Johnson Controls R-410A, 20 J ZJ Series, ZJ SERIES Installation Manual

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R-410A SERIES 20 J**ZJ

15 - 25 Ton 60 Hertz

TABLE OF CONTENTS

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Ductwork. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Condensate Drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Power And Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 14

Optional Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Optional Gas Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Options/Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Economizer And Power Exhaust Set Point Adjustments . 29 Optional BAS-Ready Economizer Power Exhaust

Damper Set Point Adjustment. . . . . . . . . . . . . . . . . . . . . . 30

Optional Variable Air Volume (VAV) . . . . . . . . . . . . . . . . . 30

Optional Hot Gas Bypass (HGBP) . . . . . . . . . . . . . . . . . . 32

LIST OF TABLES

1 J15 thru 25 ZJ Unit Limitations . . . . . . . . . . . . . . . . . . . . . 7

2 Weights and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 J15 thru 25 ZJ Unit Accessory Weights . . . . . . . . . . . . . . 9

4 Utilities Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5 Supply Fan VFD Weights, In Lbs. . . . . . . . . . . . . . . . . . . . 9

6 J15 thru 25 ZJ Unit Clearances . . . . . . . . . . . . . . . . . . . . 11

7 Control Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

9 J15 thru 25 ZJ Physical Data . . . . . . . . . . . . . . . . . . . . . 25

10 Electric Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . 26

11 Gas Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

12 Gas Pipe Sizing - CapacIty of Pipe . . . . . . . . . . . . . . . . . 27

13 Gas Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . . . 27

14 Altitude/Temperature Correction Factors . . . . . . . . . . . . 35

Air Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . 45

No Outdoor Air Options . . . . . . . . . . . . . . . . . . . . . . . . . 45

Cooling Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . 46

Electric Heating Sequence Of Operations. . . . . . . . . . . . . 48

Electric Heat Operation Errors . . . . . . . . . . . . . . . . . . . . 48

Gas Heating Sequence Of Operations . . . . . . . . . . . . . . . 49

Gas Heating Operation Errors . . . . . . . . . . . . . . . . . . . . 50

Start-Up (Cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Start-Up (Gas Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Checking Gas Heat Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Charging The Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Unit Control Board Option Setup . . . . . . . . . . . . . . . . . . . . . . 62

Option Byte Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Heat Delay Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Optional VAV Control Board Flash Codes . . . . . . . . . . . . 62

15 Air Flow Performance - Side Duct Application . . . . . . . . 37

16 Air Flow Performance - Bottom Duct Application . . . . . . 40

17 RPM Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

18 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . . 43

19 Power Exhaust Specifications . . . . . . . . . . . . . . . . . . . . . 43

20 Limit Control Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

21 Electric Heat Anticipator Setpoint . . . . . . . . . . . . . . . . . . 49

22 Gas Heat Limit Control Setting . . . . . . . . . . . . . . . . . . . . 50

23 Gas Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . . 51

24 Gas Rate Cubic Feet Per Hour . . . . . . . . . . . . . . . . . . . . 52

25 Unit Control Board Flash Codes . . . . . . . . . . . . . . . . . . . 61

26 Heat Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

27 VAV Control Board Flash Codes . . . . . . . . . . . . . . . . . . 62

LIST OF FIGURES

1 J15 thru 25 ZJ Component Location . . . . . . . . . . . . . . . . 6

2 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Unit 6 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 Center of Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 J15 thru 25 ZJ Unit Dimensions Front View . . . . . . . . . . . 9

6 J15 thru 25 ZJ Unit Dimensions Rear View . . . . . . . . . . 10

7 J15 thru 25 ZJ Unit Dimensions Rain Hood . . . . . . . . . . 11

8 J15 thru 25 ZJ Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . 12

9 Fixed Outdoor Air Damper . . . . . . . . . . . . . . . . . . . . . . . 13

10 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

11 Field Wiring Disconnect - Cooling Unit With/

Without Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

12 Typical Field Wiring 24 Volt Thermostat . . . . . . . . . . . . 15

13 External Supply Connection External Shut-Off . . . . . . . 27

14 Bottom Supply Connection External Shut-Off . . . . . . . . 27

15 Vent and Combustion Air Hood . . . . . . . . . . . . . . . . . . . 29

16 Enthalpy Set Point Chart . . . . . . . . . . . . . . . . . . . . . . . . 33

17 Economizer Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

18 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

19 Altitude/Temperature Correction Factors . . . . . . . . . . . . 35

20 Pressure Drop Across A Dry Indoor Coil Vs. Supply

Air CFM For All Unit Tonnages . . . . . . . . . . . . . . . . . . . 44

21 Gas Valve Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

22 Gas Valve and Controls . . . . . . . . . . . . . . . . . . . . . . . . . 51

23 Proper Pilot Flame Adjustment . . . . . . . . . . . . . . . . . . . 53

24 Typical Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

25 Typical Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

26 J15ZJ (15 Ton) Charging Chart . . . . . . . . . . . . . . . . . . . 54

27 J18ZJ (17.5 Ton) Charging Chart . . . . . . . . . . . . . . . . . 54

28 J20ZJ (20 Ton) Charging Chart . . . . . . . . . . . . . . . . . . . 54

29 J25ZJ (25 Ton) Charging Chart . . . . . . . . . . . . . . . . . . . 54

30 Unit Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

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General

Johnson Controls Series 20 J**ZJ models are either single package air conditioners equipped with optional factory installed electric heaters, or single package gas-fired central heating furnaces with cooling unit. Both are designed for outdoor installation on a rooftop or slab.

The units are completely assembled on rigid, permanently attached base rails. All piping, refrigerant charge, and electrical wiring is factory installed and tested. The units require electric power, gas connection, duct connections, installation of combustion air inlet hood, flue gas outlet hoods and fixed outdoor air intake damper (units without economizer or motorized damper option only) at the point of installation.

Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury. Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier.

The supplemental electric heaters have nickel-chrome elements and utilize single point power connection.

These gas-fired heaters have aluminized-steel or optional stainless steel, tubular heat exchangers with spark ignition with proven pilot. All gas heaters are shipped from the factory equipped for natural gas use, but can be field converted to L.P./Propane with Kit Model # 1NP0418. See Gas Heat Application Data Table.

Safety Considerations

This is a safety alert symbol. When you see this symbol on labels or in manuals, be alert to the potential for personal injury.

Understand and pay particular attention the signal words

DANGER, WARNING or CAUTION. DANGER indicates an imminently hazardous situation, which,

if not avoided, WARNING indicates a potentially hazardous situation, which,

if not avoided, CAUTION indicates a potentially hazardous situation, which, if

not avoided used to alert against unsafe practices and hazards involving only property damage.

Improper installation may create a condition where the operation of the product could cause personal injury or property damage. Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual for assistance or for additional information, consult a qualified contractor, installer or service agency.

will result in death or serious injury.

could result in death or serious injury.

may result in minor or moderate injury. It is also

This system uses R-410A Refrigerant which operates at higher pressures than R-22. No other refrigerant may be used in this system. Gage sets, hoses, refrigerant containers and recovery systems must be designed to handle R-410A. If you are unsure, consult the equipment manufacturer. Failure to use R-410A compatible servicing equipment may result in property damage or injury.

If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS: a. Do not try to light any appliance. b. Do not touch any electrical switch; do not use any

phone in your building.

c. Immediately call your gas supplier from a neighbor’s

phone. Follow the gas supplier’s instructions.

d. If you cannot reach your gas supplier, call the fire

department.

Installation and service must be performed by a qualified installer, service agency or the gas supplier.

Due to system pressure, moving parts, and electrical components, installation and servicing of air conditioning equipment can be hazardous. Only qualified, trained service personnel should install, repair, or service this equipment. Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters.

Observe all precautions in the literature, labels, and tags accompanying the equipment whenever working on air conditioning equipment. Be sure to follow all other applicable

This product must be installed in strict compliance with the installation instructions and any applicable local, state and national codes including, but not limited to building, electrical, and mechanical codes.

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safety precautions and codes including ANSI Z223.1 or CSAB149.1- latest edition.

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Wear safety glasses and work gloves. Use quenching cloth and have a fire extinguisher available during brazing operations.

Inspection

As soon as a unit is received, it should be inspected for possible damage during transit. If damage is evident, the extent of the damage should be noted on the carrier’s freight bill. A separate request for inspection by the carrier’s agent should be made in writing.

This product must be installed in strict compliance with the enclosed installation instructions and any applicable local, state and national codes including, but not limited to, building, electrical, and mechanical codes.

The furnace and its individual shut-off valve must be disconnected from the gas supply piping system during any pressure testing at pressures in excess of 1/2 PSIG.

Pressures greater than 1/2 PSIG will cause gas valve damage resulting in a hazardous condition. If it is subjected to a pressure greater than 1/2 PSIG, the gas valve must be replaced.

The furnace must be isolated from the gas supply piping system by closing its individual manual shut-off valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG.

Renewal Parts

For authorized replacement parts call Johnson Controls, Inc. National Source 1 Parts outlet at 1-866-523-9670.

Approvals

Design certified by CSA as follows:

1. For use as a cooling only unit, cooling unit with

supplemental electric heat or a forced air furnace.

2. For outdoor installation only.

3. For installation on combustible material.

4. For use with natural gas (convertible to LP with kit).

This product must be installed in strict compliance with the enclosed installation instructions and any applicable local, state, and national codes including, but not limited to, building, electrical, and mechanical codes.

Improper installation may create a condition where the operation of the product could cause personal injury or property damage.

Reference

Additional information is available in the following reference forms:

• Technical Guide - J15 thru 25 ZJ/ZR/ZF, 349690

• General Installation - J15 thru 25 ZJ, 349218

This system uses R-410A Refrigerant which operates at higher pressures than R-22. No other refrigerant may be used in this system.

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349218-JIM-F-0512

Nomenclature

Nominal Cooling Capacity

J15 = 15 Ton J18 = 17.5 Ton J20 = 20 Ton J25 = 25 Ton

Product Category

Z = A/C, Single Pkg., R-410A

Heat Type and Nominal Heat Capacity

C00 = Cooling Only. No field installed

N24 = 240 MBH Output Aluminized Steel N32 = 320 MBH Output Aluminized Steel S24 = 240 MBH Output Stainless Steel S32 = 320 MBH Output Stainless Steel

E18 = 18 KW E36 = 36 KW E54 = 54 KW E72 = 72 KW

A = Std. Motor B = Std. Motor/Economizer C = Std. Motor/Economizer/Power Exhaust

(Downflow Only) D = Std. Motor/Motorized Damper E = Std. Motor/Motorized Damper/Barometric Relief J = Std. Motor/Economizer/Barometric Relief N = Hi Static P = Hi Static/Economizer Q = Hi Static/Economizer/Power Exhaust

(Downflow Only) R = Hi Static/Motorized Damper K = Hi Static/Motorized Damper/Barometric Relief S = Hi Static/Economizer/Barometric Relief 2 = Low Static 3 = Low Static/Economizer 4 = Low Static/Economizer/Power Exhaust

(Downflow Only) 5 = Low Static/Motorized Damper 6 = Low Static/Motorized Damper/Barometric Relief 7 = Low Static/Economizer/Barometric Relief

Product Identifier

J = 11.0+ EER A/C

electric heat

Gas Heat Options

Electric Heat Options

Airflow

15-25 Ton Series 20 Model Number Nomenclature

ZJJ15 N24 A 2 A AA 1 0 1 2 4 A

Product Style

A = Style A

Configuration Options (not required for all units)

For valid combinations of the above; see the equipment price pages or

the Unitary Sales Tool program; all combinations are not available

Additional Options

Hinged Filter Door & Tool Free Access Cabinet

BA = Hinged Filter Door & Tool Free BB = Phase Monitor, Hinged Filter Door & Tool Free

Access Panels

BC = Coil Guard, Hinged Filter Door & Tool Free

Access Panels

BD = Dirty Filter Switch, Hinged Filter Door &

Tool Free Access Panels

BE = Phase Monitor & Coil Guard, Hinged Filter

Door & Tool Free Access Panels

BF = Phase Monitor & Dirty Filter Switch, Hinged

Filter Door & Tool Free Access Panels

BG = Coil Guard & Dirty Filter Switch, Hinged Filter

Door & Tool Free Access Panels

BH = Phase Moni

Hinged Filter Door & Tool Free Access Panels

Voltage

2 = 208/230-3-60 4 = 460-3-60 5 = 575-3-60

These four digits will not be assigned until a quote is requested, or an order placed.

SS Drain Pan

Johnson UNT 1126 Controller (N2 protocol), DFS, APS

Johnson Commercial Controls System (CCS) Rtu Controller

Johnson Controller Metasys FEC-2611 (BACnet MS/TP Protocol), SAS, RAS, OAS, DFS, APS

CPC Controller, DFS, APS

Honeywell Controller, DFS, APS

Novar Controller, DFS, APS

Simplicity IntelliComfort II Controller

Simplicity IntelliComfort II Controller w/Simplicity™LINC

Hot Gas Bypass (Standard on VAV, Optional on CV)

Variable Air Volume, VFD

Variable Air Volume, VFD and Manual Bypass

Variable Air Volume, VFD (BAS ready - for customer provided VFD controller)

Variable Air Volume, VFD and Manual Bypass (BAS ready)

Variable Air Volume, VFD Ready (for customer provided, field installed drive)

2" Pleated Filters, MERV 7

4" Pleated Filters, MERV 13

BAS Ready Economizer (2-10 V.D.C. Actuator without a controller)

Double Wall Construction

Product Generation

1 = First Generation

Standard Cabinet

AA = None AB = Phase Monitor AC = Coil Guard AD = Dirty Filter Switch AE = Phase Monitor & Coil Guard AF = Phase Monitor & Dirty Filter Switch AG = Coil Guard & Dirty Filter Switch AH = Phase Monitor, Coil Guard & Dirty Filter Switch RC = Coil Guard & American Flag TA = Technicoat Condenser Coil TJ = Technicoat Evaporator Coil TS = Technicoat Evaporator & Condenser Coils EA = ElectroFin Condenser Coil EJ = ElectroFin Evaporator Coil ES = ElectroFin Cond & Evap Coils

ZZ = If desired option combination is not listed above, ZZ will be assigned and configuration options will be

located in digits 15-18.

Installation Options

A = No Options Installed B = Option 1 C = Option 2 D = Options 1 & 2 E = Option 3 F = Option 4 G = Options 1 & 3 H = Options 1 & 4 J = Options 1, 2 & 3 K = Options 1, 2, & 4 L = Options 1,3 & 4 M = Options 1, 2, 3, & 4

1 = Disconnect 2 = Non-Pwr'd Conv. Outlet 3 = Smoke Detector S.A.

N = Options 2 & 3 P = Options 2 & 4 Q = Options 2, 3, & 4 R = Options 3 & 4 S = Option 5 T = Options 1 & 5 U = Options 1, 3, & 5 V = Options 1, 4, & 5 W = Options 1, 3, 4, & 5 X = Options 3 & 5 Y = Options 4 & 5 Z = Options 3, 4 & 5

Options

4 = Smoke Detector R.A. 5 = Pwr'd Conv. Outlet

Access Panels

tor, Coil Guard & Dirty Filter Switch,

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349218-JIM-F-0512

Installation

Installation Safety Information

Read these instructions before continuing this appliance installation. This is an outdoor combination heating and cooling unit. The installer must assure that these instructions are made available to the consumer and with instructions to retain them for future reference.

1. Refer to the unit rating plate for the approved type of gas for this product.

2. Install this unit only in a location and position as specified on Page 7 of these instructions.

3. Never test for gas leaks with an open flame. Use commercially available soap solution made specifically for the detection of leaks when checking all connections, as specified on Pages 5, 28 and 52 of these instructions.

4. Always install furnace to operate within the furnace's intended temperature-rise range with the duct system and within the allowable external static pressure range, as specified on the unit name/rating plate, specified on Page 27 of these instructions.

5. This equipment is not to be used for temporary heating of buildings or structures under construction.

Limitations

These units must be installed in accordance with the following: In U.S.A.:

1. National Electrical Code, ANSI/NFPA No. 70 - Latest Edition

2. National Fuel Gas Code, ANSI Z223.1 - Latest Edition

3. Gas-Fired Central Furnace Standard, ANSI Z21.47a. Latest Edition

4. Local building codes, and

5. Local gas utility requirements

In Canada:

1. Canadian Electrical Code, CSA C22.1

2. Installation Codes, CSA - B149.1.

3. Local plumbing and waste water codes, and

4. Other applicable local codes.

Refer to unit application data found in this document. After installation, gas fired units must be adjusted to obtain a

temperature rise within the range specified on the unit rating plate.

FIRE OR EXPLOSION HAZARD Failure to follow the safety warning exactly could result

in serious injury, death or property damage. Never test for gas leaks with an open flame. use a

commercially available soap solution made specifically for the detection of leaks to check all connections. A fire or explosion may result causing property damage, personal injury or loss of life.

6. If a factory option convenience outlet is installed, the weatherproof outlet cover must be field installed. The cover shall be located in the unit control box. To install the cover, remove the shipping label covering the convenience outlet, follow the instructions on the back of the weatherproof cover box, and attach the cover to the unit using the (4) screws provided.

208/230-3-60 and 380/415-3-50 units with factory installed Powered Convenience Outlet Option are wired for 230v and 415v power supply respectively. Change tap on transformer for 208-3-60 or 380-3-50 operation. See unit wiring diagram.

If components are to be added to a unit to meet local codes, they are to be installed at the dealer’s and/or customer’s expense.

Size of unit for proposed installation should be based on heat loss/heat gain calculation made according to the methods of Air Conditioning Contractors of America (ACCA).

This furnace is not to be used for temporary heating of buildings or structures under construction.

The control board used in this product will effectively operate the cooling system down to 0°F when this product is applied in a comfort cooling application for people. An economizer is typically included in this type of application. When applying this product for process cooling applications (computer rooms, switchgear, etc.), please reference applications bulletin AE-011-07 or call the applications department for Unitary Products @ 1877-UPG-SERV for guidance. Additional accessories may be needed for stable operation at temperatures below 30°F.

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Slide In/ Plug In

Internal Economizer

(Optional)

2” Disposable Filters

(4” Filters Optional)

Copper Tube/ Aluminum Fin

Evaporator

Coils

Thermal

Expansion

Valve

1” NPT

Condensate Drain

Filter Drier

(Solid Core)

Unit Control Board

110 Volt Convenience

Outlet (“Powered” or

“Non-Powered” Optional)

Disconnect Location

(Optional Disconnect Switch)

Bottom Power and

Control Wiring Entry

Power Ventor Motor

Electric Heater Location

(Optional Electric/Electric Units)

Location of VFD (Optional)

Location of VFD Bypass (Optional)

Belt Drive

Blower Motor

14 Gauge

Base Rails

with Lifting Holes

Outdoor Fan #2

Outdoor Fan #1

Outdoor Fan #4

Outdoor Fan #3

Copper Tube/Aluminum Fin

Condenser Coils

Compressor #4

Compressor #3

High Efficiency Scroll Compressors

Compressor #2

Compressor #1

Figure 1: J15 thru 25 ZJ Component Location

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Table 1: J15 thru 25 ZJ Unit Limitations

349218-JIM-F-0512

Size

(Tons)

J15 (15)

J18

(17.5)

J20 (20)

J25 (25)

Unit Voltage

208/230-3-60 187 252 125

460-3-60 432 504 125 575-3-60 540 630 125

208/230-3-60 187 252 125

460-3-60 432 504 125 575-3-60 540 630 125

208/230-3-60 187 252 125

460-3-60 432 504 125 575-3-60 540 630 125

208/230-3-60 187 252 125

460-3-60 432 504 125 575-3-60 540 630 125

Applied Voltage Outdoor DB Temp

Min Max Max (°F)

Location

Use the following guidelines to select a suitable location for these units:

1. Unit is designed for outdoor installation only.

2. Condenser coils must have an unlimited supply of air. Where a choice of location is possible, position the unit on either north or east side of building.

3. Suitable for mounting on roof curb.

4. For ground level installation, use a level concrete slab with a minimum thickness of 4 inches. The length and width should be at least 6 inches greater than the unit base rails. Do not tie slab to the building foundation.

5. Roof structures must be able to support the weight of the unit and its options/accessories. Unit must be installed on a solid, level roof curb or appropriate angle iron frame.

6. Maintain level tolerance to 1/2” across the entire width and length of unit.

Unit Limitations

Clearances

All units require particular clearances for proper operation and service. Installer must make provisions for adequate combustion and ventilation air in accordance with section 5.3 of Air for Combustion and Ventilation of the National Fuel Gas Code, ANSI Z223.1 – Latest Edition (in U.S.A.), or Sections 7.2,

7.3, or 7.4 of Gas Installation Codes, CSA-B149.1 (in Canada) Latest Edition, and/or applicable provisions of the local building codes. Refer to Table 6 for clearances required for combustible construction, servicing, and proper unit operation.

Do not permit overhanging structures or shrubs to obstruct condenser air discharge outlet, combustion air inlet or vent outlets.

Rigging And Handling

Exercise care when moving the unit. Do not remove any packaging until the unit is near the place of installation. Rig the unit by attaching chain or cable slings to the lifting holes

Excessive exposure of this furnace to contaminated combustion air may result in equipment damage or personal injury. Typical contaminates include:

provided in the base rails. Spreader bars, whose length exceeds the largest dimension across the unit, MUST be used across the top of the unit.

permanent wave solution, chlorinated waxes and cleaners, chlorine based swimming pool chemicals, water softening chemicals, carbon tetrachloride, Halogen type refrigerants, cleaning solvents (e.g. perchloroethylene), printing inks, paint removers, varnishes, hydrochloric acid, cements and glues, antistatic fabric softeners for clothes dryers, masonry

If a unit is to be installed on a roof curb other than a Unitary Products roof curb, gasketing must be applied to all surfaces that come in contact with the unit underside.

acid washing materials.

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Before lifting, make sure the unit weight is distributed equally on the rigging cables so it will lift evenly.

Units may be moved or lifted with a forklift, from the side only, providing an accessory skid is used.

LENGTH OF FORKS MUST BE A MINIMUM OF 90 INCHES.

All panels must be secured in place when the unit is lifted.

The condenser coils should be protected from rigging cable damage with plywood or other suitable material.

Figure 3: Unit 6 Point Load Weight

Figure 2: Unit 4 Point Load Weight Table 2: Weights and Dimensions

Size

(Tons)

J15ZJ

(15) J18ZJ (17.5) J20ZJ

(20) J25ZJ

(25)

Weight (lbs.) Center of Gravity 4 Point Load Location (lbs.) 6 Point Load Location (lbs.)

Shipping Operating X Y ABCDABCDEF

2614 2609 85.25 44 467 781 852 510 287 392 568 620 428 313

2670 2665 85.25 44 477 797 870 520 293 401 580 633 437 320

2702 2697 85.05 44 485 805 878 529 298 406 585 638 443 326

2788 2783 85.25 44 498 833 908 544 306 419 606 661 457 334

LEFT

FRONT

Figure 4: Center of Gravity

8 Johnson Controls Unitary Products

Page 9

Table 3: J15 thru 25 ZJ Unit Accessory Weights

136-1/4

Weight (lbs.)

21.00

7-1/8

6-3/8

46-5/8

5-7/8

35-1/4

2-3/4

11-1/8

12-1/2

46-5/8

9-3/4

RETURN AIR

21-1/2

ECONOMIZER / MOTORIZED DAMPER FIXED OUTDOOR INTAKE AIR AND POWER EXHAUST RAIN HOODS (See detail Y)

11-1/2

SUPPLY AIR

9-1/4

Unit Accessory

Shipping Operating

Economizer 165 160

Power Exhaust 90 85

Electric Heat

Gas Heat

40 40

240 240

Double Wall 260 260

Motorized Damper 150 150

Barometric Damper 50 45

Econ./Motorized Damper Rain Hood 60 55

Econ./Power Exhaust Rain Hood 95 90

Wood Skid 220 220

Roof Curb 190 185

Hot Gas Bypass 10 10

Supply Fan VFD See Table 5

1. Weight given is for the maximum heater size available (54KW).

2. Weight given is for the maximum number of tube heat exchangers available (8 tube).

BLOWER MOTOR

ACCESS (Location BLOWER COMPARTMENT ACCESS (Auxiliary)

of Optional VFD Bypass)

DOT PLUG (For pressure drop reading)

GAS OR ELECTRIC HEAT ACCESS

UNIT BASE RAILS Shown separately to illustrate Bottom Duct openings. Power and Gas Piping Connection location.

NOTE: For curb mounted units, refer to the curb hanger dimensions of the curb for proper size of the supply and return air duct connections.

VENT AIR OUTLET HOODS

COMBUSTION AIR INLET HOOD

52-5/8

BLOWER ACCESS (Location of Optional VFD)

CONTROL BOX ACCESS

(D) GAS SUPPLY ENTRY

Figure 5: J15 thru 25 ZJ Unit Dimensions Front View Table 4: Utilities Entry

Hole

B C 2-3/8” KO Gas Piping (Front)

D 1-11/16” Hole Gas Piping (Bottom)

1. One-inch Gas Piping NPT Required.

2. Opening in the bottom to the unit can be located by the slice in the

Note:All entry holes should be sealed to prevent rain water entry

Opening Size

Diameter

1-1/8” KO

3/4” NPS (Fem.) Bottom

3-5/8” KO

3” NPS (Fem.) Bottom

Control Wiring

Power Wiring

Used For

insulation.

into building.

Front

1,2

Table 5: Supply Fan VFD Weights, In Lbs.

W/O Manual Bypass

W/Manual Bypass

349218-JIM-F-0512

DISCONNECT SWITCH LOCATION

3-3/4

(B) POWER WIRING ENTRY

5.0 hp

7.5 hp

5.0 hp

7.5 hp

COMPRESSOR ACCESS

CONDENSER COILS

(A) CONTROL WIRING ENTRY

COIL GUARD KIT

25 25 30 30 30 30 30 30 35 30 30 40

30 30 35 35 35 35 35 35 40 40 35 45

180-19/32

(B) POWER WIRING ENTRY

BOTTOM SUPPLY AND RETURN AIR OPENINGS (See Note)

8-1/8

(A) CONTROL WIRING ENTRY

9-3/4

Supply Fan Motor 230V 460V 575V

10.0 hp

15.0 hp

10.0 hp

15.0 hp

Johnson Controls Unitary Products 9

Page 10

349218-JIM-F-0512

Dot Plug

(for Pressure

Drop Reading)

Evaporator

Section

40-3/8”

Supply Air

Access

Dimensions listed are for side duct flange opening; see Field Accessories

Supply

Air

Return

Air

18-5/8”

27-3/4”

5-1/8”

Return Air

Access

for Side Duct Flange Kit.

Figure 6: J15 thru 25 ZJ Unit Dimensions Rear View NOTE: Units are shipped with the bottom duct openings

covered. An accessory flange kit is available for connecting side ducts.

For

bottom duct applications:

1. Remove the side panels from the supply and return air compartments to gain access to the bottom supply and return air duct covers.

2. Remove and discard the bottom duct covers. Duct openings are closed with sheet metal covers except when the unit includes a power exhaust option. The covering consists of a heavy black paper composition.

3. Replace the side supply and return air compartment panels.

Outdoor

Air

40-1/2”

Filter

39-5/8”

Outdoor Air

Compartment

Access

1” NPT Female

Cond. Drain

Connector

For side duct applications:

1. Replace the side panels on the supply and return air compartments with the accessory flange kit panels.

2. Connect ductwork to the flanges on those panels.

10 Johnson Controls Unitary Products

Page 11

349218-JIM-F-0512

Economizer Motorized

Damper Rain Hood

(on Outdoor

Air Compartment)

36-5/8”

Economizer/Motorized Damper and Power Exhaust Rain Hood

Fixed

Outdoor Air Intake Hood (Located on

Return Air

Compartment)

16-1/8”

5”

Supply Air

Compartment

Power Exhaust

Rain Hood (on Return

Air Compartment)

Rear View

Detail “Y”

Unit with Rain Hoods

Figure 7: J15 thru 25 ZJ Unit Dimensions Rain Hood Table 6: J15 thru 25 ZJ Unit Clearances

Direction Distance (in.) Direction Distance (in.)

Top

Front 36 Bottom Rear

1. Units must be installed outdoors. Over hanging structure or shrubs should not obscure condenser air discharge outlet.

2. Units may be installed on combustable floors made from wood or class A, B or C roof covering materials.

3. If economizer is factory installed, the unassembled rain hood must be removed from its ride along position in front of the evaporator coil, or in the outdoor air compartment, prior to final installation.

Note:ELEC/ELEC Models: Units and ductwork are approved for zero clearance to combustible material when

equipped with electric heaters. GAS/ELEC Models: A 1" clearance must be provided between any combustible material and the supply air ductwork for a distance of 3 feet from the unit.

The products of combustion must not be allowed to accumulate within a confined space and recirculate. Locate unit so that the vent air outlet hood is at least:

• Three (3) feet above any force air inlet located within 10 horizontal feet (excluding those integral to the unit).

• Four (4) feet below, four horizontal feet from, or one foot above any door or gravity air inlet into the building.

• Four (4) feet from electric and gas meters, regulators and relief equipment.

72 With 36 Maximum

Horizontal Overhang (For

Condenser Air Discharge)

24 (W/O Economizer)

49 (W/Economizer) 36 (W/Economizer)

Right 36

Left

24 (W/O Economizer)

1” Condensate Drain (Must be

Trapped)

92”28-3/16”

LH View

Johnson Controls Unitary Products 11

Page 12

349218-JIM-F-0512

Figure 8: J15 thru 25 ZJ Roof Curb

25-1/4"

Ductwork

Ductwork should be designed and sized according to the methods in Manual D of the Air Conditioning Contractors of America (ACCA) or as recommended by any other recognized authority such as ASHRAE or SMACNA.

A closed return duct system should be used. This will not preclude use of economizers or outdoor fresh air intake. The supply and return air duct connections at the unit should be made with flexible joints to minimize noise.

The supply and return air duct systems should be designed for the CFM and static pressure requirements of the job. They should NOT be sized to match the dimensions of the duct connections on the unit.

Refer to Figure 5 for bottom air duct openings. Refer to Figure 6 for side air duct openings.

NOTE: It is recommended that, in Canada, the outlet duct be

provided with a removable access panel. It is recommended that this opening be accessible when the unit is installed in service, and of a size such that smoke or reflected light may be observed inside the casing to indicate the presence of leaks in the heat exchanger. The cover should be attached in a manner adequate to prevent leakage.

Gasketing and mounting screws are provided in a parts bag attached to the hood assembly. Apply gasketing to the three flange surfaces on the hood prior to installing the hood. Extend gasketing 1/4 inch beyond the top and bottom of the two side flanges to insure adequate sealing.

Adjusting the damper to the desired air flow may be done before mounting the hood into position or after installation by removing the front hood panel or the screen on the bottom of the hood. Damper baffle in position 1 will allow approximately 10% outdoor air flow, position 2 approximately 15% and, to allow approximately 25%, remove the damper baffle.

On units with bottom return air application install the damper assembly over the opening in the side return air access panel. Remove and discard the opening cover and the covering over the hood mounting holes (used for shipping) before installing. Secure with the screws provided.

On units with side return air applications, install the damper assembly on the return air ductwork as close to the unit as possible. Cut an opening 16 inches high by 18 inches wide in the ductwork to accommodate the damper. Using the holes in the hood flanges as a template, drill 9/64 inch diameter (#26 drill) holes into the ductwork and secure with the screws provided.

Fixed Outdoor Air Intake Damper

This damper is shipped inside the return air compartment. It is completely assembled and ready for installation. A damper baffle inside of the hood is adjustable to provide variable amounts of outdoor air intake on units that are not provided with an economizer or a motorized damper option. Refer to the Fixed Outdoor Damper Figure 9.

12 Johnson Controls Unitary Products

If outdoor air intake will not be required on units with bottom return air applications, the damper assembly should still be mounted on the side return air access panel, per the instructions above, to insure moisture is not drawn into the unit during operation. The covering over the mounting holes only need be removed. Do not remove the opening cover.

Page 13

Side Supply

Air Access

Panel

349218-JIM-F-0512

The compressor also uses a polyolester (POE oil), Mobil 3MA POE. This oil is extremely hygroscopic, meaning it absorbs water readily. POE oil can absorb 15 times as much water as other oils designed for HCFC and CFC refrigerants. Take all necessary precautions to avoid exposure of the oil to the atmosphere.

Screen

Flange

Side Return Air

Access Panel

Rear View

Outdoor Air

Opening Cover

Damper

Baffle

Hood

* Gasketed

Figure 9: Fixed Outdoor Air Damper

Condensate Drain

Plumbing must conform to local codes. Use a sealing compound on male pipe threads. Install a condensate drain line from the one-inch NPT female connection on the unit to an open drain.

NOTE: The condensate drain operates in a negative pressure

in the cabinet. The condensate drain line MUST be trapped to provide proper drainage. See Figure 10.

Base

Pan

Unit Condensate

Connection

3” Min.

Do not leave the system open to the atmosphere. Unit damage could occur due to moisture being absorbed by the POE oil in the system. This type of oil is highly susceptible to moisture absorption

POE (polyolester) compressor lubricants are known to cause long term damage to some synthetic roofing materials.

Exposure, even if immediately cleaned up, may cause embrittlement (leading to cracking) to occur in one year or more. When performing any service that may risk exposure of compressor oil to the roof, take precautions to protect roofing.

Procedures which risk oil leakage include, but are not limited to, compressor replacement, repairing refrigerant leaks, replacing refrigerant components such as filter drier, pressure switch, metering device or coil.

Units are shipped with compressor mountings which are factory-adjusted and ready for operation.

2”

Drain

Plug

Base Rails

Figure 10: Condensate Drain

Compressors

The scroll compressor used in this product is specifically designed to operate with R-410A Refrigerant and cannot be interchanged.

This system uses R-410A Refrigerant which operates at higher pressures than R-22. No other refrigerant may be used in this system.

Do not loosen compressor mounting bolts.

Filters

Two-inch filters are supplied with each unit, but units can be converted easily to four-inch filters. Filters must always be installed ahead of the evaporator coil and must be kept clean or replaced with same size and type. Dirty filters will reduce the capacity of the unit and will result in frosted coils or safety shutdown. Minimum filter area and required sizes are shown in Physical Data Table 9.

Make sure that panel latches are properly positioned on the unit to maintain an airtight seal.

Johnson Controls Unitary Products 13

Page 14

349218-JIM-F-0512

Power And Control Wiring

Field wiring to the unit, fuses, and disconnects must conform to provisions of National Electrical Code (NEC), ANSI/NFPA No. 70 – Latest Edition (in U.S.A.), current Canadian Electrical Code C221, and/or local ordinances. The unit must be electrically grounded in accordance with NEC and CEC as specified above and/or local codes.

208/230-3-60 and 380/415-3-50 units control transformers are factory wired for 230v and 415v power supply respectively. Change tap on transformer for 2083-60 or 380-3-50 operation. See unit wiring diagram.

Voltage tolerances which must be maintained at the compressor terminals during starting and running conditions are indicated on the unit Rating Plate and Table 1.

The internal wiring harnesses furnished with this unit are an integral part of the design certified unit. Field alteration to comply with electrical codes should not be required. If any of the wire supplied with the unit must be replaced, replacement wire must be of the type shown on the wiring diagram and the same minimum gauge as the replaced wire.

A disconnect must be utilized for these units. Factory installed disconnects are available. If installing a disconnect (field supplied or Unitary Products supplied accessory), refer to Figure 1 for the recommended mounting location.

Avoid damage to internal components if drilling holes for disconnect mounting.

NOTE: Since not all local codes allow the mounting of a

disconnect on the unit, please confirm compliance with local code before mounting a disconnect on the unit.

Electrical line must be sized properly to carry the load. USE COPPER CONDUCTORS ONLY. Each unit must be wired with a separate branch circuit fed directly from the meter panel and properly fused.

Refer to Figures 11 and 12 for typical field wiring and to the appropriate unit wiring diagram mounted inside control doors for control circuit and power wiring information.

When connecting electrical power and control wiring to the unit, water-proof connectors must be used so that water or moisture cannot be drawn into the unit during normal operation. The above water-proofing conditions will also apply when installing a field supplied disconnect switch.

Power Wiring Detail

Units are factory wired for the voltage shown on the unit nameplate. Refer to Electrical Data Table 8 to size power wiring, fuses, and disconnect switch.

Power wiring is brought into the unit through the side of the unit or the basepan inside the curb.

TERMINAL BLOCK TB1

GROUND

LUG

FACTORY OR FIELD

SUPPLIED DISCONNECT

Figure 11: Field Wiring Disconnect - Cooling Unit With/Without Electric Heat

THREE

PHASE POWER SUPPLY

14 Johnson Controls Unitary Products

Page 15

349218-JIM-F-0512

Thermostat Wiring

The thermostat should be located on an inside wall approximately 56 inch above the floor where it will not be subject to drafts, sun exposure or heat from electrical fixtures or appliances. Follow the manufacturer's instructions enclosed with thermostat for general installation procedure. Seven (7) color-coded, insulated wires should be used to connect the thermostat to the unit. Refer to Table 7 for control wire sizing and maximum length.

CONTROL

THERMOSTAT

TERMINALS

TERMINAL

BLOCK

OCC

Space Sensor

The space sensor, if used, should be located on an inside wall approximately 56 inches above the floor where it will not be subject to drafts, sun exposure or heat from electrical fixtures or appliances. Follow manufacturer's instructions enclosed with sensor for general installation procedure.

Table 7: Control Wire Sizes

Wire Size Maximum Length

18 AWG 150 Feet

1. From the unit to the thermostat and back to the unit.

OCC

EXPANSION

BOARD

TERMINAL

BLOCK

TERMINALS ON

A LIMITED

NUMBER OF

THERMOSTATS

Figure 12: Typical Field Wiring 24 Volt Thermostat

Second stage heating not required on single stage heating units.

Jumper is required if there is no S moke Detect or circuit.

Jumper is required for any combination of R, RC, or RH.

OCC is an output from the thermostat to in dicate the Occup ied condition.

X is an input to the thermostat to display Error Status conditions.

Smoke

Detector

Jumper

24 VAC Class 2

Johnson Controls Unitary Products 15

Page 16

349218-JIM-F-0512

Table 8: Electrical Data J15 thru 25 ZJ - Standard Drive Without Powered Convenience Outlet

Size

(Tons)

(17.5)

Volt

208-3-60 14.7 115 23.0 2.1 15.4 0.0

230-3-60 14.7 115 23.0 2.1 14.4 0.0

J15

(15)

460-3-60 7.7 50 12.0 1.1 7.2 0.0

575-3-60 6.4 40 10.0 0.9 5.9 0.0

208-3-60 16.7 120 26.0 2.1 15.4 0.0

230-3-60 16.7 120 26.0 2.1 14.4 0.0

J18

460-3-60 8.7 60 15.5 1.1 7.2 0.0

575-3-60 6.7 42 10.5 0.9 5.9 0.0

208-3-60 17.9 120 28.0 3.7 15.4 0.0

230-3-60 17.9 120 28.0 3.7 14.4 0.0

J20 (20)

460-3-60 9.6 70 15.0 1.9 7.2 0.0

575-3-60 7.4 53 11.5 1.5 5.9 0.0

Compressors

(each)

RLA LRA MCC FLA FLA FLA Model kW Stages Amps

OD Fan

Motors

(each)

Supply Blower

Motor

Pwr

Conv

Outlet

Max Fuse2/

Electric Heat Option

None - - - 86.5 100

E18 13.5 1 37.5 86.5 100 E36 27.0 2 74.9 112.9 125 E54 40.6 2 112.7 160.1 175 E72 54.1 2 150.2 169.4 200

None - - - 85.3 90

E18 18.0 1 43.3 85.3 90 E36 36.0 2 86.6 126.3 150 E54 54.0 2 129.9 147.9 175 E72 72.0 2 173.2 191.2 225

None - - - 44.3 50

E18 18.0 1 21.7 44.3 50 E36 36.0 2 43.3 63.1 70 E54 54.0 2 65.0 74.0 90 E72 72.0 2 86.6 95.6 110

None - - - 36.7 40

E18 18.0 1 17.3 36.7 40 E36 36.0 2 34.6 50.7 60 E54 54.0 2 52.0 59.3 70 E72 72.0 2 69.3 76.7 90

None - - - 94.8 110

E18 13.5 1 37.5 94.8 110 E36 27.0 2 74.9 112.9 125 E54 40.6 2 112.7 160.1 175 E72 54.1 2 150.2 169.4 200

None - - - 93.8 110

E18 18.0 1 43.3 93.8 110 E36 36.0 2 86.6 126.3 150 E54 54.0 2 129.9 147.9 175 E72 72.0 2 173.2 191.2 225

None - - - 48.6 50

E18 18.0 1 21.7 48.6 50 E36 36.0 2 43.3 63.1 70 E54 54.0 2 65.0 74.0 90 E72 72.0 2 86.6 95.6 110

None - - - 38.0 40

E18 18.0 1 17.3 38.0 40 E36 36.0 2 34.6 50.7 60 E54 54.0 2 52.0 59.3 70 E72 72.0 2 69.3 76.7 90

None - - - 106.3 110

E18 13.5 1 37.5 106.3 110 E36 27.0 2 74.9 112.9 125 E54 40.6 2 112.7 160.1 175 E72 54.1 2 150.2 169.4 200

None - - - 105.3 110

E18 18.0 1 43.3 105.3 110 E36 36.0 2 86.6 126.3 150 E54 54.0 2 129.9 147.9 175 E72 72.0 2 173.2 191.2 225

None - - - 55.6 60

E18 18.0 1 21.7 55.6 60 E36 36.0 2 43.3 63.1 70 E54 54.0 2 65.0 74.0 90 E72 72.0 2 86.6 95.6 110

None - - - 43.4 50

E18 18.0 1 17.3 43.4 50 E36 36.0 2 34.6 50.7 60 E54 54.0 2 52.0 59.3 70 E72 72.0 2 69.3 76.7 90

MCA

(Amps)

Breaker

Size

(Amps)

16 Johnson Controls Unitary Products

Page 17

J15 thru 25 ZJ - Standard Drive Without Powered Convenience Outlet (Continued)

Size

(Tons)

Volt

208-3-60 23.0 160 31.5 3.7 28.0 0.0

230-3-60 23.0 160 31.5 3.7 26.0 0.0

J25 (25)

460-3-60 12.2 87 17.1 1.9 13.0 0.0

575-3-60 8.7 62 13.5 1.5 10.3 0.0

Compressors

(each)

RLA LRA MCC FLA FLA FLA Model kW Stages Amps

OD Fan

Motors

(each)

1. Minimum Circuit Ampacity.

2. Dual Element, Time Delay Type.

3. HACR type per NEC.

Supply Blower

Motor

Pwr

Conv

Outlet

Electric Heat Option

None - - - 141.8 150

E18 13.5 1 37.5 141.8 150 E36 27.0 2 74.9 141.8 150 E54 40.6 2 112.7 175.9 200 E72 54.1 2 150.2 185.2 200

None - - - 139.3 150

E18 18.0 1 43.3 139.3 150 E36 36.0 2 86.6 140.8 150 E54 54.0 2 129.9 162.4 175 E72 72.0 2 173.2 205.7 225

None - - - 72.7 80

E18 18.0 1 21.7 72.7 80 E36 36.0 2 43.3 72.7 80 E54 54.0 2 65.0 81.2 90 E72 72.0 2 86.6 102.9 110

None - - - 53.7 60

E18 18.0 1 17.3 53.7 60 E36 36.0 2 34.6 56.2 60 E54 54.0 2 52.0 64.8 70 E72 72.0 2 69.3 82.2 90

MCA

(Amps)

Max Fuse2/

Breaker

Size

(Amps)

349218-JIM-F-0512

Johnson Controls Unitary Products 17

Page 18

349218-JIM-F-0512

J15 thru 25 ZJ - Standard Drive With Powered Convenience Outlet

Size

(Tons)

(17.5)

Volt

208-3-60 14.7 115 23.0 2.1 15.4 10.0

230-3-60 14.7 115 23.0 2.1 14.4 10.0

J15 (15)

460-3-60 7.7 50 12.0 1.1 7.2 5.0

575-3-60 6.4 40 10.0 0.9 5.9 4.0

208-3-60 16.7 120 26.0 2.1 15.4 10.0

230-3-60 16.7 120 26.0 2.1 14.4 10.0

J18

460-3-60 8.7 60 15.5 1.1 7.2 5.0

575-3-60 6.7 42 10.5 0.9 5.9 4.0

208-3-60 17.9 120 28.0 3.7 15.4 10.0

230-3-60 17.9 120 28.0 3.7 14.4 10.0

J20 (20)

460-3-60 9.6 70 15.0 1.9 7.2 5.0

575-3-60 7.4 53 11.5 1.5 5.9 4.0

Compressors

RLA LRA MCC FLA FLA FLA Model kW Stages Amps

(each)

OD Fan

Motors

(each)

Supply Blower

Motor

Pwr

Conv

Outlet

Electric Heat Option

None - - - 96.5 110

E18 13.5 1 37.5 96.5 110 E36 27.0 2 74.9 125.4 150 E54 40.6 2 112.7 172.6 175 E72 54.1 2 150.2 181.9 200

None - - - 95.3 100

E18 18.0 1 43.3 95.3 100 E36 36.0 2 86.6 138.8 150 E54 54.0 2 129.9 160.4 175 E72 72.0 2 173.2 203.7 225

None - - - 49.3 50

E18 18.0 1 21.7 49.3 50 E36 36.0 2 43.3 69.4 70 E54 54.0 2 65.0 80.2 90 E72 72.0 2 86.6 101.9 110

None - - - 40.7 45

E18 18.0 1 17.3 40.7 45 E36 36.0 2 34.6 55.7 60 E54 54.0 2 52.0 64.3 70 E72 72.0 2 69.3 81.7 90

None - - - 104.8 110

E18 13.5 1 37.5 104.8 110 E36 27.0 2 74.9 125.4 150 E54 40.6 2 112.7 172.6 175 E72 54.1 2 150.2 181.9 200

None - - - 103.8 110

E18 18.0 1 43.3 103.8 110 E36 36.0 2 86.6 138.8 150 E54 54.0 2 129.9 160.4 175 E72 72.0 2 173.2 203.7 225

None - - - 53.6 60

E18 18.0 1 21.7 53.6 60 E36 36.0 2 43.3 69.4 70 E54 54.0 2 65.0 80.2 90 E72 72.0 2 86.6 101.9 110

None - - - 42.0 45

E18 18.0 1 17.3 42.0 45 E36 36.0 2 34.6 55.7 60 E54 54.0 2 52.0 64.3 70 E72 72.0 2 69.3 81.7 90

None - - - 116.3 125

E18 13.5 1 37.5 116.3 125 E36 27.0 2 74.9 125.4 150 E54 40.6 2 112.7 172.6 175 E72 54.1 2 150.2 181.9 200

None - - - 115.3 125

E18 18.0 1 43.3 115.3 125 E36 36.0 2 86.6 138.8 150 E54 54.0 2 129.9 160.4 175 E72 72.0 2 173.2 203.7 225

None - - - 60.6 70

E18 18.0 1 21.7 60.6 70 E36 36.0 2 43.3 69.4 70 E54 54.0 2 65.0 80.2 90 E72 72.0 2 86.6 101.9 110

None - - - 47.4 50

E18 18.0 1 17.3 47.4 50 E36 36.0 2 34.6 55.7 60 E54 54.0 2 52.0 64.3 70 E72 72.0 2 69.3 81.7 90

MCA

(Amps)

Max Fuse

Breaker

Size

(Amps)

18 Johnson Controls Unitary Products

Page 19

J15 thru 25 ZJ - Standard Drive With Powered Convenience Outlet (Continued)

Size

(Tons)

Volt

208-3-60 23.0 160 31.5 3.7 28.0 10.0

230-3-60 23.0 160 31.5 3.7 26.0 10.0

J25 (25)

460-3-60 12.2 87 17.1 1.9 13.0 5.0

575-3-60 8.7 62 13.5 1.5 10.3 4.0

Compressors

(each)

RLA LRA MCC FLA FLA FLA Model kW Stages Amps

OD Fan

Motors

(each)

1. Minimum Circuit Ampacity.

2. Dual Element, Time Delay Type.

3. HACR type per NEC.

Supply Blower

Motor

Pwr

Conv

Outlet

Electric Heat Option

None - - - 151.8 175

E18 13.5 1 37.5 151.8 175 E36 27.0 2 74.9 151.8 175 E54 40.6 2 112.7 188.4 200 E72 54.1 2 150.2 197.7 200

None - - - 149.3 175

E18 18.0 1 43.3 149.3 175 E36 36.0 2 86.6 153.3 175 E54 54.0 2 129.9 174.9 175 E72 72.0 2 173.2 218.2 225

None - - - 77.7 90

E18 18.0 1 21.7 77.7 90 E36 36.0 2 43.3 77.7 90 E54 54.0 2 65.0 87.5 90 E72 72.0 2 86.6 109.1 110

None - - - 57.7 60

E18 18.0 1 17.3 57.7 60 E36 36.0 2 34.6 61.2 70 E54 54.0 2 52.0 69.8 70 E72 72.0 2 69.3 87.2 90

MCA

(Amps)

Max Fuse2/

Breaker

Size

(Amps)

349218-JIM-F-0512

Johnson Controls Unitary Products 19

Page 20

349218-JIM-F-0512

J15 thru 25 ZJ - High Static Drive Without Powered Convenience Outlet

Size

(Tons)

(17.5)

Volt

208-3-60 14.7 115 23.0 2.1 15.4 0.0

230-3-60 14.7 115 23.0 2.1 14.4 0.0

J15 (15)

460-3-60 7.7 50 12.0 1.1 7.2 0.0

575-3-60 6.4 40 10.0 0.9 5.9 0.0

208-3-60 16.7 120 26.0 2.1 20.0 0.0

230-3-60 16.7 120 26.0 2.1 20.0 0.0

J18

460-3-60 8.7 60 15.5 1.1 10.0 0.0

575-3-60 6.7 42 10.5 0.9 8.2 0.0

208-3-60 17.9 120 28.0 3.7 20.0 0.0

230-3-60 17.9 120 28.0 3.7 20.0 0.0

J20 (20)

460-3-60 9.6 70 15.0 1.9 10.0 0.0

575-3-60 7.4 53 11.5 1.5 8.2 0.0

Compressors

RLA LRA MCC FLA FLA FLA Model kW Stages Amps

(each)

OD Fan

Motors

(each)

Supply Blower

Motor

Pwr

Conv

Outlet

Max Fuse

Electric Heat Option

None - - - 86.5 100

E18 13.5 1 37.5 86.5 100 E36 27.0 2 74.9 112.9 125 E54 40.6 2 112.7 160.1 175 E72 54.1 2 150.2 169.4 200

None - - - 85.3 90

E18 18.0 1 43.3 85.3 90 E36 36.0 2 86.6 126.3 150 E54 54.0 2 129.9 147.9 175 E72 72.0 2 173.2 191.2 225

None - - - 44.3 50

E18 18.0 1 21.7 44.3 50 E36 36.0 2 43.3 63.1 70 E54 54.0 2 65.0 74.0 90 E72 72.0 2 86.6 95.6 110

None - - - 36.7 40

E18 18.0 1 17.3 36.7 40 E36 36.0 2 34.6 50.7 60 E54 54.0 2 52.0 59.3 70 E72 72.0 2 69.3 76.7 90

None - - - 100.2 110

E18 13.5 1 37.5 100.2 110 E36 27.0 2 74.9 118.7 125 E54 40.6 2 112.7 165.9 175 E72 54.1 2 150.2 175.2 200

None - - - 100.2 110

E18 18.0 1 43.3 100.2 110 E36 36.0 2 86.6 133.3 150 E54 54.0 2 129.9 154.9 175 E72 72.0 2 173.2 198.2 225

None - - - 51.7 60

E18 18.0 1 21.7 51.7 60 E36 36.0 2 43.3 66.6 70 E54 54.0 2 65.0 77.5 90 E72 72.0 2 86.6 99.1 110

None - - - 40.7 45

E18 18.0 1 17.3 40.7 45 E36 36.0 2 34.6 53.6 60 E54 54.0 2 52.0 62.2 70 E72 72.0 2 69.3 79.5 90

None - - - 111.4 125

E18 13.5 1 37.5 111.4 125 E36 27.0 2 74.9 118.7 125 E54 40.6 2 112.7 165.9 175 E72 54.1 2 150.2 175.2 200

None - - - 111.4 125

E18 18.0 1 43.3 111.4 125 E36 36.0 2 86.6 133.3 150 E54 54.0 2 129.9 154.9 175 E72 72.0 2 173.2 198.2 225

None - - - 58.5 60

E18 18.0 1 21.7 58.5 60 E36 36.0 2 43.3 66.6 70 E54 54.0 2 65.0 77.5 90 E72 72.0 2 86.6 99.1 110

None - - - 45.9 50

E18 18.0 1 17.3 45.9 50 E36 36.0 2 34.6 53.6 60 E54 54.0 2 52.0 62.2 70 E72 72.0 2 69.3 79.5 90

MCA

(Amps)

Breaker

Size

(Amps)

20 Johnson Controls Unitary Products

Page 21

J15 thru 25 ZJ - High Static Drive Without Powered Convenience Outlet (Continued)

Size

(Tons)

Volt

208-3-60 23.0 160 31.5 3.7 38.6 0.0

230-3-60 23.0 160 31.5 3.7 38.6 0.0

J25 (25)

460-3-60 12.2 87 17.1 1.9 19.3 0.0

575-3-60 8.7 62 13.5 1.5 15.4 0.0

Compressors

(each)

RLA LRA MCC FLA FLA FLA Model kW Stages Amps

OD Fan

Motors

(each)

1. Minimum Circuit Ampacity.

2. Dual Element, Time Delay Type.

3. HACR type per NEC.

Supply Blower

Motor

Pwr

Conv

Outlet

Electric Heat Option

None - - - 155.1 175

E18 13.5 1 37.5 155.1 175 E36 27.0 2 74.9 155.1 175 E54 40.6 2 112.7 189.1 200 E72 54.1 2 150.2 198.4 225

None - - - 155.1 175

E18 18.0 1 43.3 155.1 175 E36 36.0 2 86.6 156.5 175 E54 54.0 2 129.9 178.2 200 E72 72.0 2 173.2 221.5 250

None - - - 80.5 90

E18 18.0 1 21.7 80.5 90 E36 36.0 2 43.3 80.5 90 E54 54.0 2 65.0 89.1 100 E72 72.0 2 86.6 110.7 125

None - - - 60.1 70

E18 18.0 1 17.3 60.1 70 E36 36.0 2 34.6 62.6 70 E54 54.0 2 52.0 71.2 80 E72 72.0 2 69.3 88.5 100

MCA

(Amps)

Max Fuse2/

Breaker

Size

(Amps)

349218-JIM-F-0512

Johnson Controls Unitary Products 21

Page 22

349218-JIM-F-0512

J15 thru 25 ZJ - High Static Drive With Powered Convenience Outlet

Size

(Tons)

(17.5)

Volt

208-3-60 14.7 115 23.0 2.1 15.4 10.0

230-3-60 14.7 115 23.0 2.1 14.4 10.0

J15 (15)

460-3-60 7.7 50 12.0 1.1 7.2 5.0

575-3-60 6.4 40 10.0 0.9 5.9 4.0

208-3-60 16.7 120 26.0 2.1 20.0 10.0

230-3-60 16.7 120 26.0 2.1 20.0 10.0

J18

460-3-60 8.7 60 15.5 1.1 10.0 5.0

575-3-60 6.7 42 10.5 0.9 8.2 4.0

208-3-60 17.9 120 28.0 3.7 20.0 10.0

230-3-60 17.9 120 28.0 3.7 20.0 10.0

J20 (20)

460-3-60 9.6 70 15.0 1.9 10.0 5.0

575-3-60 7.4 53 11.5 1.5 8.2 4.0

Compressors

RLA LRA MCC FLA FLA FLA Model kW Stages Amps

(each)

OD Fan

Motors

(each)

Supply Blower

Motor

Pwr

Conv

Outlet

Max Fuse

Electric Heat Option

None - - - 96.5 110

E18 13.5 1 37.5 96.5 110 E36 27.0 2 74.9 125.4 150 E54 40.6 2 112.7 172.6 175 E72 54.1 2 150.2 181.9 200

None - - - 95.3 100

E18 18.0 1 43.3 95.3 100 E36 36.0 2 86.6 138.8 150 E54 54.0 2 129.9 160.4 175 E72 72.0 2 173.2 203.7 225

None - - - 49.3 50

E18 18.0 1 21.7 49.3 50 E36 36.0 2 43.3 69.4 70 E54 54.0 2 65.0 80.2 90 E72 72.0 2 86.6 101.9 110

None - - - 40.7 45

E18 18.0 1 17.3 40.7 45 E36 36.0 2 34.6 55.7 60 E54 54.0 2 52.0 64.3 70 E72 72.0 2 69.3 81.7 90

None - - - 110.2 125

E18 13.5 1 37.5 110.2 125 E36 27.0 2 74.9 131.2 150 E54 40.6 2 112.7 178.4 200 E72 54.1 2 150.2 187.7 200

None - - - 110.2 125

E18 18.0 1 43.3 110.2 125 E36 36.0 2 86.6 145.8 150 E54 54.0 2 129.9 167.4 175 E72 72.0 2 173.2 210.7 225

None - - - 56.7 60

E18 18.0 1 21.7 56.7 60 E36 36.0 2 43.3 72.9 80 E54 54.0 2 65.0 83.7 90 E72 72.0 2 86.6 105.4 110

None - - - 44.7 50

E18 18.0 1 17.3 44.7 50 E36 36.0 2 34.6 58.6 60 E54 54.0 2 52.0 67.2 70 E72 72.0 2 69.3 84.5 90

None - - - 121.4 125

E18 13.5 1 37.5 121.4 125 E36 27.0 2 74.9 131.2 150 E54 40.6 2 112.7 178.4 200 E72 54.1 2 150.2 187.7 200

None - - - 121.4 125

E18 18.0 1 43.3 121.4 125 E36 36.0 2 86.6 145.8 150 E54 54.0 2 129.9 167.4 175 E72 72.0 2 173.2 210.7 225

None - - - 63.5 70

E18 18.0 1 21.7 63.5 70 E36 36.0 2 43.3 72.9 80 E54 54.0 2 65.0 83.7 90 E72 72.0 2 86.6 105.4 110

None - - - 49.9 50

E18 18.0 1 17.3 49.9 50 E36 36.0 2 34.6 58.6 60 E54 54.0 2 52.0 67.2 70 E72 72.0 2 69.3 84.5 90

MCA

(Amps)

Breaker

Size

(Amps)

22 Johnson Controls Unitary Products

Page 23

J15 thru 25 ZJ - High Static Drive With Powered Convenience Outlet (Continued)

Size

(Tons)

Volt

208-3-60 23.0 160 31.5 3.7 38.6 10.0

230-3-60 23.0 160 31.5 3.7 38.6 10.0

J25 (25)

460-3-60 12.2 87 17.1 1.9 19.3 5.0

575-3-60 8.7 62 13.5 1.5 15.4 4.0

Compressors

(each)

RLA LRA MCC FLA FLA FLA Model kW Stages Amps

OD Fan

Motors

(each)

1. Minimum Circuit Ampacity.

2. Dual Element, Time Delay Type.

3. HACR type per NEC.

Supply Blower

Motor

Pwr

Conv

Outlet

Electric Heat Option

None - - - 165.1 200

E18 13.5 1 37.5 165.1 200 E36 27.0 2 74.9 165.1 200 E54 40.6 2 112.7 201.6 225 E72 54.1 2 150.2 210.9 225

None - - - 165.1 200

E18 18.0 1 43.3 165.1 200 E36 36.0 2 86.6 169.0 200 E54 54.0 2 129.9 190.7 225 E72 72.0 2 173.2 234.0 250

None - - - 85.5 100

E18 18.0 1 21.7 85.5 100 E36 36.0 2 43.3 85.5 100 E54 54.0 2 65.0 95.3 110 E72 72.0 2 86.6 117.0 125

None - - - 64.1 70

E18 18.0 1 17.3 64.1 70 E36 36.0 2 34.6 67.6 70 E54 54.0 2 52.0 76.2 90 E72 72.0 2 69.3 93.5 100

MCA

(Amps)

Max Fuse2/

Breaker

Size

(Amps)

349218-JIM-F-0512

Johnson Controls Unitary Products 23

Page 24

349218-JIM-F-0512

J25ZJ - Low Static Drive Without Powered Convenience Outlet

Size

(Tons)

Volt

208-3-60 23.0 160 31.5 3.7 20.0 0.0

230-3-60 23.0 160 31.5 3.7 20.0 0.0

J25 (25)

460-3-60 12.2 87 17.1 1.9 10.0 0.0

575-3-60 8.7 62 13.5 1.5 8.2 0.0

1. Minimum Circuit Ampacity.

2. Dual Element, Time Delay Type.

3. HACR type per NEC.

Compressors

(each)

RLA LRA MCC FLA FLA FLA Model kW Stages Amps

OD Fan

Motors

(each)

Supply Blower

Motor

Pwr

Conv

Outlet

Max Fuse2/

Electric Heat Option

None - - - 132.6 150

E18 13.5 1 37.5 132.6 150 E36 27.0 2 74.9 132.6 150 E54 40.6 2 112.7 165.9 175 E72 54.1 2 150.2 175.2 200

None - - - 132.6 150

E18 18.0 1 43.3 132.6 150 E36 36.0 2 86.6 133.3 150 E54 54.0 2 129.9 154.9 175 E72 72.0 2 173.2 198.2 225

None - - - 69.5 80

E18 18.0 1 21.7 69.5 80 E36 36.0 2 43.3 69.5 80 E54 54.0 2 65.0 77.5 90 E72 72.0 2 86.6 99.1 110

None - - - 51.2 60

E18 18.0 1 17.3 51.2 60 E36 36.0 2 34.6 53.6 60 E54 54.0 2 52.0 62.2 70 E72 72.0 2 69.3 79.5 90

MCA

(Amps)

Breaker

Size

(Amps)

J25ZJ - Low Static Drive With Powered Convenience Outlet

Size

(Tons)

Volt

208-3-60 23.0 160 31.5 3.7 20.0 10.0

230-3-60 23.0 160 31.5 3.7 20.0 10.0

J25 (25)

460-3-60 12.2 87 17.1 1.9 10.0 5.0

575-3-60 8.7 62 13.5 1.5 8.2 4.0

1. Minimum Circuit Ampacity.

2. Dual Element, Time Delay Type.

3. HACR type per NEC.

Compressors

(each)

RLA LRA MCC FLA FLA FLA Model kW Stages Amps

OD Fan

Motors

(each)

Supply Blower

Motor

Pwr

Conv

Outlet

Max Fuse2/

Electric Heat Option

None - - - 142.6 150

E18 13.5 1 37.5 142.6 150 E36 27.0 2 74.9 142.6 150 E54 40.6 2 112.7 178.4 200 E72 54.1 2 150.2 187.7 200

None - - - 142.6 150

E18 18.0 1 43.3 142.6 150 E36 36.0 2 86.6 145.8 150 E54 54.0 2 129.9 167.4 175 E72 72.0 2 173.2 210.7 225

None - - - 74.5 80

E18 18.0 1 21.7 74.5 80 E36 36.0 2 43.3 74.5 80 E54 54.0 2 65.0 83.7 90 E72 72.0 2 86.6 105.4 110

None - - - 55.2 60

E18 18.0 1 17.3 55.2 60 E36 36.0 2 34.6 58.6 60 E54 54.0 2 52.0 67.2 70 E72 72.0 2 69.3 84.5 90

MCA

(Amps)

Breaker

Size

(Amps)

24 Johnson Controls Unitary Products

Page 25

Table 9: J15 thru 25 ZJ Physical Data

349218-JIM-F-0512

Component

Nominal Tonnage 15 17.5 20 25

AHRI COOLING PERFORMANCE

Gross Capacity @ AHRI A point (Btu) 183500 213700 242000 312000 AHRI net capacity (Btu) 178500 206000 235000 295000 EER 12.4 12.0 11.5 10.4 SEER - - - IEER 14.0 13.4 13.0 10.9 Nominal CFM 6000 5800 6200 10000 System power (KW) 14.40 17.10 20.10 28.50 Refrigerant type R-410a R-410a R-410a R-410a Refrigerant charge (lb-oz)

System 1 12-8 12-8 12-0 12-8 System 2 12-8 13-8 12-0 13-8 System 3 12-8 12-8 12-0 13-0 System 4 12-8 12-8 12-0 12-8

AHRI HEATING PERFORMANCE

Heating model 24 32 24 32 24 32 24 32 Heat input (K Btu) 300 400 300 400 300 400 300 400 Heat output (K Btu) 240 320 240 320 240 320 240 320 AFUE% ------- Steady state efficiency (%) 80 80 80 80 80 80 80 80 No. burners 6868686 8 No. stages 2222222 2 Temperature Rise Range (ºF) 20-50 30-60 20-50 30-60 20-50 30-60 20-50 30-60 Gas Limit Setting (ºF) 195 195 195 195 195 195 195 195 Gas piping connection (in.) 1111111 1

DIMENSIONS (inches)

Length 180-19/32 Width 92 Height 52-5/8

OPERATING WT. (lbs.) 2609 2665 2697 2783

COMPRESSORS

Type Scroll Scroll Scroll Scroll Quantity 4 4 4 4 Unit Capacity Steps (%) 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100 25 / 50 / 75 / 100

CONDENSER COIL DATA

Face area (Sq. Ft.) 63.8 63.8 63.8 63.8 Rows 2 2 2 2 Fins per inch 20 20 20 20 Tube diameter (in.) 3/8 3/8 3/8 3/8 Circuitry Type Split-face Split-face Split-face Split-face

EVAPORATOR COIL DATA

Face area (Sq. Ft.) 25 25 25 25 Rows 4 4 4 4 Fins per inch 13.5 13.5 13.5 13.5 Tube diameter 3/8 3/8 3/8 3/8 Circuitry Type Split-face Split-face Split-face Split-face Refrigerant control TXV TXV TXV TXV

J15ZJ J18ZJ J20ZJ J25ZJ

Models

Johnson Controls Unitary Products 25

Page 26

349218-JIM-F-0512

Table 9: J15 thru 25 ZJ Physical Data (Continued)

Component

Nominal Tonnage 15 17.5 20 25

CONDENSER FAN DATA

Quantity 4 4 4 4 Fan diameter (Inch) 24 24 30 30 Type Prop Prop Prop Prop Drive type Direct Direct Direct Direct No. speeds 1 1 1 1 Number of motors 4 4 4 4 Motor HP each 1/3 1/3 1/3 1/3 RPM 850 850 870 870 Nominal total CFM 4000 4000 5000 5000

BELT DRIVE EVAP FAN DATA

Quantity 1 1 1 1 Fan Size (Inch) 15 X 15 18 X 15 18 X 15 18 X 15 Type Centrifugal Centrifugal Centrifugal Centrifugal Motor Sheave 1VP65 1VP65 1VP60 1VP60 1VP60 1VP60 1VP60 1VP75X 1VP75X Blower Sheave BK110 BK090 BK110 BK090 BK110 BK090 1B5V94 1B5V110 1B5V94 Belt BX85 BX81 BX78 BX75 BX78 BX75 BX78 5VX840 5VX860 Motor HP each 5 5 5 7.5 5 7.5 7.5 10 15 RPM 1725 1725 1725 1725 1725 1725 1725 1725 1725 Frame size 184T 184T 184T 213T 184T 213T 213T 215T 254T

FILTERS

Quantity - Size

1. 2 In. Throwaway, Standard, MERV (Minimum Efficiency Reporting Value) 3.

2. 2 In. Pleated, Optional, MERV 7.

3. 4 In. Pleated, Optional, MERV 13.

J15ZJ J18ZJ J20ZJ J25ZJ

12 - (12 x 24 x 2)

2 - (20 x 24 x 4),

4 - (24 x 24 x 4)

1,2

12 - (12 x 24 x 2)

2 - (20 x 24 x 4),

4 - (24 x 24 x 4)

Models

1,2

12 - (12 x 24 x 2)

2 - (20 x 24 x 4),

4 - (24 x 24 x 4)

1,2

12 - (12 x 24 x 2)

2 - (20 x 24 x 4), 4 - (24 x 24 x 4)

1,2

Optional Electric Heat

The factory-installed heaters are wired for single point power supply. Power supply need only be brought into the single point terminal block.

Table 10: Electric Heat Minimum Supply Air

Size

(Tons)

J15ZJ

(15)

J18ZJ (17.5)

J20ZJ

(20)

J25ZJ

(25)

Voltage

9185472

208/230-3-60 4500 4500 5000 5000

460-3-60 4500 4500 5000 4500 600-3-60 4500 4500 4500 4500

208/230-3-60 6000 6000 6000 6000

460-3-60 6000 6000 6000 6000 600-3-60 6000 6000 6000 6000

208/230-3-60 6000 6000 6000 6000

460-3-60 6000 6000 6000 6000 600-3-60 6000 6000 6000 6000

208/230-3-60 7500 7500 7500 7500

460-3-60 7500 7500 7500 7500 600-3-60 7500 7500 7500 7500

Minimum Supply Air (CFM)

These CSA approved heaters are located within the central compartment of the unit with the heater elements extending in to the supply air chamber.

Fuses are supplied, where required, by the factory. Some kW sizes require fuses and others do not. refer to Table 10 for minimum CFM limitations and to Table 8 for electrical data.

Heater kW

26 Johnson Controls Unitary Products

Page 27

Optional Gas Heat

These gas-fired heaters have aluminized-steel or optional stainless steel, tubular heat exchangers with spark ignition with proven pilot.

Table 11: Gas Application Data

Unit

Size Opt.

J15ZJ

J18ZJ

J20ZJ

J25ZJ

1. On VAV units, individual VAV boxes must be full open in heating mode to insure airflow falls within temperature rise range.

24 300 240 20-50 32 400 320 30-60 24 300 240 20-50 32 400 320 30-60 24 300 240 20-50 32 400 320 30-60 24 300 240 20-50 32 400 320 30-60

Gas Piping

Proper sizing of gas piping depends on the cubic feet per hour of gas flow required, specific gravity of the gas and the length of run. “National Fuel Gas Code” Z223.1 (in U.S.A.) or the current Gas Installation Codes CSA-B149.1 (in Canada) should be followed in all cases unless superseded by local codes or gas utility requirements. Refer to the Pipe Sizing Table 12. The heating value of the gas may differ with locality. The value should be checked with the local gas utility.

NOTE: There may be a local gas utility requirement specifying

a minimum diameter for gas piping. All units require a one-inch pipe connection at the entrance fitting.

Input

(MBH)

Output (MBH)

Temp Rise

(°F)

349218-JIM-F-0512

Main

Manual

Shut-off

Valve

Drip Leg

Figure 14: Bottom Supply Connection External Shut-Off Table 12: Gas Pipe Sizing - CapacIty of Pipe

Length of

Pipe (ft.)

10 520 1050 20 350 730 30 285 590 40 245 500 50 215 440 60 195 400 70 180 370 80 170 350 90 160 320

100 150 305

Nominal Iron Pipe Size

1 in. 1-1/4 in.

NOTE: Maximum capacity of pipe in cubic feet of gas per hour

based upon a pressure drop of 0.3 inch W.C. and 0.6 specific gravity gas.

Main

Manual

Shut-off

Valve

Drip Leg

Figure 13: External Supply Connection External Shut-Off

Table 13: Gas Heat Minimum Supply Air

Size

(Tons)

J15ZJ

(15)

J18ZJ

(17.5)

J20ZJ

(20)

J25ZJ

(25)

Heat Size

Min Max Min Max

24 4500 7000 4500 7000 32 4500 7000 4500 7000 24 6000 8750 6000 8750 32 6000 8750 6000 8750 24 6000 9400 6000 9400 32 6000 9400 6000 9400 24 7500 12500 7500 12500 32 7500 12500 7500 12500

Supply Air (CFM)

Cooling Heating

Johnson Controls Unitary Products 27

Page 28

349218-JIM-F-0512

Gas Connection

The gas supply line can be routed within the space and roof curb, exiting through the unit’s basepan. Refer to Figure 5 for the gas piping inlet location. Typical supply piping arrangements are shown in Figures 13 and 14. All pipe nipples, fittings, and the gas cock are field supplied.

Gas piping recommendations:

1. A drip leg and a ground joint union must be installed in the gas piping.

2. Where required by local codes, a manual shut-off valve must be installed outside of the unit.

3. Use wrought iron or steel pipe for all gas lines. Pipe dope should be applied sparingly to male threads only.

The furnace and its individual shut-off valve must be disconnected from the gas supply piping system during any pressure testing at pressures in excess of 1/2 PSIG.

Pressures greater than 1/2 PSIG will cause gas valve damage resulting in a hazardous condition. If it is subjected to a pressure greater than 1/2 PSIG, the gas valve must be replaced.

Natural gas may contain some propane. Propane is an excellent solvent and will quickly dissolve white lead and most standard commercial compounds. A special pipe dope must be used when assembling wrought iron or steel pipe. Shellac based compounds such as Gaskolac or Stalastic, and compounds such as Rectorseal #5, Clydes’s or John Crane may be used.

4. All piping should be cleaned of dirt and scale by hammering on the outside of the pipe and blowing out loose particles. Before initial start-up, be sure that all gas lines external to the unit have been purged of air.

5. The gas supply should be a separate line and installed in accordance with all safety codes as prescribed under “Limitations”.

6. A 1/8-inch NPT plugged tapping, accessible for test gage connection, must be installed immediately upstream of the gas supply connection to the unit.

7. After the gas connections have been completed, open the main shut-off valve admitting normal gas pressure to the mains. Check all joints for leaks with soap solution or other material suitable for the purpose. NEVER USE A FLAME.

FIRE OR EXPLOSION HAZARD Failure to follow the safety warning exactly could result

in serious injury, death or property damage. Never test for gas leaks with an open flame. use a

commercially available soap solution made specifically for the detection of leaks to check all connections. A fire or explosion may result causing property damage, personal injury or loss of life.

Threaded joints should be coated with a sealing compound that is resistant to the action of liquefied petroleum gases. Do not use Teflon tape.

Lp Units, Tanks And Piping

All gas heat units are shipped from the factory equipped for natural gas use only. The unit may be converted in the field for use with LP gas with accessory kit model number 1NP0418.

All LP gas equipment must conform to the safety standards of the National Fire Protection Association.

For satisfactory operation, LP gas pressure must be 10.0 inch W.C. at the unit under full load. Maintaining proper gas pressure depends on three main factors:

1. The vaporization rate which depends on the temperature of the liquid and the “wetted surface” area of the container(s).

2. The proper pressure regulation. (Two-stage regulation is recommended).

3. The pressure drop in the lines between regulators and between the second stage regulator and the appliance. Pipe size required will depend on the length of the pipe run and the total load of all appliances.

Complete information regarding tank sizing for vaporization, recommended regulator settings, and pipe sizing is available from most regulator manufacturers and LP gas suppliers.

LP gas is an excellent solvent and will quickly dissolve white lead and most standard commercial compounds. A special pipe dope must be used when assembling wrought iron or steel pipe for LP. Shellac base compounds such as Gaskolac or Stalastic, and compounds such as Rectorseal #5, Clyde’s, or John Crane may be used.

28 Johnson Controls Unitary Products

Page 29

349218-JIM-F-0512

Check all connections for leaks when piping is completed using a soap solution. NEVER USE A FLAME.

FIRE OR EXPLOSION HAZARD Failure to follow the safety warning exactly could result

in serious injury, death or property damage. Never test for gas leaks with an open flame. use a

commercially available soap solution made specifically for the detection of leaks to check all connections. A fire or explosion may result causing property damage, personal injury or loss of life.

Vent And Combustion Air

Two vent hoods and a combustion air hood (with screens) are shipped attached to the blower housing in the blower compartment. For units with factory installed VFD option, the hoods and accompanying hardware are shipped inside the gas heat section. These hoods must be installed to assure proper unit function. All hoods must be fastened to the outside of the gas heat access panel with the screws provided in the bag also attached to the blower housing.

The screen for the combustion air intake hood is secured to the inside of the access panel opening with four fasteners and the screws used for mounting the hood to the panel. The top flange of this hood slips in under the top of the access panel opening when installing. Refer to Vent and Combustion Air Hood Figure 15.

Options/Accessories

Electric Heat

Electric heaters are available as a factory-installed option. These heaters mount in the heat compartment with the heating elements extending into the supply air chamber. All electric heaters are fused and intended for use with single point power supply.

Economizer/Motorized Outdoor Damper Rain Hood

The instruction for the optional economizer/motorized damper rain hood can be found in the rain hood kit. Use these instructions when field assembling an economizer rain hood onto a unit. The outdoor and return air dampers, the damper actuator, the damper linkage, the outdoor and return air divider baffles, and all the control sensors are factory mounted as part of the “Factory installed” economizer option.

Power Exhaust/Barometric Relief Damper and Rain Hood

The instructions for the power exhaust/barometric relief damper and rain hood can be found in the rain hood kit. The exhaust fan, all supporting brackets, angles, and the wiring are factory installed as part of the power exhaust option.

Economizer And Power Exhaust Set Point Adjustments

Remove the top rear access panel from the unit. Locate the economizer control module, where the following adjustments will be made.

Each vent hood is installed by inserting the top flange of the hood into the slotted opening in the access panel and securing in place.

The products of combustion are discharged horizontally through these two screened, hooded vent openings on the upper gas heat access panel.

Slotted Openings in

Vent Air

Outlet Hoods

Combustion Air

Intake Hood

Access Panel

Gas Heat

Access Panels

Figure 15: Vent and Combustion Air Hood

Extreme care must be exercised in turning all set point, maximum and minimum damper positioning adjustment screws to prevent twisting them off.

Minimum Position Adjustment

• Check that the damper blades move smoothly without binding; carefully turn the Minimum Position Adjust screw (found on the damper control module) fully clockwise and then set the thermostat indoor fan switch to the ON position and then OFF or energize and de-energize terminals “R” to “G”.

• With the thermostat set to the indoor fan ON position or terminals “R” to “G” energized, turn the Minimum Position Adjusting screw (located on the damper control module) counterclockwise until the desired minimum damper position has been attained.

Enthalpy Set Point Adjustment

• The enthalpy set point may now be set by selecting the desired set point shown in the Enthalpy Set Point Adjustment Figure 16. Adjust as follows:

• For a single enthalpy operation carefully turn the set point adjusting screw (found on the damper control

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349218-JIM-F-0512

module) to the “A”, “B”, “C” or “D” setting corresponding to the lettered curve of the Enthalpy Set Point Adjustment Figure 17.

• For a dual enthalpy operation, carefully turn the set point adjusting screw fully clockwise past the "D" setting.

Power Exhaust Damper Set Point

With power exhaust option, each building pressurization requirement will be different. The point at which the power exhaust comes on is determined by the economizer damper position (Percent Open). The Exhaust Air Adjustment Screw should be set at the Percent Open of the economizer damper at which the power exhaust is needed. It can be set from 0 to 100% damper open.

Indoor Air Quality AQ

Indoor Air Quality (indoor sensor input): Terminal AQ accepts a +2 to +10 Vdc signal with respect to the (AQ1) terminal. When the signal is below it's set point, the actuator is allowed to modulate normally in accordance with the enthalpy and mixed air sensor inputs. When the AQ signal exceeds it's set point setting and there is no call for free cooling, the actuator is proportionately modulated from the 2 to 10 Vdc signal, with 2 Vdc corresponding to full closed and 10 Vdc corresponding to full open. When there is no call for free cooling, the damper position is limited by the IAQ Max damper position setting. When the signal exceeds it's set point (Demand Control Ventilation Set Point) setting and there is a call for free cooling, the actuator modulates from the minimum position to the full open position based on the highest call from either the mixed air sensor input or the AQ voltage input.

• Optional CO

Space Sensor Kit Part # 2AQ04700324

Sensor Kit Part # 2AQ04700424

Replace the top rear access panel on the unit.

Optional BAS-Ready Economizer Power Exhaust Damper Set Point Adjustment

reference signal to the VFD to control the output of the indoor blower motor.

Duct Static Pressure Transducer

A 0-5" WC pressure transducer, located in the control box compartment, is used to sense static (gauge) pressure in the supply air duct and convert this pressure measurement to a proportional 0-5 VDC electrical output.

Pressure-transmitting plastic tubing (1/4" diameter) must be field supplied and installed from the transducer to both the ductwork and to the atmosphere. Connect the tubing from the 'HIGH' pressure tap of the transducer to a static pressure tap (field supplied) in the supply duct located at a point where constant pressure is expected. To prevent an unstable signal due to air turbulence, there should be no obstructions, turns or VAV terminal boxes up- or down-stream of the sensing tube location for at least a distance of 6-10 times the duct diameter. Tubing must also be run between the 'LOW' pressure tap of the transducer and atmospheric pressure (outside of the unit).

Do not run plastic tubing in the supply or return air ducts as air movement could cause erroneous pressure measurements. If the tubing penetrates through the bottom of the unit be sure openings are sealed to prevent air and water leakage.

Vav Control Board

A VAV control board, located in the top-left corner of the control box, is used to convert the pressure transducer input signal into a speed reference signal that the drive uses to control the speed of the blower motor. This modulating speed reference signal is generated using an internal algorithm which continuously calculates an output value.

Remove the economizer access panel from the unit. Loosen, but do not remove the two panel latches. Locate the economizer actuator, where the following adjustment can be made.

With power exhaust option, each building pressurization requirement will be different. The point at which the power exhaust comes on is determined by the economizer's outdoor damper position. The actuator's auxiliary switch adjustment screw should be set at the damper position at which the power exhaust is needed. The adjustment screw can be set between 25 to 85 degrees open.

Replace the economizer access panel.

Optional Variable Air Volume (VAV)

A variable air volume (VAV) option using a variable frequency drive (VFD) is available for applications requiring a constant supply duct static pressure. A differential pressure transducer is

A brief description of the VAV board's I/O terminals that are used follows:

Inputs:

• DUCT PRES - a 0-5 VDC analog input provided by a factory-installed duct static pressure transducer located in the unit's control box.

• SAT - analog input provided by a factory-installed 10k-ohm, type 3 thermistor located in the unit's supply air compartment.

• RAT - analog input provided by a factory-installed 10k-ohm, type 3 thermistor located in the unit's return air compartment.

• OAT - analog input provided by a factory-installed 10k-ohm, type 3 thermistor located in the outdoor air compartment or mounted within the evaporator base rail for units without the installed economizer option.

• ST - analog input provided by field-installed space temperature sensor.

used to monitor supply duct static pressure and return a speed

30 Johnson Controls Unitary Products

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349218-JIM-F-0512

• OH - a 0-10 VDC analog input provided by a field-installed outdoor air relative humidity sensor for single enthalpy economizer configuration.

• RH - a 0-10 VDC analog input provided by a field-installed return air relative humidity sensor for dual enthalpy economizer configuration (used with OH).

• IAQ - a 0-10 VDC analog input provided by a field-installed carbon dioxide sensor which monitors indoor air quality (CO2 concentration) and enables call for Demand Ventilation mode for units installed with economizer option.

• OAQ - a 0-10 VDC analog input provided by a fieldinstalled carbon dioxide sensor which monitors outdoor air quality (CO2 concentration) and, along with IAQ, enables call for Differential Demand Ventilation mode for units installed with economizer option.

• APS - a 24 VAC binary input provided by a field-installed air proving switch which monitors the pressure difference across the indoor blower.

• PUR - a 24 VAC binary input for building purge calls from an external source.

• OCC - a 24 VAC binary input used to set the building occupancy status for the control.

• LIMIT 2 - a 24 VAC binary input which either confirms 2nd-stage gas heat operation or receives an error signal from the variable frequency drive.

Outputs:

• FAN - a 2-10 VDC analog output signal sent to the VFD to modulate the speed of the indoor blower motor.

• ECON - a 2-10 VDC analog output signal sent to the economizer actuator to modulate position of the return air and outdoor air dampers (optional).

• EXH ~ - a 24 VAC binary output signal used to turn on/off the power exhaust relay (optional).

• VAV BOX (gas/electric heat only) - a normally open relay contact connected to a terminal block, used to drive the building's VAV boxes to full-open during heating operation.

Programmable set points: The duct static set point is the pressure that the drive will

maintain when operating the unit in VAV mode. The set-point is adjustable between 0" WC and 5" WC with the default setting of

1.5" WC. The duct static high-limit set point is the maximum allowable

duct pressure to prevent damage from over-pressurization of the ductwork in the event of either a drive or damper failure. The high-limit set-point is adjustable between 0" WC and 5" WC with the factory default setting of 4.5" WC. If the duct static pressure reaches the high-limit set point, then the supply fan motor will be shutdown.

NOTE: Either of the set points described above can be

changed through the unit control board (UCB) with the use of a USB-to-RS485 converter, personal computer or PDA and a down-loaded copy of the Simplicity® software available at the UPGnet Commercial Product Catalog website.

The customer must be aware of the duct pressure design limit, and what the duct pressure sensor is reading when the peak pressure is reached (i.e. the pressure transducer sensing tube may not be located at the place of highest pressure in the system).

Factory-installed VFD

The factory-installed VFD is mounted in the Blower Access Compartment above the blower assembly. The drive comes wired from the factory to include both 3-phase power and control connections (run permit signal, speed reference signal & fault signal).

All required drive parameters are pre-programmed at the factory, except in the case of 208-volt applications, in which the parameter that defines motor nameplate voltage must be changed to a value of 208.00 and the parameter that defines motor-rated current must be changed to the appropriate value appearing on the motor's nameplate. Refer to the enclosed drive material or access the UPGnet Commercial Product Catalog website for instructions on changing parameter settings.

For units also equipped with gas/electric heat, a terminal block located in the unit's control box and connected to the VAV board's "VAV BOX" terminal, must be field wired to the building's VAV boxes to ensure fully open dampers during heating operation.

Manual Bypass

An optional, factory-installed manual bypass switch available with factory-installed VFD can be found in the Blower Motor Access compartment and has the following three positions:

• DRIVE - routes power through the VFD for modulating control of the indoor blower motor.

• LINE (or BYPASS) - routes power directly to the motor which provides full-speed motor operation and complete electrical isolation of the drive.

• TEST - routes power to the VFD but not to the motor to allow for drive programming and/or diagnostics.

If a drive failure occurs, the unit does not automatically switch to bypass mode. The LINE/DRIVE/TEST switch must be manually switched to the LINE (BYPASS) position. If there is a call for the fan, the indoor blower motor will run at full-speed while in the bypass mode.

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If the unit is operated with the manual bypass switch in the LINE (BYPASS) position and there are VAV boxes present in the duct system, then boxes must be driven to the full-open position using a customer-supplied power source to prevent over-pressurizing and possible damage to the ductwork.

'VFD-Ready' For Customer-installation

Units configured as 'VFD-ready' provide provisions for a customer-installed drive. The physical dimensions of VFDs can vary greatly among manufacturers, horsepower ratings and voltage requirements. Keep in mind that drive manufacturers also require various minimum clearances to allow for adequate internal cooling of the drive during operation.

The unit comes with a mounting bracket installed in the Blower Access compartment which may accommodate other vendor's drives depending on their size. In order to utilize the unit's mounting bracket, the maximum recommended drive dimensions are as follows:

Before beginning any service, disconnect all power to the drive. Be aware that high voltages are present in the drive even after power has been disconnected. Capacitors within the drive must be allowed to discharge before beginning service.

BAS-Ready VFD

Factory-installed VFD is also available with 'BAS-ready' models. Terminal blocks are provided in the control box (in place of the VAV control board) for field wiring of a customerinstalled BAS to receive 24 VAC power and to connect to the following control signals:

• a duct static pressure transducer input signal (0-5 VDC)

• an economizer actuator input signal (2-10 VDC)

• an economizer actuator output signal (2-10 VDC)

• a VFD speed reference output signal (2-10 VDC)

The use of shielded cable is recommended for the above control wiring connections.

NOTE: Factory-installed VFD is not available with factory-

installed BAS options due to space limitations in the control box.

A solid-state, lock-out relay (LR) and 100must be field-supplied and installed to provide a means to transmit a potential fault signal back to the BAS controller. The specific relay part number required will depend upon the need for either AC-output or DC-output. See price pages for further details.

F, 50 VDC capacitor

For 5-hp motor applications....................... 13" H x 6" W x 7" D

For 7.5 thru 15-hp motor applications........ 13" H x 8" W x 8" D

If the drive will not fit in the allotted space, then it will need to be mounted elsewhere; either within the building on a perpendicular wall which is not subjected to excessive temperature, vibration, humidity, dust, corrosive gas, explosive gas, etc., or within an appropriate enclosure rated for outside installation to safeguard against moisture, dust and excessive heat.

The power leads to the drive (L1, L2, L3) and from the motor (T1, T2, T3) along with the respective ground wires are supplied with the unit and need to be connected after the drive is installed.

Do not connect AC power to the T1, T2, T3 drive terminals to prevent damage to the VFD.

A terminal block located in the control box is provided for field connection of the VFD speed reference signal (2-10 VDC) and to the normally-open, run-permit auxiliary contact. The use of shielded cable is recommended for the above control wiring connections.

For VFD-ready units also equipped with gas/electric heat, a terminal block located in the unit's control box and connected to the VAV board's "VAV BOX" terminal, must be field wired to the building's VAV boxes to ensure fully open dampers during heating operation.

Once the appropriate relay and capacitor are obtained, install the capacitor across LR terminals '3' & '4' and make the following wiring connections:

• LR '1' to BAS controller

• LR '2' to BAS controller

• LR '3' to UCB 'X'

• LR '4' to UCB 'C'

32 Johnson Controls Unitary Products

Optional Hot Gas Bypass (HGBP)

To allow for low cooling load operation, a direct-acting, pressure-modulating bypass control valve installed on the system #1 discharge line is used to divert high temperature, high pressure refrigerant around the TXV in order to maintain a desired minimum evaporator pressure.

The opening pressure of the bypass valve is fully adjustable between 0 and 80 psig with a factory-setting of 60 psig. HGBP is standard on all units with VAV and optional with CV units.

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Figure 16: Enthalpy Set Point Chart

CONTROL

CURVE

CONTROL POINT

F (0C)

APPROX.

AT 50% RH

73 (23)

70 (21) 67 (19)

63 (17)

(18)

(16)

(13)

(10)

45 (7)

40 (4)

(2)

(4)45(7)

(10)55(13)

(16)

(18)

(21)

(24)

(24)80(27)

(27)

APPROXIMATE DRY BULB TEMPERATURE - 0F (0C)

(29)

(32)

(35)

105

(43)

(38)

(41)

105

110

100

(41)

(43)

(38)

110

100

Exhaust Air Adjustment

Screw

Exhaust Air LED

Damper Min.

Position

Screw

Indoor Air Quality

Max. Adjustment

Screw

Indoor Air Quality

LED

Indoor Air Quality

Min. Adjustment

Screw

Free Cooling LED

Economizer Enthalpy Set Point Adjustment

Screw

AQ1 AQ

SO+ SO

SR+

Pos

Max

Free Cool

Figure 17: Economizer Control (Excludes VFD and BAS Options)

EXH

Set

EXH

Min

IAQ

IAQ Min

TR TR1

Vac

HOT

EF EF1

Vac

COM

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Phasing

Johnson Controls Model J**ZJ units are properly phased at the factory. Check for proper compressor rotation. If the blower or compressors rotate in the wrong direction at start-up, the electrical connection to the unit is misphased. Change the phasing of the Field Line Connection at the factory or field supplied disconnect to obtain proper rotation. (Scroll compressors operate in only one direction. If the scroll is drawing low amperage, has similar suction and discharge pressures, or producing a high noise level, the scroll is misphased.)

Scroll compressors require proper rotation to operate correctly. Units are properly phased at the factory. Do not change the internal wiring to make the blower condenser fans, or compressor rotate correctly.

Blower Rotation

Procedure for adjusting belt tension:

1. Loosen six nuts (top and bottom) A.

2. Adjust by turning (B).

3. Never loosen nuts (C).

4. Use belt tension checker to apply a perpendicular

force to one belt at the midpoint of the span as shown. Deflection distance of 4mm (5/32”) is obtained.

To determine the deflection distance from normal position, use a straight edge from sheave to sheave as reference line. The recommended deflection force is as follows:

Tension new belts at the max. deflection force recommended for the belt section. Check the belt tension at least two times during the first 24 hours of operation. Any retensioning should fall between the min. and max. deflection force values.

5. After adjusting retighten nuts (A).

Check for proper supply air blower rotation. If the blower is rotating backwards, the line voltage at the unit point of power connection is misphased (See ‘PHASING’).

Belt Tension

The tension on the belt should be adjusted as shown in Figure 18.

Span Length

Defl Force

(B)

*Never Loosen

(A)

(C)*

Figure 18: Belt Adjustment

CFM Static Pressure and Power-Altitude and Temperature Corrections

The information below should be used to assist in application of product when being applied at altitudes at or exceeding 1000 feet above sea level.

The air flow rates listed in the standard blower performance tables are based on standard air at sea level. As the altitude or temperature increases, the density of air decreases. In order to use the indoor blower tables for high altitude applications, certain corrections are necessary.

A centrifugal fan is a “constant volume” device. This means that, if the rpm remains constant, the CFM delivered is the same regardless of the density of the air. However, since the air at high altitude is less dense, less static pressure will be generated and less power will be required than a similar application at sea level. Air density correction factors are shown in Table 14 and Figure 19.

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Table 14: Altitude/Temperature Correction Factors

Air

Temp.

40 1.060 1.022 0.986 0.950 0.916 0.882 0.849 0.818 0.788 0.758 0.729 50 1.039 1.002 0.966 0.931 0.898 0.864 0.832 0.802 0.772 0.743 0.715 60 1.019 0.982 0.948 0.913 0.880 0.848 0.816 0.787 0.757 0.729 0.701 70 1.000 0.964 0.930 0.896 0.864 0.832 0.801 0.772 0.743 0.715 0.688 80 0.982 0.947 0.913 0.880 0.848 0.817 0.787 0.758 0.730 0.702 0.676 90 0.964 0.929 0.897 0.864 0.833 0.802 0.772 0.744 0.716 0.689 0.663

100 0.946 0.912 0.880 0.848 0.817 0.787 0.758 0.730 0.703 0.676 0.651

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

1.100

1.050

1.000

0.950

0.900

0.850

0.800

Correction Factor

0.750

0.700

0.650

Altitude (Ft.)

Sea Level

1000 ft

2000 ft

3000 ft

4000 ft

5000 ft

6000 ft

7000 ft

8000 ft

9000 ft

10000 ft

0.600

40 50 60 70 80 90 100

Air Temperature (ºF)

Figure 19: Altitude/Temperature Correction Factors

The examples below will assist in determining the airflow performance of the product at altitude.

Example 1: What are the corrected CFM, static pressure, and BHP at an elevation of 5,000 ft. if the blower performance data is 6,000 CFM, 1.5 IWC and 4.0 BHP?

Solution: At an elevation of 5,000 ft. the indoor blower will still deliver 6,000 CFM if the rpm is unchanged. However, Table 14 must be used to determine the static pressure and BHP. Since no temperature data is given, we will assume an air temperature of 70°F. Table 14 shows the correction factor to be 0.832.

Corrected static pressure = 1.5 x 0.832 = 1.248 IWC Corrected BHP = 4.0 x 0.832 = 3.328

Example 2: A system, located at 5,000 feet of elevation, is to deliver 6,000 CFM at a static pressure of 1.5". Use the unit

blower tables to select the blower speed and the BHP requirement.

Solution: As in the example above, no temperature information is given so 70°F is assumed.

The 1.5" static pressure given is at an elevation of 5,000 ft. The first step is to convert this static pressure to equivalent sea level conditions.

Sea level static pressure = 1.5 / .832 = 1.80"

Enter the blower table at 6000 sCFM and static pressure of

1.8". The rpm listed will be the same rpm needed at 5,000 ft. Suppose that the corresponding BHP listed in the table is 3.2.

This value must be corrected for elevation.

BHP at 5,000 ft. = 3.2 x .832 = 2.66

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Drive Selection

1. Determine side or bottom supply duct application.

2. Determine desired airflow

3. Calculate or measure the amount of external static pressure.

4. Using the operating point determined from steps 1, 2 & 3, locate this point on the appropriate supply air blower performance table. (Linear interpolation may be necessary.)

5. Noting the RPM and BHP from step 4, locate the appropriate motor and/or drive on the RPM selection table.

6. Review the BHP compared to the motor options available. Select the appropriate motor and/or drive.

7. Review the RPM range for the motor options available. Select the appropriate drive if multiple drives are available for the chosen motor.

8. Determine turns open to obtain the desired operation point.

Example

1. 6800 CFM

2. 2.0 iwg

3. Using the supply air blower performance table below, the following data point was located: 1020 RPM & 5.92 BHP.

4. Using the RPM selection table below, Size X and Model Y is found.

5. 5.92 BHP exceeds the maximum continuous BHP rating of the 5.0 HP motor. The 7.5 HP motor is required.

6. 1020 RPM is within the range of the 7.5 HP drives.

7. Using the 7.5 HP motor and drive, 3.5 turns open will achieve 1020 RPM.

Example Supply Air Blower Performance

Air Flow

(CFM)

6400 719 2.55 756 3.03 792 3.49 828 3.92 864 4.32 899 4.67 933 4.98 966 5.24 998 5.45 1028 5.59 1056 5.67 1083 5.68 6800 742 3.02 778 3.51 814 3.97 850 4.40 886 4.79 921 5.15 955 5.46 988 5.72 1020 5.92 1050 6.07 1078 6.15 1105 6.16 7200 765 3.54 802 4.03 838 4.49 874 4.92 910 5.32 945 5.67 979 5.98 1012 6.24 1044 6.44 1074 6.59 1102 6.67 1129 6.68 7600 790 4.11 827 4.60 863 5.06 899 5.49 935 5.88 970 6.24 1004 6.55 1037 6.81 1069 7.01 1099 7.16 1127 7.24 1154 7.25

0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Standard

5 HP & Field

Supplied

Drive

Standard 5 HP & Drive High Static 7.5 HP & Drive

Available External Static Pressure - IWG

7.5 HP & Field Supplied Drive

Table X: RPM Selection

Size

(Tons)

Model HP

5 5.75 1VP60 BK110 730 765 800 835 870 905 N/A

7.5 8.63 1VP60 BK090 905 950 990 1035 1075 1120 N/A

Max

BHP

Motor

Sheave

Blower

Sheave

6 Turns

Open

5 Turns

Open

4 Turns

Open

3 Turns

Open

2 Turns

Open

1 Turn

Open

Closed

Fully

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Table 15: Air Flow Performance - Side Duct Application J15ZJ (15 Ton) Side Duct

Air Flow

(CFM)

4000 727 1.14 765 1.47 806 1.77 848 2.04 891 2.29 934 2.52 977 2.73 1020 2.93 1061 3.12 1101 3.30 1138 3.48 1174 3.67 4400 753 1.51 792 1.84 832 2.14 874 2.41 917 2.66 960 2.88 1004 3.09 1046 3.29 1087 3.48 1127 3.67 1165 3.85 1200 4.03 4800 781 1.92 820 2.25 861 2.55 903 2.82 946 3.06 989 3.29 1032 3.50 1074 3.70 1116 3.89 1155 4.08 1193 4.26 1228 4.44 5200 812 2.37 850 2.70 891 3.00 933 3.27 976 3.52 1019 3.74 1062 3.95 1105 4.15 1146 4.34 1186 4.53 1223 4.71 1259 4.89 5600 844 2.86 882 3.19 923 3.49 965 3.76 1008 4.01 1051 4.23 1094 4.45 1137 4.64 1178 4.83 1218 5.02 1255 5.20 1291 5.39 6000 877 3.39 916 3.72 957 4.02 999 4.29 1042 4.54 1085 4.76 1128 4.98 1170 5.17 1212 5.36 1251 5.55 1289 5.73 - 6400 912 3.96 951 4.29 992 4.59 1034 4.86 1077 5.10 1120 5.33 1163 5.54 1205 5.74 - - - - - - - 6800 949 4.56 988 4.89 1028 5.19 1070 5.46 1113 5.71 -------------7200 986 5.20 1025 5.53 - - - - - - --------------

0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Standard 5 HP & Field Supplied Drive Standard 5 HP & Drive High Static 5 HP & Drive

Available External Static Pressure - IWG

1. Blower performance includes gas heat exchangers and 2” filters. See STATIC RESISTANCE table for additional applications.

2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.

3. kW = BHP x 0.898.

5 HP & Field Supplied Drive

J18ZJ (17.5 Ton) Side Duct

Air Flow

(CFM)

4400 636 0.65 672 1.14 709 1.60 745 2.03 780 2.43 815 2.78 849 3.09 882 3.35 914 3.55 944 3.70 973 3.78 999 3.79 4800 649 0.99 685 1.48 721 1.94 757 2.37 793 2.77 828 3.12 862 3.43 895 3.69 927 3.89 957 4.04 985 4.12 1012 4.13 5200 663 1.34 700 1.83 736 2.29 772 2.72 808 3.11 843 3.47 877 3.78 910 4.04 942 4.24 972 4.39 1000 4.47 1027 4.48 5600 680 1.71 717 2.20 753 2.66 789 3.09 825 3.48 860 3.84 894 4.15 927 4.41 959 4.61 989 4.76 1017 4.84 1044 4.85 6000 699 2.11 735 2.60 772 3.06 808 3.49 844 3.88 879 4.24 913 4.55 946 4.80 977 5.01 1007 5.15 1036 5.24 1062 5.25 6400 719 2.55 756 3.03 792 3.49 828 3.92 864 4.32 899 4.67 933 4.98 966 5.24 998 5.45 1028 5.59 1056 5.67 1083 5.68 6800 742 3.02 778 3.51 814 3.97 850 4.40 886 4.79 921 5.15 955 5.46 988 5.72 1020 5.92 1050 6.07 1078 6.15 1105 6.16 7200 765 3.54 802 4.03 838 4.49 874 4.92 910 5.32 945 5.67 979 5.98 1012 6.24 1044 6.44 1074 6.59 1102 6.67 1129 6.68 7600 790 4.11 827 4.60 863 5.06 899 5.49 935 5.88 970 6.24 1004 6.55 1037 6.81 1069 7.01 1099 7.16 1127 7.24 1154 7.25 8000 817 4.72 853 5.21 890 5.67 926 6.10 962 6.50 997 6.85 1031 7.16 1064 7.42 1095 7.62 1125 7.77 1154 7.85 1180 7.86 8400 845 5.38 881 5.87 918 6.33 954 6.76 990 7.16 1025 7.51 1059 7.82 1092 8.08 1123 8.28 1153 8.43 1182 8.51 1208 8.52 8800 874 6.09 911 6.58 947 7.04 983 7.47 1019 7.86 1054 8.22 1088 8.53 - - - - - - - - - -

0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Standard 5 HP & Field Supplied Drive Standard 5 HP & Drive High Static 7.5 HP & Drive

Available External Static Pressure - IWG

1. Blower performance includes gas heat exchangers and 2” filters. See STATIC RESISTANCE table for additional applications.

2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.

3. kW = BHP x 0.838.

7.5 HP & Field Supplied Drive

Johnson Controls Unitary Products 37

Page 38

349218-JIM-F-0512

J20ZJ (20 Ton) Side Duct

Air Flow

(CFM)

5200 663 1.34 700 1.83 736 2.29 772 2.72 808 3.11 843 3.47 877 3.78 910 4.04 942 4.24 972 4.39 1000 4.47 1027 4.48 5600 680 1.71 717 2.20 753 2.66 789 3.09 825 3.48 860 3.84 894 4.15 927 4.41 959 4.61 989 4.76 1017 4.84 1044 4.85 6000 699 2.11 735 2.60 772 3.06 808 3.49 844 3.88 879 4.24 913 4.55 946 4.80 977 5.01 1007 5.15 1036 5.24 1062 5.25 6400 719 2.55 756 3.03 792 3.49 828 3.92 864 4.32 899 4.67 933 4.98 966 5.24 998 5.45 1028 5.59 1056 5.67 1083 5.68 6800 742 3.02 778 3.51 814 3.97 850 4.40 886 4.79 921 5.15 955 5.46 988 5.72 1020 5.92 1050 6.07 1078 6.15 1105 6.16 7200 765 3.54 802 4.03 838 4.49 874 4.92 910 5.32 945 5.67 979 5.98 1012 6.24 1044 6.44 1074 6.59 1102 6.67 1129 6.68 7600 790 4.11 827 4.60 863 5.06 899 5.49 935 5.88 970 6.24 1004 6.55 1037 6.81 1069 7.01 1099 7.16 1127 7.24 1154 7.25 8000 817 4.72 853 5.21 890 5.67 926 6.10 962 6.50 997 6.85 1031 7.16 1064 7.42 1095 7.62 1125 7.77 1154 7.85 1180 7.86 8400 845 5.38 881 5.87 918 6.33 954 6.76 990 7.16 1025 7.51 1059 7.82 1092 8.08 1123 8.28 1153 8.43 1182 8.51 1208 8.52 8800 874 6.09 911 6.58 947 7.04 983 7.47 1019 7.86 1054 8.22 1088 8.53 - - - - - - - - - 9200 905 6.85 941 7.33 977 7.79 1014 8.22 1049 8.62 -------------9600 936 7.65 973 8.13 1009 8.59 - - - - --------------

10000 969 8.49 - - - - - - - - --------------

0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Standard 5 HP & Field

Supplied Drive

Available External Static Pressure - IWG

Standard 5 HP & Drive High Static 7.5 HP & Drive

1. Blower performance includes gas heat exchangers and 2” filters. See STATIC RESISTANCE table for additional applications.

2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.

3. kW = BHP x 0.838.

7.5 HP & Field Supplied Drive

38 Johnson Controls Unitary Products

Page 39

J25ZJ (25 Ton) Side Duct

Air Flow

(CFM)

6600 760 2.51 793 3.11 824 3.68 856 4.23 887 4.74 919 5.23 950 5.70 983 6.15 7000 775 2.99 808 3.60 839 4.17 871 4.71 902 5.22 934 5.72 966 6.19 998 6.64 7400 792 3.51 824 4.11 856 4.69 887 5.23 918 5.74 950 6.24 982 6.70 1014 7.16 7800 809 4.07 841 4.67 873 5.24 904 5.78 935 6.30 967 6.79 999 7.26 1031 7.71 8200 826 4.66 859 5.27 890 5.84 922 6.38 953 6.89 985 7.39 1016 7.86 1049 8.31 8600 845 5.30 877 5.90 909 6.47 940 7.01 972 7.53 1003 8.02 1035 8.49 1067 8.94 9000 864 5.97 896 6.57 928 7.14 960 7.69 991 8.20 1022 8.69 1054 9.16 1087 9.61 9400 884 6.68 916 7.28 948 7.86 980 8.40 1011 8.91 1042 9.41 1074 9.88 1107 10.33

9800 905 7.43 937 8.04 969 8.61 1000 9.15 1032 9.67 1063 10.16 1095 10.63 1127 11.08 10200 926 8.22 958 8.83 990 9.40 1021 9.94 1053 10.46 1084 10.95 1116 11.42 1148 11.87 10600 948 9.05 980 9.66 1012 10.23 1043 10.77 1075 11.29 1106 11.78 1138 12.25 1170 12.70 11000 970 9.92 1003 10.52 1034 11.09 1066 11.64 1097 12.15 1128 12.64 1160 13.11 1193 13.56 11400 993 10.82 1025 11.43 1057 12.00 1089 12.54 1120 13.06 1151 13.55 1183 14.02 1216 14.47 11800 1017 11.76 1049 12.37 1081 12.94 1112 13.48 1143 14.00 1175 14.49 1207 14.96 1239 15.41 12200 1040 12.74 1073 13.34 1104 13.91 1136 14.46 1167 14.97 1199 15.46 1231 15.93 1263 16.38 12600 1065 13.75 1097 14.35 1129 14.92 1160 15.47 1192 15.98 1223 16.47 1255 16.94 - -

Air Flow

(CFM)

6600 1016 6.59 1050 7.00 1086 7.41 1123 7.81 1161 8.19 1202 8.58 1244 8.95 1289 9.33

7000 1031 7.07 1065 7.49 1101 7.89 1138 8.29 1176 8.68 1217 9.06 1259 9.44 1304 9.82

7400 1047 7.59 1081 8.01 1117 8.41 1154 8.81 1192 9.20 1233 9.58 1275 9.96 1320 10.34

7800 1064 8.14 1098 8.56 1134 8.97 1171 9.36 1209 9.75 1250 10.13 1292 10.51 1337 10.89

8200 1082 8.74 1116 9.16 1152 9.56 1189 9.96 1227 10.35 1268 10.73 1310 11.11 1355 11.49

8600 1101 9.37 1135 9.79 1170 10.20 1207 10.59 1246 10.98 1286 11.36 1329 11.74 1374 12.12

9000 1120 10.05 1154 10.46 1189 10.87 1226 11.27 1265 11.65 1305 12.04 1348 12.41 1393 12.79

9400 1140 10.76 1174 11.18 1209 11.58 1246 11.98 1285 12.37 1325 12.75 1368 13.13 1413 13.51

9800 1160 11.51 1195 11.93 1230 12.33 1267 12.73 1306 13.12 1346 13.50 1389 13.88 1434 14.26 10200 1182 12.30 1216 12.72 1251 13.12 1288 13.52 1327 13.91 1367 14.29 1410 14.67 1455 15.05 10600 1204 13.13 1238 13.55 1273 13.95 1310 14.35 1349 14.74 1389 15.12 1432 15.50 1477 15.88 11000 1226 14.00 1260 14.41 1296 14.82 1332 15.22 1371 15.60 1412 15.99 1454 16.36 1499 16.74 11400 1249 14.90 1283 15.32 1318 15.72 1355 16.12 1394 16.51 1434 16.89 ---11800 1272 15.84 1306 16.26 1342 16.66 1379 17.06 - ------12200 1296 16.82 1330 17.23 -----------12600 - - - -------------

0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Low Static 7.5 HP &

Field Supplied Drive

2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Available External Static Pressure - IWG

Low Static 7.5 HP & Drive

High Static 15 HP & Drive

Available External Static Pressure - IWG

Standard 10 HP & Drive High Static 15 HP & Drive

15 HP & Field Supplied Drive

1. Blower performance includes gas heat exchangers and 2” filters. See STATIC RESISTANCE table for additional applications.

2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.

3. kW = BHP x 0.82.

349218-JIM-F-0512

Standard 10 HP & Drive

Johnson Controls Unitary Products 39

Page 40

349218-JIM-F-0512

Table 16: Air Flow Performance - Bottom Duct Application J15ZJ (15 Ton) Bottom Duct

Air Flow

(CFM)

4000 768 1.24 806 1.55 846 1.83 888 2.09 930 2.32 972 2.53 1015 2.73 1056 2.91 1097 3.09 1136 3.27 1173 3.44 1208 3.61 4400 797 1.65 835 1.96 875 2.24 916 2.49 959 2.72 1001 2.93 1043 3.13 1085 3.32 1126 3.50 1165 3.67 1202 3.84 1237 4.02 4800 828 2.09 866 2.40 906 2.68 947 2.93 989 3.16 1032 3.38 1074 3.58 1116 3.76 1157 3.94 1196 4.11 1233 4.28 1267 4.46 5200 860 2.57 898 2.88 938 3.16 980 3.41 1022 3.65 1064 3.86 1107 4.06 1148 4.24 1189 4.42 1228 4.59 1265 4.77 1300 4.94 5600 894 3.09 932 3.40 972 3.68 1014 3.93 1056 4.16 1098 4.38 1141 4.57 1182 4.76 1223 4.94 1262 5.11 1299 5.28 1334 5.46 6000 930 3.64 968 3.95 1008 4.23 1049 4.48 1091 4.71 1134 4.93 1176 5.12 1218 5.31 1259 5.49 1298 5.66 - - - 6400 966 4.22 1005 4.53 1045 4.81 1086 5.06 1128 5.30 1171 5.51 1213 5.71 - - - - - - - - - 6800 1005 4.84 1043 5.14 1083 5.42 1124 5.68 - - -------------7200 1044 5.48 - - - - - - - - --------------

0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Standard 5 HP &

Field Supplied Drive

Standard 5 HP & Drive High Static 5 HP & Drive

Available External Static Pressure - IWG

1. Blower performance includes gas heat exchangers and 2” filters. See STATIC RESISTANCE table for additional applications.

2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.

3. kW = BHP x 0.898.

5 HP & Field Supplied Drive

J18ZJ (17.5 Ton) Bottom Duct

Air Flow

(CFM)

4400 661 0.74 697 1.19 733 1.62 768 2.03 803 2.40 838 2.73 871 3.02 904 3.26 935 3.45 964 3.59 992 3.66 1018 3.67 4800 677 1.07 712 1.53 748 1.96 784 2.36 819 2.73 853 3.06 887 3.35 919 3.59 950 3.79 980 3.92 1008 4.00 1034 4.01 5200 694 1.43 730 1.89 766 2.32 801 2.72 836 3.09 871 3.42 904 3.71 937 3.95 968 4.14 997 4.28 1025 4.35 1051 4.37 5600 713 1.82 749 2.27 785 2.71 820 3.11 856 3.48 890 3.81 923 4.10 956 4.34 987 4.53 1017 4.67 1045 4.74 1071 4.75 6000 734 2.25 770 2.70 806 3.13 841 3.53 877 3.90 911 4.23 944 4.52 977 4.77 1008 4.96 1038 5.09 1066 5.17 1092 5.18 6400 757 2.71 793 3.17 829 3.60 864 4.00 899 4.37 934 4.70 967 4.99 1000 5.23 1031 5.42 1060 5.56 1088 5.64 1114 5.65 6800 781 3.22 817 3.68 853 4.11 888 4.51 923 4.88 958 5.21 991 5.50 1024 5.74 1055 5.94 1085 6.07 1112 6.15 1139 6.16 7200 807 3.78 843 4.23 878 4.66 914 5.07 949 5.44 983 5.77 1017 6.06 1049 6.30 1081 6.49 1110 6.63 1138 6.70 1164 6.71 7600 834 4.38 870 4.83 905 5.26 941 5.67 976 6.04 1010 6.37 1044 6.66 1076 6.90 1108 7.09 1137 7.23 1165 7.30 1191 7.31 8000 862 5.02 898 5.48 934 5.91 969 6.31 1004 6.68 1039 7.01 1072 7.30 1105 7.55 1136 7.74 1166 7.87 1194 7.95 1220 7.96 8400 892 5.71 928 6.17 963 6.60 999 7.00 1034 7.37 1069 7.70 1102 7.99 1134 8.24 1166 8.43 1195 8.56 - - - 8800 923 6.45 959 6.91 994 7.34 1030 7.74 1065 8.11 1099 8.44 - - - - - - - - - - - -

0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Standard 5 HP &

Field Supplied Drive

Available External Static Pressure - IWG

Standard 5 HP & Drive High Static 7.5 HP & Drive

1. Blower performance includes gas heat exchangers and 2” filters. See STATIC RESISTANCE table for additional applications.

2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.

3. kW = BHP x 0.838.

7.5 HP & Field Supplied Drive

40 Johnson Controls Unitary Products

Page 41

349218-JIM-F-0512

J20ZJ (20 Ton) Bottom Duct

Air Flow

(CFM)

5200 694 1.43 730 1.89 766 2.32 801 2.72 836 3.09 871 3.42 904 3.71 937 3.95 968 4.14 997 4.28 1025 4.35 1051 4.37 5600 713 1.82 749 2.27 785 2.71 820 3.11 856 3.48 890 3.81 923 4.10 956 4.34 987 4.53 1017 4.67 1045 4.74 1071 4.75 6000 734 2.25 770 2.70 806 3.13 841 3.53 877 3.90 911 4.23 944 4.52 977 4.77 1008 4.96 1038 5.09 1066 5.17 1092 5.18 6400 757 2.71 793 3.17 829 3.60 864 4.00 899 4.37 934 4.70 967 4.99 1000 5.23 1031 5.42 1060 5.56 1088 5.64 1114 5.65 6800 781 3.22 817 3.68 853 4.11 888 4.51 923 4.88 958 5.21 991 5.50 1024 5.74 1055 5.94 1085 6.07 1112 6.15 1139 6.16 7200 807 3.78 843 4.23 878 4.66 914 5.07 949 5.44 983 5.77 1017 6.06 1049 6.30 1081 6.49 1110 6.63 1138 6.70 1164 6.71 7600 834 4.38 870 4.83 905 5.26 941 5.67 976 6.04 1010 6.37 1044 6.66 1076 6.90 1108 7.09 1137 7.23 1165 7.30 1191 7.31 8000 862 5.02 898 5.48 934 5.91 969 6.31 1004 6.68 1039 7.01 1072 7.30 1105 7.55 1136 7.74 1166 7.87 1194 7.95 1220 7.96 8400 892 5.71 928 6.17 963 6.60 999 7.00 1034 7.37 1069 7.70 1102 7.99 1134 8.24 1166 8.43 1195 8.56 - - - 8800 923 6.45 959 6.91 994 7.34 1030 7.74 1065 8.11 1099 8.44 - - - - - - - - - - - 9200 955 7.23 991 7.68 1026 8.11 1062 8.52 - - -------------9600 988 8.05 1024 8.51 - - - - - - --------------

0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Standard 5 HP & Field

Supplied

Drive

Standard 5 HP & Drive High Static 7.5 HP & Drive

Available External Static Pressure - IWG

1. Blower performance includes gas heat exchangers and 2” filters. See STATIC RESISTANCE table for additional applications.

2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.

3. kW = BHP x 0.838.

7.5 HP & Field Supplied Drive

Johnson Controls Unitary Products 41

Page 42

349218-JIM-F-0512

J25ZJ (25 Ton) Bottom Duct

Air Flow

(CFM)

6600 787 2.67 819 3.23 850 3.76 881 4.27 912 4.75 943 5.21 974 5.65 7000 804 3.18 835 3.74 867 4.27 898 4.78 928 5.26 959 5.72 991 6.16 7400 821 3.72 853 4.28 884 4.82 915 5.32 946 5.80 977 6.26 1008 6.70 7800 839 4.30 871 4.86 902 5.40 933 5.90 964 6.39 995 6.85 1026 7.28 8200 858 4.92 890 5.48 921 6.02 952 6.52 983 7.01 1013 7.47 1045 7.90 8600 877 5.58 909 6.14 940 6.68 971 7.18 1002 7.66 1033 8.12 1064 8.56 9000 898 6.28 929 6.84 960 7.37 991 7.88 1022 8.36 1053 8.82 1084 9.26 9400 918 7.01 950 7.57 981 8.10 1012 8.61 1043 9.09 1074 9.55 1105 9.99

9800 940 7.78 972 8.34 1003 8.87 1034 9.38 1064 9.86 1095 10.32 1127 10.76 10200 962 8.58 994 9.14 1025 9.68 1056 10.18 1086 10.67 1117 11.13 1149 11.56 10600 984 9.42 1016 9.98 1047 10.52 1078 11.02 1109 11.51 1140 11.96 1171 12.40 11000 1007 10.30 1039 10.86 1070 11.39 1101 11.90 1132 12.38 1163 12.84 1194 13.28 11400 1031 11.20 1063 11.76 1094 12.30 1125 12.80 1156 13.29 1187 13.75 1218 14.18 11800 1055 12.14 1087 12.70 1118 13.24 1149 13.74 1180 14.23 1211 14.69 1242 15.12 12200 1080 13.11 1111 13.68 1142 14.21 1173 14.72 1204 15.20 1235 15.66 1266 16.10 12600 1104 14.12 1136 14.68 1167 15.21 1198 15.72 1229 16.20 1260 16.66 1291 17.10

Air Flow

(CFM)

6600 1006 6.07 1039 6.48 1072 6.87 1107 7.25 1144 7.62 1182 7.98 1221 8.33 1263 8.68 1307 9.04

7000 1023 6.58 1055 6.98 1089 7.37 1124 7.75 1160 8.12 1198 8.48 1238 8.84 1280 9.19 1324 9.54

7400 1040 7.12 1072 7.53 1106 7.92 1141 8.30 1177 8.67 1215 9.03 1255 9.38 1297 9.74 1341 10.09

7800 1058 7.71 1090 8.11 1124 8.50 1159 8.88 1195 9.25 1233 9.61 1273 9.97 1315 10.32 1359 10.67

8200 1077 8.33 1109 8.73 1143 9.12 1178 9.50 1214 9.87 1252 10.23 1292 10.59 1334 10.94 1378 11.29

8600 1096 8.98 1129 9.39 1162 9.78 1197 10.16 1234 10.53 1272 10.89 1311 11.24 1353 11.60 1397 11.95

9000 1116 9.68 1149 10.08 1183 10.47 1218 10.85 1254 11.22 1292 11.58 1332 11.94 1373 12.29 1418 12.64

9400 1137 10.41 1170 10.82 1203 11.21 1238 11.59 1275 11.95 1313 12.32 1352 12.67 1394 13.02 1438 13.37

9800 1159 11.18 1191 11.59 1225 11.98 1260 12.35 1296 12.72 1334 13.09 1374 13.44 1416 13.79 1460 14.14 10200 1181 11.99 1213 12.39 1247 12.78 1282 13.16 1318 13.53 1356 13.89 1396 14.25 1438 14.60 1482 14.95 10600 1203 12.82 1236 13.23 1269 13.62 1304 14.00 1341 14.37 1379 14.73 1418 15.08 1460 15.44 1504 15.79 11000 1226 13.70 1259 14.10 1293 14.49 1327 14.87 1364 15.24 1402 15.60 1441 15.96 1483 16.31 1528 16.66 11400 1250 14.61 1282 15.01 1316 15.40 1351 15.78 1387 16.15 1425 16.51 1465 16.87 1507 17.22 - 11800 1274 15.55 1307 15.95 1340 16.34 1375 16.72 1411 17.09 -------12200 1298 16.52 1331 16.92 -------------12600 - - - ---------------

0.4 0.6 0.8 1.0 1.2 1.4 1.6

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Low Static

7.5 HP & Field

Supplied

Drive

1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4

RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

Available External Static Pressure - IWG

Low Static 7.5 HP & Drive

High Static 15 HP & Drive

Available External Static Pressure - IWG

Standard 10 HP & Drive High Static 15 HP & Drive

1. Blower performance includes gas heat exchangers and 2” filters. See STATIC RESISTANCE table for additional applications.

2. See RPM SELECTION table to determine desired motor sheave setting and to determine the maximum continuous BHP.

3. kW = BHP x 0.82.

Standard 10 HP & Drive

15 HP & Field Supplied Drive

42 Johnson Controls Unitary Products

Page 43

Table 17: RPM Selection

Size

(Tons)

J15 (15)

J18

(17.5)

J20 (20)

J25 (25)

Model HP

7.5 8.63 1VP60 BK090 905 950 990 1035 1075 1120 N/A

7.5 8.63 1VP60 1B5V94 810 850 885 920 960 1000 N/A 10 11.50 1VP75X 1B5V110 975 1005 1040 1070 1100 1135 1165 15 17.25 1VP75X 1B5V94 1140 1180 1215 1255 1290 1330 1365

5 5.75 1VP65 BK110 815 850 885 920 950 985 N/A 5 5.75 1VP65 BK090 1010 1055 1095 1135 1180 1220 N/A 5 5.75 1VP60 BK110 730 765 800 835 870 905 N/A

5 5.75 1VP60 BK110 730 765 800 835 870 905 N/A

Max

BHP

Table 18: Indoor Blower Specifications

Size

(Tons)

J15

(15)

J18

(17.5)

J20

(20)

J25

(25)

Model

HP RPM Eff. SF Frame

5 1725 0.89 1.15 184T 5.2 - 6.4 1 1/8 1VP65 10.4 1 BK110 BX83 5 1725 0.89 1.15 184T 5.2 - 6.4 1 1/8 1VP65 8.4 1 BK090 BX81 5 1725 0.89 1.15 184T 4.2 - 5.5 1 1/8 1VP60 10.4 1 3/16 BK110 BX78

7.5 1725 0.91 1.15 213T 4.2 - 5.5 1 3/8 1VP60 8.4 1 3/16 BK090 BX75 5 1725 0.89 1.15 184T 4.2 - 5.5 1 1/8 1VP60 10.4 1 3/16 BK110 BX78

7.5 1725 0.91 1.15 213T 4.2 - 5.5 1 3/8 1VP60 8.4 1 3/16 BK090 BX75

7.5 1725 0.91 1.15 213T 4.2 - 5.5 1 3/8 1VP60 9.5 1 7/16 1B5V94 BX78

10 1725 0.89 1.15 215T 5.8 - 7.0 1 3/8 1VP75X 11.1 1 7/16 1B5V110 5VX840 15 1725 0.91 1.15 254T 6.2 - 7.4 1 5/8 1VP75X 9.5 1 7/16 1B5V94 5VX860

Motor Motor Sheave Blower Sheave

Motor

Sheave

Blower

Sheave

6 Turns

Open

Datum Dia.

(in.)

5 Turns

Open

Bore (in.) Model

4 Turns

Open

3 Turns

Open

Datum Dia.

(in.)

349218-JIM-F-0512

2 Turns

Open

Bore (in.) Model

1 Turn

Open

Fully

Closed

Belt

Table 19: Power Exhaust Specifications

Voltage

208/230-1-60 3/4 1075 1 7.7 5.0 6.25 5250

460-1-60 3/4 1075 1 4.1 2.2 2.75 5250 575-1-60 3/4 1050 1 2.84 1.5 1.875 5250

1. Motors are multi-tapped and factory wired for high speed.

HP RPM

Air Balance

Motor Motor

QTY LRA FLA MCA

To check the supply air CFM after the initial balancing has been completed:

1. Remove the two 5/16” dot plugs from the blower motor and the filter access panels shown in the Unit Dimensions and Rear View Clearances Figure 6.

On VAV units be certain that the VFD drive is set to maximum output, exhaust dampers are closed and individual space damper boxes are full open.

VFD units with bypass must not be in bypass mode (‘LINE’ position) unless all individual space dampers are full open.

Start the supply air blower motor. Adjust the resistances in both the supply and the return air duct systems to balance the air distribution throughout the conditioned space. The job specifications may require that this balancing be done by someone other than the equipment installer.

2. Insert at least 8" of 1/4 inch tubing into each of these holes for sufficient penetration into the air flow on both sides of the indoor coil.

NOTE: The tubes must be inserted and held in a position

perpendicular to the air flow so that velocity pressure will not affect the static pressure readings.

3. Using an inclined manometer, determine the pressure drop across a dry evaporator coil. Since the moisture on an evaporator coil may vary greatly, measuring the pressure drop across a wet coil under field conditions would be inaccurate. To assure a dry coil, the compressors should be deactivated while the test is being run.

CFM @

0.1 ESP

Johnson Controls Unitary Products 43

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Pressure Drop Across A Dry Indoor Coil VS Supply Air CFM

0.45

0.4

0.35

0.3

0.25

0.2

0.15

0.1

Pressure Drop (IWG)

0.05

4000 5000 6000 7000 8000 9000 10000 11000 12000

Nominal Air Flow (CFM)

Figure 20: Pressure Drop Across A Dry Indoor Coil Vs.

Supply Air CFM For All Unit Tonnages

4. Knowing the pressure drop across a dry coil, the actual CFM through the unit can be determined from the curve in Pressure Drop vs. Supply Air CFM Figure 20.

Failure to properly adjust the total system air quantity can result in extensive blower damage.

After readings have been obtained, remove the tubes and reinstall the two 5/16” dot plugs that were removed in Step 1.

NOTE: De-energize the compressors before taking any test

measurements to assure a dry indoor coil.

Supply Air Drive Adjustment

The RPM of the supply air blower will depend on the required CFM, the unit accessories or options and the static resistances of both the supply and the return air duct systems. With this information, the RPM for the supply air blower and the motor pulley adjustment (turns open) can be determined from the Blower Performance Data Tables.

Belt drive blower systems MUST be adjusted to the specific static and CFM requirements for the application. The belt drive blowers are NOT set at the factory for any specific static or CFM. Adjustments of the blower speed and belt tension are REQUIRED. Tighten blower pulley and motor sheave set screws after these adjustments. Re-checking set screws after 10-12 hours run time is recommended.

High speed drive accessories (containing a smaller blower pulley and a shorter belt) are available for applications requiring the supply air blower to produce higher CFM's and/or higher static pressures. Use Model 1LD0460 for 15 ton units, Model 1LD0417 for 17.5 and 20 ton units, and Model 1LD0435 for 25 ton units. Refer to the Blower Motor and Drive Data Table 18.

Note the following:

1. The supply air CFM must be within the limitations shown in the Blower Performance Tables 15 and 16.

2. Pulleys can be adjusted in half turn increments.

3. The tension on the belt should be adjusted as shown in the Bet Adjustment, Figure 18.

4. Tighten blower pulley and motor sheave set screws after any adjustments. Re-check set screws after 10-12 hours run time recommended.

Additional Static Resistance

Size

(Tons)

J15 (15)

J18 (17.5)

J20 (20) J25 (25)

1. Add these values to the available static resistance in the respective Blower Performance Tables.

2. Deduct these values from the available external static pressure shown in the respective Blower Performance Tables.

3. The pressure drop through the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct is less than 0.25 IWG, the unit will deliver less CFM during full economizer operation.

Model CFM Cooling Only

4500 0.10 0.10 0.10 0.10 0.20 0.20

6000 0.10 0.10 0.10 0.20 0.30 0.40 7500 0.10 0.10 0.10 0.30 0.40 0.60 6000 0.10 0.10 0.10 0.10 0.20 0.20 7500 0.10 0.10 0.10 0.20 0.30 0.40

9000 0.15 0.15 0.10 0.30 0.40 0.60 10500 0.15 0.15 0.20 0.40 0.60 0.80 12000 0.20 0.20 0.30 0.50 0.70 0.90

Economizer

2 3

18 36 54 72

Electric Heat kW

44 Johnson Controls Unitary Products

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Operation

Cooling Sequence Of Operation

For J**ZJ units, the thermostat makes a circuit between “R” and “Y1” for the first stage of cooling.

The call is passed to the Unit Control Board (UCB), which then determines whether the requested operation is available and, if so, which components to energize.

For gas heating, the UCB monitors the "W1" call but does not handle the operation of the gas furnace. An ignition control board controls the gas heater operation. For electric heat units, the UCB passes the call to the electric heater. In both cases, when the "W1" call is sensed, the indoor air blower is energized following a specified heating delay.

If at any time a call for both heating and cooling are present, the heating operation will be performed. If operating, the cooling system is halted as with a completion of a call for cooling. Heating always takes priority.

Continuous Blower

By setting the room thermostat fan switch to "ON," the supply air blower will operate continuously.

Intermittent Blower

With the room thermostat fan switch set to "AUTO" and the system switch set to either the "AUTO" or "HEAT" settings, the blower is energized whenever a cooling or heating operation is requested. The blower is energized after any specified delay associated with the operation.

When energized, the indoor blower has a minimum run time of 30 seconds. Additionally, the indoor blower has a delay of 10 seconds between operations.

econds between operations.

Optional VAV Startup and Control

through network communications with Simplicity™ PC and other BAS control systems.

Figure 21: Occupied Jumper

Once placed into the Occupied Mode, the speed of the indoor blower motor is controlled by duct static pressure. The Duct Static set point (default = 1.5") is the pressure that the VFD drive will maintain when operating the unit in VAV mode. If the duct static pressure reaches or exceeds the high-limit set-point (default = 4.5"), then the supply fan motor will be shutdown.

The Supply Air Temperature (SAT) is controlled by staging compressors on and off to satisfy the "Operating Cooling Supply Air Temp Set point". There are 3 set points that determine the resulting "Operating Cooling Supply Air Temp Set point".

1. VAV Cooling Supply Air Temp Upper Set point (default 60° F)

2. VAV Cooling Supply Air Temp Lower Set point (default 55° F)

3. VAV Supply Air Temp Reset Set point (default 72° F)

When the Return Air Temp (RAT) is above the "VAV Supply Air Temp Reset Set point" the SAT will be maintained at +/- 5 degrees of the "VAV Cooling Supply Air Temp Lower Set point".

For units with VFD and VAV control, the unit must first be put into the Occupied Mode to start operation. The default setting for all VAV units is 'Unoccupied', therefore the installer must add a jumper wire between terminals R - OCC on the VAV addon board to put the unit into 'Occupied' Mode. Additionally, the unit can be switched between Unoccupied/Occupied mode

Johnson Controls Unitary Products 45

When the Return Air Temp (RAT) is below the "VAV Supply Air Temp Reset Set point" the SAT will be maintained at +/- 5 degrees of the "VAV Cooling Supply Air Temp Upper Set point".

When the Outdoor air condition is sufficient for free cooling, the economizer will modulate to control the SAT to +/- 1 degrees of the operational set point.

The following components are needed to access the control points in the Simplicity® controller. Installation and operation guide is located on UPGNET.

1. Computer running Windows software with a standard USB port.

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349218-JIM-F-0512

2. Simplicity® PC Software (http://www.yorkupg.com/ software.asp)

3. Freenet USB adapter driver, (

http://www.yorkupg.com/

software.asp)

4. Simplicity® Freenet USB Adapter (S1-03101967000)

5. Freenet service cable (S1-02538682000)

No Outdoor Air Options

When the thermostat calls for the first stage of cooling, the lowvoltage control circuit from “R” to “Y1” and “G” is completed. The UCB energizes the economizer (if installed and free cooling is available) or the first available compressor

and the condenser fans. For first stage cooling, compressor #1 is energized. If compressor #1 is unavailable, compressor #2 is energized. After completing the specified fan on delay for cooling, the UCB will energize the blower motor.

When the thermostat calls for the second stage of cooling, the low-voltage control circuit from “R” to “Y2” is completed. Compressor #2 is energized, provided it has not been locked out, and condenser fan motor #1, and condenser fan motor #2 remain energized. (If the ambient temperature is above 60ºF.)

If there is an initial call for more than one stage of cooling, the UCB will delay energizing compressors #2, #3 & #4 by 30 seconds each, depending on how many stages are called for, in order to avoid a power in-rush.

Once the thermostat has been satisfied, it will de-energize Y1, Y2, Y3 and Y4. If the compressors have satisfied their minimum run times, the compressors and condenser fans are deenergized. Otherwise, the unit operates each cooling system until the minimum run times for the compressors have been completed. Upon the final compressor de-energizing, the blower is stopped following the elapse of the fan off delay for cooling.

To be available, a compressor must not be locked-out due to a high or low-pressure switch or freezestat trip and the Anti- Short Cycle Delay (ASCD) must have elapsed.

These units utilize a lead-lag feature that results in an equal amount of run hours on all compressors, thereby extending the life of the compressors. This feature works as follows: If the thermostat requires for more than one stage of cooling, the currently off compressor with the least number of run hours will be the next to be energized. When the thermostat requires fewer stages of cooling, the currently running compressor with the most run hours will be the first to be de-energized.

Economizer With Single Enthalpy Sensor

When the room thermostat calls for “first-stage” cooling, the low voltage control circuit from “R” to “G” and “Y1” is completed. The UCB energizes the blower motor (if the fan switch on the room thermostat is set in the “AUTO” position) and drives the economizer dampers from fully closed to their minimum position. If the enthalpy of the outdoor air is below the set point of the enthalpy controller (previously determined), “Y1”

energizes the economizer. The dampers will modulate to maintain a constant supply air temperature as monitored by the discharge air sensor. If the outdoor air enthalpy is above the set point, “Y1” energizes compressor #1.

When the thermostat calls for “second-stage” cooling, the low voltage control circuit from “R” to “Y2” is completed. The UCB energizes the first available compressor. If the enthalpy of the outdoor air is below the set point of the enthalpy controller (i.e. first stage has energized the economizer), “Y2” will energize compressor #1. If the outdoor air is above the set point, “Y2” will energize compressor #2. If Y2 brings on compressor #1 and this condition remains for more than 20 minutes, then compressor #2 will be energized until the thermostat is satisfied.

Once the thermostat has been satisfied, it will de-energize “Y1” and “Y2”. If the compressors have satisfied their minimum run times, the compressors and condenser fans are de-energized. Otherwise, the unit operates each cooling system until the minimum run times for the compressors have been completed. Upon the final compressor de-energizing, the blower is stopped following the elapse of the fan off delay for cooling, and the economizer damper goes to the closed position. If the unit is in continues fan operation, the economizer damper goes to the minimum position.

Economizer With Dual Enthalpy Sensors

The operation with the dual enthalpy sensors is identical to the single sensor except that a second enthalpy sensor is mounted in the return air. This return air sensor allows the economizer to choose between outdoor air and return air, whichever has the lowest enthalpy value, to provide maximum operating efficiency.

Economizer With Power Exhaust

A unit equipped with an economizer (single or dual enthalpy) and a power exhaust operates as specified above with one addition. The power exhaust motor is energized 45 seconds after the actuator position exceeds the exhaust fan set point on the economizer control. When the power exhaust is operating, the second stage of mechanical cooling will not operate. As always, the "R" to "G" connection provides minimum position but does not provide power exhaust operation.

Economizer With Optional VAV Or Intelli-comfort II™ Control

The position of the outside air and return air dampers are controlled through a 2-10 VDC signal from the VAV or IntelliComfort II™ control board. The economizer is enabled only in Occupied or Recovery mode. When the control is not powered or is in Unoccupied mode, the outside air dampers will be closed. When the supply fan is powered and there is no Y1 call, or if free-cooling is unavailable, the control opens the economizer dampers to the minimum position setting.

Free-cooling is available if the outdoor air temperature meets one of the three criteria discussed below, based upon the unit's configuration.

46 Johnson Controls Unitary Products

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• Dry Bulb: The control refers to input from the Outside Air Temperature sensor and will allow free-cooling when the outdoor temperature is less than both the First-Stage SAT

Control setpoint plus 5 °F, and the Economizer OAT Enable setpoint.

• Single Enthalpy (optional): A field-installed, Outdoor Air Humidity sensor is connected to the control. When the measured outdoor enthalpy is below the Outside Air Enthalpy setpoint, and the outdoor temperature is less than the First-Stage SAT Control setpoint plus 5 °F, freecooling is available.

• Dual Enthalpy (optional): Both the field-installed Outdoor Air Humidity and the Return Air Humidity sensors are connected to the control. When the measured outdoor air enthalpy is less than the measured return air enthalpy, and the outdoor temperature is less than the First-Stage SAT Control setpoint plus 5 °F, free-cooling is available.

If free-cooling is available with a Y1 call, then the control modulates the economizer dampers to maintain the First-Stage SAT Control setpoint, plus or minus one degree. If free-cooling is unavailable, then 1st-stage mechanical cooling is initiated.

If at anytime the outdoor air temperature rises above the First- Stage SAT Control setpoint plus 5 °F, while free-cooling is available, then a Y1 call will also initiate 1st-stage mechanical cooling.

For a Y2 call, free-cooling is available based upon the criteria described above, except a Second-Stage SAT Control setpoint is used in the determination.

Once the call for cooling has been satisfied, it will de-energize any compressors and condenser fans, after the minimum compressor run times have been satisfied. Otherwise, the unit operates each cooling system until the minimum run times for the compressors have been completed.

Upon de-energizing the final compressor, the blower will continue to run with the economizer damper in its minimum position if in the Occupied mode; otherwise, the blower will stop following the elapse of the fan-off delay for cooling, and the economizer outdoor damper will close.

Economizer With Optional VAV Blower With Power Exhaust

The power exhaust motor is energized via the controller's EXH~ terminal and the ER relay, based on the position of the economizer damper parameter settings in the VAV control. Minimum run time is 10 seconds; minimum off time is 60 seconds. The outlet pressure of the power exhaust fan forces the barometric relief dampers open; gravity closes the dampers when the exhaust fan is off.

Economizer With Optional Intelli-comfort II™ With Power Exhaust

The power exhaust motor is energized via the exhaust relay based on the position of the economizer actuator's auxiliary switch adjustment screw. The adjustment screw represents the outdoor

damper position at which to activate power exhaust, and can be set between 25 to 85 degrees open. The outlet pressure of the power exhaust fan forces the barometric relief dampers open; gravity closes the dampers when the exhaust fan is off.

Motorized Outdoor Air Dampers

This system operation is the same as the units with no outdoor air options with one exception. When the “R” to “G” circuit is complete, the motorized damper drives open to a position set by the thumbwheel on the damper motor. When the “R” to “G” circuit is opened, the damper spring returns fully closed.

Cooling Operation Errors

Each cooling system is monitored for operation outside of the intended parameters. Errors are handled as described below. All system errors override minimum run times for compressors.

High-Pressure Limit Switch

During cooling operation, if a high-pressure limit switch opens, the UCB will de-energize the associated compressor, initiate the ASCD (Anti-short cycle delay), and, if the other compressor is idle, stop the condenser fans. If the call for cooling is still present at the conclusion of the ASCD, the UCB will re-energize the halted compressor.

Should a high-pressure switch open three times within two hours of operation, the UCB will lock-out the associated compressor and flash a code (see Table 25). If the other compressor is inactive, the condenser fans will be deenergized.

Low-Pressure Limit Switch

The low-pressure limit switch is not monitored during the initial 30 seconds of a cooling system's operation. For the following 30 seconds, the UCB will monitor the low-pressure switch to ensure it closes. If the low-pressure switch fails to close after the 30-second monitoring phase, the UCB will de-energize the associated compressor, initiate the ASCD, and, if the other compressor is idle, stop the condenser fans. If the LPS is still open after the ASCD, the compressor will not be energized for 30 seconds. The second and third times that the UCB sees an open LPS will count towards the three occurrences that will cause a UCB lock-out.

Once the low-pressure switch has been proven (closed during the 30-second monitor period described above), the UCB will monitor the low-pressure limit switch for any openings. If the low-pressure switch opens for greater than 5 seconds, the UCB will de-energize the associated compressor, initiate the ASCD, and, if the other compressor is idle, stop the condenser fans.

If the call for cooling is still present at the conclusion of the ASCD, the UCB will re-energize the halted compressor.

Should a low-pressure switch open three times within one hour of operation, the UCB will lock-out the associated compressor and flash a code (Table 25). If the other compressor is inactive, the condenser fans will be de-energized.

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Freezestat

During cooling operation, if a freezestat opens, the UCB will deenergize the associated compressor, initiate the ASCD, and, if the other compressor is idle, stop the condenser fans. If the call for cooling is still present at the conclusion of the ASCD, the UCB will re-energize the halted compressor.

Should a freezestat open three times within two hours of operation, the UCB will lock-out the associated compressor and flash a code (Table 25). If the other compressor is inactive, the condenser fans will be de-energized.

Low Ambient Cooling

To determine when to operate in low ambient mode, the UCB has a pair of terminals connected to a temperature-activated switch set at 45ºF. When the low ambient switch is closed and the thermostat is calling for cooling, the UCB will operate in the low ambient mode.

Low ambient mode operates the compressors in this manner: 10 minutes on, 5 minutes off. The indoor blower is operated throughout the cycle. The 5-minute off period is necessary to defrost the indoor coil.

Low ambient mode always begins with compressor operation. Compressor minimum run time may extend the minutes of compressor operation. The defrost cycle will begin immediately following the elapse of the minimum run time.

Compressor Protection

In addition to the external pressure switches, the compressors also have inherent (internal) protection. If there is an abnormal temperature rise in a compressor, the protector will open to shut down the compressor. The UCB incorporates features to minimize compressor wear and damage. An Anti-Short Cycle Delay (ASCD) is utilized to prevent operation of a compressor too soon after its previous run. Additionally, a minimum run time is imposed any time a compressor is energized.

The ASCD is initiated on unit start-up and on any compressor reset or lock-out.

Flash Codes

The UCB will initiate a flash code associated with errors within the system. Refer to UNIT CONTROL BOARD FLASH CODES Table 25.

Reset

Remove the call for cooling, by raising thermostat setting higher than the conditioned space temperature. This resets any pressure or freezestat flash codes.

Electric Heating Sequence Of Operations

The following sequence describes the operation of the electric heat section.

When operating in low ambient mode, the UCB will not lockout the compressors due to a freezestat trip. However, a freezestat trip will de-energize the associated compressor. If the call for cooling is still present at the end of the ASCD and the freezestat has closed, the unit will resume operation.

Safety Controls

The unit control board monitors the following inputs for each cooling system:

1. A suction line freezestat to protect against low evaporator temperatures due to a low airflow or a low return air temperature, (opens at 26 ± 5 °F and resets at 38 ± 5°F).

2. A high-pressure switch to protect against excessive discharge pressures due to a blocked condenser coil or a condenser motor failure, (opens at 625 ± 25 psig and resets 500 ± 25 psig).

3. A low-pressure switch to protect against loss of refrigerant charge, (opens at 50 ± 5 psig and resets at 71 ± 5 psig).

The above pressure switches are hard-soldered to the unit. The refrigeration systems are independently monitored and controlled. On any fault, only the associated system will be affected by any safety/preventive action. The other refrigerant system will continue in operation unless it is affected by the fault as well.

The unit control board monitors the temperature limit switch of electric heat units and the temperature limit switch and the gas valve of gas furnace units.

For units with VFD and electric heat, the speed of the indoor blower motor continues to be controlled by duct static pressure via the VAV control board.

If there are VAV boxes present in the duct system, the boxes must be driven to the full-open position using a customer-supplied power source to assure adequate airflow across the heating elements.

Single-stage heating: (applies only to 18 KW heater, all other heaters MUST use a two-stage thermostat)

a. Upon a call for heat by the thermostat, the heater

contactor (6M) will be energized. After completing the specified fan on delay for heating, the UCB will energize the blower motor.

b The thermostat will cycle the electric heat to satisfy the

heating requirements of the conditioned space.

Two-stage heating: (applies to all heaters except 18 KW)

a. Upon a call for first-stage heat by the thermostat, the

heater contactor (6M) (6M & 7M on 72 KW, 240V) will be energized. After completing the specified fan on delay for heating, the UCB will energize the blower motor.

If the second stage of heat is required, heater contactor (7M) will be energized. Note that on the 54 KW, 240V heater, heater contactors (7M & 8M) will be energized and

48 Johnson Controls Unitary Products

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on the 72 KW, 240V heater, heater contactors (8M & 9M) will be energized. After completing the specified fan on delay for heating, the UCB will energize the blower motor.

b The thermostat will cycle the electric heat to satisfy the

heating requirements of the conditioned space.

NOTE: All 240 & 480V heaters are provided with manual reset

backup protection limits. These will de-energize the heaters should the primary limit fail to open or the contactors fail to open in a failure mode.

Electric Heat Operation Errors Temperature Limit

If the UCB senses zero volts from the high temperature limit, the indoor blower motor is immediately energized.

This limit is monitored regardless of unit operation status, i.e. the limit is monitored at all times.

If the temperature limit opens three times within one hour, it will lock-on the indoor blower motor and a flash code is initiated (See Table 25).

Safety Controls

The UCB monitors the temperature limit switch of electric heat units.

The control circuit includes the following safety controls:

Temperature Limit Switch (TLs)

1. Temperature Limit Switch (TLS 1, 2). This control is located inside the heater compartment and

is set to open at the temperature indicated in the Limit Control Setting Table 20. It resets automatically. The limit switch operates when a high temperature condition, caused by inadequate supply air flow occurs, thus shutting down the heater and energizing the blower.

2. Temperature Limit Switch (TLS 3, 4, 5 and 6). This control is located inside the heater compartment and

is set to open at the temperature indicated in the Limit Control Setting Table 20. It is a manual reset limit. These limit switches will de-energize the heaters should the primary limit fail to open or the contactors fail to open in a failure mode.

Table 20: Limit Control Setting

Unit

(Tons)

15 240

Voltage

Temperature,

Heater

18 120 170 36 120 170 54 120 170 72 120 170

Limit Switch

1, 2

Opens, °F

Temperature,

Limit Switch

3, 4, 5, 6

Opens, °F

Table 20: Limit Control Setting

Unit

(Tons)

17.5, 20 and 25

15, 17.5,

20 and 25

15, 17.5,

20 and 25

Voltage

240

460

600

Temperature,

Heater

18 140 200 36 140 200 54 140 200 72 140 200 18 120 170 36 120 170 54 120 170 72 120 170 18 120 36 120 54 120 72 120 -

Limit Switch

1, 2

Opens, °F

Temperature,

Limit Switch

3, 4, 5, 6

Opens, °F

Flash Codes

The UCB will initiate a flash code associated with errors within the system. Refer to UNIT CONTROL BOARD FLASH CODES Table 25.

Reset

Remove the call for heating by lowering the thermostat setting lower than the conditioned space temperature.This resets any flash codes.

Electric Heat Anticipator Setpoints

It is important that the anticipator setpoint be correct. Too high of a setting will result in longer heat cycles and a greater temperature swing in the conditioned space. Reducing the value below the correct setpoint will give shorter “ON” cycles and may result in the lowering of the temperature within the conditioned space. Refer to Table 21 for the required electric heat anticipator setting.

Table 21: Electric Heat Anticipator Setpoint

Heater

18 36 0.29 0.29 54 0.29 0.58 72 0.29 0.58 18 36 0.29 0.29 54 0.29 0.29 72 0.29 0.29 18 36 0.29 0.29 54 0.29 0.29 72 0.29 0.29

Voltage

208/230-3-60

460-3-60

575-3-60

Setting, Amps

Th1 Th2

0.29 -

Gas Heating Sequence Of Operations

The following sequence describes the operation of the gas heat section.

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operation for five minutes or until 24V power is removed from the module either at the unit or by resetting the room thermostat.

For units with VFD and gas heat, the speed of the indoor blower motor continues to be controlled by duct static pressure via the VAV control board.

If there are VAV boxes present in the duct system, the boxes must be driven to the full-open position using a customer-supplied power source to assure adequate airflow across the heat exchanger tubes.

When the thermostat calls for the first stage of heating, the lowvoltage control circuit from “R” to “W1” and “G” is completed, thru the UCB. The heat relay “RW1” is energized. The “RW1-2” contacts close energizing the draft motor control. The draft motor control contacts close and start the draft motor. As the speed of the draft motor reaches approximately 2500 RPM, the centrifugal switch contact, located on the end of the draft motor shaft, closes to power the first stage ignition module “IC1”, thru the “RW1-1” contacts.

Ignition module “IC1” will immediately start the first stage igniter sparking and will open the redundant valve located inside the first stage main gas valve “GV1” to allow a flow of gas to only the first stage carryover tube. Only after the pilot flame has been ignited and the presence of pilot flame detected at the “IC1” by a signal sent back through the flame sensor is sparking terminated and the first stage main gas valve opened.

Gas flows into each of the main burners and is ignited from the carryover tube flame.

After completing the specified fan on delay for heating, the UCB will energize the blower motor.

If “IC1” fails to detect a pilot flame, it will continue to try for a maximum of 85 seconds to ignite the pilot tube. If the pilot flame is not detected, then “IC1” will lock out first stage furnace operation for five minutes or until 24V power is removed from the module either at the unit or by resetting the room thermostat.

When the thermostat calls for the second stage of heating, the low-voltage control circuit from “R” to “W2” is completed, thru the UCB. Heat relay “RW2” is energized. The “RW2-1” contact is closed energizing the second stage ignition module “IC2”. “IC2” will immediately start the second stage igniter sparking and will open the redundant valve located inside the second stage main gas valve “GV2” to allow a flow of gas to the second stage carryover tube. Only after the pilot flame has been ignited and the presence of pilot flame detected at “IC2” by a signal sent back through the flame sensor is sparking terminated and the main gas valve opened.

Gas flows into each of the second stage main burners and is ignited from the carryover tube flame.

If “IC2” fails to detect a pilot flame, it will continue to try for a maximum of 85 seconds to ignite the pilot tube. If the pilot flame is not detected, then “IC2” will lock out first stage furnace

NOTE: That the second stage furnace can operate even if first

stage has locked out.

When the thermostat satisfies de-energizing the “RW2”and “RW1”, thus opening all gas valves. The blower motor will continue to run after the furnace is shut down until the specified fan off delay for heating has been satisfied. The UCB will deenergize the blower motor.

Redundant valve

Gas main

Gas Valve

To pilot burner

Main valve

To main burner

Figure 22: Gas Valve Piping

When the thermostat calls for the first stage of heating, the lowvoltage control circuit from “R” to “W1” is completed. A call for heat passes through the UCB to the ignition control board (ICB). The UCB monitors the “W1” call and acts upon any call for heat. Once voltage has been sensed at “W1”, the UCB will initiate the fan on delay for heating, energizing the indoor blower after the specified delay has elapsed.

When the thermostat has been satisfied, heating calls are ceased. The GV is immediately de-energized. The blower is deenergized after the fan off delay for heating has elapsed. The draft motor performs a 25-second post purge.

Gas Heating Operation Errors Temperature Limit

If the UCB senses zero volts from the high temperature limit, the indoor blower motor is immediately energized. When the UCB again senses 24 volts from the temperature limit, the draft motor will perform a 25-second post-purge and the indoor blower will be de-energized following the elapse of the fan off delay for heating.

This limit is monitored regardless of unit operation status, i.e. this limit is monitored at all times.

If the temperature limit opens three times within one hour, it will lock-on the indoor blower motor and flash code is initiated (See Table 25).

Gas Valve

The UCB continuously monitors the GV. Any time the UCB senses voltage at the GV without a call for heat for a continuous five-minute period, the UCB will lock-on the indoor blower and a flash code is initiated (Table 25). When voltage is no longer sensed at the GV, the UCB will de-energize the indoor blower following the elapse of the fan off delay for heating.

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If voltage has been sensed at the GV for at least 15 seconds during the fan on delay for heating and GV voltage or “W1” is lost, the indoor blower is forced on for the length of the fan off delay for heating.

Safety Controls

The UCB monitors the temperature limit switch of gas heat units. The control circuit includes the following safety controls:

Limit Switch (LS)

This control is located inside the gas heat compartment and is set to open at the temperature indicated in the Gas Heat Limit Control Settings Table 22. It resets automatically. The limit switch operates when a high temperature condition, caused by inadequate supply air flow occurs, thus shutting down the heater and energizing the blower.

Centrifugal Switch (CS)

If the draft motor should fail, the centrifugal switch attached to the shaft of the motor prevents the ignition controls and gas valves from being energized.

Redundant Gas Valve

There are two separate gas valves in the furnace. Each valve contains a main and a redundant valve. The redundant valves are located upstream of the main gas valves. Should either or both of the main gas valves fail in the open position the redundant valves serve as back-ups and shut off the flow of gas.

Flame Sensor Rod / 100% Ignition Control Lock-Out.

The flame rods and controls are located per Proper Flame Adjustment Figure 24. If an ignition control fails to detect a signal from the flame sensor indicating the pilot flame is properly ignited, then the main gas valve will not open. It will continue to try and ignite the pilot for a maximum of 85 seconds, then if the pilot flame is not detected, the ignition control will lock out furnace operation until 24V power is removed from the module either at the unit or by resetting the room thermostat.

Rollout Switch

This switch is located above the main burners in the control compartment, which in the event of a sustained main burner rollout shuts off and locks out both ignition controls closing both gas valves. The ignition controls lock out furnace operation until 24V power is removed from the controls either at the unit or by resetting the room thermostat.

Auxiliary Limit Switch (AUX)

This control is located inside the heat exchanger compartment and is set to open at 190°F. It is a manual reset switch. If AUX trips, then the primary limit has not functioned correctly. Replace the primary limit.

Table 22: Gas Heat Limit Control Setting

Units

(Tons)

15, 17.5, 20 & 25 300 240 195 15, 17.5, 20 & 25 400 320 195

Capacity, MBH

Input Output

Limit Control

Opens, ºF

The ICB monitors the Pressure and Rollout switches of gas heat units.

The control circuit includes the following safety controls:

Ignitor Control #2

Ignitor Control #1

Rollout

Sensor #1

Ignitor #2

Switch

GV2 Gas

Valve

GV1 Gas

Valve

Ignitor #1

Sensor #2

Burner Compartment

Figure 23: Gas Valve and Controls Flash Codes

The UCB will initiate a flash code associated with errors within the system. Refer to UNIT CONTROL BOARD FLASH CODES Table 25.

Resets

Remove the call for heating by lowering the thermostat setting lower than the conditioned space temperature. This resets any flash codes.

Gas Heat Anticipator Setpoints

It is important that the anticipator setpoint be correct. Too high of a setting will result in longer heat cycles and a greater temperature swing in the conditioned space. Reducing the value below the correct setpoint will give shorter “ON cycles and may result in the lowering of the temperature within the conditioned space. Refer to Table 23 for the required gas heat anticipator setting.

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Table 23: Gas Heat Anticipator Setpoints

Gas Valve

VR8440

36C68

Anticipator Setpoint

1st Stage 2nd Stage

0.30 amp 0.11 amp

Start-Up (Cooling)

Prestart Check List

After installation has been completed:

1. Check the electrical supply voltage being supplied. Be sure that it is the same as listed on the unit nameplate.

2. Set the room thermostat to the off position.

3. Turn unit electrical power on.

4. Set the room thermostat fan switch to on.

5. Check indoor blower rotation.

• If blower rotation is in the wrong direction. Refer to

Phasing Section in general information section.

Check blower drive belt tension.

6. Check the unit supply air (CFM).

7. Measure evaporator fan motor's amp draw.

8. Set the room thermostat fan switch to off.

9. Turn unit electrical power off.

Operating Instructions

This furnace is equipped with an intermittent pilot and automatic re-ignition system. DO NOT attempt to manually light the pilot.

Lighting The Main Burners

1. Turn “OFF” electric power to unit.

2. Turn room thermostat to lowest setting.

3. Turn gas valve knob or switch to “ON” position (See Figure 26).

4. Turn “ON” electric power to unit.

5. Set room thermostat to desired temperature (If thermostat “set” temperature is above room temperature, pilot burner ignition will occur and, after an interval to prove pilot flame, main burners will ignite).

Post Start Checklist

After the entire control circuit has been energized and the heating section is operating, make the following checks:

1. Check for gas leaks in the unit piping as well as the supply piping.

Operating Instructions

1. Turn unit electrical power on.

2. Set the room thermostat setting to lower than the room temperature.

3. First stage compressors will energize after the built-in time delay (five minutes).

4. The second stage of the thermostat will energize second stage compressor if needed.

Post Start Check List

1. Verify proper system pressures for both circuits.

2. Measure the temperature drop across the evaporator coil.

3. Measure the system amperage draw across all legs of 3 phase power wires.

4. Measure the condenser fan amperage draw.

Start-Up (Gas Heat)

Pre-Start Check List

Complete the following checks before starting the unit.

1. Check the type of gas being supplied. Be sure that it is the same as listed on the unit nameplate.

2. Make sure that the vent and combustion hoods have been properly installed.

FIRE OR EXPLOSION HAZARD Failure to follow the safety warning exactly could result

in serious injury, death or property damage. Never test for gas leaks with an open flame. use a

commercially available soap solution made specifically for the detection of leaks to check all connections. A fire or explosion may result causing property damage, personal injury or loss of life.

2. Check for correct manifold gas pressures. (See CHECKING GAS INPUT.)

3. Check the supply gas pressure. It must be within the limits shown on the rating nameplate. Supply pressure should be checked with all gas appliances in the building at full fire. At no time should the standby gas pressure exceed 13 in. or the operating pressure drop below 5.0 in for natural gas units. If gas pressure is outside these limits, contact the local gas utility or propane supplier for corrective action.

Shut Down

1. Set the thermostat to the lowest temperature setting.

2. Turn “OFF” all electric power to unit.

3. Open gas heat access panel.

4. Turn gas valve clockwise to “OFF” position (See Figure 26).

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Checking Gas Heat Input

1. Turn off all other gas appliances connected to the gas meter.

2. With the furnace turned on, measure the time needed for one revolution of the hand on the smallest dial on the meter. A typical gas meter usually has a 1/2 or a 1 cubic foot test dial.

3. Using the number of seconds for each revolution and the size of the test dial increment, find the cubic feet of gas consumed per hour from the Gas Rate - Cubic Feet Per Hour Table 24.

If the actual input is not within 5% of the furnace rating (with allowance being made for the permissible range of the regulator setting), replace the orifice spuds with spuds of the proper size.

NOTE: To find the Btu input, multiply the number of cubic feet

of gas consumed per hour by the Btu content of the gas in your particular locality (contact your gas company for this information - it varies widely from city to city.).

Table 24: Gas Rate Cubic Feet Per Hour

Seconds for

One Rev.

4 450 900 6 300 600

8 228 450 10 180 360 12 150 300 14 129 257 16 113 225 18 100 200 20 90 180 22 82 164 24 75 150 26 69 138 28 64 129

Size of Test Dial

1/2 cu. ft. 1 cu. ft.

EXAMPLE By actual measurement, it takes 13 seconds for the hand on the

1-cubic foot dial to make a revolution with just a 300,000 Btuh furnace running. Read across to the column in the table above, headed “1 Cubic Foot”, where you will see that 278 cubic feet of gas per hour are consumed by the furnace at that rate. Multiply 278 x 1050 (the Btu rating of the gas obtained from the local gas company). The result is 292,425 Btuh, which is close to the 300,000 Btuh rating of the furnace.

Manifold Gas Pressure Adjustment

Small adjustments to the high-fire gas flow may be made by turning the pressure regulator adjusting screw on the automatic gas valve.

Adjust as follows:

1. Remove the cap on the regulator. It's located next to the push-on electrical terminals.

2. To decrease the gas pressure, turn the adjusting screw counterclockwise.

3. To increase the gas pressure, turn the adjusting screw clockwise.

NOTE: The correct manifold pressure for these furnaces is

3.65 IWG ± 0.3.

Adjustment Of Temperature Rise

The temperature rise (the difference of temperature between the return air and the heated air from the furnace) must lie within the range shown on the CSA rating plate and the data in Table 11.

After the temperature rise has been determined, the CFM can be calculated as follows:

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After about 20 minutes of operation, determine the furnace temperature rise. Take readings of both the return air and the heated air in the ducts (about 6 feet from the furnace) where they will not be affected by radiant heat. Increase the blower CFM to decrease the temperature rise; decrease the blower CFM to increase the rise (See SUPPLY AIR DRIVE ADJUSTMENT).

NOTE: Each gas heat exchanger size has a minimum

allowable CFM. Below this CFM, the limit will open.

Burner Assembly Bracket

Flame Sensor Bulb

1/8” Gap Between

Carry-over Tube

and Flame Sensor Bulb

Carry-over Tube

2. Open the union fitting in the gas supply line just upstream of the unit gas valve and downstream from the main manual shut-off valve.

3. Remove the gas piping closure panel.

4. Disconnect wiring to the gas valves and spark ignitors. Remove the manifold-burner gas valve assembly by lifting up and pulling back.

Adjustable Shutter

Gas Supply Pipe

Burner

Pilot Tube

Heat Tube

Exchanger

Burner Flame

(Blue Only)

Figure 25: Typical Flame

Burners are now accessible for service. Reverse the above procedure to replace the assemblies. Make

sure that burners are level and seat at the rear of the heat exchanger.

Burner Air Shutter Adjustment

Adjust burner shutters so no yellow flame is observed in the heat exchanger tubes.

Figure 24: Proper Pilot Flame Adjustment Pilot Checkout

The pilot flame should envelope the end of the flame sensor. To adjust pilot flame, (1) remove pilot adjustment cover screw, (2) increase or decrease the clearance for air to the desired level, (3) be sure to replace cover screw after adjustment to prevent possible gas leakage.

Put the system into operation and observe through complete cycle to be sure all controls function properly.

Burner Instruction

To check or change burners, pilot or orifices, CLOSE MAIN MANUAL SHUT-OFF VALVE AND SHUT OFF ALL ELECTRIC POWER TO THE UNIT.

1. Remove the screws holding either end of the manifold to the burner supports.

Figure 26: Typical Gas Valve

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Charging The Unit

349218-JIM-F-0512

15 Ton Charging Chart

500

480

460

440

420

400

380

360

340

320

300

Discharge Pressure (psig)

280

260

240

220

200

110 115 120 125 130 135 140 145 150 155 160 165 170

65°F

Outdoor

85°F

Outdoor

75°F

Outdoor

Suction Pressure (psig)

115°F

Outdoor

105°F

Outdoor

95°F

Outdoor

Figure 27: J15ZJ (15 Ton) Charging Chart

17.5 Ton Charging Chart

500

480

460

440

420

400

380

360

340

320

300

Discharge Pressure (psig)

280

260

240

220

200

110 115 120 125 130 135 140 145 150 155 160 165 170

75°F

Outdoor

65°F

Outdoor

85°F

Outdoor

Suction Pressure (psig)

115°F

Outdoor

105°F

Outdoor

95°F

Figure 28: J18ZJ (17.5 Ton) Charging Chart

20 Ton Charging Chart

500

480

460

440

420

400

380

360

340

320

300

Discharge Pressure (psig)

280

260

240

220

200

65°F

Outdoor

110 115 120 125 130 135 140 145 150 155 160 165 170

85°F

Outdoor

75°F

Outdoor

115°F

Outdoor

105°F

Outdoor

95°F

Outdoor

Suction Pressure (psig)

Figure 29: J20ZJ (20 Ton) Charging Chart

25 Ton Charging Chart

530

510

490

470

450

430

410

390

370

350

330

Discharge Pressure (psig)

310

290

270

250

230

95 100 105 110 115 120 125 130 135 140 145 150 155

Outdoor

85°F

Outdoor

75°F

Outdoor

65°F

115°F

Outdoor

105°F

Outdoor

95°F

Outdoor

Suction Pressure (psig)

Figure 30: J25ZJ (25 Ton) Charging Chart

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Troubleshooting

Troubleshooting of components may require opening the electrical control box with the power connected to the unit. Use extreme care when working with live circuits! Check the unit nameplate for the correct line voltage and set the voltmeter to the correct range before making any connections with line terminals.

For troubleshooting of optional VFD, disconnect all power to the drive. Be aware that high voltages are present in the drive even after power has been disconnected. Capacitors within the drive must be allowed to discharge before beginning service.

When not necessary, shut off all electric power to the unit prior to any of the following maintenance procedures so as to prevent personal injury.

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation which could cause injury to person and/or damage unit components. Verify proper operation after servicing.

Cooling Troubleshooting Guide

On calls for cooling, if the compressors are operating but the supply air blower motor does not energize after a short delay (the room thermostat fan switch is in the “AUTO” position):

1. Turn the thermostat fan switch to the ON position. If the supply air blower motor does not energize, go to Step 2.

2. If the supply air blower motor does not energize when the fan switch is set to ON, check that line voltage is being supplied to the contacts of the M3, contactor, and that the contactor is pulled in. For units with VFD, check that line voltage is being supplied to the M3-Auxiliary contacts Check for loose wiring between the contactor and the supply air blower motor.

3. If M3 is pulled in and voltage is supplied to M3, lightly touch the supply air blower motor housing. If it is hot, the motor may be off on internal protection. Cancel any thermostat calls and set the fan switch to AUTO. Wait for the internal overload to reset. Test again when cool.

4. If M3 is not pulled in, check for 24 volts at the M3 coil. If 24 volts are present at M3 but M3 is not pulled in, replace the contactor.

5. Failing the above, if there is line voltage supplied at M3, M3 is pulled in, and the supply air blower motor still does not operate, replace the motor.

For units with VFD, if there is line voltage supplied at M3, M3 is pulled in, and the blower motor does not operate, check all power & control wiring connections to and from

the drive and for any fault/warning messages displayed on the drive's digital display (refer to the drive user manual for full descriptions, if necessary). Clear any fault by pressing 'RESET' on the drive's keypad and take any corrective action as needed. If the motor still does not operate, replace the motor.

6. If 24 volts is not present at M3, check that 24 volts is present at the UCB supply air blower motor terminal, “FAN”. If 24 volts is present at the FAN, check for loose wiring between the UCB and M3.

7. If 24 volts is not present at the “FAN” terminal, check for 24 volts from the room thermostat. If 24 volts are not present from the room thermostat, check for the following:

a. Proper operation of the room thermostat (contact

between R and G with the fan switch in the ON position and in the AUTO position during operation calls).

b. Proper wiring between the room thermostat and the

UCB, and

c. Loose wiring from the room thermostat to the UCB

8. If 24 volts is present at the room thermostat but not at the UCB, check for proper wiring between the thermostat and the UCB, i.e. that the thermostat G terminal is connected to the G terminal of the UCB, and for loose wiring.

9. If the thermostat and UCB are properly wired, replace the UCB.

On calls for cooling, the supply air blower motor is operating but compressor #1 is not (the room thermostat fan switch is in the “AUTO” position):

1. If installed, check the position of the economizer blades. If the blades are open, the economizer is providing free cooling and the compressors will not immediately operate. If both stages of cooling are requested simultaneously and the economizer provides free cooling, following a short delay compressor #1 will be energized unless it is locked out. If compressor #1 is locked out, compressor #2 is energized. Compressor #2 is always energized in place of compressor #1 when compressor #1 is requested but locked out.

2. If no economizer is installed or the economizer is not opening to provide free cooling and compressor #1 does not energize on a call for cooling, check for line voltage at the compressor contactor, M1, and that the contactor is pulled in. Check for loose wiring between the contactor and the compressor.

3. If M1 is pulled in and voltage is supplied at M1, lightly touch the compressor housing. If it is hot, the compressor may be off on inherent protection. Cancel any calls for cooling and wait for the internal overload to reset. Test again when cool.

4. If M1 is not pulled in, check for 24 volts at the M1 coil. If 24 volts are present and M1 is not pulled in, replace the contactor.

5. Failing the above, if voltage is supplied at M1, M1 is pulled in, and the compressor still does not operate, replace the compressor.

6. If 24 volts is not present at M1, check for 24 volts at the UCB terminal, C1. If 24 volts is present, check for loose wiring between C1 and the compressor contactor.

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7. If 24 volts is not present at the C1 terminal, check for 24 volts from the room thermostat at the UCB Y1 terminal. If 24 volts is not present from the room thermostat, check for the following:

a. 24 volts at the thermostat Y1 terminal b. Proper wiring between the room thermostat and the

UCB, i.e. Y1 to Y1, Y2 to Y2, and

c. Loose wiring from the room thermostat to the UCB

8. If 24 volts is present at the UCB Y1 terminal, the compressor may be out due to an open high-pressure switch, low-pressure switch, or freezestat. Check for 24 volts at the HPS1, LPS1, and FS1 terminals of the UCB. If a switch has opened, there should be a voltage potential between the UCB terminals, e.g. if LPS1 has opened, there will be a 24-volt potential between the LPS1 terminals.

9. If 24 volts is present at the UCB Y1 terminal and none of the protection switches have opened, the UCB may have locked out the compressor for repeat trips. The UCB should be flashing an alarm code. If not, press and release the ALARMS button on the UCB. The UCB will flash the last five alarms on the LED. If the compressor is locked out, cancel any call for cooling. This will reset any compressor lock outs. If the LPS is still open after the ASCD, the compressor will not be energized for 30 seconds. The second and third times that the UCB sees an open LPS will count towards the three occurrences that will cause a UCB lock-out.

NOTE: While the above step will reset any lockouts,

compressor #1 may be held off for the ASCD. See the next step.

10. If 24 volts is present at the UCB Y1 terminal and none of the switches are open and the compressor is not locked out, the UCB may have the compressor in an ASCD. Check the LED for an indication of an ASCD cycle. The ASCD should time out within 5 minutes. Press and release the TEST button to reset all ASCDs.

11. If 24 volts is present at the UCB Y1 terminal and the compressor is not out due to a protective switch trip, repeat trip lock out, or ASCD, the economizer terminals of the UCB may be improperly wired. Check for 24 volts at the Y1 “OUT” terminal of the UCB. If 24 volts is present, trace the wiring from Y1 “OUT” for incorrect wiring. If 24 volts is not present at the Y1 “OUT” terminal, the UCB must be replaced.

12. For units without economizers: If 24 volts is present at the Y1 OUT terminal, check for 24 volts at the Y1 “ECON” terminal. If 24 volts is not present, check for loose wiring from the Y1 “OUT” terminal to the Mate-N-Lock plug, the jumper in the Mate-N-Lock plug, and in the wiring from the Mate-N-Lock plug to the Y1 “ECON” terminal.

13. For units with economizers: If 24 volts is present at the Y1 “OUT” terminal, check for 24 volts at the Y1 “ECON” terminal. If 24 volts is not present, check for loose wiring from the Y1 “OUT” terminal to the Mate-N-Lock plug, a poor connection between the UCB and economizer MateN-Lock plugs, loose wiring from the Mate-N-Lock plug to the economizer, back to the Mate-N-Lock plug, and from the Mate-N-Lock plug to the Y1 “ECON” terminal. If nothing is found, the economizer control may have faulted and is

failing to return the 24-volt “call” to the Y1 “ECON” terminal even though the economizer is not providing free cooling. To test, disconnect the Mate-N-Locks and jumper between the WHITE and YELLOW wires of the UCB’s Mate-N-Lock plug. If compressor #1 energizes, there is a fault in the economizer wiring or the economizer control.

14. The UCB can be programmed to lock out compressor operation during free cooling and in low ambient conditions. These options are not enabled by default. Local distributors can test the UCB for this programming.

For units with factory installed economizers, the UCB is programmed to lock out compressor operation when the LAS set point is reached.

For units without factory installed or with field installed economizers, the UCB allows compressor operation all the time. This programming can be checked or changed by the local distributor.

15. If none of the above corrected the error, test the integrity of the UCB. Disconnect the C1 terminal wire and jumper it to the Y1 terminal. DO NOT jump the Y1 to C1 terminals. If the compressor engages, the UCB has faulted.

16. If none of the above correct the error, replace the UCB.

On calls for the second stage of cooling, the supply air blower motor and compressor #1 are operating but compressor #2 is not (the room thermostat fan switch is in the “AUTO” position):

1. If installed, check the position of the economizer blades. If the blades are open, the economizer is providing free cooling. If the second stage of cooling is requested, following a short delay, compressor #1 will be energized unless it is locked out. Typically, compressor #2 is energized only during free cooling if the call for the second stage of cooling persists for 20 minutes.

2. Compressor #2 will not energize simultaneously with compressor #1 if a call for both stages of cooling is received. The UCB delays compressor #2 by 30 seconds to prevent a power surge. If after the delay compressor #2 does not energize on a second stage call for cooling, check for line voltage at the compressor contactor, M2, and that the contactor is pulled in. Check for loose wiring between the contactor and the compressor.

3. If M2 is pulled in and voltage is supplied at M2, lightly touch the compressor housing. If it is hot, the compressor may be off on inherent protection. Cancel any calls for cooling and wait for the internal overload to reset. Test again when cool.

4. If M2 is not pulled in, check for 24 volts at the M2 coil. If 24 volts is present and M2 is not pulled in, replace the contactor.

5. Failing the above, if voltage is supplied at M2, M2 is pulled in, and the compressor still does not operate, replace the compressor.

6. If 24 volts is not present at M2, check for 24 volts at the UCB terminal, C2. If 24 volts are present, check for loose wiring between C2 and the compressor contactor.

7. If 24 volts is not present at the C2 terminal, check for 24 volts from the room thermostat at the UCB Y2 terminal. If

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24 volts is not present from the room thermostat, check for the following:

a. 24 volts at the thermostat Y2 terminal b. Proper wiring between the room thermostat and the

UCB, i.e. Y1 to Y1, Y2 to Y2, and

c. Loose wiring from the room thermostat to the UCB

8. If 24 volts is present at the UCB Y2 terminal, the compressor may be out due to an open high-pressure switch, low-pressure switch, or freezestat. Check for 24 volts at the HPS2, LPS2, and FS2 terminals of the UCB. If a switch has opened, there should be a voltage potential between the UCB terminals, e.g. if LPS2 has opened, there will be 24 volts of potential between the LPS2 terminals.

9. If 24 volts is present at the UCB Y2 terminal and none of the protection switches have opened, the UCB may have locked out the compressor for repeat trips. The UCB should be flashing a code. If not, press and release the ALARMS button on the UCB. The UCB will flash the last five alarms on the LED. If the compressor is locked out,

remove any call for cooling at the thermostat or by disconnecting the thermostat wiring at the Y1, Y2, Y3 and Y4 on the UCB terminal. This will reset any compressor lock outs, except LPS lockouts these can only be reset by cycling power to UCB.

NOTE: While the above step will reset any lock outs,

compressor #1 will be held off for the ASCD, and compressor #2 may be held off for a portion of the ASCD. See the next step.

10. If 24 volts is present at the UCB Y2 terminal and none of the switches are open and the compressor is not locked out, the UCB may have the compressor in an ASCD. Check the LED for an indication of an ASCD cycle. The ASCD should time out within 5 minutes. Press and release the TEST button to reset all ASCDs.

11. The UCB can be programmed to lock out compressor operation during free cooling and in low ambient conditions. These options are not enabled by default. Local distributors can test the UCB for this programming.

For units with factory installed economizers, the UCB is programmed to lock out compressor operation when the LAS set point is reached.

For units without factory installed or with field installed economizers, the UCB allows compressor operation all the time. This programming can be checked or changed by the local distributor.

12. If none of the above corrected the error, test the integrity of the UCB. Disconnect the C2 terminal wire and jumper it to the Y2 terminal. DO NOT jump the Y2 to C2 terminals. If the compressor engages, the UCB has faulted.

13. If none of the above correct the error, replace the UCB.

On a call for cooling, the supply air blower motor and compressor #2 are operating but compressor #1 is not (the room thermostat fan switch is in the “AUTO” position):

1. Compressor #2 is energized in place of compressor #1 when compressor #1 is unavailable for cooling calls. Check

the UCB for alarms indicating that compressor #1 is locked out. Press and release the ALARMS button if the LED is not flashing an alarm.

2. Check for line voltage at the compressor contactor, M1, and that the contactor is pulled in. Check for loose wiring between the contactor and the compressor.

4. If M1 is not pulled in, check for 24 volts at the M1 coil. If 24 volts is present and M1 is not pulled in, replace the contactor.

5. Failing the above, if voltage is supplied at M1, M1 is pulled in, and the compressor still does not operate, replace the compressor.

6. If 24 volts is not present at M1, check for 24 volts at the UCB terminal, C1. If 24 volts is present, check for loose wiring between C1 and the compressor contactor.

7. If 24 volts is not present at the C1 terminal, check for 24 volts from the room thermostat at the UCB Y1 terminal. If 24 volts are not present at the UCB Y1 terminal, the UCB may have faulted. Check for 24 volts at the Y1 ECON terminal. If 24 volts is not present at Y1 “ECON”, the UCB has faulted. The UCB should de-energize all compressors on a loss of call for the first stage of cooling, i.e. a loss if 24 volts at the Y1 terminal.

8. If 24 volts are present at the UCB Y1 terminal, the compressor may be out due to an open high-pressure switch, low-pressure switch, or freezestat. Check for 24 volts at the HPS1, LPS1, and FS1 terminals of the UCB. If a switch has opened, there should be a voltage potential between the UCB terminals, e.g. if LPS1 has opened, there will be a 24-volt potential between the LPS1 terminals.

9. If 24 volts is present at the UCB Y1 terminal and none of the protection switches have opened, the UCB may have locked out the compressor for repeat trips. The UCB should be flashing a code. If not, press and release the ALARMS button on the UCB. The UCB will flash the last five alarms on the LED. If the compressor is locked out, remove any call for cooling. This will reset any compressor lock outs, except LPS lockouts. These can only be reset by cycling power to the UCB.

NOTE: While the above step will reset any lock outs,

compressor #2 will be held off for the ASCD, and compressor #1 may be held off for a portion of the ASCD. See the next step.

58 Johnson Controls Unitary Products

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terminal of the UCB. If 24 volts is present, trace the wiring from Y1 “OUT” for incorrect wiring. If 24 volts is not present at the Y1 “OUT” terminal, the UCB must be replaced.

12. For units without economizers: If 24 volts is present at the Y1 “OUT” terminal, check for 24 volts at the Y1 “ECON” terminal. If 24 volts is not present, check for loose wiring from the Y1 “OUT” terminal to the Mate-N-Lock plug, the jumper in the Mate-N-Lock plug, and in the wiring from the Mate-N-Lock plug to the Y1 “ECON” terminal.

For units with economizers: If 24 volts is present at the Y1 “OUT” terminal, check for 24 volts at the Y1 “ECON” terminal. If 24 volts is not present, check for loose wiring from the Y1 “OUT” terminal to the Mate-N-Lock plug, a poor connection between the UCB and economizer MateN-Lock plugs, loose wiring from the Mate-N-Lock plug to the economizer, back to the Mate-N-Lock plug, and from the Mate-N-Lock plug to the Y1 “ECON” terminal. The economizer control may have faulted and is not returning the 24 volts to the Y1 “ECON” terminal even though the economizer is not providing free cooling. To test the economizer control, disconnect the Mate-N-Locks and jumper between the WHITE and YELLOW wires of the UCB’s Mate-N-Lock plug.

13. The UCB can be programmed to lock out compressor operation during free cooling and in low ambient conditions. These options are not enabled by default. They can be checked by local distributors.

For units with factory installed economizers, the UCB is programmed to lock out compressor operation when the LAS set point is reached.

For units without factory installed or with field installed economizers, the UCB allows compressor operation all the time. This programming can be checked or changed by the local distributor.

14. If none of the above corrected the error, test the integrity of the UCB. Disconnect the C1 terminal wire and jumper it to the Y1 terminal. DO NOT jump the Y1 to C1 terminals. If the compressor engages, the UCB has faulted.

15. If none of the above correct the error, replace the UCB.

Gas Heat Troubleshooting Guide

On calls for heating, the draft motor operates and the furnace lights but the supply air blower motor does not energize after a short delay (the room thermostat fan switch is in “AUTO” position).

349218-JIM-F-0512

The furnace may shut down on a high temperature condition during the procedure. If this occurs, the UCB energize the supply air blower motor until the high temperature limit has reset. Caution should be used at all times as the supply air blower may energize regardless of the room thermostat fan switch position.

1. Place the thermostat fan switch in the “ON” position. If the supply air blower motor energizes, go to Step 9.

2. If the supply air blower motor does not energize when the fan switch is set to “ON,” check that line voltage is being supplied to the contacts of the M3 contactor, and that the contactor is pulled in. For units with VFD, check that line voltage is being supplied to the M3-Auxiliary contacts. Check for loose wiring between the contactor and the supply air blower motor.

3. If M3 is pulled in and voltage is supplied at M3, lightly touch the supply air blower motor housing. If it is hot, the motor may be off on inherent protection. Cancel any thermostat calls and set the fan switch to “AUTO”, wait for the internal overload to reset. Test again when cool.

4. If M3 is not pulled in, check for 24 volts at the M3 coil. If 24 volts is present at M3 but M3 is not pulled in, replace the contactor.

5. Failing the above, if there is line voltage supplied at M3, M3 is pulled in, and the supply air blower motor still does not operate, replace the motor.

For units with VFD, if there is line voltage supplied at M3, M3 is pulled in, and the blower motor does not operate, check all power & control wiring connections to and from the drive and for any fault/warning messages displayed on the drive's digital display (refer to the drive user manual for full descriptions, if necessary). Clear any fault by pressing 'RESET' on the drive's keypad and take any corrective action as needed. If the motor still does not operate, replace the motor.

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6. If 24 volts is not present at M3, check that 24 volts is present at the supply air blower motor terminal on the UCB. If 24 volts is present at the UCB terminal, check for loose wiring between the UCB and M3.

a. If 24 volts is not present at the UCB supply air blower

motor terminal, check for 24 volts from the room thermostat. If 24 volts is not present from the room thermostat, check for the following:

• Proper operation of the room thermostat (contact between R and G with the fan switch in the “ON” position and in the “AUTO” position during operation calls.)

• Proper wiring between the room thermostat and the UCB, and

• Loose wiring from the room thermostat to the UCB

7. If 24 volts is present at the room thermostat but not at the UCB, check for proper wiring between the thermostat and the UCB, i.e. that the thermostat G terminal is connected to the G terminal of the UCB, and for loose wiring.

8. If the thermostat and UCB are properly wired, replace the UCB.

9. If the blower motor runs with the fan switch in the “ON” position but does not run shortly after the furnace has ignited when the fan switch is in the “AUTO” position, check the room thermostat for contact between R and G during “W1” calls.

On calls for heating, the supply air blower operates but the draft motor does not (the room thermostat fan switch is in the “AUTO” position).

1. The draft motor has inherent protection. If the motor shell is hot to the touch, wait for the internal overload to reset.

2. If the motor shell is cold with the room thermostat calling for heat, check for line voltage at the motor's Mate-N-Lok connector attached to the evaporator partition. If line voltage is present, replace the draft motor.

3. If line voltage is not present, check for line voltage at the heat relay (RW1) contacts in the main control box and check to see if the (RW1) is pulled in.

4. If the (RW1) relay is pulled in, check for a loose line voltage connection.

5. If the (RW1) relay is not pulled in, check for 24 volts at the (RW1) coil. If 24 volts is present, replace the (RW1) relay. If 24 volts is not present, check for a loose 24 volt connection back to the relay board and check the connections from the room thermostat to the relay board. If all connections are correct, replace the relay board.

The draft motor runs but the furnace does not light and the sparker does not spark.

1. The ignition control (IC1, IC2) may be locked out due to either a flame roll out or 100% shut off. These safety features are described above. If lock-out has occurred, 24V must be removed from the ignition controls. This is done at the unit or by resetting the room thermostat. After resetting 24V, check for proper furnace operation. If lock-out continues to occur, locate the source of the problem and correct.

2. Check all 24 volt connections from the relay board to and in the gas heat section. Check low voltage connections to the (ETD) located in the control box.

3. If the furnace is hot, it may be out on an over-temperature condition, wait for limit reset.

4. If the furnace is cold, check for 24 volts at wire 241 attached to the electrical time delay (ETD) located in the main control box. If 24 volts is not found, replace the ETD.

5. 24 volts is found at wire 241, remove the wires attached to the (TDR) and with a VOM, check for continuity across contacts 1 and 2. If none is found, the (TDR) is open and must be replaced. If there is continuity, re-attach the wires.With the draft motor running, check for 24 volts at terminal 4 of (RW1-

2) and (RW2-1). If 24 volts is not present, the centrifugal switch (CS) has not closed or has gone bad. Check the line voltage to the unit - if it is correct, replace the draft motor. If line voltage is low, call the power company.

6. Check for 24V at terminal 2 of (RW1-2 and RW2-1). If 24V is not present, check for 24V at (RW1 and RW2) relay coils. If these relays are pulled in, then check for a loose connection at terminal 2 and terminal 4 of each relay. If no problem is found, then replace (RW1 and/or RW2) as required.

7. If 24 volts is present at the ignitor controls, check all control wiring at the ignitor controls and the high tension wire to the ignitors. Check that the ground wires from the ignitor controls, the gas valves and pilot burners are all intact and making good electrical connection. Check to make sure that the ceramic insulator on the pilot ignitors or sensors is not broken or cracked, if all are intact, replace the ignition control IC1 or IC2.

The draft motor runs and the ignitor sparks at the pilot burner but the pilot does not ignite and a gas odor is not detected at the draft motor outlet.

1. Check to make sure gas is being supplied to the unit. Make sure that the gas pressure to the unit is within the proper limits as described in the “POST START CHECK LIST” page 52 and that the pilot adjust screw is allowing some flow of gas as described in “PILOT CHECKOUT” page 54.

2. Check all wiring between the ignitor control and the gas valve. Check to make sure the ground connections are intact.

3. If the wiring is intact, check for 24 volts across terminals “PV” and “COMMON” on the ignitor control. If 24 volts is not present, replace the ignitor control.

4. If 24 volts is present, remove the pilot burner and remove the pilot orifice from the pilot burner. The orifice is removed in the direction opposite the flow of gas. Inspect the orifice for obstruction. If it is clear, replace the main gas valve.

The ignitor sparks at the pilot burner but the pilot does not ignite and a gas odor is detected at the draft motor outlet.

1. Adjust the pilot adjust screw on the gas valve as described in “PILOT CHECKOUT” page 54.

2. Check the supply pressure as described in “POST START CHECK LIST” page 52. Make adjustments as necessary.

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3. Check the pilot orifice for obstruction as described in paragraph above. Clean as needed but the problem should not be the gas valve.

The pilot burner ignites but the ignitor continues to spark and the main burners do not ignite.

1. Make the same checks and adjustment as described in “PILOT CHECKOUT” page 54.

2. Check the supply pressure as described in “POST START CHECK LIST” page 52. Make adjustments as necessary.

3. Make sure that the pilot burner is not bent or damaged.

4. Make sure that the ground connections at the pilot burner, gas valve and ignitor control are intact. Check the high tension wire for good electrical connection. If all are intact, replace the ignitor module.

The pilot burner lights and the spark stops but the main burners do not light.

1. Check electrical connections between the ignitor control and the gas valve. If intact, check for 24 volts across terminals “MV” and “COMMON” terminals. If no voltage detected, replace ignitor control. If voltage is present, replace gas valve.

Furnace lights with roll-out or one burner has delayed ignition.

1. Make sure that the pilot burner is aligned properly with the carryover as described in “PILOT CHECKOUT” page 54.

2. Make sure that the carryovers on adjoining burners are screwed fast and are level with respect to one another.

Main burners light but exhibit erratic flame characteristics.

1. Adjust air shutters as described in “BURNER AIR SHUTTER ADJUSTMENT” page 54.

2. Check the main burner orifices for obstruction and alignment. Removal procedure is described in BURNER INSTRUCTIONS page 54. Clean or replace burner orifices and burners as needed.

Unit Control Board Flash Codes

Various flash codes are utilized by the unit control board (UCB) to aid in troubleshooting. Flash codes are distinguished by the short on and off cycle used (approximately 200ms on and 200ms off). To show normal operation, the control board flashes a 1 second on, 1 second off “heartbeat” during normal operation. This is to verify that the UCB is functioning correctly. Do not confuse this with an error flash code. To prevent confusion, a 1-flash, flash code is not used.

Alarm condition codes are flashed on the UCB lower left Red LED, See Figure 31. While the alarm code is being flashed, it will also be shown by the other LEDs: lit continuously while the alarm is being flashed. The total of the continuously lit LEDs equates to the number of flashes, and is shown in the table. Pressing and releasing the LAST ERROR button on the UCB can check the alarm history. The UCB will cycle through the last five (5) alarms, most recent to oldest, separating each alarm flash code by approximately 2 seconds. Flash code 21 is a nonalarm condition but due to the space constraints of the UCB, will be indicated by the Red LED. In all other cases, a flashing Green LED will be used to indicate non-alarm conditions.

In some cases, it may be necessary to “zero” the ASCD for the compressors in order to perform troubleshooting. To reset all ASCDs for one cycle, press and release the UCB TEST/ RESET button once.

Flash codes that do and do not represent alarms are listed in Table 25.

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Table 25: Unit Control Board Flash Codes

Flash

Codes

Description

On Steady This is a Control Failure -----

1 Flash Not Applicable -----

2 Flashes Control waiting ASCD

3 Flashes HPS1 Compressor Lockout Off Off Off On On 4 Flashes HPS2 Compressor Lockout Off Off On Off Off 5 Flashes LPS1 Compressor Lockout Off Off On Off On 6 Flashes LPS2 Compressor Lockout Off Off On On Off 7 Flashes FS1 Compressor Lockout Off Off On On On 8 Flashes FS2 Compressor Lockout Off On Off Off Off 9 Flashes Ignition Control Locked Out / Ignition Control Failure Off On Off Off On

10 Flashes Compressors Locked Out on Low Outdoor Air Temperature

11 Flashes Compressors locked out because the Economizer is using free Cooling 12 Flashes Unit Locked Out due to Fan Overload Switch Failure Off On On Off Off 13 Flashes Compressor Held Off due to Low Voltage

14 Flashes EEPROM Storage Failure Off On On On Off 15 Flashes HPS3 Compressor Lockout Off On On On On 16 Flashes HPS4 Compressor Lockout On Off Off Off Off 17 Flashes LPS3 Compressor Lockout On Off Off Off On 18 Flashes LPS4 Compressor Lockout On Off Off On Off 19 Flashes FS3 Compressor Lockout On Off Off On On 20 Flashes FS4 Compressor Lockout On Off On Off Off 21 Flashes Compressor Off due to Low SAT

OFF No Power or Control Failure Off Off Off Off Off

1. Non-alarm conditions.

Green

LED 16

Red

LED 8

Red

LED 4

Red

Led 2

Flashing Off Off On Off

Flashing On Off On Off

Flashing On Off On On

Flashing On On Off On

On Off On Off On

Red

LED 1

Check

Alarm

History

Reset All ASCDs

For One Cycle

Non Alarm Condition Green LED Flashing

Current Alarm

Flashed Red LED

Figure 31: Unit Control Board

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Unit Control Board Option Setup

Option Byte Setup

• Enter the Option Setup mode by pushing the OPTION SETUP / STORE button, and holding it for at least 2 seconds.

• The green status LED (Option Byte) will be turned on and the red status LED (Heat Delay) is turned off.

• The 8, 4, 2 and 1 LEDs will then show the status of the 4 labeled options ((8) Fan Off at Heat Start, (4) Low

Ambient Lockout, (2) Free Cooling Lockout, and (1) Lead / Lag).

• Press the UP or Down button to change the LED status to correspond to the desired Option Setup.

• To save the current displayed value, push the OPTION SETUP / STORE button and hold it for at least 2 seconds. When the value is saved, the green LED will flash a few times and then normal display will resume.

NOTE: While in either Setup mode, if no buttons are pushed for

60 seconds, the display will revert to its normal display, exiting the Option Setup mode. When saving, the

control board only saves the parameters for the currently displayed mode (Option Byte or Heat Delay).

Heat Delay Setup

• Enter the Option Setup mode by pushing the OPTION SETUP / STORE button, and holding it for at least 2 seconds.

• The green status LED (Option Byte) will be turned on and the red status LED (Heat Delay) is turned off.

• Press the COMM SETUP / SELECT button to toggle into the Heat Delay Setup, the green LED will turn off and the red LED for Heat Delay will turn on.

• The 8, 4, 2 and 1 LEDs will then show the status of the Heat Delay, (See Table 26). Press the UP or Down button to change the LED status to correspond to the desired Heat Delay Value.

• To save the current displayed value, push the OPTION SETUP / STORE button and hold it for at least 2 seconds. When the value is saved, the red LED will flash a few times and then normal display will resume.

NOTE: While in either Setup mode, if no buttons are pushed for

60 seconds, the display will revert to its normal display, exiting the Option Setup mode. When saving, the

control board only saves the parameters for the currently displayed mode (Option Byte or Heat Delay).

Table 26: Heat Delay

Heat

Fan On

Delay

60 180 On On On On 60 90 On On On Off 60 60 On On Off On 60 30 On On Off Off 45 180 On Off On On 45 90 On Off On Off 45 60 On Off Off On 45 30 On Off Off Off 30 180 Off On On On 30 90 Off On On Off 30 60 Off On Off On 30 30 Off On Off Off

0 60 Off Off On On 0 30 Off Off On Off 0 10 Off Off Off On

Non-std Non-std Off Off Off Off

Heat

Fan Off

Delay

Red

LED 8

Red

LED 4

Red

LED 2

Red

LED 1

Optional VAV Control Board Flash Codes

Flash codes are also utilized by the VAV add-on board to aid in troubleshooting optional VAV applications. Flash codes are displayed by a red LED located near the center of the board using a short on/off cycle (approximately 200-ms on and 200ms off).

To verify that the board is functioning correctly, the LED will display a repetitive 1 second on, 1 second off "heartbeat". Do not confuse this "heartbeat" with the error flash codes shown in the table below. To prevent confusion, a 1-flash, flash code is not used.

Table 27: VAV Control Board Flash Codes

FLASH CODE DESCRIPTION

On Steady Control Failure

1 Flash Not Applicable 2 Flashes Loss of Communication with UCB 3 Flashes Space Sensor Failure 4 Flashes SAT Sensor Failure 5 Flashes RAT Sensor Failure 6 Flashes OAT Sensor Failure 7 Flashes OH Sensor Failure 8 Flashes RH Sensor Failure 9 Flashes IAQ Sensor Failure

10 Flashes OAQ Sensor Failure 11 Flashes APS Sensor Failure 12 Flashes Limit 2 Switch Open 13 Flashes Purge 14 Flashes VFD Input Failure 15 Flashes Dirty Filter Switch

OFF No Power or Control Failure

Johnson Controls Unitary Products

5005 York Drive

Norman, OK 73069

Johnson Controls R-410A, 20 J ZJ Series, ZJ SERIES Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

General

Installation

Limitations

Location

Rigging And Handling

Ductwork

Condensate Drain

Compressors

Filters

Power And Control Wiring

Optional Electric Heat

Optional Gas Heat

Options/Accessories

Economizer And Power Exhaust Set Point Adjustments

Optional BAS-Ready Economizer Power Exhaust Damper Set Point Adjustment

Optional Variable Air Volume (VAV)

Optional Hot Gas Bypass (HGBP)

Air Balance

Operation

Cooling Sequence Of Operation

No Outdoor Air Options

Cooling Operation Errors

Electric Heating Sequence Of Operations

Gas Heating Sequence Of Operations

Start-Up (Cooling)

Start-Up (Gas Heat)

Checking Gas Heat Input

Charging The Unit

Troubleshooting

Unit Control Board Option Setup

Option Byte Setup

Heat Delay Setup

Optional VAV Control Board Flash Codes