Carrier 50SZ Series User manual

50SZ
Single-Package Heat Pump Units
A Guide To Operating and Maintaining Your
Single-Package Heat Pump Unit
HEATING & COOLING
ELECTRICAL SHOCK HAZARD
Failure to Ii}llow this warning could result in personal injury,
death.
Before perlk)mdng recoimnended maintenance, be sure the
main power switch to unit is turned off.
Fig. 1--Unit 50SZ
NOTE TO INSTALLER: This manual shouM be lefl with the
equipment owner.
FOR YOUR SAFETY
Do not slore or use gasoline or other flauunable vapors and liquids
in the vicini{y of this or any odler appliance.
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to lbllow this warning could result in personal injury,
death or properly damage.
Do not use this unit if any part has been tinder water.
hnmediately call a qualified service technician to inspect the
unit and to replace any part of the control system which has
been tinder water.
WELCOME TO EFFiCiENT YEAR-ROUND COMFORT
Congratulations on your excellent choice and sound investment in
year-round home comlk_rt!
Your new heat pump represents both the latest in engineefing
development and the cuhnination of many years of expefience
from one of the most reputable manuIk_cturers of comlk_rt systems.
Your new unit is among the most energy-efficient and reliable heat
pump products available today. To assure its dependability, spend
just a li:w minutes with this booklet now to learn about the
operation of your heat pump, and the small amount of maintenance
it takes to keep it operating at its peak efficiency. With minimal
care, your new heat pump will provide you and your family with
year-round home comlk)rt both now and lk}ryears to come.
SAFETY CONSIDERATIONS
Recognize salEty inlk)rmatiou. This is the sali_ty-alert symbolz_.
When you see this symbol on unit or in instructions and manuals,
be alert to potential lbr personal injury.
Understand the signal words DANGER, WARNING, and CAU-
TION. These words are used with the sali_ty-alert symbol. DAN-
GER identifies the most sefious 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 unsali: 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.
FIRE AND ELECTRICAL SHOCK HAZARD
Improper installation, adjustment, alteration, service, mainte-
nance, or use can cause explosiom fire, electrical shocL or
other conditions which could cause serious injury, death or
properly damage. Consult a qualified installer, service
agency, or your distributor or dealer lk}r inlk_nnation or
assistance. The qualified installer or agency must use factory-
authorized kits or accessories when modilying this product.
YOUR COMFORT SYSTEM
iDENTiFYiNG YOUR SYSTEM
Take the time to familiarize yonrself with your packaged heat
pump type of systenL This knowledge will be of use in under-
standing the basic operation of your new heal primp. The unit has
a rating plate affixed to it which provides necessary inlkmnation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 101 Printed in U.S.A. Catalog No. OM50-43 Pg 1 Replaces: New

Fig. 2--Typical InstaJJation
li)r specific identification of a unit. You should liuniliarize yourself
with the product, model, and serial numbers listed on each rating
plate. Record them li)r li_ture reli_rence in the space provided at the
end of this booklet.
iMPORTANT FACTS
To better protect your investment and to eliminate unnecessary
calls_ familiarize yourself with the lollowing facts:
1. Your heat pump system should never be operated without a
clean air filter properly installed. Plan to inspect the filter
periodically. A clogged air filter will increase operating costs
and shorten the life of the unit.
2. Supply-air and return-air registers should not be blocked.
Drapes, liarlliture, and toys are some of the items commonly
lound obstructing registers. Restricted airflow lessens the
unit's efficiency and lili: span.
3. The outdoor unit nmst have unrestricted airflow. Do not cover
the unit, lean anything against it, or stand on it. Do not allow
grass clippings, leaves, or other debris to accumulate around
on top of the unit. Maintain a 12-in. minimum clearance
between the outdoor unit and tall grass_ vines_ shrubs, etc.
4. Your nmltipurpose indoor thermostat is the control center lk)r
your heat pump system. You should familiarize yourself with
its proper operation. Attempting to control the system by other
means liar instance, switching the electrical supply power
ON and OFF may cause damage to the unit (See Fig. 4).
5. During heating, increasing the thermostat setting more than 2
degrees may cause the supplemental heaters to be turned on
lot a short period of time to satisfy the thermostat. Needless
use of the supplementary heat reduces potential energy sav-
ings.
6. You may find that you can maintain greater personal comli)l't
by running the fan continuously. "Air pockets" can lbrm due
to the structure of the house, placement of registers, etc. air
pockets may be too cool or warm lot your liking. Continuous
lhn operation minimizes any temperature difli:rences. Also,
systems equipped with electronic or mechanical air cleaners
and/or humidifiers ofli?r the added benefits of having the air
continuously cleaned year-round and humidified during the
winter season.
7. A system equipped with a heat or energy recovery ventilator
ofli:rs the advantage of exhausting stale air li"om the home and
allowing fi'esh air in li"om the outdoors while minimizing heat
loss.
8. Your system may also be equipped with a zoning system
which allows individual control over the temperatures of
separate areas of your home.
9. Your heat pump will remove humidity li"omyour holne during
the cooling season. Al_er a li:w minutes of operation, you
should be able to see water trickle l?'om the condensate drain.
Check this occasionally to be sure the drain system is not
clogged. Of course, don't expect to see much drainage if you
live in a very dry environment.
10. During the heating cycle, air from your registers may seem
cooler than you might first expect. This is because your heat
pump delivers a constant flow of air at around 90"F to 105°F
instead of sudden bursts of hot air as with a conventional
lurnace. This air may li:el cooler because it is slightly less than
your skin temperature. However, it is sulTiciently warm to
keep you comli_rtable.
11. Ice or frost will tend to lkmn on the coil during the winter
heating operation. Your heat pump is designed to automati-
cally melt the ice. When in this deli"ost cycle, it is normal 1o17
steam or lk}gto rise l_'om the outdoor unit. Do not be alarmed!
12. Do not operate your unit in cooling mode when outdoor
temperatures are below 55"F unless your unit was modified lot
low-ambient operation.
13. Do not operate your unit in heating mode when outdoor
temperatures are above 66°F unless you set your them_ostat to
emergency heat mode.
FIRE AND ELECTRICAL HAZARD
Failure to lk)llow this warning could result in personal injury,
death and/or property damage.
To prevent serious injury, death, or property damage, read
and li_llow all instructions and warnings, including labels
shipped with or attached to unit beli_re operating your new
heat pump.
OPERATING YOUR HEAT PUMP
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 lk)r heat pump systems have 3 controls: a temperature
control selector, a FAN control, and a SYSTEM or MODE control.
COOLING MODE
When operating in cooling mode, your heat pump will run in
cooling mode until the indoor temperature is lowered to the level
you have selected. On extremely hot days, your heat pump will run
li)r longer periods at a time and have shorter "ofP' periods than on
moderate days.
The li)llowing are typical conditions that add extra heat and/or
hunddity to your home. Your heat pump will work longer to keep
your home comli)rtable under these conditions:
1. Entrance doors are fi'equently opened and closed
2. Laundry appliances are being operated
3. A shower is running
4. More than the usual number of people are present in the home
5. More than the normal number of electric lights am in use
6. Drapes are open on the sunny side of the home
HEATING MODE
With the SYSTEM or MODE control of your indoor thermostat set
to HEAT, your heat pump will run in heating mode until room
temperature is raised to the level you have selected. Of course_
your heat pump will have to operate lk_r longer periods to maintain
a comli_rtable environment on cooler days and nights than on
moderate Ol'Jes.

f-->
Fig. 3--Carrier Non-Programmable Thermostat
SUPPLEMENTAL HEAT
Your heat pump 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 automati-
cally mrn on the supplemental heat in order to maintain the level
of comli_rt you have selected.
When your heat pump needs additional heat to keep you comli_rt-
able, your Carrier electronic themaostat will turn on the supple-
mental heat (if equipped) and will display the "AUX HT" message.
DEFROST MODE
When your heat pump is providing heat to your home and the
outdoor temperature drops below 45"F, moisture may begin to
freeze on the surface of the coil. If allowed to build tap, this ice
would impede airflow across the coil and reduce the amount of
heat absorbed l)'om the outside air. So, to maintain energy-efficient
operation, your heat pump has an automatic defi'ost mode. The
del}'ost mode starts at a preset time interval of 90 ndnutes,
although, it may be reset to either 30 or 50 minutes. Del)'ost will
start at the preset time only if the ice is sufficient to interlere with
normal heating operation. Alter the ice is melted fi'om the coil, or
alter a maxinmm of l0 minutes in del)'ost mode, the unit
automatically switches back to nomml healing operation.
Do not be alarmed if steam or li)g appears at the outdoor unit
during defrost mode. Water vapor l)'om 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 liar ice to build tapon the unit grille. This is normal lk_r
these weather conditions. Do not attempt to remove the ice from
the unit grille. This condition will not allect the proper l)lnction of
the unit and will clear a li_w days.
EMERGENCY HEAT MODE
This allows your supplemental heating source to keep your home
or office warm until your heat pump can be serviced. Also, if the
electricity to your heat pump has been off li._r more than 30
minutes, switch your thermostat to EHEAT mode beli_re restarting
your heat pump. Leave the system in EHEAT mode liar an amount
of time equal to the power outage. It is not necessary to exceed 12
hrs. (If yon cannot determine how long the power has been off,
leave the system in EHEAT mode lor 8 hrs.)
PERFORMING ROUTINE MAINTENANCE
With the proper maintenance and care, your heat pump will
operate economically and dependably. Maintenance can be accom-
plished easily by reli:rring to the lollowing directions. However,
belorc perRmning maintenance, consider these important salL'ty
precautions:
[!
MAIN ""-.
ON
f
A92135
Fig. 4--Main Electrical Disconnect
ELECTRICAL SHOCK HAZARD
Failure to Iollow this warning could result in personal injury
and/or death.
Disconnect all electrical power to the indoor air handler or
limmce belore relnoving access panels to perlk_rm any main-
tenance. Disconnect power to both the indoor and outdoor
units. Note: There may be more than 1 electrical disconnect
switch.
PERSONAL INJURY HAZARD
Failure to lollow this caution may result in personal injury.
Although special care has been taken to minimize sharp edges
in the construction of your uniL to avoid injury be extremely
carelial when handling parts or reaching into the unit.
CHECK THE AiR FILTER
Adirty air filter will cause excessive strain on the compressor and
blower motor. This can cause the components to overheat and
automatically shut down. In the worst case, the components will
fail and need to be replaced. To avoid inell'icient or failed
operation of your unit, CHECK THE FILTER(S) EVERY 3
MONTHS. Replace lilter(s) when necessary, or clean the filter(s)
if you have the reusable type.
Disposable filters should be replaced by similar, new filters of the
same dimensions.
Reusable, permanent filters should be washed in a solution of cold
water and mild detergent, then rinsed and thoroughly dried. THE
FILTER MUST BE COMPLETELY DRY BEFORE BEING
REINSTALLED. To avoid prolonged shutdown of your unit while
a filter is drying, you should have an extra filter on hand. This
allows you to rotate between the two with minimal downtime liar
your comlk_rt system. Extra filters may be purchased l)'om your
dealer.
Table 1--Filter Size Data
UNIT SIZE i FILTER SIZE
50SZ024-030 1 20x24
50SZ036-060 24x36
The filters(s) and filter rack l_r a packaged system are supplied
and installed by the contractor or dealer. Typically, the filter(s) and
rack are located in the return-air duct at the outdoor unit or behind

thereturn-airgrille(s).Haveyourdealershowyouthelocationof
yourfilter(s)andtheprocedureslk_rremovalandreplacement.
Ifyoursysteminclndesahighefficiencyorelectronicaircleaner,
relertoaircleanerUser'sManuallk)rproperliltercleaningor
replacement.
OUTDOOR COiL
If grass clippings, leaves, shrubbery, and debris are kept away
l)'om the unit, minimal care should be sul_cient to keep the system
lunctioning properly. However, if the outdoor coil becomes dirty,
use a vacuum cleaner or shop vac with sol) brush attaclnnent to
clean the exterior surface. Vacumn coil surlhce using an up and
down motion. Be careful not to bend or damage lins.
If din is deep in the coil, contact your dealer lot service. Do not
attempt this yoursell'.
OUTDOOR COIL--SEA COAST
If your unit is located near the ocean, special maintenance is
required. Ocean mist/breeze carries salt, which is corrosive to most
metals. Although your new unit is made out of galvanized metal
and is protected by top-grade paint, you should take the precaution
of additional maintenance which consists of periodically washing
the unit. By washing all exposed surfaces and coil, you will be
adding additional lili_ to your unit. Please consult your installing
contractor lot proper intervals/procedures liar your geographic area
or service contact.
UNIT SUPPORT
Your packaged heat pump unit should be maintained at a level
position. If its support should shili or settle so that the unit is no
longer level, you should correct the condition. Relevel it prolnptly
to assure water drains out of the unit. If you notice that water or ice
collects beneath the unit, arrange lk)rit to be drained away fi'om the
unit.
BEFORE YOUR REQUEST A "SERVICE CALL"
CHECK FOR THESE EASILY SOLVED PROBLEMS:
1. Check the indoor and outdoor disconnect switches. Verify that
circuit breakers are ON or that lilses have not blown.
2. Check lot sufficient airflow. Check the air filter(s) lot any
accumulations of dirt. Check lk)r blocked return-air or supply-
air registers. Be sure registers are open and unobstructed.
3. Check the settings on your indoor thermostat. If you desire
cooling, make sure that the temperature control selector is set
below room temperature and the SYSTEM or MODE control
is set to COOL or AUTO. If you require warmth, make sure
that the temperature control selector is set above room
temperature and the SYSTEM or MODE control is set to
HEAT or AUTO. The FAN control should be set to ON lk)r
continuous blower operation or AUTO if you wish blower to
flmction only while your heat pump is operating. If your
comlk)rt system still fails to operate, turn your system o11"and
contact your servicing dealer lbr troubleshooting and repairs.
Specify your apparent problem, and state the model and serial
number of your equipment. (You should have them recorded
on the last page of this booklet.) With this inlkmnation, your
dealer may be able to ol'li:r helplM suggestions over the phone
or save valuable time through knowledgeable preparation li}r
the service call.
REGULAR DEALER MAINTENANCE
In addition to the routine maintenance that you perlkmn, your
home comlk)rt system should be inspected regularly by a properly
trained service technician. The inspection (pmllsrably twice each
year, but at least once every year) should include the liHlowing:
1. Routine inspection of air filter(s). Replacement or cleaning as
required.
2. Inspection and cleaning of the blower wheel, housing, and
motor as required.
3. Inspection and, if required, cleaning of coils.
4. A check of all electrical wiring and connections.
5. A check lbr secure physical connections of individual con>
ponents within unit.
6. Operational check of the heat pump system to determine
actual working condition. Necessary repair andk_r adjustment
should be performed at this time.
7. Your servicing dealer may ol'li:r an economical service con-
tract that covers seasonal inspections. Ask liar lurther details.
WARRANTIES
You have purchased a 5(tSZ series unit. Be sure to read the
warranty at the back of this booklet carefully to determine the
coverage for your unit.
FOR THE RECORD
Record the model, product, and sefial numbers of your new
equipment in the spaces provided. This inlormation, along with the
other ready-relerence facts requested will be necessary should you
ever require inli)rmation or service.
iNSTALLATiON DATA
Date Installed ..................................................................................
Dealer's Name .................................................................................
Address ............................................................................................
State/Zip ..........................................................................................
Telephone ........................................................................................
UNiT DATA
Unit M[odel ......................................................................................
Unit Serial Number ........................................................................
Heater, if applicaMe:
Part Number ...................................................................................
Kilowatt Rating ..............................................................................
Copyright 2005 CARRIER Corp. *7310 W. Morris St. •Indianapolis, IN 46231
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Be°k 1L_L__ PC 101 Printed in USA Catalog No OM50-43 Pg 4 Replaces: New
Tab 16 18