Carrier 50ZP User Manual

COMMERCIAL.

UNITARY

SYSTEMS

50ZP

Packaged Air Conditioner

A Guide to Operating and

Maintaining Your Cooling Unit

NOTE TO INSTALLER:

This manual should be left with the equipment
owner.

A WARNING

Before performing recommended maintenance, be sure
main power switch to unit is turned off. Electrical shock
could cause personal injury

50ZP Packaged Air Conditioner

Book|1 |4 PC 111 Catalog No 535-046 Printed in U S A Form 50ZP-1SO Pg 1 12-95 Replaces: New
Tab 1b 6b

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.

WELCOME TO EFFICIENT COOLING

COMFORT

Congratulations on your excellent choice and sound in

vestment in home cooling comfort!

Your new air conditioner represents both the latest in en
gineering 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 energy-efficient and re
liable air conditioning products available today. To assure its
dependability, spend just a few minutes with this booklet now.
Learn about the operation of your air conditioner and the

small amount of maintenance it takes to keep it operating at

its peak efficiency.

With minimal care, your air conditioner 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 unnec

essary service calls, familiarize yourself with the following
facts.

A WARNING

Improper installation, adjustment, alteration, service, main

tenance or use can cause explosion, fire, electrical shock

or other conditions which may cause personal injury or

property damage. Refer to this manual. For assistance

or additional information consult a qualified installer,

service agency, distributor, or branch. The qualified in

staller or agency must use only factory authorized kits

or accessories when modifying this product.

Your air conditioning system should never be operated with

out a clean air filter properly installed. Plan to inspect the

filter periodically. A clogged air filter will increase oper

ating 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 com

monly found obstructing grilles. Restricted airflow less

ens 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 accu

mulate around or on top of the unit Maintain a 12-in. mini

mum clearance between the outdoor unit and tall grass,

vines, shrubs, et cetera.

Your multipurpose indoor thermostat is the control center

for your air conditioning 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 dam

age to the unit.

Thermostat “jiggling” causes rapid-cycling, which is po

tentially damaging to the compressor. Do not move the

temperature selector on the thermostat for any reason for
at least 5 minutes after the compressor has shut oif.

You may find that you can maintain greater personal com
fort by running the fan continuously. “Air pockets” can
form due to the structure of the building, placement of reg
isters, et cetera. These air pockets may be too cool or warm
for your liking. Continuous fan operation minimizes any
temperature differences. Also, systems equipped with elec
tronic air cleaners and/or humidifiers offer the added ben
efits of having the air continuously cleaned year-round, and

humidified during the winter season.

Your air conditioner will remove humidity from your home
during the cooling season. After a few minutes of opera
tion, you should be able to see water trickle from the
condensate drain of the cooling coil. Check this occasion
ally 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.

OPERATING YOUR AIR CONDITIONER

The operation of your air conditioning system is con
trolled by the indoor thermostat. You simply adjust the ther
mostat and it maintains the indoor temperature at the level
you select. Most thermostats for air conditioning systems have
three controls. These are the temperature control selector,
FAN switch, and SYSTEM switch.

The temperature control selector is a dial or lever that al
lows you to establish the degree of temperature that you wish
to maintain for your personal comfort. Some thermostats pos
sess two temperature control selectors: one for setting the
temperature desired during the cooling cycle, and one to set
the heating operation temperature (if the accessory electric
heater is used). Typical settings are 78 degrees Fahrenheit
for cooling and 68 degrees 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 air conditioner is operating. When the
FAN switch is set at the ON position, the blower will tun

continuously.

Typically, the SYSTEM switch on your thermostat offers
the following selections: COOL, OFF, and HEAT. Your ther
mostat may also have a fourth selection, AUTO. The air con
ditioner will not operate when the SYSTEM switch is set at
the OFF position. With the SYSTEM switch set at COOL,
the cooling section of your comfort system will operate when
the indoor temperature rises above the level that you wish to
maintain With the SYSTEM switch set at the HEAT posi
tion, the accessory electric heater will operate automatically
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 cool
ing 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.

Cooling Cycle — When operating in the cooling cycle,
your air conditioner will run until the indoor temperature
is lowered to the level you have selected. On extremely
hot days, your air conditioner 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 air conditioner 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

H-R