Thermo Products MHA1-125, MDA1-75, CDX1-125, MHA1-100, MHA1-50 User Manual

GAS FURNACE

HIGHBOY AND COUNTERFLOW
USERS INFORMATION MANUAL

MODELS

FOR USE WITH NATURAL GAS OR LP GAS (PROPANE)

CHB1-50 CDB1-50 MHA1-50 MDA1-50
CHX1-75 CHB1-75 CDX 1-75 CDB1-75 MHA1-75 MDA1-75
CHX1-100 CHB1-100 CDX1-100 CDB1-100 MHA1-100 MDA1-100
CHX1-125 CHB1-125 CDX1-125 CDB1-125 MHA1-125 MDA1-125

: IF YOU DO NOT FOLLOW THE SAFETY PRECAUTIONS BELOW AND IN THIS MANUAL, A

FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF
LIFE.

DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE
VICINITY OF THIS OR ANY OTHER APPLIANCE.

WHAT TO DO IF YOU SMELL GAS:

• DO NOT TRY TO LIGHT ANY APPLIANCE.

• DO NOT TOUCH ANY ELECTRICAL SWITCH; DO NOT USE ANY PHONE IN YOUR BUILDING.

• LEAVE THE BUILDING IMMEDIATELY.

• IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR’S PHONE. FOLLOW THE GAS

SUPPLIER’S INSTRUCTIONS.

• IF YOU CANNOT REACH YOUR GAS SUPPLIER; CALL THE FIRE DEPARTMENT.

INSTALLATION AND SERVICE MUST BE PERFORMED BY A QUALIFIED INSTALLER, SERVICE
AGENCY OR THE GAS SUPPLIER. (REFERRED TO IN THESE INSTRUCTIONS AS A QUALIFIED
HEATING CONTRACTOR).

PLEASE READ THESE INSTRUCTIONS PRIOR TO INITIAL FIRING, OPERATING THE FURNACE, AND
BEFORE PERFORMING ANY MAINTENANCE. THESE INSTRUCTIONS MUST BE LEFT WITH THE
HOMEOWNER AND SHOULD BE RETAINED FOR FUTURE REFERENCE BY THE HOMEOWNER/USER.

THERMO PRODUCTS, LLC.
BOX 217
MG-1012 NORTH JUDSON, IN 46366

ECN 4456-MA PHONE: [phone] MADE IN USA

INDEX

SECTION BEGINNING PAGE

I. SAFETY INFORMATION 1

II. GENERAL INSTRUCTIONS 5

III. FURNACE OPERATION 10

A. WARNINGS BEFORE OPERATING 10
B. OPERATING INSTRUCTIONS 10
C. SHUTDOWN PROCEDURE 11

IV. HOMEOWNER/USER MAINTENANCE INSTRUCTIONS 11
(ROUTINE MAINTENANCE)

A. ANNUAL INSPECTION 11
B. FILTER MAINTENANCE PROCEDURE 12
C. VISUAL INSPECTION PROCEDURE 14

All installations and services must be performed by qualified service personnel.

I. SAFETY INFORMATION

This and the following page contain reproductions of the various warning and instruction labels
placed on the Thermo Pride Condensing Gas Furnaces. Please read and comply with the contents
of these labels.

1

All installations and services must be performed by qualified service personnel.

This and the previous page contain reproductions of the various warning and instruction
labels placed on the Thermo Pride Two Stage Condensing Gas Furnaces. Please read and
comply with the contents of these labels.

2

All installations and services must be performed by qualified service personnel.

3

All installations and services must be performed by qualified service personnel.

This page contains various warnings and cautions found throughout this manual. Please
read and comply with the statements below.

: IF YOU DO NOT FOLLOW THE SAFETY PRECAUTIONS BELOW AND IN THIS MANUAL, A

FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF
LIFE.

: Property damage, personal injury, or loss of life could result from repair or service of
this furnace by anyone other than a qualified heating contractor. Only the routine maintenance
described in this manual may be performed by the user.

: To avoid injury from moving parts, shut off the power to the furnace before
removing blower compartment door.

: Keep furnace free and clear of combustible materials, gasoline, and other flammable
liquids and vapors.

: Do not use this furnace if any part has been under water. Immediately call a qualified
heating contractor to inspect the furnace and to replace any part of the control system and any gas
control which has been under water.

: If you suspect there is a problem with the furnace, its venting system or any other
related problem, immediately contact a qualified service agency.

: In the event your furnace fails to operate, do not attempt to put the furnace into
operation. Contact a qualified heating contractor to service the furnace.

: A fire or explosion may result causing property damage, personal injury or loss of
life if you do not follow these instructions exactly.

: Homeowners attempting maintenance other than that covered as homeowner/user
maintenance may cause conditions which could result in personal injury or property damage.

: Shut off the power to the furnace before removing blower compartment door to avoid
injury from moving parts.

: This furnace is not to be used for temporary heating of buildings or structures under
construction.

: Call a qualified heating contractor to report suspected deficiencies (Do not attempt to
make repairs yourself!)

4