User Information Manual
674B
PURON®
NOTE: Read the entire instruction manual before starting the installation.
SAFETY CONSIDERATIONS
Note to Installer: This manual should be left with the equipment user.
Installation and servicing of
Untrained personnel can perform basic maintenance functions of cleaning coils and filters. All other operations should be performed by trained service personnel. When working on
WARNING: Improper installation, adjustment, alter- ation, service, maintenance, or use can cause carbon monoxide poisoning, fire, or an explosion which could result in personal injury or unit damage. Consult a qualified installer, service agency, or gas supplier for information or assistance. The qualified installer or agency must use only
WARNING: Before performing service or maintenance operations on unit, turn off gas supply to unit. Then turn off unit main power switch. Electrical shock or explosion could cause serious injury or death.
WARNING: Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. Failure to follow this warning could result in fire, serious injury, or death.
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severe personal injury or death. WARNING signifies a hazard which could result in personal injury or death. CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
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 residen- tial construction practices. We require these instructions as a minimum for a safe installation.
UNIT INTRODUCTION
This 674B unit is a small packaged gas heat/electric heat pump system that can utilize both the efficiency of heat pump heating and the comfort of gas heating. The system will optimize for ideal heating, depending on several factors. This unit uses Puron®, the ozone friendly refrigerant for cooling and heat pump heating.
C99088
WARNING: Do not use this unit if any part has been under water. Immediately call a qualified service techni- cian to inspect the unit and to replace any part of the control system which has been under water. Failure to follow this warning could result in electrical shock, fire, serious injury, or death.
Recognize safety information. This is the 
. When you see this symbol in instructions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the
Fig. 1—Unit 674B
Starting or Shutting Unit Off
1.To start the unit:
a.Turn on the electrical and gas power supply to unit.
b.Select desired temperature on thermostat and set SYS- TEM switch or MODE control to desired mode.
2.To shut unit off:
NOTE: If the unit is being shut down because of a malfunction, call your dealer as soon as possible.
a.Set system SWITCH or MODE control to OFF.
b.Turn off the electrical power, install
