Carrier Heat Pump 50EZ User Manual

50EZ  
Comfortr 13 SEER Single---Packaged Heat Pump  
System with Puron® (R---410A) Refrigerant  
Single and Three Phase  
2 --- 5 Nominal Tons (Sizes 024---060)  
Owner’s Information Manual  
C99001  
Fig. 1 - Unit 50EZ  
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  
INSTALLATION INFORMATION  
Model # _____________________________________  
Serial # ______________________________________  
Date Installed ________________________________  
DEALERSHIP CONTACT INFORMATION  
Company Name_______________________________  
Address______________________________________  
_____________________________________________  
Phone Number _______________________________  
Technician Name _____________________________  
_____________________________________________  
ACCESSORIES (List type and model #)  
_____________________________________________  
_____________________________________________  
_____________________________________________  
NOTE TO INSTALLER:  
This manual must be left with the equipment owner.  
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sorbed from the outside air. So, to maintain energy--efficient opera-  
tion, your unit has an automatic defrost mode.  
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 in-  
side the unit itself. The following information is given to assist in  
changing filters used in these internal filter racks.  
The defrost mode starts at a preset time interval of 60 minutes, al-  
though, it may be reset to 30, 90 or 120 minutes. Defrost will start  
at the preset time only if the ice is sufficient to interfere with normal  
heating operation.  
Table 1 indicates the correct indoor filter size for your unit. Refer  
to Fig. 2 to access filters installed in the accessory filterrack. Ifusing  
an Accessory Filter Rack, refer to the Installation Instructions pro-  
vided with it for correct filter sizes and quantities.  
After the ice is melted from the coil, or after a maximum of 10 min-  
utes in defrost mode, the unit automatically switches back to normal  
heating operation.  
Table 1—Air Filters Located Inside Unit  
(For Replacement Purposes)  
Do not be alarmed if steam or fog appears at the outdoor unit during  
defrost mode. Water vapor from the melting ice may condense into  
a mist in the cold outside air.  
Unit Size  
50EZ024  
Filter Size in. (mm)  
20x20x1 (508x508x25)  
20x24x1 (508x610x25)  
24x30x1 (610x762x25)  
24x36x1 (610x914x25)  
During certain weather conditions such as heavy snow and freezing  
rain it is not uncommon for ice to build up on the unit grille. This is  
normal for these weather conditions. Do not attempt to remove the  
ice from the unit grille. This condition will not affect the proper  
function of the unit and will clear within a few days.  
50EZ030  
50EZ036---042  
50EZ048---060  
Emergency Heating Mode  
To replace or inspect filters in accessory filter rack:  
In the event of primary unit heat failure, the emergency heat mode  
allows your supplemental heating source to keep your home or of-  
fice warm until your unit can be serviced. Contact your dealer in the  
event of primary unit heat failure.  
1. Remove the filter access panel (See Fig. 2) using a 5/16--in.  
nut driver.  
2. Removethefilter(s)by pulling itoutoftheunit.If thefilter(s)  
is dirty, clean or replace with a new one.  
MAINTENANCE AND SERVICE  
When installing the new filter(s), note thedirection ofthe airflow ar-  
rows on the filter frame.  
This section discusses maintenance that should be performed by  
your dealer and care you, as the owner, may wish to handle for your  
new unit.  
If you have difficulty locating your air filter(s) or have questions  
concerning proper filter maintenance, contact your dealer for in-  
structions. When replacing filters, always use the same size and type  
of filter that was supplied originally by the installer.  
Routine Maintenance  
All routine maintenance should be handled by skilled, experienced  
personnel. Your dealer can help you establish a standard procedure.  
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. (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) (305mm).  
Maintenance and Care for the Equipment Owner  
Before proceeding with those things you might want to maintain  
yourself, please carefully consider the following:  
!
WARNING  
FIRE,EXPLOSION,ELECTRICAL SHOCKHAZARD  
ACCESS PANEL  
FILTER ACCESS  
PANEL*  
Failure to follow this warning could result in personal injury,  
death or property damage.  
*For accessory filter rack.  
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT  
C99094  
BEFORE  
SERVICING  
OR  
PERFORMING  
MAINTENANCE AND INSTALL A LOCK--OUT TAG.  
Fig. 2 - Accessory Filter Rack Access Panel  
(Optional Louvered Panels shown)  
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.  
!
WARNING  
FIRE AND UNIT OPERATION HAZARD  
Failure to follow this warning could result in personal injury,  
death or property damage.  
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.  
Never operate your unit without filters in place. An  
accumulation of dust and lint on internal parts of your unit can  
cause loss of efficiency.  
Fans and Fan Motor  
This unit must have an air filter in place before it can be operated.  
These filters should be located in at least one of 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  
Periodically check the condition of fan wheels and housings and  
fan--motorshaftbearings.Contactyourdealerforthe requiredannu-  
al maintenance.  
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Indoor and Outdoor Coils  
trained service technician. An inspection (preferably each year, but  
at least every other year) should include the following:  
Cleaning of the coils should only be done by qualified service per-  
sonnel. Contact your dealer for the required annual maintenance.  
1. Inspection and, if required, cleaning of the outdoor and  
indoor coils.  
Condensate Drain  
2. Inspection and, if required, cleaning of the indoor coil drain  
pan.  
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.  
3. Inspection and cleaning of blower wheelhousing andmotor.  
Compressor  
4. Inspection of all supply and return air ducts for leaks,  
obstructions, and insulation integrity. Any problems found  
should be resolved at this time.  
All compressors arefactory shippedwith anormal chargeof thecor-  
rect type and quantity of refrigeration grade oil. A compressor  
should rarely require additional oil.  
5. Inspectionof theunit baseto ensurethat nocracks, gaps,etc.,  
exist which may cause a hazardous condition.  
Condenser Fan  
6. Inspection of the unit casing for signs of deterioration.  
!
7. Inspection of all electrical wiring and components to assure  
proper connection.  
WARNING  
PERSONAL INJURY AND UNIT DAMAGE HAZARD  
8. Inspection for leaks in the refrigerant circuit. Pressure and  
temperature check to determine appropriate refrigerant  
charge.  
Failure to follow this warning could result in personal injury,  
death or property damage.  
Do not poke sticks, screwdrivers, or any other object into  
revolving fan blades.  
9. Operational check of the unit to determine working  
conditions.Repairoradjustmentshouldbe madeat thistime.  
Your servicing dealer may offer an economical service contract that  
covers seasonal inspections. Ask for further details.  
The fan must be kept free of all obstructions to ensure proper cool-  
ing. Contact your dealer for any required service.  
Complete service instructions can be found in the unit Installation,  
Start--up and Service Instructions.  
Electrical Controls and Wiring  
Electrical controlsare difficultto checkwithout properinstrumenta-  
tion. If there are any discrepancies in the operating cycle, contact  
your local dealer and request service.  
Warranty Certificate  
Your unit has a limited warranty. Be sure to read the warranty care-  
fully to determine the coverage for your unit.  
Refrigerant Circuit  
Before you call for service...  
Therefrigerantcircuitisdifficulttocheckforleakswithout theprop-  
er equipment. If inadequate cooling is suspected, contact your local  
dealer 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  
forblockedreturnor supplyair grilles. Be surethey areopen and un-  
obstructed. If these checks do not reveal the cause, call your servic-  
ing dealer.  
!
WARNING  
EXPLOSION, BURN AND ENVIRONMENTAL  
HAZARD  
If your unit is not operating at all, check the following list for  
easy solutions:  
Failure to follow this warning could result in personal injury,  
death or property damage.  
( ) Check to be sure that your thermostat temperature selector is set  
below the indoor temperature during the cooling season or above  
theindoortemperatureduring heatingseason. Besure theSYSTEM  
switch or MODE control is in the COOL or HEAT and not OFF.  
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.  
(
) If your unit still fails to operate, call your servicing dealer for  
Unit Panels  
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 of-  
fer suggestions over the phone, or save valuable time through  
knowledgeable preparation for the service call.  
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 Case of Trouble  
In addition to the type of routine maintenance you might be willing  
to perform, your unit should be inspected regularly by a properly  
If you perform the steps above and unit performance is still unsatis-  
factory, shut off the unit and call your dealer.  
HEATING & COOLING  
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 2008 Carrier Corporation  
Printed in the U.S.A.  
Edition Date: 02/08  
Catalog No: OM50EZ---01  
Manufacturer reserves the right to change, at any time, specifications and design without notice and without obligation.  
Replaces: OM50---55  
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