Carrier 50SD Instruction Manual

_rn to the Expertg[
Owner's Information Manual
Fig. 1 - Unit 50SD
C99062
NOTE TO EQUIPMENT OWNER:
For your convenience, please record the model and serial numbers of your new equipment in the spaces
provided. This information, along with the installation data and dealer contact information, will be helpful
should your system require maintenance or service.
UNIT INFORMATION
Model #
Serial #
ACCESSORIES (List type and model #)
INSTALLATION INFORMATION
Date Installed
DEALERSHIP CONTACT INFORMATION
Company Name
Address
Phone Number
Technician Name
NOTE TO INSTALLER:
This manual must be left with the equipment owner,

SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be hazardous due to
mechanical and electrical components. Only trained and qualified
personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on this
equipment, observe precautions in the literature, on tags, and on la-
bels attached to or shipped with the unit and other safety precautions
that may apply.
Follow all safety codes. Installation must be in compliance with lo-
cal and national building codes. Wear safety glasses, protective
clothing, and work gloves. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit.
Recognize safety information. This is the safety-alert symbol/_
When you see this symbol on the unit and in instructions or manuals.
be alert to the potential for personal injury.
Understand these signal words: DANGER, WARNING. and CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies hazards which could
result in personal injury or death. CAUTION is used to identify un-
safe practices which may 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.
Note: Installer: This manual should be left with the equipment user.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death, personal
injury and/or property damage.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
Do not use this unit if any part has been underwater.
Immediately call a qualified service technician to inspect the
unit and to replace any part of the control system which has
been underwater.
ELECTRICAL SHOCK AND CUT HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
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 reduce sharp
edges to a minimum, be extremely careful when handling
parts or reaching into the unit.
TO START UNIT:
1. Turn on the electrical power supply to the unit.
2. Select temperature and set system switch to desired mode.
TO SHUT OFF UNIT:
Note: If the unit is being shut down because of a malfunction, call
your dealer as soon as possible.
1. Set the temperature switch to OFF.
2. Turn off the electrical power supply to unit.
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 nmst
not be obstructed from reaching the unit. Clearance from the top of
the unit is 48 in. (1219 mm). Clearance of at least 36 in. (914 mm)
is required on sides except the power entry side (42 in. clearance)
(1067 mm) and the duct side (12 in. minimum clearance) (305 mm).
Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to maintain
vourself, please carefully consider the following:
FIRE, EXPLOSION, ELECTRICAL SHOCK AND
CUT HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT
BEFORE SERVICING OR PERFORMING
MAINTENANCE.
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 reduce
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 every 3 or 4 weeks and changed
or cleaned whenever it becomes dirty. Dirty filters produce exces-
sive 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 indoor filter size for your unit. Refer to
Fig. 2 to access filters installed in the accessory filter rack. If using
an Accessory Filter Rack. refer to the Installation Instructions
provided with it for correct filter sizes and quantities.
Table I--Indoor Air Filter Data
Unit Size Filter Size
018-030 20x24x1 (508x610x25 mm)
036 24x30x1 (610x762x25 mm)
042-060 24x36x1 (610x914x25 mm)
To replace or inspect filters in accessory filter rack (See Fig. 6):
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.

Wheninstallingthenewfilter(s),notethedirectionoftheairflow
arrowsonthefilterframe.
Ifyouhavedifficultylocatingyourairfilter(s)orhavequestions
concerningproperfiltermaintenance,contactyourdealerfor
instructions.Whenreplacingfilters,alwaysusethesamesizeand
typeoffilterthatwassupplied,originally,bytheinstaller.
FIREANDUNITOPERATIONHAZARD
Failuretofollowthiswarningcouldresultinpersonalinjury,
deathorpropertydamage.
Neveroperateyourunitwithoutfiltersin place.An
accumulationofdustandlintoninternalpartsofyourunitcan
causelossofefficiency.
ACCESS PANEL
FILTER ACCESS
PANEL*
*For accessory filter rack.
C99094
Fig. 2 -Accessory Filter Rack Access Panel
(Optional Louvered Panels Shown)
Fans and Fan Motors
Periodically check the condition of fan wheels and housings and
fan-motor shaft bearings. No lubrication of condenser-or
evaporator-fan bearings or motors is required or recommended.
Indoor and Outdoor Coils
Cleaning of the coils should only be done by qualified service per-
sonnel. 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 deal-
er.
Compressor
All compressors are factory shipped with a normal charge of the cor-
rect type of refrigeration grade oil in them and should rarely require
additional oil.
Condenser Fan
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
Do not insert sticks, screwdrivers, or any other object into
revolving fan blades.
The fan must be kept free of all obstructions to ensure proper cool-
ing. Contact your dealer for any required service.
Electrical Controls and Wirin_
Electrical controls are difficult to check without proper instrumenta-
tion. If there are any discrepancies in the operating cycle, contact
your local dealer and request service.
Refri_,erant Circuit
The refrigerant circuit is difficult to check for leaks without the prop-
er equipment. If inadequate cooling is suspected, contact your local
dealer for service.
EXPLOSION AND ENVIROMENTAL HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
System under pressure. Relieve pressure and recover all
refrigerant before system repair or final unit disposal. 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 pat-
tern.
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 indoor coil
condensate drain.
2. Inspection and. if required, cleaning of the evaporator 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 ensure
proper connection.
8.
9.
10.
Inspection for leaks in the refrigerant circuit. Pressure-check
to determine appropriate refrigerant charge.
Inspection of compressor oil level by service person to
ensure proper oil level is maintained in the compressor when
it is installed and running.
Operational check of the unit to determine working
conditions. 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.

WarrantyCertificate
Your 50SD unit has a limited warranty. Be sure to read the warranty
carefully to determine the coverage for your unit.
Before you call for service...
...check for several easily-solved problems.
If insufficient heating or cooling is suspected:
Check for sufficient airflow.
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. Be sure the
SYSTEM switch or MODE control is in the COOL 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.
In Case of Trouble
If you perform the steps above and unit performance is still unsatis-
factory, shut off the unit and call your dealer.
Dealer's Name
Telephone
Unit Model
Unit Serial Number
®
Turn to the Experts:
TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or classified section of your local telephone directory under the
"Heating Equipment" or "Air Conditioning Contractors & Systems" heading for dealer listing by brand name.
Have available the Model No.. Series Letter. & Serial No. of your equipment to ensure correct replacement part.
Copyright 2007 Carrier Corporation Printed in the US.A. Edition Date: 08/07
Manufacturer reserves the right to change, at any tirne_ specifications and design without notice and without obligation. Catalol_ No: 0M50-60
Replaces: 0M50-58