Name: Johnson Controls 20 J ZJ Series
Brand: Johnson Controls
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689670-BIM-A-0311

18 Johnson Controls Unitary Products

Power Wiring Detail

Units are factory wired for the voltage shown on the unit

nameplate. Refer to Electrical Data Table 8 to size power

wiring, fuses, and disconnect switch.

Power wiring is brought into the unit through the side of the unit

or the basepan inside the curb.

Figure 20: Field Wiring Disconnect

THREE

PHASE

POWER

SUPPLY

FACTORY OR FIELD

SUPPLIED DISCONNECT

GROUND

LUG

TERMINAL BLOCK TB1

Table of Contents1
General2
Installation5
- Preceding Installation5
- Unit Shipping Bracket5
- Condenser Covering5
- Compressor Section5
  - Limitations6
- Component Location (ZU-A4 Shown)6
  - Location7
  - Rigging and Handling7
- ZU-A3 Thru -A5 Unit Limitations7
- Weights and Dimensions8
- ZU-A3 Thru -A5 Unit Accessory Weights8
- Unit 4 Point Load Weight8
- Unit 6 Point Load Weight8
- Center of Gravity8
- ZU-A3 Thru -A4 Physical Dimensions9
- ZU-A5 Physical Dimensions10
- ZU-A3 Thru -A5 Unit Physical Dimensions11
- ZU-A3 Thru -A5 Unit Clearances11
ZU-A3 Thru -A5 Unit Bottom Duct Openings12
- Side Duct Dimensions13
ZU-A3 Thru -A5 Unit Electrical Entry13
ZU-A3 Thru -A5 Unit Side Duct Openings13
ZU-A3 Thru -A5 Unit Left Duct Opening14
ZU-A3 Thru -A5 Roof Curb14
- Ductwork15
ZU-A3 Thru -A5 Transition Roof Curb15
Side Panels with Hole Plugs15
- Condensate Drain16
- Compressors16
- Filters16
- Return Downflow Plenum with Panel16
- Discharge Panel in Place16
- Power and Control Wiring17
- Field Wiring Disconnect18
- Control Wire Sizes19
  - Typical Control Wiring19
- Electrical Data20
- Physical Data24
  - Optional Electric Heat27
Electric Heat Minimum Supply Air27
- Optional Gas Heat28
Gas Pipe Sizing - Capacity of Pipe28
- Side Entry Gas Piping28
- Bottom Entry Gas Piping28
Gas Heat Minimum Supply Air29
- Options/Accessories30
- Standard Economizer and Power Exhaust Set Point Adjustments31
- Enthalpy Set Point Chart32
- Honeywell Economizer Control W721232
Supply Air Limitations33
- Belt Adjustment33
Altitude/Temperature Correction Factors34
- Airflow Performance35
- Airflow Performance - Side Duct Application36
- Airflow Performance - Bottom Duct Application37
- Air Balance38
- Checking Air Quantity38
Operation42
- Cooling Sequence of Operation42
  - No Outdoor Air Options42
  - Cooling Operation Errors42
- Electric Heating Sequence of Operations44
  - Electric Heat Operation Errors44
  - Electric Heat Limit Setting44
- Gas Heating Sequence of Operations45
Start-Up (Cooling)47
Start-Up (Gas Heat)47
- Gas Heat Anticipator Setpoints47
Checking Gas Heat Input48
- Gas Rate Cubic Feet Per Hour49
- Gas Heat Stages49
Charging the Unit50
- Typical Flame50
- Typical Two Stage Gas Valve50
- Typical Single Stage Gas Valve50
Troubleshooting51
- Fan on and off Delays54

Brand	Johnson Controls
Model	20 J ZJ Series
Category	Air Conditioner
Language	English

Johnson Controls 20 J ZJ Series User Manual

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Johnson Controls 20 J ZJ Series Specifications

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