Johnson Controls Series 20 J 15 DJ User Manual

349687-JTG-A-1007
FOR DISTRIBUTION USE ONLY - NOT TO BE USED AT POINT OF RETAIL SALE
TECHNICAL GUIDE
SERIES 20
SINGLE PACKAGE GAS/ELECTRIC UNITS
AND SINGLE PACKAGE AIR
CONDITIONERS
J15, 18, 20 & 25 DJ
15 & 25 NOMINAL TONS
12.00 EER (15 TONS), 11.70 EER (17.5 TONS),
11.3 EER (20 TONS), 10.5 EER (25 TONS)
DESCRIPTION
Johnson Controls Series 20 J**DJ units are convertible single
package high efficiency rooftops. All models have indepen-
dent dual refrigerant circuits for efficient part load operation.
Although the units are primarily designed for curb mounting
on a roof, they can also be slab-mounted at ground level or
set on steel beams above a finished roof.
All units include:
• Powder Paint finish that meets ASTM-B-117 750 hour
salt spray standards
• Two-stage cooling provided by dual independent
refrigeration circuits with expansion valves, filter-driers, high
and low pressure/loss of charge switches and freezestats
• Scroll compressors
• Two-stage heating provided by dual independent heat
exchangers with aluminized steel tubes, redundant gas
valves, spark ignition with induced draft logic
• Permanently lubricated motors
• Bottom or side air discharge configuration capability
(field convertible)
• Belt Drive Blower Motor with high static drive option
• Constant supply air volume (CV) with optional variable
air volume (VAV)
• Manufactured under the quality standards of ISO9001
• Zero-25% fixed air damper with hood
• Copper tube/aluminum fin coils
• Hinged filter access and tool free latched doors
• Hinged tool free blower, blower motor, filters and electri-
cal panel access
• Rigging holes in base rails for lifting
• Single point power connection
• Complete factory package - tested, charged and wired
• CSA agency approvals on all units
WARRANTY
• One-year parts warranty
• A Five-year parts warranty on the compressors and
electric heat elements
• Ten-year parts warranty on the gas-fired heat
exchangers

Johnson Controls Series 20 J 15 DJ Specifications

General

Brand	Johnson Controls
Model	Series 20 J 15 DJ
Category	Air Conditioner
Language	English

Summary

Technical Guide Overview

Product Description

Overview of Johnson Controls Series 20 J**DJ convertible single package rooftops.

Product Warranty Information

Details on the limited parts warranty for the complete unit and specific components.

Product Nomenclature

Product Features

Unit Control and Safety Features

Details on low ambient operation, anti-short cycle, lead-lag, and diagnostic capabilities.

Factory-Installed Options

Single Input Electronic Enthalpy Economizer

Economizer with outdoor air sensor for free cooling.

BAS-Ready Economizer

Economizer for Building Automation System integration.

Additional Factory-Installed Options

Variable Air Volume (VAV) System

VAV control using VFD for constant supply duct static pressure.

Filter Options

Available filter choices including 2" and 4" pleated filters.

Field-Installed Accessories

Roof Curbs

14" high curbs for watertight roof installation.

High Altitude Kits

Orifices for natural gas or propane at higher altitudes.

More Field-Installed Accessories

Economizer Accessory Control Kit

Kit to convert single enthalpy to dual enthalpy economizer.

CO2 Sensor

Monitors CO2 levels to override economizer.

Altitude and Temperature Corrections

Example Calculations for Altitude

Demonstrates how to apply correction factors for CFM, static pressure, and BHP.

Control Wiring Diagrams

Power Wiring

Details for connecting the main power supply to the unit.

Front View Dimensions

Utilities Entry Data

Locations for gas and electrical entry points.

Rear View Dimensions

Unit Dimensions and Clearances

Minimum Clearances

Required installation space around the unit.

Unit Center of Gravity and Applications

Typical Unit Applications

Illustrations of curb, roof jack, and slab installations.

Four and Six Point Loads

Roof Curb Dimensions and Details

Roof Curb Duct Openings

Specifications for duct penetration through roof curbs.

Typical Unit Wiring Diagram

Guide Specifications

General Specifications

Overall unit description, certifications, and manufacturing standards.

Unit Cabinet Specifications

Details on cabinet construction, insulation, and access.

Indoor Fan Assembly Details

Specifications for the evaporator fan and motor.

More Guide Specifications

Refrigerant Components

Details on compressors, coils, and safety components.

Unit Controls

Overview of the control circuit, safety devices, and diagnostics.

Gas Heating Section

Specifications for the gas-fired heat exchanger and burner system.

Continued Guide Specifications

Electric Heating Section

Details on electric heating elements and stage control.

Unit Operating Characteristics

Performance parameters including temperature limits and fan delays.

Optional Outdoor Air Systems

Description of economizer and motorized damper options.

Accessories and Options Summary

Pre-Engineered Accessories

List of accessories available for field installation.

Factory Installed Options

List of options available for factory installation.

Control System Integration

Overview of Johnson Light Commercial System and UNT 1126 Controller.