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VZ-VZH-VZT-IOM (08-24) 1047121-A
GENERAL INFORMATION
• This heater has been tested for capacity and efficiency so as to provide many years of safe and dependable comfort
providing it is properly installed and maintained. With regular maintenance, this unit will operate satisfactorily year
after year. Abuse, improper use, and/or improper maintenance can shorten the life of the appliance and create
unsafe hazards.
• To achieve optimum performance and minimize equipment failure, it is recommended that periodic maintenance
be performed on this unit. The ability to properly perform maintenance on this equipment requires certain tools
and mechanical skills.
• This manual applies only to the models listed. Accessories referenced may not apply to all models.
Model Features
• Model VZ (single-stage burner) and model VZT (two-stage (low- and high-fire) burner): features painted
burner cabinet with external blower and motor assembly—designed for non-harsh environment indoor installations.
• Model VZH: features stainless steel burner cabinet with integral blower and motor assembly—designed for harsh
environment indoor and outdoor installations.
Important Safety Information
Please read all information in this manual thoroughly and become familiar with the capabilities and use of your
appliance before attempting to operate or maintain this unit. Pay attention to all dangers, warnings, cautions, and
notes highlighted in this manual. Safety markings should not be ignored and are used frequently throughout to
designate a degree or level of seriousness.
DANGER: A danger statement describes a potentially hazardous situation that if not avoided, will result in severe
personal injury or death and/or property damage.
WARNING: A warning statement describes a potentially hazardous situation that if not avoided, can result in severe
personal injury and/or property damage.
CAUTION: A caution statement describes a potentially hazardous situation that if not avoided, can result in minor
or moderate personal injury and/or property damage.
NOTE: A note provides important information that should not be ignored.
TABLE OF CONTENTS—CONTINUED
ADJUSTMENTS...........................................................................43
High-Elevation and Propane Conversion ......................................................43
Measure and Adjust Manifold Gas (Outlet) Pressure .............................................43
MAINTENANCE...........................................................................44
Service Checklist.........................................................................45
Maintenance Procedures ..................................................................45
Burner Assembly Maintenance ...........................................................46
Blower and Motor Assembly Maintenance ...................................................46
Combination Gas Valve Maintenance ......................................................46
Ignition Control Module Replacement ......................................................47
Pressure Switch Replacement ............................................................47
TROUBLESHOOTING......................................................................48
General Troubleshooting...................................................................48
Troubleshooting Using Ignition Control Module .................................................48
APPENDIX: SWIRLER CONFIGURATIONS ....................................................49
APPENDIX: L-TUBE REFLECTORS ..........................................................55
INSTALLATION RECORD (TO BE COMPLETED BY INSTALLER) ..................................56
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