48XT---A
Infinityr 15 SEER
Single Packaged HYBRID HEATr Dual Fuel System
with PuronR (R---410A) Refrigerant
Owner’s Information Manual
Fig. 1 -- Unit 48XT--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
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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3. Turn off the electrical supply to the unit.
WARNING
!
4. Remove the front access panel with a 5/16--in. nut driver.
FIRE AND EXPLOSION HAZARD
5. Move the selector switch onthe internalgas valveto theOFF
position and wait 5 minutes.
Failure to follow this warning could result in personal injury,
death, and/or property damage.
6. Move the selector switch on the internal gas valve to the ON
position.
1. If the main burners fail to light, or the blower fails to start,
shut down gas heating section and call your dealer for service.
2. Never attempt to manually light the main burners on unit
with a match, lighter, or any other flame. If the electric
sparking device fails to light the main burners, refer to the
following shutdown procedures, then call your dealer as soon
as possible.
7. Replace the front access panel.
8. Turn on the electrical supply to unit.
9. Open the external manual gas shutoff valve.
10. Set the temperature selector on UI slightly above room tem-
perature to start unit. The induced--draft combustion air fan
will start. Main gas valve will open and main burners should
ignite within 5 seconds. If the burner does not light within 5
seconds, the ignition module will go into a Retry Mode after
a period of approximately 22 seconds (following the
5--second ignition period). If the burners do not light within
15 minutes of the initial call for heat, there is a lockout.
To Shut--off Unit Gas Heat:
WARNING
!
FIRE,
EXPLOSION,
ELECTRICAL
SHOCK
HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
11. Set the temperature selector on UI to desired setting.
Do not turn off the electrical power to unit without first
turning off the gas supply.
Note:If the unit is being shut down because of a malfunction, call
your dealer as soon as possible.
Should overheating occur or the gas supply fail to shut off, shut off
the external manualgasvalveto theunitbeforeshutting off theelec-
trical supply. 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 and any gas control
which has been under water.
Refer to Fig. 5 while proceeding with the following steps.
1. Set the temperature selector on UI to lowest temperature set-
ting and set system SWITCH to OFF.
2. Close the external manual shutoff valve.
3. Turn off the electrical power supply to the unit.
4. Remove the front access panel.
Filter Access Panel
For Accessory Filter Rack
5. Movetheselectorswitchontheinternalgas valveto theOFF
position.
Access Panels
6. Replace the front access panel.
A09045
Fig. 2 -- Accessory Filter Rack Access Panel
To Start Unit Electric Cooling:
Refer to Fig. 6 while proceeding with the following steps.
1. Set the temperatureselector onUI tohighest temperatureset-
ting and set system SWITCH to OFF.
2. Close the external manual shutoff valve.
3. Turn off the electrical power supply to the unit.
4. Remove the front access panel.
5. Move the selector switch onthe internalgas valveto theOFF
position.
6. Replace the front access panel
7. Restore electrical power to the unit and set system switch to
COOL.
8. Set the temperature selector on UI slightly below the room
temperature to start unit.
Flue Hood
Burners
Gas Valve
To Shut Off Unit Electric Cooling:
A09043
Refer to Fig. 7 while proceeding with the following steps.
1. Set the temperatureselector onUI tohighest temperatureset-
ting and set system SWITCH to OFF.
Fig. 3 - Gas Heating/Electric Cooling Unit with
Access Panel Removed (Standard unit shown. Actual
appearance is shown in Fig. 2.)
2. Close the external manual shutoff valve.
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3. Turn off the electrical power supply to the unit.
!
WARNING
Note: Heat Pump heating mode procedure is similar to electric
cooling mode except thermostat mode is HEAT and UI must
operate on first stage heating above the balance point that has
been determined by the Dealer.
FIRE,EXPLOSION,ELECTRICAL SHOCKHAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
OPERATING YOUR UNIT
BEFORE SERVICING OR PERFORMING MAINTE-
NANCE ON YOUR UNIT:
The operation of your unit is controlled by the Infinityr UI. You
simplyprogramtheUIandit maintainsthe indoortemperature atthe
level you select. See UI manual for detailed instructions.
1. TURN OFF GAS SUPPLY TO YOUR UNIT.
2. TURN OFF ELECTRICAL POWER TO YOUR UNIT.
To better protect your investment and to eliminate unnecessary ser-
vice calls, familiarize yourself with the following facts:
!
CAUTION
Step 1—Cooling Mode
CUT HAZARD
Failure to follow this caution may result in personal injury.
With the SYSTEM control set to COOL, your unit will run in cool-
ing 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.
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.
Step 2—Hybrid Heating Mode
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.
Your HYBRID HEAT system combines the strengths of two heat-
ing sources; an electric heat pump and a gas furnace. A HYBRID
HEAT system provides more control over your monthly energy
bills by allowing you to choose the most economical method of
heating. As conditions change, the system automatically switches
between the two sources to maintain greater efficiency than with a
single--source heating system.
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 ap-
plications, 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 re-
placed.
With the UI control set to HEAT, your unit will normally operatethe
electric heat pump until the room temperature is raised to the level
you have selected. If the demand for heat cannot be met by the elec-
tric heatpump, yourUI controlwill automaticallyswitch togas heat
until the call for heat is satisfied.
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. Refer to Fig. 2
to access filters installed in the accessory filter rack.
On colder days, your system may automatically switch to gas heat
as the primary heating source to maximize the overall system effi-
ciency and maintain your comfort level.
Table 1—Air Filters Located Inside Unit
(For Replacement Purposes)
Unit Size
Quantity
Filter Size in. (mm)
When your heat pump needs additional heat to keep you comfort-
able, your thermostat will turn on the supplemental gas heat.
12x20x1
(305X610x25)
A24---A30
2
12x24x1
(305x610x25)
A36---A60
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MAINTENANCE AND SERVICE
To replace or inspect filters in accessory filter rack (See Fig. 2):
1. Remove the filter access panel using a 5/16--in. nut driver.
This section discusses maintenance that should be performed on
your system. Most maintenance should be performed by your deal-
er. You, as the owner, may wish to handle some minor maintenance
for your new unit.
2. Removethefilter(s)by pulling itoutoftheunit.If thefilter(s)
is dirty, clean or replace with a new one.
When installing the new filter(s), note thedirection ofthe airflow ar-
rows on the filter frame.
Routine Maintenance
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.
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).
!
WARNING
FIRE AND UNIT OPERATIONAL HAZARD
Failure to follow this warning could result in death, personal
injury and/or property damage.
Maintenance and Care for the Equipment Owner
Never operate your unit without filters in place. An
accumulation of dust and lint on internal parts ofyour unitcan
cause loss of efficiency.
Before proceeding with those things you might want to maintain
yourself, please carefully consider the following:
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Fans and Fan Motors
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:
Periodically check the condition of fan wheels and housings andfan
motor shaft bearings. Contact your dealer for the required annual
maintenance.
Indoor and Outdoor Coils
1. Inspection and, if required, cleaning of the outdoor and
indoor coils.
Cleaning of the coils should only be done by qualified service per-
sonnel. Contact your dealer for the required annual maintenance.
2. Inspection and, if required, cleaning of the indoor coil drain
pan.
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.
3. Inspection and cleaning of blower wheelhousing andmotor.
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.
Compressor
All compressors arefactory shippedwith anormal chargeof thecor-
rect type of refrigeration grade oil. A compressor should rarely re-
quire additional oil.
5. Inspectionof theunit baseto ensurethat nocracks, gaps,etc.,
exist which may cause a hazardous condition.
6. Inspection of the unit casing for signs of deterioration.
Condenser Fan
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.
WARNING
PERSONAL INJURY AND UNIT DAMAGE HAZARD
9. Operational check of the unit to determine working
conditions.Repairoradjustmentshouldbe madeat thistime.
Failure to follow this warning could result in death, personal
injury and/or property damage.
Your servicing dealer may offer an economical service contract that
covers seasonal inspections. Ask for further details.
Do not insert sticks, screwdrivers, or any other objects into
revolving fan blades.
Complete service instructions can be found in the unit Installation,
Start--up and Service Instructions.
The fan must be kept free of all obstructions to ensure proper cool-
ing. Contact your dealer for any required service.
Warranty Certificate
Your unit has a limited warranty. Be sure to read the warranty care-
fully to determine the coverage for your unit.
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.
Before you call for service...
...check for several easily--solved problems.
If insufficient heating or cooling is suspected:
Refrigerant Circuit
Therefrigerantcircuitisdifficulttocheckforleakswithout theprop-
er equipment. If inadequate cooling is suspected, contact your local
dealer for service.
( ) 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:
!
WARNING
EXPLOSION, BURN AND ENVIRONMENTAL
HAZARD
(
) Check to be sure that the temperature specified by your User
Interface is set below the indoor temperature during the cooling sea-
son or above the indoor temperature during heating season. Be sure
the User Interface is set to COOL or HEAT and not OFF.
Failure to follow this warning could result in death, personal
injury and/or property damage.
(
) If your unit still fails to operate, call your servicing dealer for
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.
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.
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.
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.
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MAIN
ON
55
OFF
STEP 1
STEP 2
STEP 3
STEP 5
STEP 4
STEP 6
STEP 7
MAIN
ON
72
OFF
STEP 8
STEP 9
STEP 10
A09133
Fig. 4 - To Start Unit Gas Heat
6
MAIN
ON
55
OFF
STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
STEP 6
A09134
Fig. 5 - To Shut-off Unit Gas Heat
7
MAIN
ON
90
OFF
STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
MAIN
ON
OFF
STEP 6
STEP 7
72
STEP 8
A09135
Fig. 6 - To Start Unit Electric Cooling
8
MAIN
ON
90
OFF
STEP 1
STEP 2
STEP 3
A07797
Fig. 7 - To Shut-off Unit Electric Cooling
9
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: OM48XT---01
Manufacturer reserves the right to change, at any time, specifications and design without notice and without obligation.
R e p l a ce s: OM 4 8 --- 2 6
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