x 10 Direct Direct Direct Belt D irect

Belt Belt Belt — Belt Belt Belt Belt Belt Belt

1200 1600 2000 2400 2000

.34 .75 1.20 2.40 1.20

1.00 1.00 1.30/2.40** — 1.30/2.40**

2.40 2.40 2.90 2.90 2.90 48 48 48 56 48 48 48 56 — 56 56 56 56 56 56

860/800 1075/970 1075/970 — 1075/970

1620 1620 1725 — 1725 1725 1725 1725 1725 1725

———1070-1460 —

760-1000 835-1185 900-1300 — 1070-1460

1075-1455 1075-1455 1300-1685 1300-1685 1300-1685

Ball Ball Ball Ball Ball

2100 2100 2100 2100 2100

———2.8/3.8 —

1.9/2.9 1.9/2.9 2.4/3.4 — 2.4/3.4

2.8/3.8 2.8/3.8 3.4/4.4 3.4/4.4 3.4/4.4

———4.5 —

4.5 4.0 4.5 — 4.5

4.5 4.5 4.5 4.5 4.5 ———1...A...40 —

1...A...34 1...A...34 1...A...39 — 1...A...39

1...A...39 1...A...39 1...A...40 1...A...40 1...A...40 ———14.7-15.5 —

10.0-12.4 10.0-12.4 14.7-15.5 — 14.7-15.5

10.0-12.4 10.0-12.4 14.7-15.5 14.7-15.5 14.7-15.5

Enhanced Copper Tubes, Aluminum Lanced Fins

Propeller Type

/4...1100

Enhanced Copper Tubes, Aluminum Double-Wavy Fins

/4...1100

Acutrol™ Metering Device

/4...1100

Centrifugal Type

—

/4...1100

———80 — 48 70 80 — 80

65 65 60 60 60 ——— 5 —

555— 5 66555

——— 3 —

333— 3

———1225 — 856 975 1060 — 1060

1233 1233 1396 1396 1396

31/

450 ± 50 500 ± 50 450 ± 50

428 428 428 320 320 320

1...20 x 24 x 1

2...16 x 25 x 2 4...16 x 20 x 2

31/

7 ± 3

22 ± 7

30 ± 5 45 ± 5

Cleanable

Throwaway

31/

1...20 x 25 x 1

1...16 x 25 x 1

0TFQ004-012 558F036-150

31/

PHYSICAL DATA — 558F090-150

UNIT SIZE 558F 090 091 102 120 121 150 NOMINAL CAPACITY (tons)

OPERATING WEIGHT (lb)

Unit

Al/Al* Al/Cu*

Cu/Cu* EconoMi$er Roof Curb†

558F036-150

COMPRESSOR

Quantity

0TFQ004-012

No. Cylinders (per circuit) Oil (oz)

REFRIGERANT TYPE

Operating Charge (lb-oz)

Circuit 1

Circuit 2

CONDENSER COIL

Rows...Fins/in. Total Face Area (sq ft)

CONDENSER FAN

Nominal Cfm Quantity...Diameter (in.) Motor Hp...Rpm Watts Input (Total)

EVAPORATOR COIL

Rows...Fins/in. Total Face Area (sq ft)

EVAPORATOR FAN

Quantity...Size (in.) Std

Type Drive Std

Nominal Cfm Maximum Continuous Bhp Std

Motor Frame Size Std

Nominal Rpm High/Low Std

Fan Rpm Range Std

Motor Bearing Type Maximum Allowable Rpm Motor Pulley Pitch Diameter Min/Max (in.) Std

Nominal Motor Shaft Diameter (in.) Std

Fan Pulley Pitch Diameter (in.) Std

Belt, Quantity...Type...Length (in.) Std

Pulley Center Line Distance (in.) Std

Speed Change per Full Turn of

Movable Pulley Flange (rpm) Std

Movable Pulley Maximum Full Turns

From Closed Position Std

Factory Setting Std

Factory Speed Setting (rpm) Std

Fan Shaft Diameter at Pulley (in.)

HIGH-PRESSURE SWITCH (psig)

Standard Compressor Internal Relief (Differential) Cutout Reset (Auto.)

LOW-PRESSURE SWITCH (psig)

Cutout Reset (Auto.)

FREEZE-PROTECTION THERMOSTAT (F)

Opens Closes

OUTDOOR-AIR INLET SCREENS

Quantity...Size (in.)

RETURN-AIR FILTERS

Quantity...Size (in.)

LEGEND

Aluminum

Al —

Brake Horsepower

Bhp —

Copper

Cu —

*Evaporator coil fin material/condenser coil fin material. Contact your local representative for

details about coated fins.

†Weight of 14-in. roof curb.

NOTES:

1. The 558F036-150 units have a loss-of-charge switch located in the liquid line.

2. High-static motor not available on size 150 units.

Alt High-Static

755 766 766 776 937 937 957 778 778 787 960 960 980

62 62 62 62 62 62

143 143 143 143 143 143

Reciprocating Reciprocating Reciprocating Reciprocating Reciprocating Scroll

222212 222222

42 ea 42 ea 65 ea 54 ea 50 54 ea

71/

755

81/

760 915

10 121/

915

R-22

4-13 7-10 6-14 7- 3 7- 3 8-10 4-14 8- 2 9- 2 7-13 7-13 8- 6

1...17 1...17 2...17 2...17 2...17 2...17

20.50 20.50 18.00 20.47 20.47 25.00

6400 6400 6400 7000 7000 7000

2...22 2...22 2...22 2...22 2...22 2...22

/4...1100

600 600 600 600 600 600

3...15 3...15 3...15 3...15 3...15 4...15

8.0 8.0 8.0 10.0 10.0 11.1

1...15 x 15 1...15 x 15 1...15 x 15 1...15 x 15 1...15 x 15 1...15 x 15

1...15 x 15 1...15 x 15 — 1...15 x 15 1...15 x 15 1...15 x 15

1...15 x 15 1...15 x 15 1...15 x 15 1...15 x 15 1...15 x 15 — Belt Belt Belt Belt Belt Belt Belt Belt — Belt Belt Belt Belt Belt Belt Belt Belt —

3000 3000 3100 4000 4000 5000

2.40 2.40 2.40 2.40 2.40 3.70

2.40 2.40 — 2.90 2.90 5.25

3.70 3.70 3.70 5.25 5.25 —

1725 1725 1725 1725 1725 1725 590- 840 590- 840 685- 935 685- 935 685- 935 860-1080 685- 935 685- 935 — 835-1085 835-1085 900-1260 860-1080 860-1080 860-1080 830-1130 830-1130 —

Ball Ball Ball Ball Ball Ball

2100 2100 2100 2100 2100 2100

2.4/3.4 2.4/3.4 2.8/3.8 2.8/3.8 2.8/3.8 4.0/5.0

2.8/3.8 2.8/3.8 — 3.4/4.4 3.4/4.4 3.1/4.1

4.0/5.0 4.0/5.0 4.0/5.0 2.8/3.8 2.8/3.8 —

7.0 7.0 7.0 7.0 7.0 8.0

7.0 7.0 — 7.0 7.0 5.9

8.0 8.0 8.0 5.8 5.8 —

1...A...49 1...A...49 1...A...49 1...A...49 1...A...49 1...A...52

1...A...49 1...A...49 — 1...A...49 1...A...49 1...BX...46

1...A...55 1...A...55 1...A...55 1...BX...46 1...BX...46 —

16.75-19.25 16.75-19.25 16.75-19.25 15.85-17.50 15.85-17.50 15.85-17.50

15.75-19.25 15.75-19.25 — 15.85-17.50 15.85-17.50 15.85-17.50

15.75-19.25 15.75-19.25 16.75-19.25 15.85-17.50 15.85-17.50 —

590 590 685 685 685 860 685 685 — 835 835 960 860 860 860 887 887 —

Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Acutrol™ Metering Device

56 56 56 56 56 56 56 56 — 56 56 56 56 56 56 56 56 —

—————— ——————

50 50 50 50 50 44 50 50 — 50 50 50 60 60 60 60 60 —

555555 55— 556 55566— 555555 55— 555 55555—

111111

4...16 x 20 x 2 4...16 x 20 x 2 4...16 x 20 x 2 4...20 x 20 x 2 4...20 x 20 x 2 4...20 x 20 x 2

Enhanced Copper Tubes, Aluminum Lanced Fins

Propeller Type

/4...1100

Centrifugal Type

—

450 ± 50 500

428 428 320 320

7 ± 3

22 ± 7

30 ± 5 45 ± 5

Cleanable

1...20 x 25 x 1

1...16 x 25 x 1

Throwaway

/4...1100

8 8 8

930

/4...1100

—

8 8

BASE UNIT DIMENSIONS — 558F036-072

0TFQ004-012 558F036-150

BASE UNIT DIMENSIONS — 558F073

558F036-150 0TFQ004-012

+ 140 hidden pages

Bryant 551A, 558F, 551B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual