Carrier Harmony 53VMC18A-H Installation and user guide

03502566
SERVICE & MAINTENANCE MANUAL
Revision : (0) - 2009
Specifications are subject to change without notice according to Carrier Policy of continuous development.

TABLE OF CONTENTS
PAGE NO.
1. Precautions for Service & Maintenance 1
2. Split System Description 2
3. Unit Model Designation 3
4. Unit Models & Part Numbers 3
5. Options 4
6. System Operating Limits 5
7. System Safety Protections 5
8. Wiring Diagrams 6
9. Field Electrical Connections Matching 7
10. Refrigeration Cycle – 53QG Series 8
11. Replacing Batteries of Remote Control 10
12. Emergency Operation of Air-Conditioner 11
13. Standard and Optional Air Filters 12
14. Air Filter Cleaning 13
15. Indoor Unit Cleaning 14
16. Considerations After Operational Season and Before Long
Shutdown Period Of Air Conditioner 14
17. Periodical Checks 15
18. Self Diagnostic Function For Malfunction Detection 16
19. Trouble Shooting 17

1
1. PRECAUTIONS FOR SERVICE AND MAINTENANCE
SAFETY CONSIDERATIONS
• Installation of air conditioning equipment can be hazardous due to system pressures and
electrical components.
• The installation of the air conditioner must be done by Carrier or one of Carrier authorized
dealers.
WARNING
• This installation manual describes the installation procedures of Carrier split room air
conditioner consisting of an outdoor unit and an indoor unit manufactured by Carrier.
What is not covered in Carrier warranty?
1- Failure due to wrong electrical connections between the electrical power supply and
circuit breaker of air conditioner leading to fire due to short-circuiting. As these electrical
connections are owner’s responsibility.
2- Failure due to Misuse, Abusing, overloading, negligence of air filters cleaning and
negligence of instructions included in the owner’s manual.
3- Failure due to Accident / Weather Natural catastrophe, accident due to bad weather
(Hail Storm, Sand Storm, lightning, Flooding, Acid Rain and Air Borne fallout, etc).
4- Failure due to damages during transport done through the owner.
5- Failure due to any modifications in the product done through the owner and not done by
Carrier or one of Carrier authorized dealers.
6- Failure due to Installation done through the owner and not done by Carrier or one of
Carrier authorized dealers.
7- Failure due to Service and Maintenance done through the owner and not done by Carrier
or one of Carrier authorized dealers.
8- Failure due to repair by using non-genuine Carrier Parts, or substituting other than
Carrier parts done through the owner and not done by Carrier or one of Carrier
authorized dealers.
9- Product normal sound ( refrigerant – moving parts )
10- Inconvenience or commercial loss is not covered.
The decision of Carrier in ascertaining the same will be final. Any such repairs will be carried -
out at the expense of the owner ( purchaser ).
!

2
Outdoor Unit
2. SPLIT SYSTEM DESCRIPTION
1: Remote control signal receiver.
2: Operating status leds. 6: Supply air outlet.
3: Supply air flap. 7: Characteristics nameplate.
4: Air return grille. 8: Inter connecting tubing.
5: Air filter ( behind return grille ). 9: Condensate drain line.
Floor/Wall/Ceiling Split System
53VMC14-18-24
2
4
5
6
7
8
9
1
3
Indoor Unit

3
3. UNIT MODEL DESIGNATION
4. UNIT MODELS & PART NUMBERS
SPLIT SYSTEMS FOR LOCAL MARKET
System Indoor Unit Outdoor Unit
Compressor
Model P/N Model P/N Model P/N Type Supplier
53VMC14-H
46303279 42VMC14-H
46303290 38VMC14-H
46303278 Rotary LG
53VMC18A-H
46303118 42VMC18A-H
46303276 38VMC18A-H
46303117 Rotary Hitachi
HEAT
PUMP
53VMC24-H
46303359 42VMC24-H
46303292 38QG24-H
46302128 Rotary LG
SPLIT SYSTEMS FOR MILD AMBIENT EXPORT MARKETS
Indoor Unit Outdoor Unit
Compressor
Model P/N Model P/N Type Supplier
42VMC14-H
46303221 38QG15-H
46303300 Rotary Mitsushita
42VMC18A-H
46303533 38VMC18A-H
46303534 Rotary Hitachi
HEAT
PUMP
42VMC24-H
46303233 38QG24-H
46303644 Rotary LG
Indoor Unit Outdoor Unit
Compressor
Model P/N Model P/N Type Supplier
42VMC14-C
46303293 38QG15-C
46302110 Rotary Mitsushita
42VMC18-C
46303294 38QG18-C
46303517 Rotary Mitsushita
COOL
ONLY
42VMC24-C
46303295 38QG24-C
46303365 Rotary Mitsushita
SPLIT SYSTEM FOR HIGH AMBIENT EXPORT MARKETS
Indoor Unit Outdoor Unit
Compressor
Model P/N Model P/N Type Supplier
42VMC18-H
46303219 38QG18-H
46303516 Rotary Mitsushita
HEAT
PUMP
42VMC24-H
46303220 38QG24-H
46303363 Rotary Mitsushita
Indoor Unit Outdoor Unit
Compressor
Model P/N Model P/N Type Supplier
42VMC18-C
46303294 38QG18-C
46303517 Rotary Mitsushita
COOL
ONLY
42VMC24-C
46303295 38QG24-C
46303365 Rotary Mitsushita
VMC
QG
42 = Indoor Unit
38 =Outdoor Unit
18
System
Cooling Capacity
At ISO Conditions
14 = 14,000 Btu/hr
18 = 18,000 Btu/hr
24 = 24,000 Btu/hr
Unit Family
H
C
Unit Type
H = Heat Pump
C = Cool Only
42
38

4
5. OPTIONS
DESCREPTION CONFIGURATION QTY USAGE
Electrical Cables Set
for Heat Pump System
Main Power cable
Outdoor Unit–Circuit Breaker
Power cable
Outdoor Unit – Indoor Unit
Control & Defrost cable
Outdoor Unit–Circuit Breaker P/N : 02500894
Set of 3
To electrically connect between
circuit breaker, outdoor and
indoor units
Electrical Cables Set
for Cool Only System
Main Power cable
Outdoor Unit – Indoor Unit
Power & Control cable
Outdoor Unit – Indoor Unit P/N : 02500893
Set of 2
To electrically connect between
circuit breaker, outdoor and
indoor units
Optional set of air filters
(Carbon air filter + Photo-
catalytic air filter) P/N : 02802563
( for 42VMC14-18-24 )
Set of 2
To eliminate odor and cigarette
smoke in the room air
respectively.
PTC starting device for
38QG15-18-24
P/N : 02501579
1
To start the compressor in
outdoor unit at low voltage down
187V
Floor support for indoor units
42VMC14-18-24
P/N : 46300822
1
To mount the indoor unit on the
floor in case of impossibility of
mounting the unit on the wall

5
6. SYSTEM OPERATING LIMITS *
COOLING HEATING
Difference Dry Bulb
Temp. C°
Wet Bulb
Temp. C° Difference Dry Bulb Temp. C°
Wet Bulb
Temp. C°
Indoor temperature
Maximum
Minimum
32
21
23
15
Indoor temperature
Maximum
27 -
Outdoor temperature
Maximum
Minimum
55
20
-
-
Outdoor temperature
Maximum
21 -
MAIN POWER SUPPLY
Difference Nominal
200-240V/1PH/50HZ
Min. Voltage 187
Max. Voltage 264
NOTES:
* When the unit is operated above or below these limits for a long time, system diagnostics may detect
a malfunction and the unit will not operate properly.
** During heat pump operation the system will undergo several defrost cycles to remove ice that might
collect on the outdoor unit in very low ambient temperature.
After completion of defrosts cycle, the system will normally operate.
7. SYSTEM SAFETY PROTECTION
7-1 FOR HEAT PUMP SYSTEM
PROTECTION TYPE PROTECTION EFFECT OPERATION MODE WHEN ON
Cold draft prevention Indoor fan off Heating mode During unit operation
Defrost cycle Indoor fan off Heating mode During unit operation
Indoor coil
Freeze protection Compressor off Cooling mode During unit operation
Against frequent
Compressor cycling
Compressor
Time delay
Cooling or heating
modes
At unit start-up or change
of operating mode
7-2 FOR COOL ONLY SYSTEM
PROTECTION TYPE PROTECTION EFFECT OPERATION MODE WHEN ON
Indoor coil
Freeze protection Compressor off Cooling mode During unit operation
Against frequent
Compressor cycling
Compressor
Time delay Cooling mode At unit start-up or change
of operating mode

6
8. WIRING DIAGRAMS

7
WIRING DIAGRAMS (Cont.)

8
LEGEND
Earth
LLive power supply.
NNeutral power supply.
RLive connection indoor/outdoor unit.
CNeutral connection indoor/outdoor unit.
YCompressor control.
OReversing valve control.
W2 Outdoor fan motor control.
S Outdoor coil sensor.
LEGEND
Earth
LLive power supply.
NNeutral power supply.
RLive connection indoor/outdoor unit.
CNeutral connection indoor/outdoor unit.
Y
Com
p
ressor control.
9. FIELD ELECTRICAL CONNECTIONS MATCHING
- Connect the power supply to the outdoor unit and then get the power required for the indoor unit from the outdoor unit.
- Refer to wiring diagrams and stickers-caution sticked inside the outdoor & indoor units.
9-1 CONNECTING ELECTRICAL WIRING FOR HEAT PUMP SYSTEM
Sizes of electrical wires connecting outdoor and indoor units
R C Y O W2 S
1 mm2 1 mm21 mm21 mm21 mm21 mm2
9-2 CONNECTING ELECTRICAL WIRING FOR COOL ONLY SYSTEM
Sizes of electrical wires connecting
outdoor and indoor units
R C Y
1 mm2 1 mm21 mm2
200 - 240V ~ 50Hz
Circuit
Breake
r
Main
Switch
R
C
Y
R
C
Y
200 - 240V ~ 50Hz
Circuit
Breake
r
Main
Switch
Indoor Unit
Outdoor
Unit
Outdoor
Unit
Indoor Unit

9
11. REFRIGERATION CYCLE – 53VMC SERIES
HEAT PUMP SYSTEM

10
REFRIGERATION CYCLE – 53VMC SERIES (Cont.)
COOL ONLY SYSTEM

11
12. REPLACING BATTERIES OF REMOTE CONTROL Model 42QG&42VMC 14-18-24
12-1 HOW TO INSERT BATTERIES:
(a) Remove the cover of battery compartment at the back of the remote
control by pressing the tab toward inside, in the direction of the
arrow.
(b) Mount the two-battery size AAA 1.5 Volt supplied with the remote
control. Then close the cover of the battery component.
Note:
During mounting of batteries
check battery symbols (+, -)
indicated in batteries
compartment.
NOTES:
1. The remote control uses two alkaline batteries (1.5V, LRO03x2).
2. Do not use used batteries or batteries of different types, as this may cause the air conditioner to
malfunction.
3. Batteries should only be changed after turning OFF the air conditioner.
4. The average battery life during normal use is approximately one year.
5. When the symbol appears in the display of the remote control, this indicates that the batteries are
exhausted and required to be replaced.
WHEN DIRECTING THE TRANSMITTER OF WIRELESS REMOTE CONTROL TO THE RECEIVER
OF INDOOR UNIT FROM A CERTAIN LOCATION, CHECK THE FOLLOWING POINTS:
1- Avoid direct sunlight on the receiver of indoor unit, which may interfere with good signal reception
2- No obstructions such as curtains or plants should be between the remote control and the receiver of
indoor unit.
3- The maximum operating range for the remote control is approximately 5 meters.
4- The remote control must be directed toward the receiver of indoor unit when pressing the buttons of the
desired functions. An acoustical acknowledgement sound (beep) will indicate that signal has been received.

12
13. EMERGENCY OPERATION OF AIR-CONDITIONER
INDOOR UNITS 42VMC14-18-24-30-36 SERIES
Indoor unit LED’s
• GREEN LED (1) shows the following conditions :
- Fault codes (diagnostic);
- During normal operation, the LED is lit.
Once a failure occurs, the LED flashes at intervals of 0.5 seconds. The fault code is deduced from
the number of times the LED flashes. Between one flash cycle and the next a pause of 5 seconds
elapses.
If the timer mode is active and the unit is immediately restarted after a stop, this LED flashes until a
new signal is sent to the indoor unit.
• YELLOW LED (2) shows the operation in timer mode.
During this operation in this operating mode, the LED is lit .
If the time mode is active and the unit is immediately restarted after a stop, this LED flashes until a
new signal is sent to the indoor unit.
• RED LED (3) gives the following information:
- During normal operation, the LED is OFF;
- During defrost the LED is lit;
- During the test for wired connection, the LED
flashes at 1- second intervals.
Button (5) : “EMERGENCY”
Can be used when the remote control is lost or inoperative.
Use a screwdriver to press the push-button.
Emergency operation:
When the unit is in the OFF mode and the emergency is pressed for 5 seconds, the system will
operate as follows:
- Automatic mode.
- Temperature preset to 22ºC.
- Automatic fan speed.
- Louvers set automatically according to operating mode.
- Timer Functions are inactive.
When a signal is received by the remote control, system operates accordingly.
1 : Green Led
2 : Yellow Led
3 : Red Led
4 : Remote control
signal receiver
5 : “Emergency” button

13
14. STANDARD AND OPTIONAL AIR FILTERS
14-1 The indoor unit of the split air conditioner is factory supplied with
standard anti-bacteria filters to eliminate dust and lint.
14-2 The optional set of air filters can be field installed inside the indoor unit.
The optional set of air filters consists of 2 ( two ) filters:
1. Optional Active carbon air filter is particularly effective in eliminating odor.
2. Optional Photo-catalytic air filter effectively eliminates cigarette smoke in the room air.
14-3 Installation steps of optional set of air filters
Step (1): After opening return air grill, pull the standard air filters.
Step (2): Install optional air filters inside the unit top in the guides specified for filters
then install standard filters.
Step (3): Install return air grille and close it downwards.
Standard Air Filters
Anti-bacteria
Optional Air Filters
Active carbon
air filter
( Black )
Photo catalytic
air filter
( Blue )

14
15. AIR FILTERS CLEANING
- The air filters supplied with the unit are high-efficiency washable and recyclable filters.
- To establish, how frequently these should be cleaned, the operating conditions must be taken
in to account.
- REMOVAL OF STANDARD AIR FILTERS FOR CLEANING:
CONSOLE / UNDERCEILING INDOOR UNITS
Open the return grille without removing the two screws and the central clamp from their position.
Remove acrylic-fiber filters, carbon filter and photocatalytic filter for cleaning.
A: Standard filters
B: Carbon filter (Optional)
C: Photo catalytic filter (Optional)
- CLEANING OF STANDARD AIR FILTERS:
First clean the filter with a vacuum cleaner every month. And Rinse filter under running water, and dry it
- CLEANING OF CARBON FILTER (OPTIONAL FILTER):
First clean the filter by washing it under running water with a neutral detergent every three months.
Leave the filter 2/3 hours to dry in sunlight
- CLEANING OF PHOTOCATALYTIC FILTER (OPTIONAL FILTER):
First clean the filter by washing it under running water without any detergent every three months.
Leave the filter 6 hours to dry and regenerate in sunlight
Notes:
(1) After cleaning, put the filters back in the correct positions.
(2) Before operating the air conditioner, check that air filters are in their places inside unit.
(3) Replace carbon and photocatalytic filters every two years.
C
A
B

15
12h
16. INDOOR UNIT CLEANING
Turn the unit off and switch the mains supply off.
Use only a clean, damp and soapy cloth.
Do not pour any liquids on the unit.
Do not use flammable liquid, solvents or abrasive
powders: these can damage the casing.
Avoid any contact with sources of heat, as hot air can
damage the unit casing.
Clean the infrared control using a damp cloth.
17. CONSIDERATIONS BEFORE A LONG SHUTDOWN
PERIOD OF AIR CONDITIONER
Keep the indoor unit in operation for half a day in the
ventilation (fan only) mode in order to dry all internal
parts.
Switch electric mains supply off.
Take batteries out of the remote control.
Clean indoor and outdoor units.
Clean the air filters and reposition them in the unit.

16
18. PERIODICAL CHECKS
For a good operation of the air conditioner it is recommended to carry out checks and maintenance as
indicated.
Recommended maintenance intervals may very depending on the installation environment, e.g. dusty zones, etc.
Indoor Unit Every Month Every Year
Clean air filter ●(1)
Clean drain pipe (2) ●
Change controller batteries ●
Outdoor Unit Every Month Every Year
Clean outdoor coil from outside (2) ●
Clean outdoor coil from inside ●
Blow air over electric parts (2) ●
Check electric connection tightening (2) ●
Clean fan wheel (2) ●
Check fan tightening (2) ●
Clean drain pan (2) ●
(1) Increase frequency in dusty zones.
(2) Operations to be carried out by qualified service personnel.

17
19. SELF DIAGNOSTIC FUNCTION FOR MALFUNCTION DETECTION
EXPLAINATION OF SELF-DIAGNOSTIC FUNCTION
• Self-diagnostic function is the key for success of air conditioner operation.
• The printed circuit boards existing inside the indoor unit are equipped with self-diagnostic function
to detect malfunction and automatically stops the operation at the air conditioner.
• Once a malfunction is detected, the diagnostic control section will force the system mode to OFF
for 3 minutes. After the OFF delay, system mode releases and allowed returning to its normal state.
The system will be allowed to restart on its own.
• The diagnostic control section will allow the system to fail 5 consecutive times before shutting
down the system.
• If the system is performing an active defrost, both the compressor drive and reversing valve
malfunction test will be cancelled and reinitiated after the following compressor OFF-ON cycle.
• The Unit on lamp is scanned every half-second and the error codes are displayed by the flashing
frequency of unit on lamp. The error codes are displayed during SHUT-OFF (3 minutes off and after
the 5th retry failure).
Malfunction
Reason
Flashing
Frequency
Allowed
Mode
Return Air Sensor 3 Fan Only
Indoor Coil Sensor 4 Fan Only
Compressor Drive 9 Fan Only
Electronic Control PCB (EEPROM) 10 Fan Only
Notes :
1- Prior to the malfunction repair, disconnect the electrical mains supply by moving the circuit
breaker to OFF position.
2- After repairing the malfunction:
2-1 Press Reset button (5)
2-2 connect the electrical main supply by moving the circuit breaker to ON position
2-3 operate the air conditioner by using the wireless remote control.
1
5
1 : Green led flashes
if there is a malfunction
5 : Reset Button

18
15. TROUBLE SHOOTING
TROUBLE REASON ACTION
After batteries have been placed
into the remote control, the
display is not lit.
Batteries are exhausted or have
the wrong polarity.
Replace batteries or check
polarity.
When pressing the recessed
clock adjustment button, hour
figures on display do not flash.
Recessed button has not been
pressed correctly.
Press with a round point, avoid
exerting strong pressure
Recessed button for time
setting is blocked due to
excessive pressure during use.
Check and repair.When pressing any button, all
symbols appear on display.
Remote control has been
irreversibly damaged.
Replace with a new one.
Main switch is OFF. Switch it to ON position.
Remote control batteries are
exhausted.
Replace batteries.
Remote control has not been
pointed correctly to the receiver
of indoor unit.
Turn remote control OFF and
repeat the operation in the
correct direction.
There are obstacles (curtains,
walls, etc.) between the remote
control and the indoor unit
Repeat the operation after
having removed the obstacles.
Receiver on the indoor unit or
the remote control is under
intense sun radiation.
Avoid direct sun on the unit,
shut curtains or shades.
When pressing start button, unit
does not acknowledge signal
with a beep.
OR
When pressing stop button, unit
does not acknowledge signal
with a beep.
OR
When pressing any function
button, the remote control
shows the function requested
on the display, but unit does not
acknowledge signal receipt with
a beep and does not carry out
the function.
Signal transmission is
obstructed by severe
interference from an
electromagnetic field.
Avoid sending signals when
computers or household
appliances (Food processors,
coffee makers, etc.) are
operating close by cellular or
cordless telephones may also
interfere with the control.
Main supply switch is OFF Switch to ON
Fuses or main switch are blown Replace fuses
Protection against frequent
compressor cycling is ON
Wait for 3 minutes.
Air conditioner will not start.
Selected temperature is higher
than the room temperature in
the cooling mode (or lower in
the heating mode).
Correct selected temperature.