Table of Contents
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R-410A
J**ZJ SERIES W/SMART EQUIPMENT™
3 - 5 Ton
60 Hertz
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Preceding Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Side Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Power And Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 17
Optional Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Optional Gas Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Options/Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Economizer Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Dry Bulb Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Single Enthalpy Changeover. . . . . . . . . . . . . . . . . . . . . . . 31
Dual Enthalpy Changeover . . . . . . . . . . . . . . . . . . . . . . . . 31
1 JA3 thru A5ZJ Unit Limitations . . . . . . . . . . . . . . . . . . . . . 7
2 Weights and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 JA3 thru A5ZJ Unit Accessory Weights . . . . . . . . . . . . . . 8
4 JA3 thru A5ZJ Unit Physical Dimensions . . . . . . . . . . . . 11
5 JA3 thru A5ZJ Unit Clearances . . . . . . . . . . . . . . . . . . . . 11
6 Side Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7 Left/End Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . 14
8 Control Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
10 Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
11 Electric Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . 27
12 Gas Pipe Sizing - Capacity of Pipe . . . . . . . . . . . . . . . . . 28
13 Gas Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . . . 29
14 Smart Equipment™ Economizer Board Details . . . . . . . 33
15 Supply Air Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
1 Unit Shipping Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Condenser Covering . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Compressor Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Component Location (JA3ZJ Shown) . . . . . . . . . . . . . . . 6
5 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Unit 6 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Center of Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
8 JA3 thru A4ZJ Physical Dimensions . . . . . . . . . . . . . . . . 9
9 JA5ZJ Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . 10
10 JA3 thru A5ZJ Unit Bottom Duct Openings . . . . . . . . . . 12
11 JA3 thru A5ZJ Unit Electrical Entry . . . . . . . . . . . . . . . . 13
12 JA3 thru A5ZJ Unit Side Duct Openings . . . . . . . . . . . . 13
13 JA3 thru A5ZJ Unit Left/End Duct Opening . . . . . . . . . . 14
14 JA3 thru A5ZJ Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . 14
15 JA3 thru A5ZJ Transition Roof Curb . . . . . . . . . . . . . . . 15
16 Side Panels With Hole Plugs . . . . . . . . . . . . . . . . . . . . . 15
TABLE OF CONTENTS
Auto. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Free Cooling Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Power Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Airflow Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Air Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Checking Air Quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . 46
Cooling Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . 46
Electric Heating Sequence Of Operations . . . . . . . . . . . . 47
Electric Heat Operation Errors . . . . . . . . . . . . . . . . . . . . 48
Gas Heating Sequence Of Operations . . . . . . . . . . . . . . . 49
Gas Heating Operation Errors . . . . . . . . . . . . . . . . . . . . 49
Start-Up (Cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Start-Up (Gas Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Checking Gas Heat Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Charging The Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Control Board Navigation Components . . . . . . . . . . . . . . . . . 54
Start-Up Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
LIST OF TABLES
16 Altitude/Temperature Correction Factors . . . . . . . . . . . . 37
17 Airflow Performance - Side Duct Application . . . . . . . . . 40
18 Airflow Performance - Bottom Duct Application . . . . . . . 41
19 RPM Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
20 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . 42
21 Power Exhaust Specifications . . . . . . . . . . . . . . . . . . . . 42
22 Motor Sheave Datum Diameters . . . . . . . . . . . . . . . . . . 44
23 Additional Static Resistance . . . . . . . . . . . . . . . . . . . . . . 45
24 Electric Heat Limit Setting . . . . . . . . . . . . . . . . . . . . . . . . 48
25 Electric Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . 48
26 Gas Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . . 50
27 Gas Rate Cubic Feet Per Hour . . . . . . . . . . . . . . . . . . . . 52
28 Gas Heat Stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
29 Smart Equipment™ UCB Details . . . . . . . . . . . . . . . . . . 55
31 Ignition Control Flash Codes . . . . . . . . . . . . . . . . . . . . . 60
LIST OF FIGURES
17 Return Downflow Plenum With Panel . . . . . . . . . . . . . . 16
18 Discharge Panel In Place . . . . . . . . . . . . . . . . . . . . . . . . 16
19 Save Side Panels For Economizer Hood Tops . . . . . . . 16
20 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
21 Field Wiring Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . 18
22 Typical Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . 19
23 Side Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . 28
24 Bottom Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . 28
25 SE-ECO1001-0 Economizer Controller . . . . . . . . . . . . . 33
26 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
27 Altitude/Temperature Correction Factors . . . . . . . . . . . . 38
28 Dry Coil Delta P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
29 Typical Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
30 Typical Two Stage Gas Valve . . . . . . . . . . . . . . . . . . . . 53
31 Typical Single Stage Gas Valve . . . . . . . . . . . . . . . . . . . 54
32 Unit Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
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Table of Contents
Related Manuals for Johnson Controls J ZJ Series
Summary of Contents for Johnson Controls J ZJ Series
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Page 1: Table Of Contents
R-410A J**ZJ SERIES W/SMART EQUIPMENT™ 3 - 5 Ton 60 Hertz TABLE OF CONTENTS General ......... . 2 Auto. -
Page 2: General
5565593-JIM-B-1019 General Johnson Controls J**ZJ units are single package air conditioners with optional gas heating designed for outdoor Before performing service or maintenance operations on installation on a rooftop or slab and for non-residential use. unit, turn off main power switch to unit. Electrical shock These units can be equipped with factory or field installed could cause personal injury. - Page 3 Renewal Parts As soon as a unit is received, it should be inspected for possible For authorized replacement parts, call Johnson Controls, Inc. damage during transit. If damage is evident, the extent of the National Source 1 Parts Outlet at 1-866-523-9670.
- Page 4 5565593-JIM-B-1019 Nomenclature ® 3-5 Ton J**ZJ Johnson Controls Model Number Nomenclature JA3 ZJ C A 2 A 1 Product Generation Nominal Cooling Capacity 2 = Second Generation JA3 = 3 Ton JA4 = 4 Ton Cabinet Options JA5 = 5 Ton...
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Page 5: Installation
230v and 415v power supply respectively. Change Figure 1: Unit Shipping Bracket tap on transformer for 208-3-60 or 380-3-50 operation. See unit wiring diagram. Turn each bracket toward the ground and the protective plywood covering will drop to the ground. Johnson Controls Ducted Systems... -
Page 6: Limitations
Side entry power maintain warm, comfortable and control wiring temperature Compressor access Slide-out drain pan knockouts with 1" NPT Intelligent control board connection for safe and efficient Toolless door operation latch Figure 4: Component Location (JA3ZJ Shown) Johnson Controls Ducted Systems... -
Page 7: Location
Installer must make provisions for adequate LENGTH OF FORKS MUST BE A MINIMUM OF 60 INCHES. combustion and ventilation air in accordance with section 5.3 of Air for Combustion and Ventilation of the National Fuel Gas Johnson Controls Ducted Systems... -
Page 8: Weights And Dimensions
Unit Accessory Shipping Operating Economizer Power Exhaust Electric Heat Gas Heat 1. Weight given is for the maximum heater size available (24KW). 2. Weight given is for the maximum number of tube heat exchangers available (8 tube). Johnson Controls Ducted Systems... -
Page 9: Ja3 Thru A4Zj Physical Dimensions
5565593-JIM-B-1019 29.75 15.51 29.52 59.00 Ø 25.31 See detail A for gas inlet 11 3/8 See detail B for drain location LEFT 4 3/16 FRONT 21 3/16 27 5/16 Figure 8: JA3 thru A4ZJ Physical Dimensions Johnson Controls Ducted Systems... -
Page 10: Ja5Zj Physical Dimensions
5565593-JIM-B-1019 29.69 15.25 15.38 59.00 15.38 2X Ø 24.38 SEE DETAIL A FOR GAS INLET 11.38 SEE DETAIL B 59.00 4.19 FOR DRAIN LOCATION LEFT 27.31 21.19 89.00 FRONT Figure 9: JA5ZJ Physical Dimensions Johnson Controls Ducted Systems... -
Page 11: Ja3 Thru A5Zj Unit Physical Dimensions
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. Johnson Controls Ducted Systems... -
Page 12: Ja3 Thru A5Zj Unit Bottom Duct Openings
14 1/2 25 9/16 Bottom gas supply entry 16 3/8 18 1/16 FRONT TOP VIEW Bottom power, control and convenience outlet wiring entry 3X Ø 0.875 Ø 2.469 Figure 10: JA3 thru A5ZJ Unit Bottom Duct Openings Johnson Controls Ducted Systems... -
Page 13: Side Duct Dimensions
Figure 12: JA3 thru A5ZJ Unit Side Duct Openings Table 6: Side Duct Dimensions Dimension (in.) Unit Model Number JA3ZJ 27 3/4 12 1/16 27 1/2 JA4ZJ 27 3/4 12 1/16 27 1/2 JA5ZJ 27 3/4 12 1/16 27 1/2 Johnson Controls Ducted Systems... -
Page 14: Left/End Duct Dimensions
JA4ZJ 30.357 13.365 22.516 JA5ZJ 30.357 13.365 22.516 RIGHT 80-5/8 INSULATED DECK UNDER CONDENSER SECTION SUPPLY RETURN 2 TYP. 50-1/2 INSULATED DECK UNDER COMPRESSOR SECTION FRONT 8 or 14 Figure 14: JA3 thru A5ZJ Roof Curb Johnson Controls Ducted Systems... -
Page 15: Ductwork
Figure 16: Side Panels With Hole Plugs the supply panel is installed with the painted surface UP, facing the heat exchanger, while the return panel is installed with the NOTE: Orientation. Panel is “insulation” side up. Johnson Controls Ducted Systems... -
Page 16: Side Panels
POE oil in the system. This type of oil is highly susceptible to moisture absorption Figure 19: Save Side Panels For Economizer Hood Tops POE (polyolester) compressor lubricants are known to cause long term damage to some synthetic roofing materials. Johnson Controls Ducted Systems... -
Page 17: Filters
A disconnect must be utilized for these units. Factory installed disconnects are available. If installing a disconnect (field supplied or Johnson Controls supplied accessory), refer to Figure 4 for the recommended mounting location. Do not loosen compressor mounting bolts. -
Page 18: Field Wiring Disconnect
Refer to Electrical Data Table 9 to size power or the basepan inside the curb. wiring, fuses, and disconnect switch. TERMINAL BLOCK TB1 FACTORY OR FIELD GROUND SUPPLIED DISCONNECT THREE PHASE POWER SUPPLY Figure 21: Field Wiring Disconnect Johnson Controls Ducted Systems... -
Page 19: Control Wire Sizes
Jumper is required for any co of R, RC, or RH. OCC is an output from the thermostat to indicate the Occupied X is an input to the thermostat to display Error Status condi ons. Figure 22: Typical Control Wiring Johnson Controls Ducted Systems... -
Page 20: Electrical Data
24.1 33.4 36.1 28.9 39.4 42.1 None 11.5 13.4 15.6 39.5 0.66 14.4 20.5 22.8 19.2 26.5 28.8 23.1 31.4 33.6 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Ducted Systems... - Page 21 29.5 24.1 34.4 37.1 28.9 40.4 43.1 None 10.1 11.9 13.9 16.1 39.5 0.66 14.4 23.3 19.2 29.3 23.1 31.9 34.1 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Ducted Systems...
- Page 22 39.6 42.4 28.9 45.6 48.4 None 13.7 15.5 18.4 20.6 39.5 0.66 14.4 25.5 27.8 19.2 31.5 33.8 23.1 36.4 38.6 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Ducted Systems...
- Page 23 35.8 24.1 40.6 43.4 28.9 46.6 49.4 None 14.1 15.9 18.9 21.1 39.5 0.66 14.4 28.3 19.2 34.3 23.1 36.9 39.1 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Ducted Systems...
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Page 24: Physical Data
Fins per inch Tube diameter (in./MM) .71/18 .71/18 .71/18 Circuitry Type 2-pass Microchannel 2-pass Microchannel 2-pass Microchannel EVAPORATOR COIL DATA Face area (Sq. Ft.) 10.5 10.5 Rows Fins per inch Tube diameter 0.375 0.375 0.375 Refrigerant control Johnson Controls Ducted Systems... - Page 25 4 - (24 x 16 x 4) 1. JA3ZJ, JA4ZJ, JA5ZJ have crankcase heaters standard. 2. 2 In. Throwaway, Standard, MERV (Minimum Efficiency Reporting Value) 3. 3. 2 In. Pleated, Optional, MERV 8. 4. 4 In. Pleated, Optional, MERV 13. Johnson Controls Ducted Systems...
- Page 26 Fins per inch Tube diameter (in./MM) .71/18 .71/18 .71/18 Circuitry Type 2-pass Microchannel 2-pass Microchannel 2-pass Microchannel EVAPORATOR COIL DATA Face area (Sq. Ft.) 10.5 10.5 Rows Fins per inch Tube diameter 0.375 0.375 0.375 Refrigerant control Johnson Controls Ducted Systems...
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Page 27: Optional Electric Heat
208/230-3-60 1020 1000 460-3-60 600-3-60 208/230-3-60 1280 1420 1400 1400 460-3-60 1400 1400 1400 1400 600-3-60 1400 1400 1400 208/230-3-60 1600 1600 1600 1600 1600 460-3-60 1600 1600 1600 1600 1600 600-3-60 1600 1600 1600 1600 Johnson Controls Ducted Systems... -
Page 28: Optional Gas Heat
NOTE: There may be a local gas utility requirement specifying a minimum diameter for gas piping. All units require a 3/4 inch pipe connection at the entrance fitting. Line should not be sized smaller than the entrance fitting size. Johnson Controls Ducted Systems... -
Page 29: Gas Heat Minimum Supply Air
Check all joints for leaks with soap solution or other material suitable for the purpose. NEVER USE A FLAME. All LP gas equipment must conform to the safety standards of the National Fire Protection Association. Johnson Controls Ducted Systems... -
Page 30: Options/Accessories
For specific troubleshooting and maintenance procedures, please refer to the smoke detector's installation Electric Heat instructions which accompanies the unit. Electric heaters are available as factory-installed options or field-installed accessories. Refer to electric heat instructions for Johnson Controls Ducted Systems... -
Page 31: Economizer Sequences
When the control determines that the outside air is suitable, the the damper is set proportionally between the "Economizer first stage of cooling will always be free cooling. Minimum Position and the Economizer Minimum Position Low Johnson Controls Ducted Systems... -
Page 32: Power Exhaust
Economizer Damper Position For Exhaust Fan On. is less than Economizer Setpoint -1°F, the control starts a 12- c. De-energizes exhaust fan when economizer output is minute timer to de-energize a compressor output. below the Economizer Damper Position for Exhaust Fan Johnson Controls Ducted Systems... -
Page 33: Smart Equipment™ Economizer Board Details
Negative of the SA BUS communication Common for SA BUS power and circuit to the UCB. Through the unit wiring harness, may continue communication circuits on to the 4-stage board and/or fault detection & diagnostics board Johnson Controls Ducted Systems... - Page 34 24V~ IN Pin connections at right on upper edge of economizer board 24 VAC common connection to power the economizer board. 24 VAC transformer Common referenced to Connects through circuit traces to C/COM terminals and pins cabinet ground distributed on the economizer board. Johnson Controls Ducted Systems...
- Page 35 Connects through circuit trace to 24V~ IN pin HOT sensor BldgPres parameter reports input status (-.250-.250”/w/-.062- BLDG 0-5 VDC positive input from the Building .062kPa). Used for modulating power exhaust functions when PRES Pressure sensor ExFType selection is Modulating Damper or Variable Frequency Fan. Johnson Controls Ducted Systems...
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Page 36: Supply Air Limitations
J**ZJ units are properly phased at the factory. Check for proper JA4 (4.0) 1200 2000 compressor rotation. If the blower or compressors rotate in the JA5 (5.0) 1500 2500 wrong direction at start-up, the electrical connection to the unit Johnson Controls Ducted Systems... -
Page 37: Altitude/Temperature Correction Factors
0.743 0.715 0.688 0.982 0.947 0.913 0.880 0.848 0.817 0.787 0.758 0.730 0.702 0.676 0.964 0.929 0.897 0.864 0.833 0.802 0.772 0.744 0.716 0.689 0.663 0.946 0.912 0.880 0.848 0.817 0.787 0.758 0.730 0.703 0.676 0.651 Johnson Controls Ducted Systems... -
Page 38: 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 1,400 CFM at a static pressure of 1.5". Use the unit BHP at 5,000 ft. = 0.7 x .832 = 0.58 Johnson Controls Ducted Systems... - Page 39 5 Turns 4 Turns 3 Turns 2 Turns 1 Turn Fully Model (Tons) Sheave Sheave Open Open Open Open Open Open Closed 1.73 1VL40 AK61 1029 1089 2.30 1VP56 AK74 1035 1084 1134 1183 1232 1281 Johnson Controls Ducted Systems...
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Page 40: Airflow Performance
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 0.932. 4. Field Supplied Drive. Johnson Controls Ducted Systems... -
Page 41: Airflow 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 0.932. Johnson Controls Ducted Systems... -
Page 42: Air Balance
Tighten blower pulley and motor sheave set screws after Remove the dot plugs from the duct panel (for location of any adjustments. Re-check set screws after 10-12 hrs. run the dot plugs see Figures 12 and 13). time is recommended. Johnson Controls Ducted Systems... -
Page 43: Dry Coil Delta P
Determine the number of turns the variable motor sheave is open. 0.45 JA4ZJ JA5ZJ 0.35 0.25 JA3ZJ 0.15 0.05 1000 1500 2000 2500 3000 3500 Air ow (CFM) Figure 28: Dry Coil Delta P Johnson Controls Ducted Systems... -
Page 44: Motor Sheave Datum Diameters
CFM. Adjustments of the blower speed and belt tension are REQUIRED. Verify proper sheave alignment; tighten blower pulley and motor sheave set screws after these adjustments. Re-checking set screws after 10-12 hrs. run time is recommended. Johnson Controls Ducted Systems... -
Page 45: Additional Static Resistance
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 Ducted Systems... -
Page 46: Operation
During cooling operation, if a high-pressure limit switch opens, economizer. The dampers will modulate to maintain a constant the UCB will de-energize the compressor, initiate the ASCD supply air temperature as monitored by the discharge air sensor. Johnson Controls Ducted Systems... -
Page 47: Electric Heating Sequence Of Operations
If the second stage of heat is required, When operating in low ambient mode, an evaporator low limit heater relay (RB) will be energized. After completing the sensor (EC1) temperature below 26ºF will de-energize the Johnson Controls Ducted Systems... -
Page 48: Electric Heat Operation Errors
“ON” cycles and may result in the lowering of the temperature within the conditioned space. Refer to Table 25 for the required electric heat anticipator setting. Table 25: Electric Heat Anticipator Setpoints SETTING, AMPS 0.13 Johnson Controls Ducted Systems... -
Page 49: Gas Heating Sequence Of Operations
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. When voltage is no longer sensed at the GV, Johnson Controls Ducted Systems... -
Page 50: Start-Up (Cooling)
Turn unit electrical power off. Consequently, the control will only respond in the same manner Operating Instructions as outlined above under “Pressure Switch”. An open roll-out will inhibit the gas valve from actuating. Turn unit electrical power on. Johnson Controls Ducted Systems... -
Page 51: Start-Up (Gas Heat)
“Manifold Gas Pressure Adjustment”. Be sure not to over-fire the furnace on Second stage. If in doubt, it is better to leave the Second stage of the furnace slightly under-fired. Repeat Steps 1-5. Johnson Controls Ducted Systems... -
Page 52: Gas Rate Cubic Feet Per Hour
NOTE: When using natural gas, the manifold pressure for second stage (100% input) should be 3.5 IWG ± 0.3. The manifold pressure for first stage (60% input) when using natural gas should be 1.5 IWG ± 0.3. Johnson Controls Ducted Systems... -
Page 53: Gas Heat Stages
Before checking or changing burners, pilot or orifices, CLOSE TERMINAL – C (COMMON) MAIN MANUAL SHUT-OFF VALVE AND SHUT OFF ALL TERMINAL – MP (1ST STAGE) POWER TO THE UNIT. TERMINAL – HI (2ND STAGE) Figure 30: Typical Two Stage Gas Valve Johnson Controls Ducted Systems... -
Page 54: Charging The Unit
TERMINAL – MP (MAIN VALVE) 12011950. Figure 31: Typical Single Stage Gas Valve Charging The Unit All J**ZJ units use Thermal Expansion Devices. Charge the unit to nameplate charge. THERMOSTAT WIRED HERE SD-24 Figure 32: Unit Control Board Johnson Controls Ducted Systems... -
Page 55: Smart Equipment™ Ucb Details
SD-24 and R 24 VAC common for thermostat power LEDs on left edge of UCB POWER Green UCB power indicator Lit indicates 24 VAC is present at C and 24V terminals Johnson Controls Ducted Systems... - Page 56 Input required for variable air volume units. Used in VAV indoor DCT PRS+ w.c. sensor blower operation. Optional input; switch closure for greater than 15 seconds DFS (upper pin) 24 VAC hot return from Dirty Filter Switch during indoor blower operation initiates a notification alarm Johnson Controls Ducted Systems...
- Page 57 Not effective for one stage compressor UCBs. If demand is present and permissions allow compressor 2 operation; output 24 VAC hot output for compressor 2 with compressor cooling, comfort ventilation cooling or heat pump heating demands Johnson Controls Ducted Systems...
- Page 58 1.5 to 3.5 volts reading to C; at least 0.25 volts lower – Communication for SA BUS devices than +) SA BUS communication circuit to optional economizer board, 4-stage board, fault detection & diagnostics board, netstat and/or Multi Touch gateway Johnson Controls Ducted Systems...
- Page 59 Green communication board Isolated Power Lit indicates the UCB is supplying power to the communication ISO PWR indicator sub-board 1. When wiring unit and other devices using the SA Bus and FC Bus, see Table 30. Johnson Controls Ducted Systems...
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Page 60: Cable For Fc Buses And Sa Buses In Order Of Preference . 60 31 Ignition Control Flash Codes
Energized With W1 Off Second Stage Gas Valve Gas Valve Energized With First Stage Gas Valve Off Ignition Lockout Gas Flow Gas Pressure Gas Valve Flame Sensor Steady Off No Power Or Control Failure 24VAC or Control Johnson Controls Ducted Systems... -
Page 61: Start-Up Sheet
5565593-JIM-B-1019 Start-Up Sheet Johnson Controls Ducted Systems... - Page 62 5565593-JIM-B-1019 Johnson Controls Ducted Systems...
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Page 66: 5565593-Jim-B-1019
Subject to change without notice. Printed in U.S.A. 5565593-JIM-B-1019 Copyright © 2019 by Johnson Controls, Inc. All rights reserved. Supersedes: 5565593-JIM-A-0818 York International Corporation 5005 York Drive Norman, OK 73069...
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