Carrier 38YYS...G Installation manual

R QUALIT
TE
•
L
INSTALLATION MANUAL
SURANC
E
AS
R-410A
Y
YD'S REGI
S
LO
38YY...G9 / 38YYS...G9
IS O
900 1
For operation and maintenance instructions of this unit as well as installation
instructions of the indoor unit, refer to the relevant manuals.
Contents
Dimensions and weight .................................................................................................................
Max. power input ............................................................................................................................
Minimum clearances ......................................................................................................................
Connections ...................................................................................................................................
General information .......................................................................................................................
Warnings: avoid .............................................................................................................................
Refrigerant connections ................................................................................................................
Operating limits ..............................................................................................................................
Electrical connections ...................................................................................................................
Electrical data ................................................................................................................................
Pump down and check the refrigerant charge ...............................................................................
Unit maintenance ...........................................................................................................................
Troubleshooting and guide for the owner .......................................................................................
Page
2
2
3
3
4
5
6/7
7
8/9
9
10/11
11
12
ENGLISH
38YY...G9 / 38YYS...G9 R-410A
Heat pump split system outdoor units
ATTENTION INSTALLERS AND SERVICE TECHNICIANS!
AIR CONDITIONER WITH R-410A–QUICK REFERENCE GUIDE
• R-410A refrigerant operates at 50%-70% higher pressures than R-22. Be sure that servicing
equipment and replacement components are designed to operate with R-410A.
• R-410A refrigerant cylinders are rose colored.
• R-410A refrigerant cylinders have a dip tube which allows liquid to flow out of cylinder in upright position.
• R-410A systems should be charged with liquid refrigerant. Use a commercial type metering device
in the manifold hose in order to vaporize the liquid refrigerant before the entrance in the unit.
• R-410A, as with other HFCs, is only compatible with oils selected by compressor manufacturer following.
• Vacuum pump is not enough to remove moisture from oil.
• POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
• Never open system to atmosphere while it is under a vacuum.
• When system must be opened for service, break vacuum with dry nitrogen and replace filter driers.
• Do not vent R-410A into the atmosphere.
• Use only Carrier indoor units according to qualified matching (Table I).
Unit size
Oil type
Quantity
cc
Drier already installed on
liquid line of the unit
28 - 36 - 48
60
POE
POE
1250
1950
YES
YES
Table I
Heat pump models
38YY... / 38YYS...
Cassette
40KMC---7N
Console
42VMC---N
Satellite
40SMC---N
38YY-028G9
38YY-036G9
38YY-048G9
38YY-060G9
028
036
048
060
028(A)*
—
—
—
028
036
048
060
Power supply: 400V 3N ~ 50Hz
*(A)= Aluminium version
GB - 1
38YY...G9 / 38YYS...G9
R-410A
Dimensions and weight
A
A
B
B
E
D
E
F
C
E
D
E
F
C
Mod. 38YY 28 - 36
Mod. 38YY 48 - 60
28
38 YY---G9 / 38 YYS---G9
36
48
A
B
C
D
E
F
mm
mm
mm
mm
mm
mm
800
803
300
508
146
330
800
803
300
508
146
330
800
1264
300
508
146
330
800
1264
300
508
146
330
kg
kg
67
68
94
96
Mod.
Connections
60
Table II: Connections
Model
Max. pipe length
Max. height difference
28
36
48
60
40 m
50 m
50 m
50 m
25 m
30 m
30 m
30 m
Minimum Nom. thickness are following
1
햲 Outdoor unit
햳 Indoor unit
햴 Height difference
Minimum nominal
thickness (mm)
1/4" - 6.35
3/8" - 9.52
1/2" - 12.70
5/8" - 15.87
3/4" - 19.05
0.80
0.80
0.80
1.00
1.15
3
Pipe diameter
Pipe diameter
Model
Gas
Liquid
Gas
Liquid
(Suction)
(Liquid) (Suction)
(Liquid)
mm
inches
2
GB - 2
Pipe diameter
inches - mm
28
15.87
6.35
5/8"
1/4"
36
48
60
19.05
9.52
3/4"
3/8"
All fittings are flare type.
Use only refrigeration
grade pipes, (Cu DHP
type according to
ISO 1337), seamless,
degreased, deoxidized
and suitable for operating
pressures of at least
4200 kPa and with a
burst pressure of
20700 kPa.
Under no circumstances
must sanitary type
copper pipe be used.
38YY...G9 / 38YYS...G9
R-410A
Minimum clearances
ENGLISH
D
A
C
B
E
Mod.
28
36
48
60
A
mm
100
100
100
100
B
mm
250
250
250
250
C
mm
500
500
500
500
D
mm
100
100
100
100
E
mm
670
670
670
670
F
mm
400
400
400
400
System charge
Suitable up to Extra charge Extra charge (g) with indoor unit
m
g/m
42VMC---(A)*N 40SMC---N
Size
Nameplate
Heat pump
28
2175
8
30
—
100
Heat pump
36
2750
8
70
—
450
Heat pump
48
3650
8
70
—
—
Heat pump
60
4660
8
70
—
450
*(A)= Aluminium version
GB - 3
38YY...G9 / 38YYS...G9
R-410A
General information
Unit installation
Choosing the installation site
R-410A systems operate at higher pressures than standard
R-22 systems. Do not use R-22 service equipment or
components on R-410A equipment.
Read this instruction manual thoroughly before starting the
installation.
• This unit complies with low-voltage (EEC/73/23) and electro
magnetic compatibility (EEC/89/336) directives.
• The installation must be carried out by a qualified installer.
• Follow all current national safety code requirements. In particular
ensure that a properly sized and connected ground wire is in place.
• Check that voltage and frequency of the main power supply are
those required; the available power must be adequate to operate
any other possible appliances connected to the same line.
Also ensure that national safety code requirements have been
followed for the main supply circuit.
• The main supply must be connected to the outdoor unit.
• Connect indoor and outdoor units with field-supplied copper
pipes by means of flare connections. Use insulated seamless
refrigeration grade pipe only, (Cu DHP type according to
ISO1337), degreased and deoxidized, suitable for operating
pressures of at least 4200 kPa and for burst pressure of at
least 20700 kPa. Under no circumstances must sanitary type
copper pipe be used.
• After installation thoroughly test the system operation and explain
all system functions to the owner.
• Leave this manual with the owner for consultation during future
periodic maintenance.
• Use this unit only for factory approved applications: the unit is
suitable for outdoor installation.
• The outdoor unit and its components must be periodically
inspected to check for loose, damaged or broken parts.
If these faults are found and not eliminated, the unit could cause
physical injury to persons and damage to goods and property.
• This installation manual describes the installation procedures of
the outdoor unit of a residential split system consisting of two units
manufactured by Carrier. Consult factory or a qualified system
engineer prior to connecting this unit to any other manufacturer's
indoor unit. Coupling units which have different control systems,
may cause irreversible damage and void the warranty protection.
The manufacturer declines any liability for system malfunction
resulting from unapproved coupling.
IMPORTANT:
During the unit installation make first refrigerant connections
and then electrical connections. If unit is uninstalled first
disconnect electrical cables, then refrigerant connections.
WARNING:
Disconnect the main power supply switch before servicing the
system or handling any internal parts of the unit.
• The manufacturer declines any liability for damage resulting from
modifications or errors in the electrical or refrigerant connections.
• Failure to observe the installation instructions or use of the unit
under conditions other than those indicated in Table III “Operating
limits”, will immediately void the unit warranty.
• Failure to observe electric safety codes may cause a fire hazard in
case of short circuits.
• Inspect equipment for damage due to improper transportation or
handling: file an immediate claim with the shipping company.
Do not install or use damaged units.
• In case of any malfunctioning turn the unit off, disconnect the
mains power supply and contact a qualified service engineer.
• This equipment contains R-410A refrigerant, a substance that is
not depleting ozone gas layer.
• All of the manufacturing and packaging materials used for
your new appliance are compatible with the environment and
can be recycled.
• Dispose of the packaging material in accordance with local requirements.
• This equipment contains coolant that must be disposed of in a
proper manner. When disposing of the unit after its operational life,
remove it carefully. The unit must then be delivered to an
appropriate disposal center or to the original equipment dealer.
• When lifting the unit, absolutely do not use hooks inserted in the side
handles, use special equipment (e.g. lifting devices, trolleys, etc.).
• Carefully recover refrigerant within this unit before final disposal or when
servicing. Never vent refrigerant to atmosphere.
Use approved recovery equipment for R-410A refrigerant.
Do not use R-22 equipments.
Positions to avoid:
• Exposed to direct sun.
• Too close to sources of heat radiation, vapour or flammable gas.
• Particularly dusty areas.
GB - 4
Recommendations:
• Choose a position protected from opposing winds.
• Choose a position sheltered from direct sun.
• Choose an area where air outlet and unit noise will not bother
your neighbours.
• Choose a position that allows for the clearances required.
• Floor structure should be adequately strong to support unit weight
and minimize vibration transmission.
• Consider a position which will not obstruct passageways or doors.
508 mm
330 mm
�
� No. 4 Ø 8 mm pins.
� Protrusion height from the support
surface max. 20 mm.
• Fix the unit with locally purchased bolts buried in the block to
prevent overturning due to strong gusts of wind.
햲
햳
햲 100 mm min.
햳 20 mm gradient.
햴 Gravel-filled trench.
햴
• For heat pump models, unit must be adequately raised above
floor surface.
햵
햶
햵 Drain fitting
햶 Vinyl pipe
• To drain the condensate water to a drain while operating in
heating mode, insert the drain fitting into the hole underneath on
the left of the basin and use a vinyl pipe with a 16 mm internal
diameter. It must not be used at temperatures lower than 0°C.
(not supplied for low temperature versions).
Snow
• If the unit is installed in areas where heavy snowfalls may occur, it
is necessary to raise its level at least 200 mm above the usual
snow level or alternatively to use the outdoor unit bracket kit.
38YY...G9 / 38YYS...G9
R-410A
Warnings: avoid....
ENGLISH
Disconnecting the refrigerant connections after installation:
thiis will cause refrigerant leaks.
Connecting the condensate drain pipe to the outdoor unit.
Excessive height difference between indoor and outdoor unit (see
Table II "Connections"). Excessive distance between indoor and
outdoor units. (see Table II "Connections").
Predominant head winds.
Unnecessary turns and bends in the connecting pipes.
Multiple unit installation with units facing each other.
Any slack in the electrical connections.
Insulating the connecting pipes only partially, which will cause dripping.
Dripping into passageways.
Flattening or kinking of refrigerant or condensate pipes.
Any obstruction of the unit air outlet and intake or any obstacle that is too
close (see minimum clearances required). Installation on grassy ground
or soft surfaces (in these cases a solid foundation must be included).
Soiling of pipe ends.
Allowing piping to get wet before connection.
GB - 5
38YY...G9 / 38YYS...G9
R-410A
Refrigerant connections
Flaring the ends of the tubing
2
1
햲 on the floor;
햳 on the wall using the bracket kit.
Remove protective caps from copper tube ends.
Position tube end downward, cut the tube to the requested length
and remove the burrs with a reamer.
Connect tubing in accordance with the limits shown on Table II
(Connections).
Finger-tighten the fitting several turns, then tighten it with a wrench
by applying the tightening torque indicated in the table.
Do not leave system open to atmosphere any longer than minimum
required for installation.
Oil in the compressor is extremely susceptible to moisture
absorption.
Always keep ends of tubing sealed during installation.
The maximum residual quantity of oil used for tubing is 40 mg/10 m.
Where required, the unit must be charged with additional
refrigerant.
Additional charge must be added using electronic scales and
the service port (5/16") on the suction line.
Charge refrigerant only in liquid phase (bottle turned upside
down or using the specific connection on bottle; see page 1).
Connection to unit
햴
Remove flare nuts from the unit connections and place them on the
tube end.
Flare the tube with the flaring tool.
햴 Adjustable wrench
or torque wrench
L
L
Insufficient tightening torque will cause gas leaks.
Overtightening the fittings will damage the tube flaring and
cause gas leaks.
Flare end must not have any burrs or imperfections.
The length of the flared walls must be uniform.
The unit can be installed:
Valve
1/4”
3/8”
1/2”
5/8”
3/4”
GB - 6
Flare nut
Wrench mm
Nm
17
18
22
42
26
55
29
65
36
100
Pipe diameter
6.35 mm (1/4”)
9.52 mm (3/8”)
12.70 mm (1/2”)
15.87 mm (5/8”)
19.05 mm (3/4”)
Tightening torque
Valve cap
Pressure port cap
Wrench mm
Nm
Wrench mm
Nm
23
20
18
16 - 18
23
20
18
16 - 18
29
40
18
16 - 18
29
40
18
16 - 18
38
40
18
16 - 18
Tightening torque Nm
18
42
55
65
100
Valve needle
Wrench mm
Nm
Allen (hex.) 5
9
Allen (hex.) 5
9
Allen (hex.) 5
13
Allen (hex.) 5
13
Allen (hex.) 5
13
Pressure port
Wrench mm
Nm
–
0.34
–
0.34
–
0.34
–
0.34
–
0.34
38YY...G9 / 38YYS...G9
R-410A
Refrigerant connections
햷
햶 햹
ENGLISH
햵
Three-way valve
Needle valve
Valve cap
Valve needle
Two-way valve
Allen (hex. head) wrench
햸
햾
햺
햹
햳햲
햴
햲
햳
햴
햵
햶
햷
햻
햸
햴
햸
햹
햺
햻
햽
햾
햽
Gas line (large diameter)
Gas line (large diameter)
Flare nut
Indoor unit
Outdoor unit
Vacuum pump
Air purging
헁
Use only a vacuum pump to purge air from the piping.
NEVER use the system compressor as a vacuum pump.
햿
NEVER use the unit refrigerant gas to purge the connecting
pipes.
No additional refrigerant has been provided in the unit for this
purpose.
Remove the caps from the two and three-way valves.
Create a vacuum with a vacuum pump connected to the service
connection of the suction shut-off valve, as shown, keeping the
shut-off valves completely shut until a 50 Pa (0.5 mbar) vacuum
has been reached.
Now open the two-way valve for 3 sec., then quickly shut it to
check for possible leaks.
After the leak check, fully open the two and three-way valves.
Replace caps and check for leaks.
헀
햿 Pipe
헀 Pipe insulation
헁 Fastening tape
Once all connections have been completed, check for leaks by
using a leak detector specific for HFC refrigerants.
Finally wrap the valves and pipes with anti-condensate
insulation and tighten this with tape, without exerting too much
pressure on the insulation.
Repair and cover any possible cracks in the insulation.
Fix the pipes to the wall with hooks or conduits.
Table III: Operating limits (1)
Cooling (2)
outdoor temperature 43°C
Maximum conditions
indoor temperature 32°C d.b.; 23°C w.b.
outdoor temperature 15°C
Minimum conditions
Heating (3)
Mains power supply
Notes:
Maximum conditions
indoor temperature 27°C d.b.
Minimum conditions
outdoor temperature –15°C d.b.; –17°C w.b.
Nominal three-phase voltage
Operating voltage limits
400V 3N~ 50Hz
min. 342V – max. 462V
1. Data referred to the outdoor unit only.
2. According to ISO 5151.2/T1.
3. According to ISO 5151.2/High+.
d.b. - dry bulb; w.b. - wet bulb.
indoor temperature 21°C d.b.; 15°C w.b.
outdoor temperature 24°C d.b.; 18°C w.b.
WARNING:
During heat pump operation unit will undergo several defrost cycles to
eliminate ice that might possibly collect on the outdoor unit in very low
ambient temperatures.
In these cycles, fan speed will automatically reduce and cannot be
varied until defrost cycle is completed.
GB - 7
38YY...G9 / 38YYS...G9
R-410A
Electrical connections
Heat pump unit
햳
햲
Heat pump system
Terminal box legend, all models
Earth
L1 Live power supply
L2 Live power supply
햲 Connecting cable, indoor-outdoor units (field wiring).
햳 Mains supply connecting cable
(field wiring).
L3 Live power supply
N
Neutral power supply
쐃 Indoor unit
R
Live connection indoor/outdoor unit
쐇 Outdoor unit
C
Neutral connection indoor/outdoor unit
쐋 Main switch
Y
Compressor interlocking contact
쐏 Time-delay fuse or circuit breaker
O
Reversing valve control (Heat pump only)
W2 Outdoor fan signal (Heat pump only)
S
Defrost end signal
GB - 8
(see table IV "Electrical data").
38YY...G9 / 38YYS...G9
R-410A
Electrical connections
ENGLISH
• Ensure that main supply connection is made through a switch
that disconnects all poles, with contact gap of a least 3 mm.
• The main supply connecting cable must be H07 RN-F
(or higher) type, synthetic rubber insulation with Neoprene
coating, according to EN 60335-2-40 and HD277.S1 codes.
• When the electric supply cables L1 (R), L2 (S), L3 (T) are
connected inversely, a special “PSC” phase inversion protection
device blocks the compressor to prevent the same from rotating
inversely.
In this case, switch off the electrical supply and check the
correctness of the sequence of the cables of the supply line
connected to the main terminal block (they are probably inverted).
The compressor will only be allowed to work if the phase
sequence is correct.
The phase sequence protection device also continuously monitors
the electrical supply line and if one of the phases is completely
missing it blocks the compressor.
The device only re-starts the compressor after the supply line is
correctly restored.
All the three phase compressors have identical internal wiring.
For this reason when the correct phase connections for a specific
system have been determined, the rotation direction will always be
correct if the same connections are made to the terminal block (for
the other equipment).
Remove electric box cover.
Connect the wires to the terminals according to the wiring
diagram and firmly tighten.
IMPORTANT:
• Make ground connection prior to any other electrical
connections.
Note:
All field electrical connections are the responsibility of the
installer.
• Make refrigerant connections before electrical connections.
When deconnecting, deconnect electrical connections before
refrigerant connections.
Refer to the indoor unit installation manual for sizing the
connection wires between units.
• Make electrical connections between units prior to proceeding
to main supply unit connection.
• Before proceeding with the unit connection to the mains supply
locate live L1, L2, L3 and neutral N, then make connections as
shown in the wiring diagram.
Note:
After connections have been completed, replace electric box
cover.
Table IV: Electrical data
Power input
Starting
current
(2)
(5)
Nominal conditions
400V 3N~ 50Hz
ISO 5151.2/T1
indoor 27°C d.b. 19°C w.b.
outdoor 35°C d.b. 24°C w.b.
Main power
connections (6)
Heating
Cooling
Peak conditions
342V 3N~ 50Hz
ISO 5151.2/T1
indoor 32°C d.b. 23°C w.b.
outdoor 43°C d.b. 32°C w.b.
Nominal conditions
400V 3N ~ 50Hz
ISO 5151.2/High+
indoor 20°C d.b. 15°C w.b.
outdoor 7°C d.b. 6°C w.b.
Peak conditions
342V 3N~ 50Hz
ISO 5151.2/High+
indoor 27°C
outdoor 24°C d.b. 18°C w.b.
Time-delay
fuse
gL type
Wire size
(3-4)
Heat pump
A
A
W
A
W
A
W
A
W
A
mm2
38YY(S)-028G9
37
5.5
2990
7.3
3700
5.0
2550
7.0
3670
16
2.5
38YY(S)-036G9
39
6.3
3295
8.3
4250
5.7
2850
7.8
3890
16
2.5
38YY(S)-048G9
54
7.0
3415
8.4
4060
6.9
3360
8.9
4380
16
2.5
38YY(S)-060G9
60
10.1
5034
12.1
5905
9.3
4451
11.5
5630
25
2.5
Notes:
1.
2.
3.
4.
5.
6.
Unit is suitable for outdoor installation.
Starting current duration is usually lower than 1 sec.
Wire size shown applies to line length up to 15 m.
If the indoor unit is provided with an electric heater, consult indoor unit installation manual for correct sizing of the wires.
Data referred to the outdoor unit only.
The main supply connecting cable must be H07 RN-F (or higher) type , synthetic rubber insulation with Neoprene coating, according to
EN 60335-2-40 and HD277.S1 codes.
GB - 9
38YY...G9 / 38YYS...G9
R-410A
Pump Down and check the refrigerant charge
15
24
22
20
10
18
➀
➂
16
14
5
12
20
25
30
➁
35
40
햲 Superheat °C
햳 Condenser entering dry bulb temperature °C
햴 Evaporator entering wet bulb temperature °C
Pump Down
Pump down is an operation intended to collect all the system
refrigerant in the outdoor unit.
This operation must be carried out before disconnecting the
refrigerant tubing in order to avoid refrigerant loss to the
atmosphere, if it becomes necessary to disconnect the
refrigerant connections for unit repair, removal or disposal; in
this case, after removal, unit must be delivered to an
appropriate disposal centre or the original dealer.
Shut off the liquid valve with the Allen wrench.
Turn the system on in cooling with fan operating at high velocity.
(Compressor will immediately start, provided 3 minutes have
elapsed since the last stop).
After 2 minutes of operation, shut the suction valve with the same
wrench.
Turn the system off and switch mains supply off.
Disconnect tubing.
After disconnection, protect valves and tubing ends from dust.
Connect a gage on low side during a condenser pump down.
Compressor damage may occur if run at a negative suction
pressure.
• R-410A refrigerant cylinders contain a dip tube which allows
liquid refrigerant to flow from cylinder in upright position.
Charge R-410A units with cylinder in upright position and a
commercial-type metering device in manifold hose in order
to vaporize the liquid refrigerant before the entrance in the
unit.
Charge refrigerant into suction-line.
• The above method must be used for heat pump systems
operating in heating, as operating difficulty in the winter season
impedes stable operating conditions.
Hence the refrigerant charge must be checked.
In cooling mode the refrigerant charge check can be carried out
using the superheating method; this is only possible, if the
ambient temperature is above 15°C.
• Superheating method
Check temperature at the points shown in the illustration:
- Te (evaporating temp.) with manometer
- Ta (suction gas temp.) contact thermometer superheat
(Ta - Te) should equal the table value ± 2ºC.
If superheat is outside the indicated limits, proceed as follows:
Check the refrigerant charge
• This check becomes necessary after any refrigerant leak due to
incorrect connection, or after replacement of the compressor.
• The best method to correctly charge refrigerant is to completely
empty the refrigerant circuit using refrigerant recovery
equipment.
Then charge the exact quantity of refrigerant according to the
data shown on the unit nameplate.
This can be done with charging equipment of the “Dial a charge”
type.
GB - 10
• If superheat is lower than the table value, the refrigerant charge
is excessive or the air quantity passing through the evaporator
(indoor unit) coil is insufficient.
If superheat is higher than the table value, the refrigerant charge
is insufficient or the metering device (expansion valve or
capillary) is clogged.
• By knowing the temperature of the air entering the condenser
coil it is possible to determine the correct value of the superheat,
we should have at the compressor inlet.
Wait approx. 5 minutes after adding or removing refrigerant; if
the room conditions or those of the air entering the condenser
vary during the charging operation, repeat all readings.
38YY...G9 / 38YYS...G9
R-410A
Check the refrigerant charge and unit maintenance
ENGLISH
Refrigerant charge control
Heat pump unit
13
13
7 5
7 5 Te Ta
9
9
16
1
8
2
16
1
12
8
2
12
14
14
15
4
11
10
11
6
Ti
15
4
10
6
7
7
Cooling cycle
Heating cycle
Legend:
햲
햳
햴
햵
햶
햷
햸
햹
Outdoor coil
Compressor “scroll”
Metering device
Strainer
Vapor valve
Liquid valve
Service pressure port
Indoor unit coil
햺
햻
햽
햾
햿
헀
헁
헂
Liquid distributor
Cooling metering device
Heating metering device
Additional suction accumulator
Reversing valve
Outdoor coil sensor
Crankcase heater
Discharge muffler
Gas
Liquid + Gas
Liquid
Unit maintenance
The following maintenance operations must be carried out
by qualified personnel.
Cleaning the coil
When necessary, proceed as follows for more careful cleaning
of the coil:
Carefully clean the coil with a vacuum cleaner from inside to
outside.
With the same vacuum cleaner, dust the inside of the fan
compartment and the fan blades.
Avoid any damage to the blades which may cause future
vibrations and noise.
Replace the unit cover and tighten the screws.
After long shutdown periods and at commissioning (for heat
pump models only).
Switch the mains supply OFF.
Remove unit top cover by losening holding screws and lifting the
cover.
Energize the system by putting the main switch to ON without
starting the unit. (The remote control must be in the OFF position
at least 12 hours before the initial start up).
Do not disconnect the main switch during the unit operating
season.
GB - 11
38YY...G9 / 38YYS...G9
R-410A
Troubleshooting and guide for the owner
Troubleshooting
Suction pressure too high:
Compressor and fan of the outdoor unit will not start:
• Internal high pressure relief valve open; check for cause and repair.
• Refrigerant charge too high; drain some refrigerant (see note 1).
• Reversing valve (on heat pump models) faulty or internal leak;
replace.
• Unit not energized; check the main power connections.
• Main switch OFF; check and put to the ON position.
• Main switch fuses have blown; replace.
• Wait for 3 minutes; compressor cycling protection is on.
• Pressure switch open; check and eliminate cause.
• Main voltage too low.
• Electrical connections loose or wrong; check and repair.
Compressor will not start, but outdoor fan is running:
• Electrical connections of compressor loose or wrong; check and
repair.
• Compressor burnt out, seized or protection device on; check for
the cause and replace compressor if necessary.
• Run capacitor faulty (single-phase models); replace.
Compressor starts, but stops due to its overtemperature
protection (other than stops caused by the normal operation
of the thermostat):
• Wrong refrigerant charge (excessive or low) or air or other non
condensable gases in the circuit; drain refrigerant (see note 1),
evacuate and recharge.
• Main voltage wrong (too high or too low).
• Condenser coil (outdoor or indoor, in case of heat pump
operation) obstructed; remove obstructions.
• Outdoor fan off; check cause and repair.
• Run capacitor faulty; check and replace.
• Wrong indoor unit thermostat; replace.
• Refrigerant circuit clogged; check and remove obstructions.
• Reversing valve faulty on heat pump models; replace.
• Expansion device clogged or covered with ice; drain refrigerant
(see note 1), evacuate and recharge.
Compressor runs continuously:
• Unit selected too small for actual air conditioning needs.
• Indoor temperature selection too low (if in cooling) or too high (if in
heating, for heat pump models); check temperature selection.
• Refrigerant charge low; check and add refrigerant.
• Outdoor unit fan faulty; replace.
• Air or other non condensable gases in the circuit; drain refrigerant
(see note 1), evacuate and recharge.
• Obstructions at air intake or dirty indoor unit filters; remove
obstruction or clean filter.
Suction pressure too low:
• Refrigerant charge too low; add refrigerant.
• Evaporator coil (indoor or outdoor, in case of heat pump
models),covered with ice; see the following points.
• Air circulation on the evaporator unit (indoor or outdoor, in case of
heat pump models) not sufficient; check for the cause and repair.
• Expansion device or suction line clogged: check and repair.
• Outdoor fan does not stop during defrost periods (when heating
with heat pump models); check electrical connections.
• Defrost thermostat faulty (heating with heat pump models); replace.
• Contact between tube and defrost thermostat (heating with heat
pump models) faulty; check and repair.
Outdoor fan cycling due to its overtemperature protection:
• Fan capacitor faulty; replace.
• Electrical connection loose; check connections.
• Fan bearing seized; check and repair.
• Expansion device clogged or covered with ice; drain refrigerant
(see note 1), evacuate and recharge.
• Defrost relay open (heating with heat pump models); replace.
Outdoor fan motor running always at low speed:
• A wiring not connected to the board; check connections between
temperature sensor and board.
• Temperature sensor is fault; replace the sensor.
• Electronic board broken; replace board.
Outdoor fan motor running always at high speed:
• Temperature sensor is short circuited; replace temperature
sensor.
• Electronic board broken; replace board.
Note 1:
Do not release refrigerant to the atmosphere; use
refrigerant recovery equipment.
Frequent ice build-up on outdoor coil (during heating with
heat pump units):
• Outdoor fan stopped; check cause and repair.
• Wrong electrical connections on defrost circuit; check electrical
connections and repair.
Discharge pressure too high:
Guide for the owner
• Outdoor coil dirty or obstructed; clean or remove obstructions.
• Condenser fan (outdoor or indoor, in case of heat pump operation)
faulty; replace.
• Refrigerant charge too high; drain some refrigerant (see note 1).
• Air or other non-condensable gases in the circuit; drain refrigerant
(see note 1), evacuate and recharge.
When installation and tests are completed explain the Operation
and Maintenance Manual to the owner, with particular attention to
the main operating modes of the air conditioner, such as:
• Turning the unit on and off.
• Functions of the remote control.
Discharge pressure too low:
• Removal and cleaning of the air filters.
• Refrigerant charge too low; add refrigerant.
• Outdoor coil dirty or obstructed; clean or remove obstructions.
• Indoor unit air filter dirty; clean filter.
Leave the two installation manuals for the indoor and outdoor units
with the owner for future use during maintenance operations or for
any other needs.
GB - 12
L010125H85 - 1002
Via R. Sanzio, 9 - 20058 Villasanta (MI) Italy - Tel. 039/3636.1
The manufacturer reserves the right to change any product specifications without notice.
Order No. 13897-74M10, October 2002. Supersedes Order No. (new).
Printed in Italy