Carrier 50ZH Series User manual

turn to the expe_
Owner's Manual
Fig. 1 - 50ZH Single-Packaged Heat Pump
C00001
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
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 C22A.
Recognize safety information. This is the safety-alert symbol Z_
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 highlight suggestions which
will result in enhanced installation, reliability, or operation.
NOTE: Installer: This manual should be left with the equipment
user.
FIRE, EXPLOSION, ELECTRICAL SHOCK
HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
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.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Do not store or use combustible materials, gasoline, or other
flammable vapors and liquids in the vicinity of this or any
other appliance.
ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal
injury and/or death.
Before performing recommended maintenance, be sure the
main power switch to unit is turned off and lock-out tag is
installed.
)arts or reachin_ into the unit.
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.
WELCOME TO EFFICIENT YEAR-
ROUND COMFORT
Congratulations on your excellent choice and sound investment in
home comfort!
Your new heat pump represents both the latest in engineering
development and the culmination of many years of experience
from one of the most reputable manufacturers of comfort systems.
Your new unit is among the most reliable home comfort products
available today. To assure its dependability, spend just a few
minutes with this booklet now. 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 heat pump will provide you and your
family with satisfying home comfort -- both now and for years to
come.
IMPORTANT FACTS
To better protect your investment and to eliminate unnecessary
service calls, familiarize yourself with the following facts:
• 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.
• Supply-air and return-air registers should not be blocked.
Drapes, furniture, and toys are some of the items commonly
found obstructing grilles. Restricted airflow lessens the unit's
efficiency and life span.
• Outdoor units must have unrestricted airflow. Do not cover the
unit, lean anything against it, or stand upon it. Do not allow
grass clippings, leaves, or other debris to accumulate around or
on top of the unit. Maintain a 12-in. (305 mm) minimum
clearance between the outdoor unit and tall grass, vines, shrubs,
etcetera.
• Your multipurpose indoor thermostat is the control center for
your heat pump system. You should familiarize yourself with its
proper operation. Attempting to control the system by other
means -- for instance, switching the electrical supply power ON
and OFF -- may cause damage to the unit.

• Thermostat"jiggling"causesrapid-cycling,whichispotentially
damagingtothecompressor.Donotmovethetemperature
selectoronthethermostatforanyreasonforatleast5minutes
after the compressor has shut off.
• You may find that you can maintain greater personal comfort by
running the fan continuously. "Air pockets" can form due to the
structure of the building, placement of registers, etcetera. These
air pockets may be too cool or warm for your liking. Continuous
fan operation minimizes any temperature differences. Also,
systems equipped with electronic air cleaners and/or humidifiers
offer the added benefits of having the air continuously cleaned
year-round, and humidified during the winter season.
• Your heat pump will remove humidity from your home during
the cooling season. After a few minutes of operation, you should
be able to see water trickle from 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 climate.
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 for heat pump systems include temperature control
selector, FAN switch, and SYSTEM switch.
The temperature control selector is a dial or button(s) that allows
you to establish the degree of temperature that you wish to
maintain for your personal comfort. Some thermostats possess two
temperature control selectors: one for setting the temperature
desired during the cooling cycle, and one to set the heating
operation temperature. Typical settings are 78°F (25.6°C) for
cooling and 68°F (20°C) for heating.
The FAN switch offers two options for controlling the blower:
AUTO and ON. When set to AUTO, the blower will run during the
time the heat pump is operating. When the FAN switch is set at the
ON position, the blower will run continuously.
Typically, the SYSTEM switch on your thermostat offers the
following selections: COOL, OFF, and HEAT. Your thermostat
may also have another selection, AUTO. The heat pump will not
operate when the SYSTEM switch is set at the OFF position. With
the SYSTEM switch set at COOL, your heat pump will operate in
its cooling mode when the indoor temperature rises above the level
that you wish to maintain. With the SYSTEM switch set at the
HEAT position, your heat pump will provide warmth whenever the
indoor temperature falls below the level that you have selected.
The AUTO selection found on some thermostats provides for
automatic changeover between cooling and heating cycles. With
the SYSTEM switch set in the AUTO position, the cooling mode
is activated when the indoor temperature rises above the thermostat
cooling temperature setting, or the heating mode will be activated
when the indoor temperature drops below the thermostat setting for
the heating cycle.
See your thermostat owner's manual for additional information.
Cooling Cycle
When operating in the cooling cycle, your heat pump will run until
the indoor temperature is lowered to the level you have selected.
On extremely hot days, your heat pump will run for longer periods
at a time and have shorter "off _' periods than on moderate days.
The following are typical conditions that add extra heat and/or
humidity to your home. Your heat pump will work longer to keep
your home comfortable under these conditions:
• Entrance doors are frequently opened and closed
•Laundry appliances are being operated
• A shower is running
• More than the usual number of people are present in the home
• More than the normal number of electric lights are in use
• Drapes are open on the sunny side of the home
Heating Cycle
With the SYSTEM switch of your indoor thermostat set to the
HEAT position, the heat pump will operate in its heating mode
until room temperature is raised to the level you have selected. Of
course, the heating unit will have to operate for longer periods to
maintain a comfortable environment on colder days and nights
than on moderate ones.
• Do not operate your unit in the heating mode when outdoor
temperatures are above 66°F 19°C).
Defrost Cycle
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 outdoor 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 cycle.
The defrost cycle starts at ta preset time interval of 60 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 outdoor coil, or after a maximum
of 10 minutes in the Defrost mode, the unit will automatically
switch back to normal heating operation.
Do not be alarmed if steam or fog appears at the outdoor unit
during the defrost cycle. Water vapor from the melting ice may
condense into a mist in the cold outside air.
f
A94134

PERFORMING ROUTINE MAINTENANCE Check the Air Filter
FIRE, EXPLOSION, ELECTRICAL SHOCK AND
CUT HAZARD
Failure to follow this warning could result in personal
iniury, death or property damage.
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT
BEFORE SERVICING OR PERFORMING
MAINTENANCE.
2. When removing top 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. Wear safety glasses, glove, and appropriate pro-
tective clothing. Side access panel should not be
removed.
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.
With the proper maintenance and care, your heat pump will operate
economically and dependably. Maintenance can be accomplished
easily by referring to the following directions. However, before
performing maintenance, consider these important safety
precautions:
• DISCONNECT ALL ELECTRICAL POWER TO THE HEAT
PUMP BEFORE REMOVING TOP ACCESS PANEL TO
PERFORM SERVICE OR MAINTENANCE.
NOTE: THERE MAY BE MORE THAN ONE ELECTRICAL
DISCONNECT SWITCH.
•ALTHOUGH SPECIAL CARE HAS BEEN TAKEN TO
MINIMIZE SHARP EDGES IN THE CONSTRUCTION OF
YOUR UNIT, BE EXTREMELY CAREFUL WHEN
HANDLING PARTS OR REACHING INTO THE UNIT.
MAIN
C07331
UNIT OPERATION HAZARD
Failure to follow this caution may result in 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 and blower motor and/or
compressor damage,
A dirty 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 extreme, the components will fail
and need to be replaced. To avoid inefficient or failed operation of
your unit, CHECK THE FILTER(S) EVERY 3 TO 4 WEEKS.
Replace filter(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
would allow you to rotate between the two with minimal downtime
for your comfort system. Extra filters may be purchased from your
dealer.
The filter(s) and filter rack for 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 the
return-air grille(s). Have your dealer show you the location of your
filter(s) and the procedures for removal and replacement.
If you have any questions about the removal and/or cleaning of
your filter(s), contact your dealer for assistance.
If grass clippings, leaves, shrubbery, and debris are kept away from
the unit, minimal care should be sufficient to keep the system
functioning properly. However, if the outdoor coil becomes dirty,
use a brush or vacuum cleaner and soft brush attachment to clean
the exterior surface. If dirt is trapped deep in the coil, contact your
dealer for service.
Unit Support
Your packaged unit should be maintained at a level position. If its
support should shift or settle so that the unit is no longer level, you
should correct the condition. Relevel it promptly to assure
condensate drainage out of the unit. If you notice that water or ice
collects beneath the unit, arrange for it to be drained away from the
unit.
BEFORE YOU CALL FOR SERVICE
CHECK FOR THESE EASILY SOLVED
PROBLEMS
Check the indoor and outdoor disconnect switches. Verify that
circuit breakers are ON or that fuses have not blown.
Check for sufficient airflow. Check the air filter(s) for any
accumulations of dirt. Check for blocked return-air or supply air
grilles. Be sure grilles are open and unobstructed.
Check the settings on your indoor thermostat. If you desire
cooling, see that the temperature control selector is set below room
temperature and the SYSTEM switch is on the COOL or AUTO
position. If you require warmth, be sure the temperature control
selector is set above room temperature and the SYSTEM switch is
at HEAT or AUTO. The FAN switch should be set at ON for
continuous blower operation or AUTO if you wish the blower to
function only while the unit is operating.

If your comfort system still fails to operate, contact your servicing
dealer for troubleshooting and repairs. Specify your apparent
problem, and state the model and serial numbers of your
equipment. (You should have them recorded on page I of this
booklet.) With this information, your dealer may be able to offer
helpful suggestions over the phone, or save valuable time through
knowledgeable preparation for the service call.
REGULAR DEALER MAINTENANCE
In addition to the routine maintenance that you perform, your
home comfort system should be inspected regularly by a properly
trained service technician. The inspection (preferably each year, but
at least every other year) should include the following:
• Routine inspection of air filter(s). Replacement or cleaning as
required.
• Inspection and cleaning of the blower wheel, housing, and
motor. Service should include proper lubrication of these
components.
• Inspection and, if required, cleaning of indoor (evaporator) and
outdoor (condenser) coils.
• Inspection of the indoor coil drain pan, plus the drain line.
Service should include cleaning if required.
• A check of all electrical wiring and connections.
• A check for secure physical connections of individual
components within units.
• Operational check of the system to determine actual working
condition. Necessary repair and/or adjustment should be
performed at this time.
FOR THE RECORD
Record the model, product and serial numbers of your new
equipment in the spaces provided on page 1. This information,
along with the other ready-reference facts, will be necessary
should you ever require information or service.

Copyright 2010 Carrier Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 02/10
Manufacturer reserves the right to change, at any time, specification8 and design8 without notice and without obligations,
Catalog No: OM5OZH-01
Replaces: 0M50-36