Carrier 42XQ Series Instructions and recipes

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42XQ : Cooling only direct expansion Fan Coil Unit (Wireless Remote Control)
42XQA : Cooling only direct expansion Fan Coil Unit (Wired Remote Control)
INSTALLATION AND
START-UP INSTRUCTIONS
UNDERCEILING/CONSOLE FAN COIL UNIT
42XQ/XQA
50/60Hz
®
Carrier
International
Sdn. Bhd.
Malaysia
42XQ 42XQA
MODEL W (mm) D (mm) H (mm) Weight (kg)
42XQ/XQA 020/004* 23
42XQ/XQA 025/006* 1020 23.5
42XQ/XQA 030/007*/008* 26.1
42XQ/XQA 040/010* 1200 625 232 27.2
42XQ/XQA 050/012* 37.6
42XQ/XQA 060/014* 1650 40.1
*Model code for Thailand market only (50Hz)

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CONTENTS
1-Introduction................................................................................................................ 3
2-Safety Instructions..................................................................................................... 3
2.1 - Capacity Label.................................................................................................. 3
3-Receiving and Inspecting the Units............................................................................ 4
4-Installation
4.1 - General Recommendations...............................................................................5
4.2 - Basic Installation Procedures............................................................................ 5
4.3 - Installing the Indoor Units..................................................................................6
5-Interconnection Pipes
5.1 - Suspending and Mounting the Interconnection Pipes......................................11
5.2 - Evacuating the Interconnection Pipes..............................................................11
5.3 - Adjusting the Gas Load................................................................................... 12
5.4 - Gap Between the Units....................................................................................13
5.5 - Interconnection Junctions................................................................................13
6-Expansion System....................................................................................................15
7-Electrical Installation and Diagrams
7.1 - Instructions for the Electrical Installation of the Equipment..............................16
7.2 - Electrical Box 42XQ.........................................................................................16
7.3 - Changing the Wireless Remote Control to a Wired Remote Control................17
7.4 - Electrical Diagram for Indoor Unit (220-240V output signal to compressor) ... 20
7.5 - Electrical Diagram for Indoor Unit (24V output signal to compressor)..............21
7.6 - Electrical Diagram and Cold-Cycle Interconnection Diagram
(50Hz Cooling only).........................................................................................22
8-Configuring the System
8.1 - Changing the Configuration of the Unit from Underceiling to Console.............23
8.2 - Positioning the Air Deflectors According to Console or
Underceiling Configuration.............................................................................. 23
8.3 - Configuring the Unit........................................................................................ 24
8.4 - Configuring the Wireless Remote Control....................................................... 25
8.5 - Configuring the Wired Remote Control (CRC).................................................26
8.6 - Function Test...................................................................................................28
8.7 - Selecting the Addresses of the Units.............................................................. 29
8.8 - Emergency Operation..................................................................................... 29
8.9 - Error Codes.................................................................................................... 30
9-Initial Start-up........................................................................................................... 31

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This manual is intended for technicians in the network of accredited Carrier
installers, who are appropriately trained and qualified, to assist them with installation and
maintenance procedure. It must be stressed that any repair or servicing work may be dangerous
if it is performed by unauthorized persons. Only professionals accredited and trained technical
personnel may install, start-up and perform any maintenance on the equipment discussed in
this manual. Please contact the nearest Carrier representatives if you still need additional
information after reading this manual!
The new indoor units in conjunction with the outdoor units have been designed to offer safe
and reliable service if operated within the specifications dictated for the project. However,
due to this design, the issues relating to the installation, initial start-up and maintenance
must be rigorously observed.
1INTRODUCTION
2SAFETY INTRODUCTIONS
•Always keep a fire extinguisher close
to the working location. Check the
extinguisher periodically to verify that it is
completely full and work perfectly.
•Whenever working on the equipment,
always pay attention to all safety notices
written on the labels attached to the units.
• Always follow all the applicable safety
standards and use personal clothing and
equipment. Wear gloves and protective
goggles whenever handling the units or the
refrigerant of the system.
•Check the weights and dimensions of the
units to ensure appropriate and safe
handling.
ATTENTION !!!
•Learn to use oxyacetylene equipment
safely. Leave the equipment in a ertical
position inside the vehicle and also at the
job site.
•Use dry nitrogen to pressurize and check
for leaks in the system. Use a good
regulator. Take care not to exceed 200
psig of testing pressure in the rotating.
•Before performing work on any of the units,
always disconnect the pressure feed.
•Never insert your hands or any object into
the units when the fan is running.
ATTENTION !!!
2.1 Capacity Label
The capacity label is located inside the indoor unit. In addition to the model and serial number,
this label provides technical data about the indoor unit, such as: voltage, frequency, phase,
refrigeration capacity, power consumption and current.

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•To prevent damage during movement or transportation, do not remove the units from their
packaging until they arrive at the final installation location.
•Prevent ropes, chains or other equipment from leaning on the units.
•Respect the stacking limits indicated on the packaging of the units.
•Do not swing the outdoor unit during transportation or tilt it at more than 15oto the vertical
plane.
•To retain the guarantee, prevent the units from being exposed to possible work accidents,
and arrange for their immediate transfer to the place of installation or another safe location.
•When unpacking the units and removing the protective expanded polystyrene (isopor)
packaging, do not throw away this polystyrene immediately, because they may be used as
protection against dust or other harmful agents until the work and/ or installation is complete
and the system is ready to be brought into operation.
3RECEIVING AND INSPECTING THE UNITS
ATTENTION !!!
Never hang or load the indoor unit by the plastic sides.
Secure it to the metal parts as shown in Figure 2.
Fig. 2 - Handling the indoor unit

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First of all, consult the applicable standards or regulatory codes for installing the equipment
in the selected location to ensure that the envisages system is compliant with these standards
and regulations.
In addition, prepare a careful plan of the positions of the units to prevent possible interference
with any kind of pre-existing (or scheduled) equipment or facilities, such as electrical
installations, water mains, sewerage systems, etc.
Install the units so that they are free of any kind of obstructions of the air intakes or air
discharges.
Select locations equipped with access spaces to facilitate different types of repairs or servicing
work and to leave room for the routine of pipes (copper pipes which interconnect the units,
electrical wiring and drainage).
Check that the external location is free of dust or other suspended particulate matter which
could possibly obstruct the vanes of the outdoor unit.
It is essential for the indoor unit to posses a hydraulic line to drain off the condensate.
This hydraulic line must have a diameter of no less than 3/4" and, after the discharge, must
posses a siphon to guarantee the perfect capture and sealing of the air. During the initial
start-up, this siphon must be prefilled with water to prevent air being suctioned from the
drainage pipe.
Draining the outdoor unit only becomes necessary when it is installed in a high position and
constitute a dripping risk.
4INSTALLATION
4.1 General Recommendations
4.2 Basic Installation Procedures
INDOOR UNIT
Selection of the location
OUTDOOR UNIT
Selection of the location
Selection of the installation profile
Drilling the wall - Ceiling/Positioning
Positioning of the interconnection pipes
Installation of the drain pipes
Assembly
Installation of the drain pipes
Assembly
Connection the interconnection pipes
Electrical Interconnection
Final Finishing
INTERCONNECTION

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Before performing the installation, read these instructions carefully to ensure that you are
familiar with the specifications of the unit.
The dimensions and weight of the unit can be found in the cover page.
The rules presented below are applicable to all installations:
a) Prepare a careful plan of the positions of the units to prevent possible interference with
any kind of pre-existing (or scheduled) equipment or facilities, such as electrical installations,
water mains, sewerage systems, etc.
b) Install the unit where it is free of any kind of obstruction of the air circulation, both in the air
intake and the air discharge.
c) Select a location with sufficient space to permit repairs and general maintenance work.
d) The location must permit the routing of the pipes (system pipes, electrical wiring and
drainage).
e) The unit must be level after installation.
4.3 Installing the Indoor Units
4.3.1 GENERAL RECOMMENDATIONS
Fig. 4 - Dimensions of the Indoor Unit
Dimensions (mm)
Model No. X Y Z
42XQ/XQA 020, 025 & 004*, 006* 1020 934 964
42XQ/XQA 030, 040 & 007*, 008*, 010* 1200 1114 1144
42XQ/XQA 050, 060 & 012*, 014* 1650 1564 1594
*Model code for Thailand market only (50Hz)

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a) The unit must only be installed at the
following positions: Horizontal under the
ceiling, vertical on the wall. (See Fig. 5
and 6).
b) The unit’s position must permit the
uniform circulation of air throughout
the entire environment (Fig. 7).
c) The indoor unit comes factory supplied with
(2) fixation support for installing it
suspended from the ceiling or fixed to the
adjacent wall (Fig. 8).
4.3.2 PLACEMENT AT THE LOCATION
NOTE
To fix the indoor unit in place, it is necessary
to remove its side covers as described in
subsection 4.3.3.
d) Fig. 8 indicates the position of the
supports. Install the fixation supports in
the ceiling using assembly screws, nuts
and washers.
Fig. 5 - Underceiling assembly
NOTE
Avoid placing the indoor unit in locations in
the vicinity of obstacle to the airflow which is
necessary for the correct functioning of the
equipment.
Fig. 6 - Wall assembly (console)
Fig. 7 - Position of the indoor unit in the environment
Fig. 8 - Supports and drilling for fixation

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•Fig. 9 shows the position of the screws to be removed to disassemble the plastic
sides of the indoor unit.
•To access the two screws indicated by the number , it is necessary to remove the air
filters from the ends.
•To access the screw shown in the detail (present on both sides), with the number , it is
necessary to lift up the horizontal deflector.
•The right side gives access to the connections of the suction, expansion and drainage
pipes, whereas the left side gives access to the electrical box and the electrical connections.
4.3.3 REMOVING THE SIDES
1
2
Fig. 10 shows the position of the screws to be removed to disassemble the grilles which
gives access to the ventilation system assembly.
Before removing the grilles, it is necessary to remove the side covers first. Then remove the
filters and the three screws which hold the upper part of each grilles - indicated by the
number on the illustration. The lower part of the grilles is only slotted into the indoor unit.
Fig. 9 - Position of the screws for side removal
4.3.4 REMOVING THE GRILLES
1
Fig. 10 - Position of screws for grille removal

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Depending on whether the unit is installed on the wall (console) or ceiling (underceiling), the
pipes for draining off the condensate and also the interconnection pipes must be routed
differently.
Fig. 11, 12 and 13 show the installations on the wall and ceiling and where these pipes must
be routed, as well as where it is necessary to break the indentation in the right-hand side
cover of the indoor unit.
4.3.5 DRAINING OF THE CONDENSATE
Fig. 11 - Drainage pipes for underceiling assembly
NOTE
Insulate the drainage pipe to a minimum
thickness of 5mm to prevent
into the device.
Fig. 13 - Indentations for pipe discharge
Fig. 12 - Drainage pipes for wall assembly

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To guarantee efficient drainage:
a) Ensure that the unit is level, with a
slight inclination towards the drainage
side - approximately 2o(Fig. 14).
b) The unit uses gravity drainage. However,
the drainage pipe must have a downward
slope. Avoid the situation shown in
Fig. 15.
Fig. 14 - Drainage inclination
Fig. 15 - Inefficient drainage scenarios

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5INTERCONNECTION PIPES
5.1 Suspending and Mounting the Interconnection Pipes
Always insist that the interconnection pipes
are fixed appropriately by means of supports
or crossbeams, preferably both.
Insulate them using circular neoprene rubber
and then wrap finishing tape around them
(Fig. 16).
Since the expansion system is located in the
outdoor unit, it is necessary to create the
insulation of the expansion pipe which
interconnects the indoor unit and the outdoor
unit.
Test all of the welded and flanged
connections for leaks (maximum testing
pressure: 200 psig). Use a pressure regulator
in the nitrogen cylinder. If convenient, route
the electrical interconnection together with
the copper pipes as shown in Fig. 16. Fig. 16 - Interconnection Pipes
5.2 Evacuating the Interconnection Pipes
The outdoor units with 20, 25 and 30,000 btu/h are produced in the factory preloaded with
the refrigerant necessary for use in a system with interconnection pipes up to 7.5m long, i.e.
the load for the outdoor unit, the load for the indoor unit and the load necessary to join an
interconnection pipe up to 7.5m long.
The outdoor units of 40, 50 and 60,000 Btu/h are produced in the factory with 1kg holding charge.
For more information regarding the additional gas load, refer to the table below:
IMPORTANT !!!
Note : * Model code for Thailand market only. Outdoor unit connection for reference only, refer to specified outdoor unit installation manual for outdoor unit pipe size.
** Gas load in additional to the normal load for a pipe 7.5m long.
Model Diameter of Suction Diameter of Diameter of Diameter of Max Change Additional
42XQ / Connections Expansion Connections Suction Pipes Expansion Pipes Drop in Level Gasload
XQA Indoor Outdoor Indoor Outdoor 0-15 15-25 0-15 15-25 (m) Above 8m** (g/m)
020 5/8" 1/2" 3/8" 1/4" 5/8" 1/4" 7 8
004* 1/2" 1/2" 1/4" 1/4" 5/8" 1/4" 7 8
025/006* 5/8" 5/8" 3/8" 1/4" 5/8" 1/4" 7 12
030 3/4" 3/4" 3/8" 3/8" 3/4" 3/8" 7 19
007*/008* 5/8" 3/4" 3/8" 3/8" 3/4" 3/8" 7 19
040/010* 3/4" 3/4" 3/8" 3/8" 3/4" 3/4" 3/8" 3/8" 7 80
050/012* 3/4" 3/4" 3/8" 3/8" 3/4" 3/4" 3/8" 3/8" 7 85
060/014* 3/4" 3/4" 3/8" 3/8" 3/4" 3/4" 3/8" 3/8" 7 90
(50Hz)
Note : ** Gas load in additional to the normal load for a pipe 7.5m long. Refer to specified outdoor unit installation manual for outdoor unit pipe size.
Model Diameter of Suction Diameter of Max Change Additional
42XQ / Connections Expansion Connections Drop in Level Gasload
XQA Indoor Outdoor Indoor Outdoor (m) Above 8m** (g/m)
020 5/8" 3/8" 7 8
025 5/8" 3/8" 7 12
030 3/4" 3/8" 7 19
040 3/4" 3/8" 7 80
050 3/4" 3/8" 7 85
060 3/4" 3/8" 7 90
(60Hz)
NOTE
For lengths of up to 8m, an additional gas load is NOT necessary.

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Since the interconnection pipes are created on site, it is essential to clean and
evacuate the pipes and the indoor and outdoor units.
NOTE
Cleaning must be performed by circulating
nitrogen through the pipes of the system.
Cleanliness is extremely important because
it prevents dirt resulting from the installation
from getting inside the pipes and causing
problems later.
The access points are the service
valves on the outdoor unit.
The valves leave the factory in the closed position
to keep the refrigerant in the outdoor unit.
To perform the evacuation, keep the valve in
the closed position and connect the manifold
hose to the valve and the other end to the
vacuum pump.
It is recommended to proceed with the
evacuation of the two connections of the
service valves simultaneously.
The range to be reached must be located
between 250 and 500 microns.
ATTENTION !!!
Never load liquid into the suction service
valve. When you want to do this, use a
service valve for the expansion pipe.
IMPORTANT !!!
5.3 Adjusting the Gas Load
To adjust the refrigerant load in the machines, superheat can also be used as a
perimeter. (Consider a range of 5 to 7oC)
SUPERHEAT
1. Definition:
Difference between the suction
temperature (Ts) and the saturated
evaporation temperature (Tes).
SA = Ts - Tes
2. Measuring equipment required:
•Manifold.
•Bulb thermometer or electronic thermometer
(with temperature sensor).
•Insulation tape or foam.
•Pressure - Temperature conversion
table for R-22.
3. Measuring steps:
1o-Bring the bulb or sensor of the thermometer
into contact with the suction pipe 15cm
from the intake of the condenser. The
surface must be clean and the measurement
is performed on the upper part of the
pipe to prevent incorrect readings.
Cover the bulb or sensor with foam to
insulate it from the ambient temperature.
2o-Install the manifold on the suction
pipe (low pressure gauge).
3o-Once the operating conditions have
become stabilized, read the gauge
pressure of the suction pipe. Obtain
the saturated evaporator temperature
(Tes) by consulting the R-22 table.
NOTE
4o-Read the suction temperature (Ts)
shown on the thermometer. Take several
readings and calculate their average,
which will be the adopted temperature.
5o-Subtract the saturated evaporation
temperature (Tes) from the suction
temperature. The difference represents
the superheat.
6o-If the superheat is between 5 & 7oC, the
refrigerant load is correct. If it is below this
range, too much refrigerant is being injected
into the evaporator, and it is necessary
to remove refrigerant from the system.
If the superheat is high, too little refrigerant
is being injected into the evaporator, and
it is necessary to increase the refrigerant
in the system.
4. Calculation example :
-Suction pipe pressure (pressure gauge)..75 psig
-Saturated evaporation temperature (table)..7oC
-Suction pipe temperature (thermometer)..13oC
-Superheat (subtraction)..........................6oC
-Superheat OK - correct load
Before starting to operate the equipment,
after adding the additional refrigerant load (if
necessary), open the service valves on the
outdoor unit.
ATTENTION !!!
Do not forget to purge the air from the
hose.
•After creating the vacuum, add
positive pressure with R-22 so that
the vacuum is broken.
To proceed with loading the refrigerant, simply
keep the service valve in the factory position
(closed) and connect the manifold hose to
the valve (Schrader valve) of the service valve.

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5.4 Gap Between the Units
In the event that there is a gap of more than
5m in the level of the units and the indoor
unit is at the lower level, a siphon for a 3m
gap must be installed in the suction pipe (see
Fig. 17).
In installations where the indoor unit and the
outdoor unit are at the same level or where
the indoor unit is at higher level, it is
necessary to install a siphon followed by an
inverted “U” after the discharge from the
indoor unit, in the suction pipe. The upper
level of this siphon must be at the same level
as the highest point of the indoor unit.
When bending the pipes, the bending radius
cannot be less than 100mm.
IMPORTANT !!!
IMPORTANT !!!
Fig. 17 - Gap between the units
Respect the equivalent maximum distance
indicated for the pipes, giving consideration
to the fact that it is the result of adding the
equivalent distances of the pipe curves in a
straight line.
5.5 Interconnection Junctions
The equivalent length limits and gap
indicated for the units must be respected.
The indoor and outdoor units have flange-nut
type connections on the fluid and suction
discharge connections coupled to the
respective service valves. See Fig. 18.
When we remove the nut from the valve body
(Fig. 19), we find a hexagonal central cavity.
If necessary, use a suitable Allen key to
change the position of the service valve
(clockwise to close, anti-clockwise to open).
The service valves must be opened only after
performing the connection pipes and
additional load; otherwise there is a risk of
losing the entire refrigerant load in the
outdoor unit.
CAUTION !!!
Fig 18 - Service valve of the suction and fluid pipes
Fig. 19 - Service valve without the protection nut

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To make the connection between the
refrigerant pipes of the respective service
valves, proceed as follows:
a) If necessary, weld the pipes that link the
outdoor and indoor units with
phoscopper solder and solder flux to
prevent the formation of copper
oxide. Release nitrogen flow during
the welding.
b) Attach the nuts which are pre-fitted
in the connections of the indoor and
outdoor units to the ends of the
suction and fluid pipes.
c) Once item “b” has been performed,
create the flanges at the end of the
pipes. Use a flange at the end of the
pipes. Use a flange of a suitable
diameter.
d) Connect the two flange nuts to the
respective service valves.
Remove the flange nut from the unit and
position it with care in the copper pipe. Create
the flange at the end of the pipe using a
flange.
Insert a plug or seal the flanged pipe with
adhesive tape to prevent dust or humidity
entering the pipe until it is used.
Take care to place refrigeration oil on the
surfaces in contact between the flanged end
and the joint, before connecting them
together. This is done to prevent any loss of
refrigerant.
To achieve a good joint, keep the coupling
pipe and the “flare” pipe firmly connected
while performing a slight manual threading.
Then press firmly.
IMPORTANT !!!
IMPORTANT !!!
NOTE
Fig. 20
Avoid loosening the connections after
tightening them to prevent loss of refrigerant.
Flanging procedure
Cut the copper pipe to the appropriate size
using a pipe cutter.
It is recommended to cut approximately 30 to
40mm more than the estimated size.
Remove the burrs from the end of copper pipe
using a suitable tool (of the rosqueira type),
keeping in mind that a copper burr in the
refrigeration circuit could cause serious
damage to the compressor. This procedure
is very important and must be performed with
great care.
When removing the burrs, make sure that the
end of the pipe is turned downwards to prevent
any particles falling inside the pipe.

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For the capacities 20,000 to 30,000 Btu/h, the expansion is performed via a capillary located
in the outdoor unit.
For 40,000 Btu/h and above, the expansion is performed in the indoor unit by means of a
system called the “piston”.
The expansion system kit accompanies the
indoor unit models 40, 50 and 60,000 Btu/h and
must be positioned in the indoor unit
according to the adjacent illustration.
6EXPANSION SYSTEM
This system with a piston according to Fig. 22 contains a small part with a fixed calibrated
orifice which is easily removed, on the inside of a nipple for connecting the 3/8" flange nut to
the fluid pipe.
The application characteristics of the PISTON are used due to the more precise content of the
mass flow of refrigerant gas to the inside of the indoor unit compared to the capillary pipe system,
for example. In addition to this, the PISTONS are easy to maintain.
NOTE
Fig. 21 - Installing the expansion system kit
Fig. 22

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For all indoor connections (between the units) and outdoor connections (power supply
and unit), low-voltage electrical installations must be observed. The main power supply
and control cables must be made of copper and/or aluminium, with PVC-type insulation
for a minimum temperature of 70oC.
The maximum distance between the two voltage points is 50m. For values above 50m, it
is recommended to verify the specification of new gauges and must comply with local
codes.
For the cable gauge values of the main power supply, presented in the tables, the use of
copper and/or aluminium cables was considered, with insulation of the PVC 70oC type
and conductors loaded according to the local codes.
For the control power supply cables between the units, the use of a minimum
1.5mm2(70oC) gauge is recommended.
7ELECTRICAL INSTALLATION AND DIAGRAMS
7.1 Between the Units7.1 Electrical Installation Instructions
7.2 Electrical Box 42XQ
Fig. 23 - Slots and fixation of the electrical box of indoor unit
The fixation of the electrical box is performed
by means of slots , , and , and by
means of slots , , and .
12 3
4 5 6 7

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Electrical wiring
Depending on whether the unit is installed
on the wall (console) or the ceiling
(underceiling), the electrical wiring of the
indoor unit must be routed differently.
Fig. 24 shows the positions where the
existing indentation in the left-hand side
cover of the indoor unit must be broken to
route the wiring.
7.3 Changing the Wireless Remote Control to a Wired Remote Control
To modify the option to use the indoor unit
from the wireless remote control to the wired
remote control, the following steps must be
followed - according to the illustrations on the
following pages:
-Disconnect the intermediate plug which
links the three-way cable of the board to
the display, indicated by the number ,
and connected to the main board.
-This cable will remain loose inside
the indoor unit.
-Connect the intermediate plug to the
three-way cable of the wired remote
control, indicated by the number .
Fig. 24 - Indentation of wiring output
1
2
The Split Space is factory fitted to operate
with the Wireless Remote Control kit.
NOTE

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Fig. 25 - Changing the remote control use option (external connections)

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Internal connection of the wired remote control:
-Remove the rear cover of the wired
remote control to connect the threeway
cable.
-The terminals are located in the rear
part of the cover:
-Insert the cables in the terminals
according to the correspondence of
the colors.
-Reattach the cover and close the
wired remote control.
Terminal (P) - Yellow
Terminal (G) - Orange
Terminal (C) - Brown

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Electrical interconnection in the Terminal Plate of the Indoor Unit 42XQ
7.4 Electrical Diagram for Indoor Unit (220-240V output signal to compressor)
Fig. 26
Fig. 27