Table of Contents
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R-410A
ZR SERIES
6-1/2 - 12-1/2 Ton
60 Hertz
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Preceding Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power And Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 15
Optional Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Optional Gas Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Options/Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Airflow Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Air Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Checking Air Quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
1 ZR078-150 Unit Limitations . . . . . . . . . . . . . . . . . . . . . . . .7
2 Weights and Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 ZR078-150 Unit Accessory Weights . . . . . . . . . . . . . . . . . 9
4 ZR078-150 Unit Physical Dimensions . . . . . . . . . . . . . . .10
5 ZR078-150 Unit Clearances . . . . . . . . . . . . . . . . . . . . . . .10
6 Side Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . .12
7 Control Wire Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
8 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
9 ZR078-150 Physical Data . . . . . . . . . . . . . . . . . . . . . . . .26
10 Electric Heat Minimum Supply Air . . . . . . . . . . . . . . . . . .28
11 Gas Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
12 Gas Pipe Sizing - CapacIty of Pipe . . . . . . . . . . . . . . . . .29
13 Gas Heat Minimum Supply Air . . . . . . . . . . . . . . . . . . . . .30
14 Supply Air Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
15 Altitude/Temperature Correction Factors . . . . . . . . . . . . .35
16 Air Flow Performance - Side Duct Application . . . . . . . .37
17 Air Flow Performance - Bottom Duct Application . . . . . . .39
1 Unit Shipping Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Condenser Covering . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Compressor Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
®
Component Location (ZR120 Shown) . . . . . . 6
5 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Unit 6 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Center of Gravity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
8 ZR078-120 Physical Dimensions . . . . . . . . . . . . . . . . . . 9
9 ZR150 Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . 9
10 ZR078-150 Unit Bottom Duct Openings . . . . . . . . . . . . 10
11 ZR078-150 Unit Electrical Entry . . . . . . . . . . . . . . . . . . 11
12 ZR078-120 Unit Side Duct Openings . . . . . . . . . . . . . . 11
13 ZR150 Unit Side Duct Openings . . . . . . . . . . . . . . . . . . 12
14 ZR078-150 Unit Left Duct Opening . . . . . . . . . . . . . . . . 12
15 ZR078-150 Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . 13
16 ZR078-150 Transition Roof Curb . . . . . . . . . . . . . . . . . 13
17 Side Panels With Hole Plugs . . . . . . . . . . . . . . . . . . . . . 14
18 Return Downflow Plenum With Panel . . . . . . . . . . . . . . 14
19 Discharge Panel In Place . . . . . . . . . . . . . . . . . . . . . . . 14
20 Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
TABLE OF CONTENTS
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Cooling Sequence Of Operation . . . . . . . . . . . . . . . . . . . . 45
No Outdoor Air Options . . . . . . . . . . . . . . . . . . . . . . . . . 45
Cooling Operation Errors . . . . . . . . . . . . . . . . . . . . . . . . 46
Reheat Mode Sequence Of Operation . . . . . . . . . . . . . . . 47
Electric Heating Sequence Of Operations. . . . . . . . . . . . . 49
Electric Heat Operation Errors . . . . . . . . . . . . . . . . . . . . 49
Gas Heating Sequence Of Operations . . . . . . . . . . . . . . . 50
Ignition Control Board. . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Gas Heating Operation Errors . . . . . . . . . . . . . . . . . . . . 51
Start-Up (Cooling) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Start-Up (Gas Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Checking Gas Heat Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Charging The Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Unit Control Board Option Setup . . . . . . . . . . . . . . . . . . . . . . 57
Option Byte Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Heat Delay Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
LIST OF TABLES
18 RPM Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
19 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . .41
20 Power Exhaust Specifications . . . . . . . . . . . . . . . . . . . . .41
21 Motor Sheave Datum Diameters . . . . . . . . . . . . . . . . . . .43
22 Additional Static Resistance . . . . . . . . . . . . . . . . . . . . . . .44
23 Electric Heat Limit Setting 50" Cabinet . . . . . . . . . . . . . . .50
24 Electric Heat Limit Setting 42" Cabinet . . . . . . . . . . . . . . .50
25 Electric Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . .50
26 Gas Heat Limit Control Settings . . . . . . . . . . . . . . . . . . . .52
27 Gas Heat Anticipator Setpoints . . . . . . . . . . . . . . . . . . . .52
28 Gas Rate Cubic Feet Per Hour . . . . . . . . . . . . . . . . . . . .54
29 Gas Heat Stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
30 Unit Control Board Flash Codes . . . . . . . . . . . . . . . . . . . .56
31 Heat Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
32 Ignition Control Flash Codes . . . . . . . . . . . . . . . . . . . . . .57
33 Reheat Control Board Flash Codes . . . . . . . . . . . . . . . . .57
LIST OF FIGURES
Electric Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
23 Typical Low Voltage Field Wiring . . . . . . . . . . . . . . . . . 17
24 Side Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . 29
25 Bottom Entry Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . 29
26 Enthalpy Set Point Chart . . . . . . . . . . . . . . . . . . . . . . . . 33
27 Honeywell Economizer Control W7212 . . . . . . . . . . . . . 33
28 Belt Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
29 Altitude/Temperature Correction Factors . . . . . . . . . . . 35
30 Dry Coil Delta P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
31 Reheat Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . 48
32 System Piping Schematic . . . . . . . . . . . . . . . . . . . . . . . 49
33 Typical Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
34 Typical Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
35 Unit Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
36 Basic Troubleshooting Flowchart . . . . . . . . . . . . . . . . . 58
37 Power On Flow Chart . . . . . . . . . . . . . . . . . . . . . . . . . . 58
38 Trip Failure Flow Chart . . . . . . . . . . . . . . . . . . . . . . . . . 59
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Summary of Contents for Johnson Controls ZR Series
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Page 1: Table Of Contents
R-410A ZR SERIES 6-1/2 - 12-1/2 Ton 60 Hertz TABLE OF CONTENTS General ......... . 2 Operation . -
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%) This system uses R-410A Refrigerant which operates at • Manual Outdoor Air Damper (0-35%) higher pressures than R-22. No other refrigerant may be • Gas Heat Propane Conversion Kit used in this system. Johnson Controls Unitary Products...
- Page 4 4 = 460-3-60 Z = Options 3, 4 & 5 5 = 575-3-60 Options 1 = Disconnect 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
In U.S.A.: Remove the condenser coil external protective covering National Electrical Code, ANSI/NFPA No. 70 - Latest prior to operation. Edition National Fuel Gas Code, ANSI Z223.1 - Latest Edition Johnson Controls Unitary Products... -
Page 6: Predator ® Component Location (Zr120 Shown)
Compressor #1 access Side entry power York Sunline™ footprint to Toolless (high-efficiency compressor and control wiring the ZH Series footprints are door latch w/crankcase heater) knockouts also available (field-installed accessory) ® Figure 4: Predator Component Location (ZR120 Shown) Johnson Controls Unitary Products... -
Page 7: Location
If a unit is to be installed on a roof curb other than a ® varnishes, hydrochloric acid, cements and glues, York roof curb, gasketing must be applied to all antistatic fabric softeners for clothes dryers, masonry surfaces that come in contact with the unit underside. acid washing materials. Johnson Controls Unitary Products... -
Page 8: Weights And Dimensions
Table 2: Weights and Dimensions Weight (lbs.) Center of Gravity 4 Point Load Location (lbs.) 6 Point Load Location (lbs.) Size Model (Tons) Shipping Operating (6.5) (7.5) 1205 1200 25.5 (8.5) 1205 1200 25.5 (10) 1470 1465 25.5 (12.5) Johnson Controls Unitary Products... -
Page 9: Zr078-150 Unit Accessory Weights
29.03 29.03 14.85 Ø 24.58 TYP. 4 PL. 15.23 See detail A for gas inlet 11 3/8 See detail B for drain location 21 3/16 LEFT 4 3/16 FRONT 27 5/16 Figure 9: ZR150 Physical Dimensions Johnson Controls Unitary Products... -
Page 10: Zr078-150 Unit Physical Dimensions
RETURN 27 1/2 LEFT RIGHT 20 1/8 19 1/8 17 1/8 12 5/16 Bottom condensate drain 14 1/2 25 9/16 Bottom gas supply entry 16 3/8 18 1/16 FRONT Figure 10: ZR078-150 Unit Bottom Duct Openings Johnson Controls Unitary Products... -
Page 11: Zr078-150 Unit Electrical Entry
D o t P l u g s Return Supply Air 2 - 3 1 /3 2 5 - 5 /3 2 3 1 - 1 1 /1 6 Figure 12: ZR078-120 Unit Side Duct Openings Johnson Controls Unitary Products... -
Page 12: Side Duct Dimensions
ZR102 28 1/4 18 1/16 28 1/4 18 1/4 ZR120 28 1/4 18 1/16 28 1/4 18 1/4 ZR150 28 1/4 18 1/16 28 1/4 18 1/4 30-3/8 4-5/16 Figure 14: ZR078-150 Unit Left Duct Opening Johnson Controls Unitary Products... -
Page 13: Ductwork
A closed return duct system should be used. This will not Refer to Figure 10 for bottom air duct openings. Refer to preclude use of economizers or outdoor fresh air intake. The Figures 12, 13 and Table 6 for side air duct openings. Johnson Controls Unitary Products... -
Page 14: Condensate Drain
Figure 18: Return Downflow Plenum With Panel 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 Johnson Controls Unitary Products... -
Page 15: Filters
The above water-proofing conditions Power And Control Wiring will also apply when installing a field supplied disconnect switch. Field wiring to the unit, fuses, and disconnects must conform to provisions of National Electrical Code (NEC), ANSI/NFPA No. Johnson Controls Unitary Products... -
Page 16: Typical Field Wiring Disconnect - Cooling Unit With/Without Electric Heat
Figure 21: Typical Field Wiring Disconnect - Cooling Unit With/Without Electric Heat CONTACTOR 1M FACTORY OR FIELD GROUND SUPPLIED DISCONNECT THREE PHASE POWER SUPPLY Figure 22: Typical Field Wiring Disconnect - Cooling Unit With Gas Heat Johnson Controls Unitary Products... -
Page 17: Control Wire Sizes
Dehumidistat closes on rise in humidity. TYPICAL THERMOSTAT ( RCB ) REHEAT CONTROL BOARD TERMINAL BLOCK DEHUMIDISTAT Dehumidistat closes on rise in humidity. Figure 23: Typical Low Voltage Field Wiring Johnson Controls Unitary Products... -
Page 18: Electrical Data
89.3 81.8 112.5 119.4 (8.5) None 25.3 27.5 10.8 25.3 27.5 13.5 21.7 32.2 34.9 28.9 41.2 44.0 40.9 56.2 59.0 None 19.9 21.7 19.9 21.7 10.5 17.3 26.2 28.4 23.1 33.4 35.6 32.7 45.4 47.6 Johnson Controls Unitary Products... - Page 19 57.7 60.5 65.0 71.6 74.3 None 26.1 27.9 17.3 26.8 29.0 13.5 23.1 34.0 36.2 32.7 46.0 48.3 52.0 57.1 59.3 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Unitary Products...
- Page 20 92.7 81.8 115.9 122.7 (8.5) None 26.5 28.7 10.8 26.5 28.7 13.5 21.7 33.7 36.4 28.9 42.7 45.5 40.9 57.7 60.5 None 20.4 22.2 20.4 22.2 10.5 17.3 26.8 29.0 23.1 34.0 36.2 32.7 46.0 48.3 Johnson Controls Unitary Products...
- Page 21 61.2 64.0 65.0 75.1 77.8 None 28.0 29.8 17.3 29.2 31.4 13.5 23.1 36.4 38.6 32.7 48.4 50.6 52.0 59.5 61.7 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Unitary Products...
- Page 22 101.8 81.8 125.0 131.9 (8.5) None 30.3 32.5 10.8 30.3 32.5 13.5 21.7 38.4 41.2 28.9 47.5 50.2 40.9 62.5 65.2 None 23.9 25.7 23.9 25.7 10.5 17.3 31.2 33.4 23.1 38.4 40.6 32.7 50.4 52.6 Johnson Controls Unitary Products...
- Page 23 64.0 66.7 65.0 77.8 80.6 None 30.1 31.9 17.3 31.8 34.0 13.5 23.1 39.0 41.2 32.7 51.0 53.3 52.0 62.1 64.3 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Unitary Products...
- Page 24 105.2 81.8 128.4 135.2 (8.5) None 31.5 33.7 10.8 31.5 33.7 13.5 21.7 39.9 42.7 28.9 49.0 51.7 40.9 64.0 66.7 None 24.4 26.2 24.4 26.2 10.5 17.3 31.8 34.0 23.1 39.0 41.2 32.7 51.0 53.3 Johnson Controls Unitary Products...
- Page 25 67.5 70.2 65.0 81.3 84.1 None 32.0 33.8 17.3 34.2 36.4 13.5 23.1 41.4 43.6 32.7 53.4 55.6 52.0 64.5 66.7 1. Minimum Circuit Ampacity. 2. Dual Element, Time Delay Type. 3. HACR type per NEC. Johnson Controls Unitary Products...
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Page 26: Zr078-150 Physical Data
Tube diameter (in.) Circuitry Type Split-face Split-face Split-face Split-face Split-face EVAPORATOR COIL DATA Face area (Sq. Ft.) 10.6 10.6 13.2 13.2 13.2 Rows Fins per inch Tube diameter Circuitry Type Split-face Split-face Split-face Split-face Split-face Refrigerant control Johnson Controls Unitary Products... - Page 27 2. Cooling with Gas Heat Unit 3. 1 Stage 60% of Full Capacity 4. 2 In. Throwaway, Standard, MERV (Minimum Efficiency Reporting Value) 3. 5. 2 In. Pleated, Optional, MERV 7. 6. 4 In. Pleated, Optional, MERV 13. Johnson Controls Unitary Products...
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Page 28: Optional Electric Heat
2550 2550 2550 2550 208/230-3-60 3000 3000 3000 3500 460-3-60 3000 3000 3000 3000 (10) 600-3-60 3000 3000 3000 3500 208/230-3-60 3750 3750 3750 4000 460-3-60 3750 3750 3750 3750 (12.5) 600-3-60 3750 3750 3750 3750 Johnson Controls Unitary Products... -
Page 29: 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 Figure 24: Side Entry Gas Piping not be sized smaller than the entrance fitting size. Johnson Controls Unitary Products... -
Page 30: Gas Heat Minimum Supply Air
“Limitations”. system at test pressures equal to or less than 1/2 PSIG. Johnson Controls Unitary Products... -
Page 31: Options/Accessories
Check all connections for leaks when piping is completed using instructions for installation. a soap solution. NEVER USE A FLAME. There are two Economizer options: Down Flow application with barometric relief hood standard. Horizontal Flow application that requires the purchase of a barometric relief hood. Johnson Controls Unitary Products... -
Page 32: Economizer And Power Exhaust Set Point Adjustments
Space Sensor Kit Part # 2AQ04700324 terminals “R” to “G” energized, turn the Minimum Position • Optional CO Sensor Kit Part # 2AQ04700424 Adjusting screw (located on the damper control module) Replace the top rear access panel on the unit. Johnson Controls Unitary Products... -
Page 33: Enthalpy Set Point Chart
If the blower or compressors rotate suction and discharge pressures, or producing a high noise in the wrong direction at start-up, the electrical connection to level, the scroll is misphased.) the unit is misphased. Change the phasing of the Field Line Johnson Controls Unitary Products... -
Page 34: Supply Air Limitations
Air density correction factors are shown in Table 15 and Figure 29. SPAN LENGTH DEFL. FORCE Figure 28: Belt Adjustment Johnson Controls Unitary Products... -
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: 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 1VM50 AK74 1035 1079 1126 2.30 1VM50 AK64 1039 1094 1150 1207 1256 1308 Johnson Controls Unitary Products... -
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 0.932. 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 0.932. Johnson Controls Unitary Products...
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Page 39: 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 0.932. Johnson Controls Unitary Products... -
Page 40: Rpm Selection
2.30 1VM50 AK89 (8.5) 3.45 1VM50 AK74 1016 1067 1110 2.30 1VM50 AK84 (10) 3.45 1VM50 AK74 1016 1067 1110 3.45 1VM50 AK74 1016 1067 1110 (12.5) 5.75 1VP56 BK77 1052 1095 1136 1175 1216 1272 Johnson Controls Unitary Products... -
Page 41: Air Balance
Use an Inclined Manometer or Magnehelic to determine air ducts of the unit. the pressure drop across a dry evaporator coil. Since the moisture on an evaporator coil can vary greatly, measuring Johnson Controls Unitary Products... -
Page 42: Dry Coil Delta P
0.55 ZR090 ZR102 ZR120 0.45 ZR150 0.35 0.25 0.15 0.05 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 Air Flow Rate (cfm) 100% Return Economizer No Economizer Figure 30: Dry Coil Delta P Johnson Controls Unitary Products... -
Page 43: Motor Sheave Datum Diameters
Re-checking set screws after 10-12 hrs. run time is recommended. Table 21: Motor Sheave Datum Diameters 1VM50x7/8 1VP56x1-1/8 (1-1/2, 2 & 3 HP Motor) (5 HP Motor) Turns Open Datum Diameter Turns Open Datum Diameter 1-1/2 1-1/2 2-1/2 2-1/2 3-1/2 3-1/2 4-1/2 4-1/2 5-1/2 Johnson Controls Unitary Products... -
Page 44: 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 45: Operation
20 minutes, compressor #2 is Economizer With Power Exhaust energized, provided it has not been locked-out. A unit equipped with an economizer (single or dual enthalpy) and a power exhaust operates as specified above with one Johnson Controls Unitary Products... -
Page 46: Cooling Operation Errors
(Table 30). If the other compressor is inactive, the condenser fans will be de-energized. 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. Johnson Controls Unitary Products... -
Page 47: Reheat Mode Sequence Of Operation
The unit will not operate in the reheat mode if there is any call 3 and SOL 2 and energizes SOL 1, engaging circuit #1, for heating. resulting in circuit #1 cooling mode operation. All safety devices function as previously described. Johnson Controls Unitary Products... -
Page 48: Reheat Control Board
705213-YIM-E-0213 HGRR DEHUMIDISTAT MODE HARNESS SELECTION CONNECTION JUMPER Figure 31: Reheat Control Board Johnson Controls Unitary Products... -
Page 49: Electric Heating Sequence Of Operations
UCB will energize the blower motor. 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 30). Johnson Controls Unitary Products... -
Page 50: Gas Heating Sequence Of Operations
60 seconds (for a total for 120 seconds of high fire operation). After this 60 seconds, the ICB will then use the call for the second stage of heat to control second stage operation of the GV. Johnson Controls Unitary Products... -
Page 51: Gas Heating Operation Errors
(i.e. this purge can be considered the purge associated with a call for “W1”). The auxiliary limit switch is wired in series with the limit switch. As such, the UCB cannot distinguish the auxiliary limit and the Johnson Controls Unitary Products... -
Page 52: Start-Up (Cooling)
Verify proper system pressures for both circuits. Measure the temperature drop across the evaporator coil. Remove the call for heating by lowering the thermostat setting lower than the conditioned space temperature. This resets any flash codes. Johnson Controls Unitary Products... -
Page 53: Start-Up (Gas Heat)
(greater than 60% input). Repeat the operating pressure drop below 4.5 in for natural gas Steps 1-6. units. If gas pressure is outside these limits, contact the local gas utility or propane supplier for corrective action. Johnson Controls Unitary Products... -
Page 54: Gas Rate Cubic Feet Per Hour
NOTE: Each gas heat exchanger size has a minimum Manifold pressure adjustment procedure. allowable CFM. Below this CFM, the limit will open. Adjust second stage (100% input) pressure first, then adjust first stage (60% input) pressure. Johnson Controls Unitary Products... -
Page 55: Charging The Unit
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 30. Figure 34: Typical Gas Valve Johnson Controls Unitary Products... -
Page 56: Unit Control Board Flash Codes
EEPROM Storage Failure No Power or Control Failure 1. Non-alarm condition. Check Alarm History Reset All ASCDs for One Cycle Non Alarm Condition Green LED Flashing Current Alarm Flashed Red LED Figure 35: Unit Control Board Johnson Controls Unitary Products... -
Page 57: Unit Control Board Option Setup
Hot Gas Reheat is on with Y1 Output Delay). 2 Flashes (No Call for Cooling) Y1, Y2, and Hot Gas Reheat is on because of a 3 Flashes call for Y1 and Humidistat. See alt operation No Power or Control Failure Johnson Controls Unitary Products... -
Page 58: Basic Troubleshooting Flowchart
Cool Off for ID Blower? ID Blower? for Cooling? Figure 36: Basic Troubleshooting Flowchart Call for Voltage @ Power to heat? Gas Valve? Unit Energize ID Initialize ASCD Blower Montior Figure 37: Power On Flow Chart Johnson Controls Unitary Products... -
Page 59: Trip Failure Flow Chart
705213-YIM-E-0213 Figure 38: Trip Failure Flow Chart Johnson Controls Unitary Products... - Page 60 10. If 24 volts is present at the UCB Y1 terminal and none of cooling and the compressors will not immediately operate. the switches are open and the compressor is not locked If both stages of cooling are requested simultaneously and Johnson Controls Unitary Products...
- Page 61 #1 will be held off for the ASCD, and If installed, check the position of the economizer blades. If compressor #2 may be held off for a portion of the the blades are open, the economizer is providing free ASCD. See the next step. Johnson Controls Unitary Products...
- Page 62 If 24 volts is not present at Y1 “ECON”, the UCB UCB’s Mate-N-Lock plug. has faulted. The UCB should de-energize all compressors 13. The UCB can be programmed to lock out compressor operation during free cooling and in low ambient Johnson Controls Unitary Products...
- Page 63 If the problem If 24 volts is present at the UCB terminal, check for loose persists, the draft motor may need replacement. wiring between the UCB and M3. Johnson Controls Unitary Products...
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Page 64: 705213-Yim-E-0213
ICB. Check all wiring between the ICB and Subject to change without notice. Printed in U.S.A. 705213-YIM-E-0213 Copyright © 2013 by Johnson Controls, Inc. All rights reserved. Supersedes: 705213-YIM-D-0512 Johnson Controls Unitary Products 5005 York Drive...
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