Carrier INFINITY 50XT-A Instruction Manual

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50XT---A
Infinityr15 SEER
Single Packaged Heat Pump System
with PuronR(R ---410A) Refrigerant
Owner’s Information Manual
A09032
Fig. 1 -- Unit 50XT--A
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.

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SAFETY CONSIDERATIONS
Improper installation adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory--authorized kits or accessories
when modifying this product Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes,
the current editions of the National Electrical Code (NEC) NFPA
70.
In Canada refer to the current editions of the Canadian electrical
Code CSA C22.1.
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 CAUTION.
These words are used with the safety--alert symbol. DANGER
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 unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to high-
light suggestions which will result in enhanced installation, reli-
ability, or operation.
Note: Installer: This manual should be left with the equipment user.
FORYOURSAFETY
Failure to follow this caution may result in personal injury.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
CAUTION
!
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 qualified service technician to inspect the
unit and to replace any part of the control system which has
been under water.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before performing recommended maintenance, be sure the
main power switch to unit is turned off.
!WARNING
OPERATING YOUR UNIT
The operation of your heat pump system is controlled by the
InfinityrUser Interface (UI). You may adjust the temperature
manually through the UI or program the UI for automatic control.
See UI manual for detailed instructions.
To better protect your investment and to eliminate unnecessary ser-
vice calls, familiarize yourself with the following facts:
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!
To start the unit:
1. Turn on the electrical power supply to unit.
2. Set MODE control to desired mode and the User Interface
for automatic control.
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
With the UI control set to COOL, your unitwill run in cooling mode
until the indoor temperature is lowered to the level you have se-
lected. On extremely hot days, your unit will run for longer periods
at a time and have shorter “off” periods than on moderate days.
Heating Mode
With the UI 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 com-
fortable environment on cooler days and nights than on moderate
ones.
Supplemental Heat
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 com-
fort you have selected.
Defrost Mode
When your unit is providing heat to your homeor office and theout-
door 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 amount of heat ab-
sorbed from the outside air. So, to maintain energy--efficient opera-
tion, your unit has an automatic defrost mode.
The defrost mode starts at a preset time interval of 30 minutes, al-
though, it may be reset to 60, 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 min-
utes in defrost mode, the unit automatically switches back to normal
heating operation.
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.
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

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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.
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 of-
fice warm until your unit can be serviced. Contact your dealer in the
event of primary unit heat failure.
Emergency Cooling Mode
In the event of UI failure, the emergency cooling mode allows your
unit to keep your home or office cool until your UI can be serviced.
Contact your dealer for more information.
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.
FORYOURSAFETY
Failure to follow this caution may result in personal injury.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
CAUTION
!
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 [1067 mm] in.
clearance) and the duct side (12 in. [305 mm] minimum clearance).
Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to maintain
yourself, 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.
!WARNING
Air Filters
The air filter(s) should be checked at least every 3 months 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 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
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.
Table 1 indicates the correct filter size for your unit.
Table 1—Air Filters Located Inside Unit
(For Replacement Purposes)
Unit Size Quantity Filter Size
24---30 212x20x1
(305x508x25)
36---60 312x24x1
(305x610x25)
To replace or inspect filters in accessory filter rack:
1. Remove the filter access panel (See Fig. 2) 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 ar-
rows on the filter frame.
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.
Access Panels
Filter Access Panel
For Accessory Filter Rack
A09045
Fig. 2 -- Accessory Filter Rack Access Panel
FIRE AND UNIT OPERATION HAZARD
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.
!WARNING
Fans and Fan Motor
Periodically check the condition of fan wheels and housings and
fan--motor shaftbearings.Contactyour dealerforthe required annu-
al maintenance.
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.

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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 arefactory shipped with anormal chargeof thecor-
rect type of refrigeration grade oil. A compressor should rarely re-
quire 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 poke sticks, screwdrivers, or any other object into
revolving fan blades.
!WARNING
The fan must be kept free of all obstructions to ensure proper cool-
ing. Contact your dealer for any required service.
Electrical Controls and Wiring
Electrical controlsare difficult to check without properinstrumenta-
tion. If there are any discrepancies in the operating cycle, contact
your local dealer and request service.
Refrigerant Circuit
The refrigerantcircuitisdifficultto check forleakswithout theprop-
er equipment. If inadequate cooling is suspected, contact your local
dealer for service.
EXPLOSION, BURN AND ENVIRONMENTAL
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.
!WARNING
Unit Panels
After performing any maintenance or service on the unit, be sureall
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 outdoor and
indoor coils.
2. Inspection and, if required, cleaning of the indoor coil drain
pan.
3. Inspection and cleaning ofblower wheelhousing andmotor.
4. Inspection of all supply and return air ducts for leaks,
obstructions, and insulation integrity. Any problems found
should be resolved at this time.
5. Inspectionof theunit base to ensurethat 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 assure
proper connection.
8. Inspection for leaks in the refrigerant circuit. Pressure check
to determine appropriate refrigerant charge.
9. Inspection of compressor oil level by service person to
ensure proper oil level is maintained in the compressor when
it is installed and running.
10. Operational check of the unit to determine working
conditions. Repairor adjustmentshould be madeat thistime.
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.
Warranty Certificate
Your unit has a limited warranty. Be sure to read the warranty care-
fully 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
forblocked return or supply air grilles. Be sure they are open and un-
obstructed. If these checks do not reveal the cause, call your servic-
ing dealer.
If your unit is not operating at all, check the following list for
easy solutions:
( ) Check to be sure that thetemperature specified by your UI isset
below the indoor temperature during the cooling season or above
the indoor temperature during heating season. Be sure the UI is set
to COOL or HEAT and not OFF.
( ) 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 of-
fer 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.
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 2009 Carrier Corporation Edition Date: 03/09 Catalog No: OM50XT---01
Re
p
laces: OM50--- 53
Manufacturer reserves the right to change, at any time, specifications and design without notice and without obligation.