Carrier Heat Pump 50EZ A User Manual

50EZ---A and 50VT---A  
Comfort™ and Performance™ 13 and 14 SEER  
Single Packaged Heat Pump System  
With PuronR (R---410A) Refrigerant  
Single and Three Phase  
2 --- 5 N o m i n a l To n s ( S i z e s 2 4 --- 6 0 )  
Owner’s Information Manual  
A09033  
A09034  
Unit 50VT--A without Economizer  
Unit 50EZ--A without Economizer  
A10078  
A10077  
Unit 50VT--A with Economizer  
Fig. 2 -- Unit 50VT--A  
Unit 50EZ--A with Economizer  
Fig. 1 -- Unit 50EZ--A  
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amount of heat absorbed from the outside air. So, to maintain  
energy--efficient operation, your unit has an automatic defrost  
mode.  
!
CAUTION  
CUT HAZARD  
The defrost mode starts at a preset time interval of 60 minutes,  
although, 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.  
After the ice is melted from the coil, or after a maximum of 10  
minutes in defrost mode, the unit automatically switches back to  
normal heating operation.  
Failure to follow this caution may result in personal injury.  
Sheet metal parts may have sharp edges or burrs. Use care  
and wear appropriate protective clothing, safety glasses and  
gloves when handling parts and servicing furnaces.  
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.  
OPERATING YOUR UNIT  
The operation of your heat pump 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 heat pump systems have 3 controls: a temperature  
control selector, a FAN control, and a SYSTEM or MODE control.  
Refer to your thermostat owner’s manual for more information.  
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.  
To better protect your investment and to eliminate unnecessary  
service calls, familiarize yourself with the following facts:  
Emergency Heating Mode  
In the event of primary unit heat failure, the emergency heat mode  
allows your supplemental heating source to keep your home or  
office warm until your unit can be serviced. Contact your dealer in  
the event of primary unit heat failure.  
1. During heating, increasing the desired temperature setting  
more than 2°F (1.1°C) may cause the supplemental heaters  
to be turned on for a short period of time to satisfy the  
demand. Needless use of the supplementary heat reduces  
potential energy savings.  
2. Ice or frost tends to form on the coil during winter heating  
operation. Your unit is designed to automatically melt the  
ice. When in this defrost cycle, it is normal for steam or  
fog to rise from the outdoor unit, and for water to drain  
from the outside of unit. Do not be alarmed!  
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 unit.  
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.  
[1067 mm] clearance) and the duct side (12 in. [305 mm]  
minimum clearance).  
To start the unit:  
1. Turn on the electrical power supply to unit.  
2. Set MODE control to desired mode and select temperature.  
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 system MODE control to OFF.  
2. Turn off the electrical power supply to unit.  
Cooling Mode  
Maintenance and Care for the Equipment Owner  
Before proceeding with those things you might want to maintain  
yourself, please carefully consider the following:  
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.  
!
WARNING  
FIRE, EXPLOSION, ELECTRICAL SHOCK, CUT  
HAZARD  
Heating Mode  
Failure to follow this warning could result in personal  
injury, death or property damage.  
With the SYSTEM or MODE control set to HEAT, your unit will  
run in heating mode until the room temperature is raised to the  
level you have selected. Of course, your unit will run for longer  
periods to maintain a comfortable environment on cooler days and  
nights than on moderate ones.  
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT  
BEFORE  
SERVICING  
OR  
PERFORMING  
MAINTENANCE AND INSTALL A LOCK--OUT  
TAG.  
Supplemental Heat  
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.  
Your unit is your primary heating source. Your system may also be  
equipped with a supplemental heating source such as electric heat.  
On cold days and nights, your system will automatically turn on  
the supplemental heat, as needed, in order to maintain the level of  
comfort you have selected.  
When your heat pump needs additional heat to keep you  
comfortable your thermostat will turn on the supplemental heat (if  
equipped).  
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  
excessive stress on the blower motor and can cause the motor to  
overheat and shut down.  
Defrost Mode  
When your unit is providing heat to your home or office and the  
outdoor temperature drops below 45°F (7.2°C), moisture may  
begin to freeze on the surface of the coil. If allowed to build up,  
this ice would impede airflow across the coil and reduce the  
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  
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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. 3 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 1 – Air Filters Located Inside Unit  
(For Replacement Purposes)  
Unit Size  
A24  
Filter Size in. (mm)  
20x20x1 (508x508x25)  
20x24x1 (508x610x25)  
24x30x1 (610x762x25)  
24x36x1 (610x914x25)  
RETURN  
A30  
DUCT COVER  
(Remove for  
filter access)  
A36---A42  
A48---A60  
To replace or inspect filters in accessory filter rack:  
SMALL CHASSIS  
A10063  
1. Remove the filter access panel (See Fig. 3) using a 5/16--in.  
nut driver.  
Fig. 4 -- Small Chassis Filter Access  
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.  
FILTER  
ACCESS  
PANEL  
LARGE CHASSIS  
A10062  
Fig. 5 -- Large Chassis Filter Access  
Filter Access Panel  
For Accessory Filter Rack  
Replacing or inspecting filters in units with econom-  
Access Panels  
izers  
A09044  
Small Chassis (See Fig. 4)  
Fig. 3 -- Accessory Filter Rack Access Panel  
1. Remove return air duct cover at rear of unit using a 5/16--in.  
nut driver.  
!
2. Remove the filter(s) by pulling it out and through the unit  
duct opening. If filter is dirty, replace both filters with new  
ones.  
WARNING  
FIRE AND UNIT OPERATION HAZARD  
When installing the new filters, note the direction of the airflow  
arrows on the filter frame, which should be pointing at the indoor  
coil.  
Failure to follow this warning could result in personal  
injury, death or property damage.  
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.  
3. Reinstall duct cover ensuring opening is air and water tight.  
Large Chassis (See Fig. 5)  
1. Remove filter access door using a 5/16--in. nut driver.  
2. Remove the filter(s) by pulling it out and through the unit  
filter access door. If filter is dirty, replace both filters with  
new ones.  
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Units with bent indoor coils, install 24 x 18 x 1 (610 x 457 x 25  
mm) filter first and then install 24 x 16 x 1 (610 x 406 x 25) filter.  
When installing the new filters, note the direction of the airflow  
arrows on the filter frame, which should be pointing at the indoor  
coil.  
!
WARNING  
EXPLOSION, BURN AND ENVIRONMENTAL  
HAZARD  
3. Reinstall filter access door ensuring opening is air and  
watertight.  
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.  
Table 2 – Indoor Air Filter Data with Economizer  
50EZ Unit Size  
Filter Size  
2 each 20 x 12 x 1  
30---36  
(508 x 305 x 25 mm)  
1 each 24 x 14 x 1 (610 x 356 x 25 mm),  
24 x 16 x 1 (610 x 406 x 25 mm)  
1 each 24 x 16 x 1 (610 x 406 x 25 mm),  
24 x 18 x 1 (610 x 457 x 25 mm)  
42-48  
Unit Panels  
60*  
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.  
*Units with bent indoor coil.  
50VT Unit Size  
Filter Size  
2 each 20 x 12 x 1  
30  
Regular Dealer Maintenance  
(508 x 305 x 25 mm)  
1 each 24 x 14 x 1 (610 x 356 x 25 mm),  
24 x 16 x 1 (610 x 406 x 25 mm)  
1 each 24 x 16 x 1 (610 x 406 x 25 mm),  
24 x 18 x 1 (610 x 457 x 25 mm)  
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:  
36-42  
48---60*  
*Units with bent indoor coil.  
1. Inspection and, if required, cleaning of the outdoor and  
indoor coils.  
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.  
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 and return air ducts for leaks,  
obstructions, and insulation integrity. Any problems found  
should be resolved at this time.  
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  
5. Inspection of the unit base to ensure that no cracks, gaps,  
etc., exist which may cause a hazardous condition.  
The drain pan and condensate drain line should be checked and  
cleaned at the same time the cooling coils are checked by your  
dealer.  
6. Inspection of the unit casing for signs of deterioration.  
7. Inspection of all electrical wiring and components to assure  
proper connection.  
Compressor  
All compressors are factory shipped with a normal charge of the  
correct type and quantity of refrigeration grade oil. A compressor  
should rarely require additional oil.  
8. Inspection for leaks in the refrigerant circuit. Pressure and  
temperature check to determine appropriate refrigerant  
charge.  
Condenser Fan  
9. Operational check of the unit to determine working  
conditions. Repair or adjustment should be made at this  
time.  
!
WARNING  
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.  
PERSONAL INJURY AND UNIT DAMAGE  
HAZARD  
Failure to follow this warning could result in personal  
injury, death or property damage.  
Warranty Certificate  
Your unit has a limited warranty. Be sure to read the warranty  
carefully to determine the coverage for your unit.  
Do not poke sticks, screwdrivers, or any other object into  
revolving fan blades.  
Before you call for service...  
...check for several easily solved problems.  
If insufficient heating or cooling is suspected:  
The fan must be kept free of all obstructions to ensure proper  
cooling. Contact your dealer for any required service.  
Electrical Controls and Wiring  
(
) Check for sufficient airflow. Check the air filter for dirt. Check  
Electrical controls are difficult to check without proper  
instrumentation. If there are any discrepancies in the operating  
cycle, contact your local dealer and request service.  
for blocked return 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:  
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.  
(
) 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  
SYSTEM switch or MODE control is in the COOL or HEAT and  
not OFF.  
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(
) If your unit still fails to operate, call your servicing dealer for  
In Case of Trouble  
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.  
If you perform the steps above and unit performance is still  
unsatisfactory, shut off the unit and call your dealer.  
C a t a l o g N o : O M 5 0 E Z --- V T --- 0 3  
Copyright 2010 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231  
Printed in U.S.A.  
Edition Date: 04/10  
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.  
R e p l a ce s: OM 5 0 E Z --- VT --- 0 2  
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