Carrier 48EZ Series Instruction Manual

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Owner's Information Manual
Fig. 1 - Unit 48EZ
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,

SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be hazardous due to
mechanical and electrical components. Only trained and qualified
personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on this
equipment, observe precautions in the literature, on tags, and on la-
bels attached to or shipped with the unit and other safety precautions
that may apply.
Follow all safety codes. Installation must be in compliance with lo-
cal and national building codes. Wear safety glasses, protective
clothing, and work gloves. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit.
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 CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER 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 un-
safe practices which may result in minor personal injury or product
and property damage. NOTE is used to highlight suggestions which
will result in enhanced installation, reliability, or operation.
Note: Installer: This manual should be left with the equipment user.
FOR YOUR SAFETY
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.
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.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
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.
UNIT INTRODUCTION
This 48EZ unit is a small packaged gas heat/electric heat pump sys-
tem that can utilize both the efficiency of heat pump heating and the
comfort of gas heating. The system will optimize for ideal heating,
depending on several factors. This unit uses Puron'_Z_, the ozone
friendly refrigerant, for cooling and heat pump heating.
Starting or Shutting Off Unit
To start the unit:
1. Turn on the electrical power supply and gas to unit.
2. Select desired temperature on thermostrat and set SYSTEM
switch or MODE control to desired mode.
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 SWITCH or MODE control to OFF.
2. Turn offthe electrical power, install lock-out tag and shut off
gas supply to unit.
OPERATING YOUR UNIT
The operation of your unit is controlled by the indoor temperature
control (for 48EZ, either a Thermidistat " or Hybrid Heat thermo-
stat is required). You simply adjust the thermostat and it maintains
the indoor temperature at the level you select. Most thermostats of
heating and cooling 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.
To better protect your investment and to eliminate unnecessary ser-
vice calls, familiarize yourself with the following facts:
1. During heat pump heating, increasing the thermostat setting
more than 2°F may cause the supplemental gas heat to be
turned on for a short period of time to satisfy the thermostat.
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 heat pump 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. Do not be alarmed[
Step 1--Cooling Mode
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.
Step 2--Heat Pump Heating Mode
With the SYSTEM or MODE control of your idoor thermostat set
to HEAT, your unit will run in heat pump heating mode until room
temperature is raised to the level you have selected. Of couse, your
system will run for longer periods to maintain a comfortable envi-
ronment on cooler days and nights than on moderate ones.
Step 3--Gas Heat Mode
Your heat pump is your primary heating source. Your system is also
equipped with a supplemental gas heating source. On cold days and
nights, your system will automatically turn on the suppmental heat
in order to maintain the level of comfort you have selected.
When your heat pump needs additional heat to keep you comfort-
able, your Carrier electronic thermostat will turn on the supplemen-
tal gas heat and display the "AUX HT" message.
Step 4_Defrost Mode
When your heat pump 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 amount of
heat absorbed from the outside air. So. to maintain energy-efficient
operation, your heat pump has an automatic defrost mode.

Thedefrostmodestartsatapresettimeintervalof30minutes,al-
though,itmayberesetto60.90or120minutes.Defrostwillstart
atthepresettimeonlyiftheiceissufficienttointerferewithnormal
heatingoperation.
Aftertheiceismeltedfromthecoil,orafteramaximumof10min-
utesindefrostmode.theunitautomaticallyswitchesbacktonormal
heatingoperation.
Donotbealarmedifsteamorfogappearsattheoutdoorunitduring
defrostmode.Watervaporfromthemeltingicemaycondenseinto
amistinthecoldoutsideair.
Duringcertainweatherconditionssuchasheavysnowandfreezing
rainitisnotuncommonfnricetobuildupontheunitgrille.Thisis
normalfortheseweatherconditions.Donotattempttoremovethe
icefromtheunitgrille.Thisconditionwillnotaffecttheproper
functionoftheunitandwillclearwithinafewdays.
Step 5--Emergency Heat Mode
If you should have problems with the heat pump portion of your sys-
tem, this mode allows your supplemental gas heating source to keep
your home or office warm until your heat pump can be serviced.
MAINTENANCE AND SERVICE
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.
Routine Maintenance
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard procedure.
For your safety, keep the unit area clear and free of combustible ma-
terials, gasoline, and other flammable liquids and vapors.
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) (305 mm).
Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to maintain
voursel£ please carefully consider the following:
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to fnllow 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.
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.
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.
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 indoor filter size for your unit. Refer
to Fig. 2 to access filters installed in the accessory filter rack. If using
an Accessory Filter Rack, refer to the Installation Instructions pro-
vided with it for correct filter sizes and quantities.
Table I--Indoor Air Filter Data
Unit Size Filter Size
48EZ024-030 20x24xl (508x610x25mm)
48EZ036 24x30xl (610x762x25mm)
48EZ642-060 24x36xl (610x914x25mm)
FtLTERACCESS
PANE_
*For accessory filter rack.
ACCESS PANEL
Fig. 2 - Accessory Filter Rack Access Panel
(Optional Louvered Panels Shown)
C99094
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.
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 difficult?, 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.
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.
Fans and Fan Motors
Periodically check the condition of fan wheels and housings and fan
motor shaft bearings. Contact your dealer for the required annual
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.

CondensateDrain
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 are factory shipped with a normal charge of the cor-
rect type of refrigeration grade oil. A compressor should rarely re-
quire additional oil.
Condenser (Outdoor) Fan
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
Do not insert sticks, screwdrivers, or any other objects into
revolving fan blades.
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 controls are difficult to check without proper instrumenta-
tion. If there are any discrepancies in the operating cycle, contact
your local dealer and request service.
Refriuerant Circuit
The refrigerant circuit is difficult to check for leaks without the prop-
er equipment. If inadequate cooling is suspected, contact your local
dealer for service.
EXPLOSION AND BURN 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.
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.
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 of blower wheel housing and motor.
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.
5. Inspection of the unit base to ensure that 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. Operational check of the unit to determine working
conditions. Repair or adjustment should be made at this time.
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.
Befalls 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
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:
( ) 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.
( ) 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.
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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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 2007 Carrier Corporation Printed in the US.A. Edition Date: 03/07
Manufacturer reserves the right to change, at any tirne_ specifications and design without notice and without obligation. Catalol_ No: 0M48-28
Replaces: NEW