Allied A96US2V090C16S - User Manual

508148-01 Issue 2128 Page 1 of 75
SERVICE MANUAL
A96US2V Gas Furnace
(P) 508148-01
*P508148-01*
Table of Contents
Technical Specications - A96US2V............................2
Parts Arrangement.......................................................6
Unit Components .........................................................7
Placement and Installation ........................................28
Joint Cementing Procedure .......................................29
Venting Practices .......................................................30
Vent Piping Guidelines ..............................................34
Condensate Piping ....................................................47
Start-Up .....................................................................52
Heating System Service Checks ...............................53
Proper Ground and Voltage ....................................... 56
Typical Operating Characteristics .............................. 57
Maintenance ..............................................................58
Wiring and Sequence of Operation ...........................61
Field Wiring Applications with Conventional Thermostat
...................................................................................66
Program Unit Capacity Size Modes...........................70
Troubleshooting: Heating Sequence of Operation ....71
Troubleshooting: Cooling Sequence of Operation ..... 74
Troubleshooting: Continuous Fan Sequence of
Operation ...................................................................75
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to
the potential for personal injury or death.
Electric shock hazard.
Can cause injury or death. Before attempting
to perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
WARNING
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves
and protective clothing.
CAUTION
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer (or
equivalent), service agency or the gas supplier.
WARNING

Summary

SERVICE MANUAL

A96 US2 V Gas Furnace

Identifies the specific gas furnace model covered by this service manual.

Technical Specifications - A96 US2 V

PHYSICAL AND ELECTRICAL DATA

Provides a table of physical dimensions and electrical characteristics for various models.

Unit Components

Control Box

Integrated Control (A92)

Details the integrated control system, its features, and compatibility with thermostats.

Program Unit Capacity;Size Mode

On-Board Links

On-Board Link W914 Dehum (R to DS)

On-Board Link W951 Heat Pump (R to O)

On-Board Link W915 2-Stage Compressor (Y1 to Y2)

Indoor Blower Motor

Troubleshooting Motor Operation

Heating Components

Ignitor

Details the ignitor's material, voltage, resistance, and location.

Flame Sensor

Explains the flame sensor's function, mounting, and how to check its signal.

Troubleshooting Motor Windings

Combustion Air Inducer and Cold End Header Box

Combustion Air Inducer Pressure Switch

Ignitor Check

Pressure Switch Check

Placement and Installation

PRIMER & SOLVENT CEMENT

CANADA PIPE & FITTING & SOLVENT CEMENT

Venting Practices

Removal of the Furnace from Common Vent

Exhaust Piping

Intake Piping

Vent Piping Guidelines

General Guidelines for Vent Terminations

VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA

Details of Intake and Exhaust Piping Terminations for Direct Vent Installations

VENT TERMINATION CLEARANCES FOR NON-DIRECT VENT INSTALLATIONS IN THE US AND CANADA

US Installations1

Canadian Installations2

Details of Exhaust Piping Terminations for Non-Direct Vent Applications

Condensate Piping

Start-Up

Preliminary and Seasonal Checks

Heating Start-Up

Provides guidance on checking for gas leaks and initial burner operation.

Priming Condensate Trap

Heating System Service Checks

Gas Piping

Testing Gas Piping

Explains procedures for testing gas piping for leaks and pressure integrity.

Proper Combustion

High Altitude

Proper Ground and Voltage

Typical Operating Characteristics

Blower Operation and Adjustment

Temperature Rise

External Static Pressure

Details how to measure external static pressure and adjust blower speed accordingly.

Maintenance

Blower

Filters

Electrical

Safety warnings and checks for furnace wiring, voltage, and motor amp-draw.

Cleaning the Heat Exchanger and Burner

Cleaning the Burner Assembly

Wiring and Sequence of Operation

Sequence of Operation

Applications Using a Two-Stage Thermostat

Details the heating sequence when using a two-stage thermostat.

Applications Using a Single-Stage Thermostat

Details the heating sequence when using a single-stage thermostat.

Field Wiring Applications with Conventional Thermostat

Program Unit Capacity Size Modes

Troubleshooting: Heating Sequence of Operation

Troubleshooting: Cooling Sequence of Operation

Troubleshooting: Continuous Fan Sequence of Operation

Allied A96US2V090C16S Specifications

General

AFUE	96%
Stages	Two-Stage
Blower Motor	Variable Speed
Heating Capacity	90, 000 BTU
Fuel Type	Natural Gas
Warranty	10-Year Parts, Lifetime Heat Exchanger