Introduction - International comfort products N9MP1 Service Manual

Service Manual
This service manual is designed to be used in conjunction
with the installation manual and/or technical support manu-
al provided with each furnace.
These furnaces represent the very latest in high efficiency
gas furnace technology. Consequently, they incorporate
the use of certain controls that contain highly sophisticated
electronic components which are not user serviceable.
Therefore, it is essential that only competent, qualified, ser-
vice personnel attempt to install, service, or maintain this
product.
This Service manual was written to assist the professional
HVAC service technician to quickly and accurately diag-
nose and repair any malfunction of this product.
Recognize safety information. This is the safety−alert symbol
the potential for personal injury.
Understand the signal words DANGER, WARNING, or CAUTION. These words are used with the safety−alert symbol. DANGER identifies the most
serious hazards, those that will result in severe personal injury or death. WARNING signifies a hazard that could result in personal injury or death.
CAUTION is used to identify unsafe practices that could result in minor personal injury or product and property damage. NOTE is used to highlight
suggestions that will result in enhanced installation, reliability, or operation.
Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and qualified personnel should
install, repair, or service heating equipment.
Untrained service personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be per-
formed by trained service personnel. When working on heating equipment, observe precautions in the literature, on tags, and on labels attached to or
shipped with the unit and other safety precautions that may apply.
Follow all safety codes. In the United States, follow all safety codes including the current edition National Fuel Gas Code (NFGC) ANSI
Z223.1−2002/NFP A No. 54−2002. In Canada, refer to the current edition of the National Standard of Canada Natural Gas and Propane Installation
Code (NSCNGPIC) CSA B149.1−05. Wear safety glasses and work gloves. Have fire extinguisher available during start−up and adjustment proce-
dures and service calls.
These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances, these instructions
exceed certain local codes and ordinances, especially those that may not have kept up with changing residential construction practices. We require
these instructions as a minimum for a safe installation.
4

INTRODUCTION

This service manual covers the following models;
*9MPD− − − − − − C or later, *9MP1 − − − − − − C or
later and *9MP2 − − − − − − C or later models. The overall
operation of all of these models is essentially the same.
This manual, therefore, will deal with all subjects in a gener-
al nature (I.E. all text will pertain to all models) unless that
subject is unique to a particular model or family, in which
case it will be so indicated.
It will be necessary then for you to accurately identify the
unit you are servicing, so you may be certain of a proper
diagnosis and repair. (See Unit Identification, Page 3)
SAFETY REQUIREMENTS
!
. When you see this symbol on the furnace and in instructions manuals be alert to
International Comfort Products LLC
c
Lewisburg, TN 37091
Single Stage Multi Position Furnace
440 08 2011 00