Carrier 42XQ Series User manual

42XQ : Cooling only direct expansion Fan Coil Unit (Wireless Control)
42XQA : Cooling only direct expansion Fan Coil Unit (Wired Control)
®
OWNER’S MANUAL
42XQ/XQA
UNDERCEILING
CONSOLE
42XQ 42XQA

Thank you for choosing Carrier!
You can be sure that you’ve made a wise choice, because the same
pride we take in manufacturing the Carrier equipment installed in the
Astrodome in Texas, in the Sistine Chapel, in the Capitol – the seat of
the US Congress – and in thousands of other installations worldwide,
is embodied in the design of the unit you have just purchased.
Oneofthegreatestbenefitstoawaityouwhenusingyourairconditioner
is that, in addition to maintaining a pleasant temperature in the area
where it is installed, the ambient air is also filtered and dehumidified,
thus improving the quality of the air you breathe.
This manual has been created to familiarize you with all of the
technological features and benefits which this air conditioner unit can
offer.
This manual also contains important information regarding the
maintenanceof yournew airconditioner, servicingthe unitand, above
all,runningit inaneconomicalway.Setasidea fewminutestocarefully
read through the contents of this manual and learn to optimize the use
of your new Carrier device in terms of personal comfort and economy
of operation.

CONTENTS
PRECAUTIONS.................................................................................................. 3
Safety considerations 3
DISPLAYS OF THE INDOOR UNIT, LED INDICATORS & CONTROLS............ 6
Error codes 6
Emergency operation 7
REMOTE CONTROL.......................................................................................... 8
Using the selected functions 10
Using the wireless remote control 11
Using the wired remote control 17
Setting the operating mode 19
INFORMATION ABOUT FILTERS.................................................................... 21
CARE AND MAINTENANCE............................................................................ 22
Operating conditions 22
Operation during power outages 22
PRACTICAL TIPS............................................................................................. 23
Cleaning the Indoor Unit 24
Cleaning the Outdoor Unit 24
Cleaning the filters 25

3
PRECAUTIONS
Safety considerations
Theinstallation,servicingandmaintenance
of air conditioning equipment may be
hazardous due to the pressure which the
refrigerant gas exerts on the interior, and
its electrical components. Only specialized
and professionally qualified personnel may
install, repair or perform servicing work on
airconditioningequipment.Non-specialized
people may only perform basic
maintenance work such as: cleaning the
coils and cleaning and/or replacing the
filters.
All other types of maintenance work may
only be performed by specialized
personnel. To perform such work, the
installer must follow the safety standards
applicable, and must wear safety goggles,
clothing and gloves suitable for this
purpose. Appropriate protection must be
used during welding work; a fire
extinguisher must always be kept close to
hand.
For your safety, read these instructions
through carefully and respect all of the
labels marked WARNING below.
WARNING or CAUTION contained in this
manual or attached to the housing of the
unit.
Consult your local regulations applicable
with respect to electrical installations for
special requirements.
Recognize the safety information
The symbol “ ” indicates a safety alert.
When you see this symbol, it is because
there is a potential risk of material damage
orpersonal injury. Understand the meaning
of the words DANGER,WARNING AND
CAUTION. These words are used in
conjunction with the alert symbol.
DANGER means situations with a severe
risk to injury to people, including the risk of
death. The word WARNING means
situations which could result in personal
injury,including death.ThewordCAUTION
indicates unsafe practices which could
result in minor personal injury or material
damage.
• Do not attempt to interconnect units
from different manufacturers without
first consulting your Carrier
representative or an engineer
specializing in air conditioning. The
incompatibility between the indoor
and outdoor unit and its control
devices could cause serious problems
for both units and invalidate the
manufacturers’ warranty coverage.
Carrier accepts no liability and will
cancel the product warranty if these
installation instructions are not
followed as indicated, or if the wiring
is changed. Consult your preferred
Carrier representative for further
details.
WARNING
• Before installing, modifying or performing
servicing work on the system, check
that the electrical power supply to the
unit has been switched off. Check that
there is not more than one power
switch. Check and label each switch
present with the appropriate wording.
Electric shocks can cause personal
injury, and even death. If the power
supply cable is damaged, it must be
replaced only with an authorized
Carrier spare part by its network of
authorized dealers.

4
CAUTION
DISCONNECTING THE UNIT FROM
THE MAIN POWER SUPPLY
These units must be connected to the
main electrical power supply through a
circuit-breaker or switch fuse with an
appropriatecapacityandwithaminimum
separationbetweenthe contacts of 3mm.
Ifthis is not possible, a contact/container
combination equipped with an active
earth wire must be used. The contact
musthave easy access after installation.
The contact must be disconnected from
thereceptacletoensurethat no electrical
power gets to the unit. It is vitally
important to follow the safety standards
in force at the connection location and
also to check that the electrical power
supply is actively equipped with an earth
cable.
WARNING
Do not attempt to disconnect the unit
at the main power switch. Always use
the unit’s control when you want to
disconnect the system.
1) Do not spray flammable aerosols near
to the unit. The unit may be damaged if it
comesintocontactwithgasoline,solvents,
benzene,insecticides or other chemical
substances.
2) To prevent electric shocks, never splash
water into either the indoor or outdoor
units.
3) Donotinsertyourhandsorfingers,orplace
objectsinsidetheairdischargegrilleofthe
outdoor unit, because the fan rotates at
very high speeds, which may cause
serious personal injury.