Carrier Fan 50SD User Manual

50SD  
Single-Packaged Electric Cooling Units  
A Guide To Operating and MaintainingYour  
Single-Package Electric Cooling Unit  
NOTE TO INSTALLER  
This manual must be left with the equipment owner.  
Note to User: Please read all manuals and retain manuals for  
future reference.  
FOR YOUR SAFETY  
Do not store or use gasoline or other ammable vapors and  
liquids in the vicinity of this or any other appliance.  
!
WARNING  
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 under water.  
Immediately call a qualied service technician to inspect  
the unit and to replace any part of the control system which  
has been under water.  
Fig. 1—Unit 50SD  
MAINTENANCE AND CARE FOR THE  
EQUIPMENT OWNER  
Before proceeding with those things you might want to  
maintain yourself, please carefully consider the following:  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal  
injury, death.  
Before performing recommended maintenance, be sure  
the main power switch to unit is turned off.  
!
WARNING  
ELECTRICAL SHOCK AND CUT HAZARD  
TO START UNIT  
Step 1—Turn on the electrical power supply to unit.  
Failure to follow this warning could result in personal in-  
jury, death or property damage.  
Step 2—Select temperature and set system switch to desired  
mode.  
1. TURN OFF ELECTRICAL POWER TOYOUR UNIT  
BEFORE SERVICING OR PERFORMING MAINTE-  
NANCE.  
TO SHUT UNIT OFF  
If unit is being shut down because of a malfunction, call your  
dealer as soon as possible.  
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  
reduce sharp edges to a minimum, be extremely careful  
when handling parts or reaching into the unit.  
Step 1—Set temperature switch to OFF.  
Step 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.  
AIR FILTERS— Air lter(s) should be checked at least every  
3 or 4 weeks and changed or cleaned whenever it becomes  
dirty. Dirty lters produce excessive stress on the blower motor  
and can cause the motor to overheat and shut down. Table 1  
indicates the correct lter size for your unit. Refer to Fig 2 to  
access the lter(s).  
For your safety, keep the unit area clear and free of combustible  
materials, gasoline, and other ammable liquids and vapors.  
To assure proper functioning of the unit, ow 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).  
To replace or inspect lter(s) (or accessory lter rack when  
supplied):  
1. Remove the lter access panel using a 5/16-in. nut driver.  
 
9. Operational check of the unit to determine working  
conditions. Repair or adjustment should be made at this  
time.  
( ) Check to be sure that your thermostat temperature selector  
is set below the indoor temperature during the cooling season.  
Be sure the system switch is in the COOL position and not in  
the OFF position.  
Your servicing dealer may offer an economical service  
contract that covers seasonal inspections. Ask for further  
details.  
( ) 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.  
Complete maintenance instructions can be found in the unit  
Installation, Start-Up and Service Instructions.  
WARRANTY CERTIFICATES  
Unit 50SD has limited warranties. Certicates are located at  
the back of this book. Be sure to read the warranty carefully to  
determine the coverage for your unit.  
IN CASE OF TROUBLE  
If after performing the above and unit performance is still  
unsatisfactory, shut off the unit and call your dealer.  
BEFOREYOUR CALL FOR SERVICE, CHECK FOR SEVERAL  
EASLILY-SOLVED PROBLEMS  
If insufcient heating or cooling is suspected:  
Dealer’s Name  
Telephone  
( ) Check for sufcient airow. Check the air lter 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.  
Unit Model  
If your unit is not operating at all, check the following list for  
easy solutions:  
Unit Serial Number  
Download from Www.Somanuals.com. 3All Manuals Search And Download.  
Copyright 2005 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1  
4
PC 101  
Page 4  
Form/Catalog No. OM50-42  
Printed in U.S.A.  
8-05  
Replaces: New  
Tab 1b 1a  
 

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