Bryant 574B Guide

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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II. GAS HEAT MODE
With the SYSTEM or MODE control set to HEAT, your unit will
run in heating mode until the indoor temperature is raised above
the level you have selected. On extremely cold days, your unit will
run for longer periods at a time and have shorter “off” periods than
on moderate days.
MAINTENANCE AND SERVICE
This section discusses maintenance that should be performed on
your system. Most maintenance should be performed by your
dealer. You, as the owner, may wish to handle some minor
maintenance for your new unit.
A. Routine Maintenance
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard proce-
dure.
For your safety, keep the unit area clear and free of combustible
materials, gasoline, and other flammable liquids and vapors.
To assure proper functioning of the unit, flow of condenser air
must not be obstructed from reaching the unit. Clearance from the
top of the unit is 48 in. Clearance of at least 36 in. is required on
sides except the power entry side (42 in. clearance) and the duct
side (12 in. minimum clearance).
B. Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to maintain
yourself, please carefully consider the following:
WARNING: 1. TURN OFF ALL ELECTRICAL
POWER TO YOUR UNIT AND IN-
STALL LOCK-OUT TAG BEFORE
SERVICING OR PERFORMING
MAINTENANCE. ELECTRIC
SHOCK COULD CAUSE SERIOUS
INJURY OR DEATH.
2. When removing access panels or performing mainte-
nance functions inside your unit, be aware of sharp
sheet metal parts and screws. Although special care is
taken to keep sharp edges to a minimum, be extremely
careful when handling parts or reaching into the unit.
AIR FILTERS
The air filter(s) should be checked at least every 3 or 4 weeks and
changed or cleaned whenever it becomes dirty. Dirty filters
produce excessive stress on the blower motor and can cause the
motor to overheat and shut down.
This unit must have air filters in place before it can be operated.
These filters can be located in one of at least two places. In many
applications the installer will provide return air filter grilles
mounted on the wall or ceiling of the conditioned structure. In the
instance of filter grilles, the filters can simply be removed from the
grille and replaced.
The other typical application is an accessory filter rack installed
inside the unit itself. The following information is given to assist
in changing filters used in these internal filter racks.
Table 1 indicates the correct filter size for your unit. Refer to Fig.
2 to access filters installed in the accessory filter rack.
To replace or inspect filters (or accessory filter rack when
supplied):
1. Remove the filter access panel using a 5/16-in. nut driver.
2. Remove the filter(s) by pulling it out of the unit. If the
filter(s) is dirty, clean or replace with a new one.
When installing the new filter(s), note the direction of the airflow
arrows on the filter frame.
If you have difficulty locating your air filter(s) or have questions
concerning proper filter maintenance, contact your dealer for
instructions. When replacing filters, always use the same size and
type of filter that was supplied, originally, by the installer.
CAUTION: Never operate your unit without the filter(s)
in place. Failure to heed this warning may result in
damage to the blower motor and/or compressor. An
accumulation of dust and lint on internal parts of your
unit can cause loss of efficiency and , in some cases, a
fire.
FANS AND FAN MOTORS
Periodically, check the condition of fan wheels and housings and
fan-motor shaft bearings. Contact your dealer for the required
annual maintenance.
INDOOR AND OUTDOOR COILS
Cleaning of the coils should only be done by qualified service
personnel. Contact your dealer for the required annual mainte-
nance.
CONDENSATE DRAIN
The drain pan and condensate drain line should be checked and
cleaned at the same time the cooling coils are checked by your
dealer.
COMPRESSOR
All compressors are factory-shipped with a normal charge of the
correct type refrigeration grade oil. A compressor should rarely
require additional oil.
TABLE 1—INDOOR-AIR FILTER DATA
UNIT SIZE FILTER SIZE
574B024-030 20x20x1
574B036 20x24x1
574B042-060 24x30x1
Fig. 2—Filter Access Panel-Vertical Supply Shown
C99094
ACCESS PANEL
FILTER ACCESS
PANEL*
*For accessory filter rack.
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CONDENSER (OUTDOOR) FAN
CAUTION: Do not poke sticks, screwdrivers, or any
other objects into revolving fan blades. Injury or equip-
ment damage may result.
The fan must be kept free of all obstructions to ensure proper
cooling. Contact your dealer for any required service.
ELECTRICAL CONTROLS AND WIRING
Electrical controls are difficult to check without proper instrumen-
tations. If there are any discrepancies in the operating cycle,
contact your dealer and request service.
REFRIGERANT CIRCUIT
The refrigerant circuit is difficult to check for leaks without the
proper equipment. If inadequate cooling is suspected, contact your
local dealer for service.
WARNING: System under pressure. Relieve pressure
and recover all refrigerant before system repair or final
unit disposal to avoid serious injury or death. Use all
service ports and open all flow-control devices, including
solenoid valves.
UNIT PANELS
After performing any maintenance or service on the unit, be sure
all panels are fastened securely in place to prevent rain from
entering unit cabinet and to prevent disruption of the correct unit
airflow pattern.
C. Regular Dealer Maintenance
In addition to the type of routine maintenance you might be willing
to perform, your unit should be inspected regularly by a properly
trained service technician. An inspection (preferably each year, but
at least every other year) should include the following:
1. Inspection and, if required, cleaning of the outdoor and
indoor coils.
2. Inspection and, if required, cleaning of the indoor coil drain
pan.
3. Inspection and cleaning of blower wheel housing and
motor.
4. Inspection of all supply-air and return-air ducts for leaks,
obstructions, and insulation integrity. Any problems found
should be resolved at this time.
5. Inspection of the unit base to ensure that no cracks, gaps,
etc., exist which may cause a hazardous condition.
6. Inspection of the unit casing for signs of deterioration.
7. Inspection of all electrical wiring and components to assure
proper connection.
8. Inspection for leaks in the refrigerant circuit. Pressure-
check to determine appropriate refrigerant charge.
9. Operational check of the unit to determine working condi-
tions. Repair or adjustment should be made at this time.
Your servicing dealer may offer an economical service contract
that covers seasonal inspections. Ask for further details.
Complete service instructions can be found in the unit Installation,
Start-Up and Service Instructions.
D. Warranty Certificate
Unit 574B has a limited warranty. Be sure to read the warranty
carefully to determine the coverage for your unit.
E. Before You Call for Service ...
...check for several easily-solved problems.
If insufficient heating or cooling is suspected:
( ) Check the air filter for dirt. Check for blocked return-air or
supply-air grilles. Be sure they are open and unobstructed. If these
checks do not reveal the cause, call your servicing dealer.
If your unit is not operating at all, check the following list for
easy solutions:
( ) Check to be sure that your thermostat temperature selector is set
below the indoor temperature during the cooling season or above
the indoor temperature during heating season. Be sure the SYS-
TEM switch or MODE control is in the COOL or HEAT position
and not in the OFF position.
( ) If your unit still fails to operate, call your servicing dealer for
troubleshooting and repairs. Specify the model and serial numbers
of your unit. (Record them in this manual in the space provided.)
If the dealer knows exactly which unit you have, he may be able
to offer suggestions over the phone, or save valuable time through
knowledgeable preparation for the service call.
F. In Case of Trouble
If you perform the steps above and unit performance is still
unsatisfactory, shut off the unit and call your dealer.
Dealer’s Name ______________________________________
Telephone__________________________________________
Unit Model_________________________________________
Unit Serial Number___________________________________
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© 2003 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231 —4— Printed in U.S.A. om10–20 Catalog No. 5357–401