NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS
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.
Recognize safety information. This is the safety-alert symbol .
When you see this symbol on the product or in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words — DANGER, WARNING, CAU-
TION, and NOTE. Danger identifies the most serious hazards,
which will result in severe personal injury or death. Warning
indicatesacondition that could cause serious personal injury or
death. Caution is used to identify unsafe practices, which would
result in minor personal injury or product and property damage.
NOTEis used to highlight suggestions which will result in
enhanced installation, reliability, or operation.
Note to Installer: This manual should be left with the equipment
user.
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 callaqualified 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.
WARNING: Before performing recommended mainte-
nance, be sure the main power switch to unit is turned off
and lock-out tag installed. Electric shock could cause
serious injury or death.
UNITINTRODUCTION
This 574B unit isasmall packaged gas heat/electric cooling
system that can utilize the comfort of gas heating packaged along
with efficient electric air conditioning. This unit uses Puron®, the
ozone friendly refrigerant for cooling.
Starting or Shutting Unit Off
1. To start the unit:
a. Turn on the electrical and gas power supply to unit.
b. Select temperature and set SYSTEM switch or MODE
control to desired mode.
2. To shut unit off:
NOTE: If the unit is being shut down because ofamalfunction,
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.
OPERATING YOUR UNIT
The operation of your system is controlled by the indoor tempera-
ture control. You simply adjust the thermostat and it maintains the
indoor temperature at the level you select. Most thermostats of
heating and cooling systems have3controls:atemperature control
selector,aFAN control, andaSYSTEM or MODE control. Refer
to your thermostat owner’s manual for more information.
To better protect your investment and to eliminate unnecessary
service calls, familiarize yourself with the following facts:
I. COOLING MODE
With the SYSTEM or MODE control set to COOL, your unit will
run in cooling mode until the indoor temperature is lowered to the
level you have selected. On extremely hot days, your unit will run
for longer periods at a time and have shorter “off” periods than on
moderate days.
Fig. 1—Unit 574B
C99088
User Information Manual
574B
SINGLE-PACKAGED GAS HEAT/ELECTRIC COOLING
UNITWITH PURON® (R-410A) REFRIGERANT
Cancels: New OM10–20
6–03
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