Johnson Controls R-410A Installation Manual
15 - 25 ton 60 hertz
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Also See for R-410A:
- Technical manual (128 pages) ,
- Installation manual (44 pages) ,
- Installation and operation manual (20 pages)
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R-410A
SERIES 20 J**ZJ
15 - 25 Ton
60 Hertz
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
Damper Set Point Adjustment. . . . . . . . . . . . . . . . . . . . . . 30
Optional Variable Air Volume (VAV) . . . . . . . . . . . . . . . . . 30
Optional Hot Gas Bypass (HGBP) . . . . . . . . . . . . . . . . . . 32
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
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
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
TABLE OF CONTENTS
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
LIST OF TABLES
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
16 Enthalpy Set Point Chart . . . . . . . . . . . . . . . . . . . . . . . . 33
17 Economizer Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
18 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
19 Altitude/Temperature Correction Factors . . . . . . . . . . . . 35
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
349218-JIM-F-0512
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Table of Contents
Related Manuals for Johnson Controls R-410A
Summary of Contents for Johnson Controls R-410A
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Page 1: Table Of Contents
R-410A SERIES 20 J**ZJ 15 - 25 Ton 60 Hertz TABLE OF CONTENTS General ......... . 2 Air Balance . -
Page 2: General
R-410A. If you are unsure, consult the equipment proven pilot. All gas heaters are shipped from the factory equipped manufacturer. Failure to use R-410A compatible servicing for natural gas use, but can be field converted to L.P./Propane with... - Page 3 Additional information is available in the following reference forms: • Technical Guide - J15 thru 25 ZJ/ZR/ZF, 349690 This system uses R-410A Refrigerant which operates at higher pressures than R-22. No other refrigerant may be • General Installation - J15 thru 25 ZJ, 349218 used in this system.
- Page 4 SS Drain Pan Product Category Johnson UNT 1126 Controller (N2 protocol), DFS, APS Z = A/C, Single Pkg., R-410A 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...
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Page 5: Installation
30°F. 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. Johnson Controls Unitary Products... - Page 6 Outdoor Fan #2 Outdoor Fan #1 Outdoor Fan #4 Outdoor Fan #3 Copper Tube/Aluminum Fin Condenser Coils Compressor #1 Compressor #4 Compressor #2 Compressor #3 High Efficiency Scroll Compressors Figure 1: J15 thru 25 ZJ Component Location Johnson Controls Unitary Products...
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Page 7: Location
If a unit is to be installed on a roof curb other than a varnishes, hydrochloric acid, cements and glues, Unitary Products roof curb, gasketing must be applied to antistatic fabric softeners for clothes dryers, masonry all surfaces that come in contact with the unit underside. acid washing materials. Johnson Controls Unitary Products... -
Page 8: Center Of Gravity
Center of Gravity 4 Point Load Location (lbs.) 6 Point Load Location (lbs.) Size (Tons) Shipping Operating J15ZJ 2614 2609 85.25 (15) J18ZJ 2670 2665 85.25 (17.5) J20ZJ 2702 2697 85.05 (20) J25ZJ 2788 2783 85.25 (25) Johnson Controls Unitary Products... -
Page 9: J15 Thru 25 Zj Unit Accessory Weights
1. One-inch Gas Piping NPT Required. 10.0 hp 2. Opening in the bottom to the unit can be located by the slice in the insulation. 15.0 hp Note: All entry holes should be sealed to prevent rain water entry into building. Johnson Controls Unitary Products... -
Page 10: J15 Thru 25 Zj Unit Dimensions Rear View
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. Replace the side supply and return air compartment panels. Johnson Controls Unitary Products... -
Page 11: J15 Thru 25 Zj Unit Clearances
• 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. Johnson Controls Unitary Products... -
Page 12: Ductwork
The covering an economizer or a motorized damper option. Refer to the over the mounting holes only need be removed. Do not Fixed Outdoor Damper Figure 9. remove the opening cover. Johnson Controls Unitary Products... -
Page 13: Condensate Drain
The scroll compressor used in this product is specifically replaced with same size and type. Dirty filters will reduce the designed to operate with R-410A Refrigerant and cannot be capacity of the unit and will result in frosted coils or safety interchanged. -
Page 14: Power And Control Wiring
Power wiring is brought into the unit through the side of the unit or the basepan inside the curb. TERMINAL BLOCK TB1 FACTORY OR FIELD GROUND SUPPLIED DISCONNECT THREE PHASE POWER SUPPLY Figure 11: Field Wiring Disconnect - Cooling Unit With/Without Electric Heat Johnson Controls Unitary Products... -
Page 15: Control Wire Sizes
Jumper is required for any combination of R, RC, or RH. OCC is an output from the thermostat to indicate the Occupied condition. X is an input to the thermostat to display Error Status conditions. Figure 12: Typical Field Wiring 24 Volt Thermostat Johnson Controls Unitary Products... -
Page 16: Electrical Data
191.2 (20) None 55.6 18.0 21.7 55.6 460-3-60 9.6 15.0 36.0 43.3 63.1 54.0 65.0 74.0 72.0 86.6 95.6 None 43.4 18.0 17.3 43.4 575-3-60 7.4 11.5 36.0 34.6 50.7 54.0 52.0 59.3 72.0 69.3 76.7 Johnson Controls Unitary Products... - Page 17 72.0 86.6 102.9 None 53.7 18.0 17.3 53.7 575-3-60 8.7 13.5 10.3 36.0 34.6 56.2 54.0 52.0 64.8 72.0 69.3 82.2 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Unitary Products...
- Page 18 203.7 (20) None 60.6 18.0 21.7 60.6 460-3-60 9.6 15.0 36.0 43.3 69.4 54.0 65.0 80.2 72.0 86.6 101.9 None 47.4 18.0 17.3 47.4 575-3-60 7.4 11.5 36.0 34.6 55.7 54.0 52.0 64.3 72.0 69.3 81.7 Johnson Controls Unitary Products...
- Page 19 72.0 86.6 109.1 None 57.7 18.0 17.3 57.7 575-3-60 8.7 13.5 10.3 36.0 34.6 61.2 54.0 52.0 69.8 72.0 69.3 87.2 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Unitary Products...
- Page 20 (20) None 58.5 18.0 21.7 58.5 460-3-60 9.6 15.0 10.0 36.0 43.3 66.6 54.0 65.0 77.5 72.0 86.6 99.1 None 45.9 18.0 17.3 45.9 575-3-60 7.4 11.5 36.0 34.6 53.6 54.0 52.0 62.2 72.0 69.3 79.5 Johnson Controls Unitary Products...
- Page 21 72.0 86.6 110.7 None 60.1 18.0 17.3 60.1 575-3-60 8.7 13.5 15.4 36.0 34.6 62.6 54.0 52.0 71.2 72.0 69.3 88.5 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Unitary Products...
- Page 22 (20) None 63.5 18.0 21.7 63.5 460-3-60 9.6 15.0 10.0 36.0 43.3 72.9 54.0 65.0 83.7 72.0 86.6 105.4 None 49.9 18.0 17.3 49.9 575-3-60 7.4 11.5 36.0 34.6 58.6 54.0 52.0 67.2 72.0 69.3 84.5 Johnson Controls Unitary Products...
- Page 23 72.0 86.6 117.0 None 64.1 18.0 17.3 64.1 575-3-60 8.7 13.5 15.4 36.0 34.6 67.6 54.0 52.0 76.2 72.0 69.3 93.5 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Unitary Products...
- Page 24 83.7 72.0 86.6 105.4 None 55.2 18.0 17.3 55.2 575-3-60 8.7 13.5 36.0 34.6 58.6 54.0 52.0 67.2 72.0 69.3 84.5 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Unitary Products...
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Page 25: J15 Thru 25 Zj Physical Data
Fins per inch Tube diameter (in.) Circuitry Type Split-face Split-face Split-face Split-face EVAPORATOR COIL DATA Face area (Sq. Ft.) Rows Fins per inch 13.5 13.5 13.5 13.5 Tube diameter Circuitry Type Split-face Split-face Split-face Split-face Refrigerant control Johnson Controls Unitary Products... -
Page 26: Optional Electric Heat
6000 6000 208/230-3-60 6000 6000 6000 6000 J20ZJ 460-3-60 6000 6000 6000 6000 (20) 600-3-60 6000 6000 6000 6000 208/230-3-60 7500 7500 7500 7500 J25ZJ 460-3-60 7500 7500 7500 7500 (25) 600-3-60 7500 7500 7500 7500 Johnson Controls Unitary Products... -
Page 27: Optional Gas Heat
8750 6000 8750 J20ZJ 6000 9400 6000 9400 (20) 6000 9400 6000 9400 Main 7500 12500 7500 12500 J25ZJ Manual (25) 7500 12500 7500 12500 Shut-off Valve Drip Leg Figure 13: External Supply Connection External Shut-Off Johnson Controls Unitary Products... - Page 28 LP. Shellac base personal injury or loss of life. compounds such as Gaskolac or Stalastic, and compounds such as Rectorseal #5, Clyde’s, or John Crane may be used. Johnson Controls Unitary Products...
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Page 29: Options/Accessories
Enthalpy Set Point Adjustment Figure 16. Adjust as follows: Figure 15: Vent and Combustion Air Hood • For a single enthalpy operation carefully turn the set point adjusting screw (found on the damper control Johnson Controls Unitary Products... -
Page 30: Optional Bas-Ready Economizer Power Exhaust Damper Set Point Adjustment
(VFD) is available for applications requiring a constant • ST - analog input provided by field-installed space supply duct static pressure. A differential pressure transducer is temperature sensor. used to monitor supply duct static pressure and return a speed Johnson Controls Unitary Products... - Page 31 LINE (BYPASS) position. If there is a call for the motor will be shutdown. fan, the indoor blower motor will run at full-speed while in the bypass mode. Johnson Controls Unitary Products...
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Page 32: Optional Hot Gas Bypass (Hgbp)
• LR '4' to UCB 'C' 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. Johnson Controls Unitary Products... -
Page 33: Enthalpy Set Point Chart
Screw Indoor Air Quality Max. Adjustment Screw Indoor Air Quality Indoor Air Quality Min. Adjustment Screw Free Cool Free Cooling LED Economizer Enthalpy Set Point Adjustment Screw Figure 17: Economizer Control (Excludes VFD and BAS Options) Johnson Controls Unitary Products... -
Page 34: Belt Adjustment
349218-JIM-F-0512 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 Procedure for adjusting belt tension: electrical connection to the unit is misphased. Change the 1. -
Page 35: Altitude/Temperature Correction Factors
This value must be corrected for elevation. 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 BHP at 5,000 ft. = 3.2 x .832 = 2.66 Johnson Controls Unitary Products... - Page 36 Size Motor Blower 6 Turns 5 Turns 4 Turns 3 Turns 2 Turns 1 Turn Fully Model (Tons) Sheave Sheave Open Open Open Open Open Open Closed 5.75 1VP60 BK110 8.63 1VP60 BK090 1035 1075 1120 Johnson Controls Unitary Products...
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Page 37: Air Flow Performance - Side Duct Application
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. Johnson Controls Unitary Products... - Page 38 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. Johnson Controls Unitary Products...
- Page 39 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. Johnson Controls Unitary Products...
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Page 40: Air Flow Performance - Bottom Duct Application
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. Johnson Controls Unitary Products... - Page 41 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. Johnson Controls Unitary Products...
- Page 42 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. Johnson Controls Unitary Products...
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Page 43: Air Balance
To assure a dry coil, the compressors should someone other than the equipment installer. be deactivated while the test is being run. Johnson Controls Unitary Products... -
Page 44: Pressure Drop Across A Dry Indoor Coil Vs. Supply
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. Johnson Controls Unitary Products... -
Page 45: Operation
R - OCC on the VAV add- Computer running Windows software with a standard USB on board to put the unit into 'Occupied' Mode. Additionally, the port. unit can be switched between Unoccupied/Occupied mode Johnson Controls Unitary Products... -
Page 46: No Outdoor Air Options
Free-cooling is available if the outdoor air temperature meets position. If the enthalpy of the outdoor air is below the set point one of the three criteria discussed below, based upon the unit's of the enthalpy controller (previously determined), “Y1” configuration. Johnson Controls Unitary Products... -
Page 47: Cooling Operation Errors
UCB will lock-out the associated compressor on the position of the economizer actuator's auxiliary switch and flash a code (Table 25). If the other compressor is inactive, adjustment screw. The adjustment screw represents the outdoor the condenser fans will be de-energized. Johnson Controls Unitary Products... -
Page 48: Electric Heating Sequence Of Operations
(7M) will be energized. Note that on the 54 KW, 240V valve of gas furnace units. heater, heater contactors (7M & 8M) will be energized and Johnson Controls Unitary Products... -
Page 49: Electric Heat Operation Errors
0.29 Voltage (Tons) 1, 2 3, 4, 5, 6 0.29 0.29 575-3-60 ° ° Opens, Opens, 0.29 0.29 0.29 0.29 Gas Heating Sequence Of Operations The following sequence describes the operation of the gas heat section. Johnson Controls Unitary Products... -
Page 50: Gas Heating Operation Errors
GV, the UCB will de-energize the indoor blower maximum of 85 seconds to ignite the pilot tube. If the pilot flame following the elapse of the fan off delay for heating. is not detected, then “IC2” will lock out first stage furnace Johnson Controls Unitary Products... -
Page 51: Gas Heat Anticipator Setpoints
Refer to Table 23 for the required gas heat and is set to open at 190°F. It is a manual reset switch. If AUX anticipator setting. trips, then the primary limit has not functioned correctly. Replace the primary limit. Johnson Controls Unitary Products... -
Page 52: Start-Up (Cooling)
Turn “OFF” all electric power to unit. same as listed on the unit nameplate. Open gas heat access panel. Make sure that the vent and combustion hoods have been Turn gas valve clockwise to “OFF” position (See Figure 26). properly installed. Johnson Controls Unitary Products... -
Page 53: Checking Gas Heat Input
CSA rating plate and the data in Table 11. After the temperature rise has been determined, the CFM can be calculated as follows: Johnson Controls Unitary Products... -
Page 54: Typical Flame
Figure 26: Typical Gas Valve To check or change burners, pilot or orifices, CLOSE MAIN MANUAL SHUT-OFF VALVE AND SHUT OFF ALL ELECTRIC POWER TO THE UNIT. Remove the screws holding either end of the manifold to the burner supports. Johnson Controls Unitary Products... -
Page 55: Charging The Unit
100 105 110 115 120 125 130 135 140 145 150 155 110 115 120 125 130 135 140 145 150 155 160 165 170 Suction Pressure (psig) Suction Pressure (psig) Figure 30: J25ZJ (25 Ton) Charging Chart Figure 28: J18ZJ (17.5 Ton) Charging Chart Johnson Controls Unitary Products... -
Page 56: Troubleshooting
M3 is pulled in, and the blower motor does not operate, UCB terminal, C1. If 24 volts is present, check for loose check all power & control wiring connections to and from wiring between C1 and the compressor contactor. Johnson Controls Unitary Products... - Page 57 If 24 volts is not present at the C2 terminal, check for 24 the Mate-N-Lock plug to the Y1 “ECON” terminal. If nothing volts from the room thermostat at the UCB Y2 terminal. If is found, the economizer control may have faulted and is Johnson Controls Unitary Products...
- Page 58 Compressor #2 is energized in place of compressor #1 trip lock out, or ASCD, the economizer terminals of the UCB when compressor #1 is unavailable for cooling calls. Check may be improperly wired. Check for 24 volts at the Y1 “OUT” Johnson Controls Unitary Products...
- Page 59 If the motor still does not operate, short delay (the room thermostat fan switch is in “AUTO” replace the motor. position). Johnson Controls Unitary Products...
- Page 60 “PILOT CHECKOUT” page 54. for proper furnace operation. If lock-out continues to occur, Check the supply pressure as described in “POST START locate the source of the problem and correct. CHECK LIST” page 52. Make adjustments as necessary. Johnson Controls Unitary Products...
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Page 61: Unit Control Board Flash Codes
ASCDs for one cycle, press and release the UCB TEST/ RESET button once. Adjust air shutters as described in “BURNER AIR SHUTTER ADJUSTMENT” page 54. Flash codes that do and do not represent alarms are listed in Table 25. Johnson Controls Unitary Products... -
Page 62: Unit Control Board
Compressor Off due to Low SAT No Power or Control Failure 1. Non-alarm conditions. 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 Johnson Controls Unitary Products... -
Page 63: Unit Control Board Option Setup
15 Flashes Dirty Filter Switch No Power or Control Failure Subject to change without notice. Printed in U.S.A. 349218-JIM-F-0512 Copyright © 2012 by Johnson Controls, Inc. All rights reserved. Supersedes: 349218-JIM-F-0112 Johnson Controls Unitary Products 5005 York Drive Norman, OK 73069...
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