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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 air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified personnel should install, repair, or service
air-conditioning equipment.
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 air-conditioning
equipment, observe precautions in the literature, tags, and labels
attached to the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguisher
available for all brazing operations.
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 factory-authorized kits or accesso-
ries when modifying this product.
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.
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 safety-alert symbol .
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 safety-alert symbol.
DANGER identifies the most serious hazards which will result in
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.
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 lock-out tag and
shut off gas supply to unit.
Fig. 1—Unit 674B
C99088
User Information Manual
674B
SINGLE-PACKAGED GAS HEAT/ELECTRIC
HEAT PUMP UNIT WITH
PURON® (R-410A) REFRIGERANT
Cancels: New OM10–21
1–04
—1—