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Amana GUIB090CX50 User Manual

Amana GUIB090CX50
106 pages
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RS6620002
Revision 2
December 1998
Service
Instructions
40" 80% Gas Furnaces
GUIA, GCIA, GUIB, GCIB, GUIC, GCIC
GUID, GUIS, GCIS, GUIV & Accessories
Model and Manufacturing
numbers listed on page 4&5
This manual is to be used by qualified HVAC
technicians only. Amana does not assume
any responsibility for property damage or
personal injury for improper service
procedures done by an unqualified person.
A
higher standard of comfor
t
Heating
n
Air Conditioning
®

Table of Contents

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Amana GUIB090CX50 Specifications

General IconGeneral
ModelGUIB090CX50
TypeGas Furnace
Heating Capacity90, 000 BTU
Efficiency Rating80% AFUE
Blower MotorMulti-Speed
Fuel TypeNatural Gas
Heating StagesSingle Stage
Vent TypeCategory I

Summary

Service Instructions

For Your Safety Read Before Operating

What To Do If You Smell Gas

Step-by-step instructions on what to do in case of a gas leak.

To Turn Off Gas To Appliance

Instructions on how to safely turn off the gas supply to the appliance.

Furnace Specifications

Blower Performance Specifications

Product Design

Gas Supply and Piping

Information on gas supply types, pressures, and piping requirements.

Tanks and Piping - Propane Units

Safety and installation guidelines for propane gas tanks and piping.

Electrical Wiring

General guidelines for electrical wiring, polarization, and grounding.

Thermostat Wiring

Typical field wiring diagrams for thermostat connections.

System Operation

Operating Instructions

Step-by-step instructions for operating the furnace.

Sequence of Operation

Normal heating sequence for GUIS/GCIS furnaces.

Abnormal Operation

Causes and fixes for abnormal operation in GUIV/WR 50A51-255 systems.

Troubleshooting Chart for Models Using Heatcraft HSI-2 Ignition Control

Troubleshooting chart for HSI-2 ignition control issues.

Diagnostic Signal Chart

Chart correlating LED flash codes to abnormal operation causes.

Maintenance

Annual Inspection

Recommended annual inspection points for furnace operation.

Servicing

S-1 Checking Voltage

Procedure for checking voltage supply to the furnace.

S-4 Checking Transformer and Control Circuit

Procedures for checking the transformer and control circuit.

S-6 Checking Auxiliary Limit Control

Location and testing procedure for the auxiliary limit control.

Pressure Switch Trip Points and Usage Chart

Continuation of pressure switch trip points and usage data.

S-14A Models with WR50A52 Ignition Control & Radiant Sense Flame Sensor

Checking radiant sense flame sensor and its components.

S-16 Checking Orifices

Procedure for checking and resizing gas orifices.

S-18 Checking Gas Pressure

Procedure for measuring and adjusting inlet gas supply pressure.

Gas Manifold Pressure Measurement and Adjustment

Procedure for measuring and adjusting gas manifold pressure.

Propane Gas Adjustments

Manifold pressure adjustments for propane gas.

S-21 Checking Duct Static

Procedure for measuring static pressure of the return and supply ducts.

Caution

Caution on adjusting gas manifold pressure.

Heating Performance Test

Procedure for conducting a heating performance test.

S-5 Checking Primary Limit Control

Testing and identifying primary limit control styles.

S-7 Checking Flame Rollout Switch

Testing the flame rollout switch for operation.

S-8A High Altitude Pressure Switch

Necessity of replacing pressure switches and orifices at high altitudes.

S-10 Checking Capacitor

Function and testing methods for permanent split capacitor motors.

S-11 Checking Gas Valve (Redundant)

Testing redundant gas valves for coil resistance.

S-13A Checking WR50A52 Integrated Ignition Control Module (Radiant Sense)

Checking WR50A52 integrated ignition control module.

Warning

Caution regarding inlet gas supply pressure specifications.

S-22 Checking Temperature Rise

Procedure for checking temperature rise across the heat exchanger.

S-3 Checking Thermostat, Wiring, and Anticipator

Testing thermostats and their wiring for proper operation.

S-9 Checking Air Circulator Blower Motor or Induced Draft Blower Motor

Procedures for checking blower motors for continuity and ground.

Caution

Caution about proper polarization and grounding.

S-15 Checking Main Burners

Checking main burners for signs of rust, port condition, and alignment.

S-17 High Altitude Application (USA)

Chart for high altitude orifice drill sizes and conversion kits.

S-19 Checking for Delayed Ignition

Checks to perform if delayed ignition occurs.

S-12 Checking Hot Surface Ignitor

Testing hot surface ignitors for resistance and current draw.

Gas Valve Adjustment Procedures for GUIS/GCIS/GUIV Two-Stage Furnaces

Procedures for adjusting gas valve regulators on two-stage furnaces.

S-8 Checking Pressure Switch

Purpose and function of the pressure control safety device.

Wiring Diagrams

Warning

Warning about electrical shock and proper wiring.

Schematics

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