Bryant 704B User Manual
User Information Manual
704B
SINGLE-PACKAGED ELECTRIC COOLING UNIT
WITH PURON® (R-410A) REFRIGERANT
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, CAUTION, 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 technician 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 maintenance, be sure the main power switch to unit is turned off.
Electric shock could cause serious injury or death.
STARTINGORSHUTTING UNITOFF
1. To start the unit:
a. Turn on the electrical power supply to unit.
Cancels: New OM01–61
6–03
C99064
Fig. 1—Unit 704B
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 supply to unit.
OPERATINGYOUR PACKAGEDCOOLING UNIT
The operation of your packaged cooling system is controlled by
the indoor thermostat. You simply adjust the thermostat and it
maintains the indoor temperature at the level you select. Most
thermostats of 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 system will
run for longer periods atatime and have shorter “off” periods than
on moderate days.
II. HEATING MODE (IF INSTALLED WITH OPTIONAL
ELECTRIC HEAT)
Your system may also be equipped with an electric heating source.
On cold days and nights, place your MODE control to HEAT and
your system will automatically turn on the supplemental heat in
order to maintain the level of comfort you have selected.
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MAINTENANCE AND SERVICE
This section discusses maintenance that should be performed by
your dealer and care you, as the owner, may wish to handle for
your new system.
A. Routine Maintenance
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard procedure.
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 ELECTRICAL POWER
TO YOUR UNIT BEFORE SERVICING OR PERFORMING MAINTENANCE. ELECTRIC SHOCK COULD
CAUSE SERIOUS INJURY OR
DEATH.
2. When removing access panels or performing maintenance 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.
TABLE 1—INDOOR-AIR FILTER DATA
UNIT SIZE FILTER SIZE
704B024-030 20x20x1
704B036 20x24x1
704B042-060 24x30x1
To replace or inspect filters in accessory filter rack (See Fig. 2):
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.
ACCESS PANEL
FILTER ACCESS
PANEL*
*For accessory filter rack.
C99094
Fig. 2—Accessory Filter Rack Access Panel
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 MOTOR
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 maintenance.
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.
CONDENSER FAN
CAUTION: Do not poke sticks, screwdrivers, or any
other objects into revolving fan blades. Injury or equipment 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 instrumentations. If there are any discrepancies in the operating cycle,
contact your dealer and request service.
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