Table of Contents
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R-410A
ZU SERIES
3 - 5 Ton
60 Hertz
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Preceding Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power And Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 17
Optional Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Optional Gas Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Options/Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Airflow Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
1 ZU-A3 thru -A5 Unit Limitations . . . . . . . . . . . . . . . . . . . . 7
2 Weights and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 ZU-A3 thru -A5 Unit Accessory Weights . . . . . . . . . . . . . . 8
4 ZU-A3 thru -A5 Unit Physical Dimensions . . . . . . . . . . . 11
5 ZU-A3 thru -A5 Unit Clearances . . . . . . . . . . . . . . . . . . . 11
6 Side Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7 Control Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9 Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
10 Electric Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . 27
11 Gas Pipe Sizing - CapacIty of Pipe . . . . . . . . . . . . . . . . . 28
12 Gas Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . . . 29
13 Supply Air Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
14 Altitude/Temperature Correction Factors . . . . . . . . . . . . 34
1 Unit Shipping Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Condenser Covering . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Compressor Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Component Location (ZU-A4 Shown) . . . . . . . . . . . . . . . 6
5 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Unit 6 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Center of Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
8 ZU-A3 thru -A4 Physical Dimensions . . . . . . . . . . . . . . . . 9
9 ZU-A5 Physical Dimensions . . . . . . . . . . . . . . . . . . . . . 10
10 ZU-A3 thru -A5 Unit Bottom Duct Openings . . . . . . . . . 12
11 ZU-A3 thru -A5 Unit Electrical Entry . . . . . . . . . . . . . . . 13
12 ZU-A3 thru -A5 Unit Side Duct Openings . . . . . . . . . . . 13
13 ZU-A3 thru -A5 Unit Left Duct Opening . . . . . . . . . . . . . 14
14 ZU-A3 thru -A5 Roof Curb . . . . . . . . . . . . . . . . . . . . . . . 14
15 ZU-A3 thru -A5 Transition Roof Curb . . . . . . . . . . . . . . . 15
16 Side Panels With Hole Plugs . . . . . . . . . . . . . . . . . . . . . 15
TABLE OF CONTENTS
Air Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Checking Air Quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . 42
No Outdoor Air Options . . . . . . . . . . . . . . . . . . . . . . . . . 42
Cooling Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . 42
Electric Heating Sequence Of Operations . . . . . . . . . . . . 44
Electric Heat Operation Errors . . . . . . . . . . . . . . . . . . . . 44
Gas Heating Sequence Of Operations . . . . . . . . . . . . . . . 45
Ignition Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Gas Heating Operation Errors . . . . . . . . . . . . . . . . . . . . 45
Start-Up (Cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Start-Up (Gas Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Checking Gas Heat Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Charging The Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Fan On And Off Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
LIST OF TABLES
15 Airflow Performance - Side Duct Application . . . . . . . . . 36
16 Airflow Performance - Bottom Duct Application . . . . . . . 37
17 RPM Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
18 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . . 38
19 Power Exhaust Specifications . . . . . . . . . . . . . . . . . . . . 38
20 Motor Sheave Datum Diameters . . . . . . . . . . . . . . . . . . 40
21 Additional Static Resistance . . . . . . . . . . . . . . . . . . . . . . 41
22 Electric Heat Limit Setting . . . . . . . . . . . . . . . . . . . . . . . . 44
23 Electric Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . 45
24 Gas Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . . 47
25 Gas Rate Cubic Feet Per Hour . . . . . . . . . . . . . . . . . . . . 49
26 Gas Heat Stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
27 Unit Control Board Flash Codes . . . . . . . . . . . . . . . . . . . 55
28 Ignition Control Flash Codes . . . . . . . . . . . . . . . . . . . . . . 55
LIST OF FIGURES
17 Return Downflow Plenum With Panel . . . . . . . . . . . . . . 16
18 Discharge Panel In Place . . . . . . . . . . . . . . . . . . . . . . . . 16
19 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
20 Field Wiring Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . 18
21 Typical Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . 19
22 Side Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . 28
23 Bottom Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . 28
24 Enthalpy Set Point Chart . . . . . . . . . . . . . . . . . . . . . . . . 32
25 Honeywell Economizer Control W7212 . . . . . . . . . . . . . 32
26 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
27 Altitude/Temperature Correction Factors . . . . . . . . . . . . 34
28 Dry Coil Delta P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
29 Typical Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
30 Typical Two Stage Gas Valve . . . . . . . . . . . . . . . . . . . . 50
31 Typical Single Stage Gas Valve . . . . . . . . . . . . . . . . . . . 50
32 Unit Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
689670-BIM-A-0311
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Table of Contents
Related Manuals for Johnson Controls 20 J ZJ Series
Summary of Contents for Johnson Controls 20 J ZJ Series
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Page 1: Table Of Contents
R-410A ZU SERIES 3 - 5 Ton 60 Hertz TABLE OF CONTENTS General ......... . 2 Air Balance . -
Page 2: General
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 safety precautions and codes including ANSI Z223.1 or CSA- B149.1- latest edition. Johnson Controls Unitary Products... - Page 3 • Manual Outdoor Air Damper (0-100%) • Manual Outdoor Air Damper (0-35%) • Gas Heat Propane Conversion Kit • Gas Heat High Altitude Kit (Natural Gas) • Gas Heat High Altitude Kit (Propane) • –60F Gas Heat Kit Johnson Controls Unitary Products...
- Page 4 T = Hi Static/Slab Econo./Power Exhaust Options (Downflow Only) U = Hi Static/Slab Econo./Barometric Relief 1 = Disconnect (Downflow only) 2 = Non-Pwr'd Conv. Outlet 3 = Smoke Detector S.A. 4 = Smoke Detector R.A. 5 = Pwr'd Conv. Outlet Johnson Controls Unitary Products...
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Page 5: Installation
230v and 415v power supply respectively. Change Tap on transformer for 208-3-60 or 380-3-50 operation. Figure 1: Unit Shipping Bracket See unit wiring diagram. Turn each bracket toward the ground and the protective plywood covering will drop to the ground. Johnson Controls Unitary Products... -
Page 6: Limitations
Slide-out drain pan knockouts Compressor access (high- with ¾" NPT Intelligent control board efficiency compressor w/ connection for safe and efficient crankcase heater) Toolless door operation latch Figure 4: Component Location (ZU-A4 Shown) Johnson Controls Unitary Products... -
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 Unitary Products... -
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 Unitary Products... -
Page 9: Zu-A3 Thru -A4 Physical Dimensions
689670-BIM-A-0311 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 27 5/16 21 3/16 Figure 8: ZU-A3 thru -A4 Physical Dimensions Johnson Controls Unitary Products... -
Page 10: Zu-A5 Physical Dimensions
15.25 15.38 59.00 15.38 Ø 24.47 TYP. 2 PL. 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 9: ZU-A5 Physical Dimensions Johnson Controls Unitary Products... -
Page 11: Zu-A3 Thru -A5 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 Unitary Products... -
Page 12: Zu-A3 Thru -A5 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: ZU-A3 thru -A5 Unit Bottom Duct Openings Johnson Controls Unitary Products... -
Page 13: Side Duct Dimensions
Figure 12: ZU-A3 thru -A5 Unit Side Duct Openings Table 6: Side Duct Dimensions Dimension (in.) Unit Model Number ZU-A3 27 3/4 12 1/16 27 1/2 ZU-A4 27 3/4 12 1/16 27 1/2 ZU-A5 27 3/4 12 1/16 27 1/2 Johnson Controls Unitary Products... -
Page 14: Zu-A3 Thru -A5 Unit Left Duct Opening
Figure 13: ZU-A3 thru -A5 Unit Left Duct Opening 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: ZU-A3 thru -A5 Roof Curb Johnson Controls Unitary Products... -
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 Unitary Products... -
Page 16: Condensate Drain
Figure 19: Condensate Drain Filters Two-inch filters are supplied with each unit. One-inch filters may be used with no modification to the filter racks. Filters must always be installed ahead of evaporator coil and must be kept Johnson Controls Unitary Products... -
Page 17: Power And Control Wiring
The above water-proofing conditions integral part of the design certified unit. Field alteration to will also apply when installing a field supplied disconnect comply with electrical codes should not be required. If any of switch. Johnson Controls Unitary Products... -
Page 18: Field Wiring Disconnect
Refer to Electrical Data Table 8 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 20: Field Wiring Disconnect Johnson Controls Unitary Products... -
Page 19: Control Wire Sizes
REMOVE JUMPER J2 FROM TERMINALS 4 AND 9 ON JUMPER PLUG CONNECTOR P6 ON UNITS WITH ECONOMIZER. TERMINALS A1 AND A2 PROVIDE A RELAY OUT-PUT TO CLOSE THE OUTDOOR ECONOMIZER DAMPERS WHEN THE THERMOSTAT SWITCHES TO THE SET-BACK POSITION. Figure 21: Typical Control Wiring Johnson Controls Unitary Products... -
Page 20: Electrical Data
18.0 26.3 29.1 24.1 33.8 36.6 28.9 39.8 42.6 None 11.8 13.8 16.1 14.4 23.3 19.2 27.1 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 Unitary Products... - Page 21 29.6 24.1 34.3 37.1 28.9 40.3 43.1 None 10.3 12.1 14.2 16.5 14.4 21.4 23.7 19.2 27.4 29.7 23.1 32.2 34.5 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Unitary Products...
- Page 22 18.0 32.6 35.3 24.1 40.1 42.8 28.9 46.1 48.8 None 15.8 18.8 21.1 14.4 28.3 19.2 32.1 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 Unitary Products...
- Page 23 35.8 24.1 40.6 43.3 28.9 46.6 49.3 None 14.3 16.1 19.2 21.5 14.4 26.4 28.7 19.2 32.4 34.7 23.1 37.2 39.5 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Unitary Products...
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Page 24: Physical Data
Fins per inch Tube diameter (in./MM) 1/25 .71/18 .71/18 Circuitry Type 2-pass Microchannel 2-pass Microchannel 2-pass Microchannel EVAPORATOR COIL DATA Face area (Sq. Ft.) 10.6 Rows Fins per inch Tube diameter 0.375 0.375 0.375 Refrigerant control Johnson Controls Unitary Products... - Page 25 4 - (24 x 16 x 4) 4 - (24 x 16 x 4) 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. Johnson Controls Unitary Products...
- Page 26 Fins per inch Tube diameter (in./MM) 1/25 .71/18 .71/18 Circuitry Type 2-pass Microchannel 2-pass Microchannel 2-pass Microchannel EVAPORATOR COIL DATA Face area (Sq. Ft.) 10.6 Rows Fins per inch Tube diameter 0.375 0.375 0.375 Refrigerant control Johnson Controls Unitary Products...
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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 Unitary Products... -
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 Unitary Products... -
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 Unitary Products... -
Page 30: Options/Accessories
If factory installed, refer to installation. These heaters mount in the heat compartment with the instructions included with the outdoor air hood to complete the heating elements extending into the supply air chamber. All Johnson Controls Unitary Products... -
Page 31: Standard Economizer And Power Exhaust Set Point Adjustments
• Optional CO Sensor Kit Part # 2AQ04700424 Minimum Position Adjustment Replace the top rear access panel on the unit. • Check that the damper blades move smoothly without binding; carefully turn the Minimum Position Adjust screw Johnson Controls Unitary Products... -
Page 32: Enthalpy Set Point Chart
If the blower or compressors rotate in the suction and discharge pressures, or producing a high noise wrong direction at start-up, the electrical connection to the unit level, the scroll is misphased.) is misphased. Change the phasing of the Field Line Johnson Controls Unitary Products... -
Page 33: Supply Air Limitations
Air density correction factors are shown in Table 14 and Figure 27. SPAN LENGTH DEFL. FORCE Figure 26: Belt Adjustment Johnson Controls Unitary Products... -
Page 34: 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 35: Airflow Performance
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 Unitary Products... -
Page 36: Airflow 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 0.932. 4. Field Supplied Drive. Johnson Controls Unitary Products... -
Page 37: 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 Unitary Products... -
Page 38: 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 Unitary Products... -
Page 39: Dry Coil Delta P
Determine the number of turns the variable motor sheave is open. 0.35 ZU-A5 ZU-A3 ZU-A4 0.25 0.15 0.05 1000 1500 2000 2500 3000 Airflow (CFM) Figure 28: Dry Coil Delta P Johnson Controls Unitary Products... -
Page 40: 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 Unitary Products... -
Page 41: 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 Unitary Products... -
Page 42: Operation
To be available, a compressor must not be locked-out due to a intended parameters. Errors are handled as described below. All high or low-pressure switch or freezestat trip and the anti-short system errors override minimum run times for compressors. cycle delay (ASCD) must have elapsed. Johnson Controls Unitary Products... - Page 43 The UCB will initiate a flash code associated with errors within the thermostat is calling for cooling, the UCB will operate in the the system. Refer to UNIT CONTROL BOARD FLASH CODES low ambient mode. Table 27. Johnson Controls Unitary Products...
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Page 44: Electric Heating Sequence Of Operations
This control is located inside the heater compartment and is set to open at the temperature indicated in the Electric Heat Limit Setting Table 22. It resets automatically. The limit switch operates when a high temperature condition, caused by Johnson Controls Unitary Products... -
Page 45: Gas Heating Sequence Of Operations
GV to close and the retry operation to lock-on the indoor blower motor and flash code is initiated (See begin. After the flame stabilization period, a loss of flame for 3/4 Table 27). Johnson Controls Unitary Products... - Page 46 See Table 28 Ignition Control Flash Codes. flash code (Table 27). The indoor blower motor will not be The draft motor is energized until the pressure switch closes or locked-on while there is no GV voltage. “W1” is lost. Johnson Controls Unitary Products...
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Page 47: Start-Up (Cooling)
• If blower rotation is in the wrong direction. Refer to ignite for the second stage heat. Phasing Section in general information section. Check blower drive belt tension. Johnson Controls Unitary Products... -
Page 48: Checking Gas Heat Input
Steps 1-6. furnace. The intended input for each furnace is shown in Table 26. The table applies to units operating on 60 Hz power only. Johnson Controls Unitary Products... -
Page 49: Gas Rate Cubic Feet Per Hour
The second stage (100% input) adjustment screw is adjacent to the “HI” marking on the valve and the first stage (70% input) adjustment screw is located adjacent to the “LO” marking on the valve (See Figure 30). Johnson Controls Unitary Products... -
Page 50: Charging The Unit
Figure 31: Typical Single Stage Gas Valve Charging The Unit HEAT EXCHANGER TUBE All ZU units use Thermal Expansion Devices. Charge the unit to 10° subcooling. SUPPLY PIPE BURNER BURNER FLAME (BLUE ONLY) BURNER BRACKET IGNITOR Figure 29: Typical Flame Johnson Controls Unitary Products... -
Page 51: Troubleshooting
“FAN”. If 24 volts is present at the FAN, check for loose b. Proper wiring between the room thermostat and the wiring between the UCB and M3. UCB, i.e. Y1 to Y1, Y2 to Y2 c. Loose wiring from the room thermostat to the UCB. Johnson Controls Unitary Products... - Page 52 If the supply air blower motor does not energize when the operation during free cooling and in low ambient fan switch is set to “ON,” check that line voltage is being supplied to the contacts of the M3 contactor, and that the Johnson Controls Unitary Products...
- Page 53 If the motor shell is cold with the room thermostat calling “BURNER/ORIFICE INSPECTION/SERVICING”. Clean or for heat, check for line voltage at the motor leads. If line replace burner orifices and burners as needed. voltage is present, replace the draft motor. Johnson Controls Unitary Products...
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Page 54: Fan On And Off Delays
1, which is the factory default. Current alarms or active restrictions are flashed on the ICB LED. No history is stored on the ICB. Figure 32: Unit Control Board Johnson Controls Unitary Products... -
Page 55: Unit Control Board Flash Codes
No Power Or Control Steady Off 24VAC or Control Failure Subject to change without notice. Printed in U.S.A. 689670-BIM-A-0311 Copyright © 2011 by Johnson Controls, Inc. All rights reserved. Supersedes: 527728-BIM-D-1210 Johnson Controls Unitary Products 5005 York Drive Norman, OK 73069...