Carrier 38BC, 38BCS, 38BH user guide manual

38BC / 38BCS / 38BH

U

A

Q

L

R

I

T

E

Y

T

S

I

G

E

R

S

'

D

Y

O

A

S

S

U

R

A

N

C

E

L

L

•

I

S

1

O

0

9

0

INSTALLATION MANUAL

R-410A

38BC / 38BH

R-410A

Cooling only and heat pump split system outdoor units

For operation and maintenance instructions of this unit as well as installation
instructions of the indoor unit, refer to the relevant manuals.

Contents

Page

Dimensions and weight ................................................................................................................. 2

Connections................................................................................................................................... 2

Minimum clearances...................................................................................................................... 3

Operating limits .............................................................................................................................. 3

System charge............................................................................................................................... 3

General information....................................................................................................................... 4

Warnings: a void............................................................................................................................. 5

Refrigerant connections ................................................................................................................ 6/8

Electrical connections ................................................................................................................... 9/10

Electrical data................................................................................................................................ 10

Pump down and check the refrigerant charge............................................................................... 11

Maintenance .................................................................................................................................. 12

Troubleshooting ............................................................................................................................. 12

Guide for the owner and accessories ............................................................................................ 12

Installation instructions supplement.............................................................................................. 13

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 ser vicing

equipment and replacement components are designed to operate with R-410A.

•R-410A refrigerant cylinders are pink.

• R-410A refrigerant cylinders have a dip tube which allows liquid to flow out with the cylinder in a vertical

position with the valve at the top.

•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 it enters in the unit.

•R-410A, as other HFCs, is only compatible with oils selected by the compressor manufacturer.

•A vacuum pump is not enough to remove moisture from oil.

•Oils absorb moisture rapidly. Do not expose oil to atmosphere.

•Never open system to atmosphere while it is under vacuum.

•When the system must be opened for service, break vacuum with dry nitrogen.

•Do not vent R-410A into the atmosphere.

•Use only Carrier matching indoor units (Table I).

Unit size Oil type Quantity cc

07 PVE 440
09 PVE 500
12 PVE 670
14 PVE 670

ENGLISH

Table I

Cooling only Heat pump Hi-Wall

models models “42PHW/PHQ” series

(A/C) (H/P) A/C H/P

38BC-007G 38BH-007G 007 007 007 —
38BC-009G 38BH-009G 009 009 009 009
38BC-012G 38BH-012G 012 012 012 012

38BC-014G 38BH-014G 014 014 014 014 230V ~ 50Hz
38BCS009G — 009 — 009 009
38BCS012G — 012 — 012 012
38BCS014G — 014 — 014 014

Hi-Wall Console Power

“42HMC” series “42VMC” series supply

GB - 1

38BC / 38BH

R-410A

Dimensions and weight

A

B

C

Connections

DEE

Ø 8,3

햳

Mod.

38BC 38BH

07- 09 - 12 - 14 07- 09 - 12 - 14
A mm 750 750
B mm 590 590
C mm 280 280

8,3

13,3

D mm 470 470
E mm 140 140

F mm 310 310

kg 26,5 - 30 - 33 - 35 28,5 - 33 - 36 - 37

F

햲

햴

햲

햲 Outdoor unit
햳 Indoor unit
햴 Height difference

Table II: Connections

Model 007 009 012 014

Max. height difference 5 m 5 m 5 m 8 m

Max. pipe length 15 m 15 m 15 m 15 m

Pipe diameter Pipe diameter

Model Gas Liquid Gas Liquid

(Suction) (Liquid) (Suction) (Liquid)

mm inches

07
09

12
14

9,52 6,35 3/8” 1/4”

12,70 6,35 1/2” 1/4”

햴

햳

Minimum nominal thickness

Pipe diameter Minimum nominal thickness

inches - mm (mm)

1/4” - 6,35 0,80
3/8” - 9,52 0,80

1/2” - 12,70 0,80

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.

GB - 2

38BC / 38BH

R-410A

Minimum clearances

B

A

F

A

C

Model 007-009-012-014

A mm 50
B mm 100
C mm 400
D mm 50
E mm 300
F mm 400

ENGLISH

D

E

DE

F

T able III: Operating limits

Cooling (2)

Heating (3)

Mains power supply Nominal single-phase voltage 230V ~ 50Hz

Notes: 1. Data referred to the outdoor unit only.

2. According to ISO 5151.2/T1.

3. According to ISO 5151.2/High+.

4. Units 38BCS 012 and 014 are provided with head pressure
control suitable up to –10°C ambient temperature
(38BCS009 up to –5°C).

d.b. - dry bulb; w.b. - wet bulb

(1)

Maximum conditions

Minimum conditions

Maximum conditions

Minimum conditions outdoor temperature –10°C d.b.

Operating voltage limits min. 198V – max. 264V

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.

outdoor temperature 43°C
indoor temperature 32°C d.b.; 23°C w.b.
outdoor temperature 15°C
indoor temperature 21°C d.b.; 15°C w.b.
outdoor temperature 24°C d.b.; 18°C w.b.
indoor temperature 27°C d.b.

(4)

System charge

Size

Cooling only 007 630 10 25 –
Cooling only 009 660 10 25 –
Cooling only 012 730 10 25 –
Cooling only 014 980 10 25 100
Heat pump 007 630 10 25 –
Heat pump 009 820 10 25 –
Heat pump 012 940 10 25 –
Heat pump 014 920 10 25 150

Refrigerant Suitable up to Extra charge Extra charge (g)

charge (g) m g/m with indoor unit 42VMC

GB - 3

38BC / 38BH

6

R-410A

General information

Unit installation

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 electro­magnetic compatibility (EEC/89/336) directives.

• Check that the impedance of the mains power supply is in
conformance with the unit power input indicated in the
electric data table IV, on page 10 (EN 61000-3-11).

• 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 mains 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 mains supply circuit.

• The mains supply must be connected as follows:

Models 38BC and 38BH: to the indoor unit.
Models 38BCS: 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.

• 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 mains 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 the ozone 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 refrigerant 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.

• 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 equipment.

Choosing the installation site

Positions to avoid:

• Exposed to direct sun.

• Too close to sources of heat radiation, vapour or flammable gas.

• Particularly dusty areas.

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.

470

mm

• Fix the unit with locally purchased bolts buried in the block to
prevent overturning due to strong gusts of wind.

햳

• For heat pump models, unit must be adequately raised above

floor surface.

햶

햵

• To empty the condensate water to a drain while operating in

heating mode, insert the drain fitting into the hole underneath on
the centre of the base and use a vinyl pipe with a 16 mm inside
diameter. It must not be used at temperatures below 0

available for low temperature versions).

• 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.



mm

310

 No. 4 Ø 8 mm pins.
 Protrusion height from the

support surface max. 6 mm.

햲

햲 100 mm min.

햴

햵 Drain fitting
햶 Vinyl pipe

햳 20 mm gradient.
햴 Gravel-filled trench.

Snow

°C (not

GB - 4

38BC / 38BH

R-410A

Warnings: av oid....

Disconnecting the refrigerant connections after installation:
this will cause refrigerant leaks. Loosening the liquid line connection
may cause the loss of the expansion device.
Connecting the condensate drain pipe to the outdoor unit.

ENGLISH

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.

Multiple unit installation with units facing each other.

Insulating the connecting pipes only partially, which will cause dripping.
Dripping into passageways.

Unnecessary turns and bends in the connecting pipes.

Any slack in the electrical connections.

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

38BC / 38BH

R-410A

Refrigerant connections

No moisture.
No dust.

Charge liquid-no gas.

No leak.
No mineral oil.

Neat.

Copper tubes during storage.

1/2” UNF (R-410A)

7/16” UNF (R-22)

Use tools designed for R-410A higher pressure.
Keep inside clean.

Dry nitrogen brazing.

Vacuum.

GB - 6

Min.

– 100 kPa

(– 755 mmHg)

2-stage vacuum pump. Replace oil regularly.

38BC / 38BH

R-410A

햴

Refrigerant connections

Flaring the ends of the tubing

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.

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.

Remove flare nuts from the unit connections and place them on the
tube end.
Flare the tube with the flaring tool.

ENGLISH

Where required, the unit must be charged with additional
refrigerant.
Additional charge must be added using electronic scales and
the service port (1/2") on the suction line (gas).

Charge refrigerant only in liquid phase (see page 1).

IMPORTANT:
Open the three way valves only after having completed the
pipe connections and evacuation.

L

Flare end must not have any burrs or imperfections.
The length of the flared walls must be uniform.

L

햳

햲

The unit can be installed:

햲 on the floor;
햳 on the wall using the bracket kit.

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.

Connection to unit

햴 Adjustable wrench

or torque wrench

Insufficient tightening torque will cause gas leaks.
Overtightening the fittings will damage the tube flaring and
cause gas leaks.

Pipe diameter Tightening torque

Nm

6.35 mm (1/4”)18

9.52 mm (3/8”)42

12.70 mm (1/2”)55

Tightening torque

Valve

1/4” 22 18 23 20 18 16 - 18 Allen (hex.) 5 9 – 0.34
3/8” 22 42 23 20 18 16 - 18 Allen (hex.) 5 9 – 0.34
1/2” 26 55 29 40 18 16 - 18 Allen (hex.) 5 13 – 0.34

Flare nut Valve cap Pressure port cap Valve needle Pressure port

Wrench mm Nm Wrench mm Nm Wrench mm Nm Wrench mm Nm Wrench mm Nm

GB - 7

38BC / 38BH

R-410A

Refrigerant connections

햹

햷

햸

햶

햴

햵

햺

햳

햴

햹

햻

햲

햺

햾

햲 Three-way valve (gas)
햳 Needle valve
햴 Valve cap
햵 Valve needle
햶 Allen (hex. head) wrench
햷 Three-way valve (liquid)
햸 Flare nut
햹 Liquid line (small diameter)
햺 Gas line (large diameter)
햻 Indoor unit
햽 Outdoor unit
햾 Vacuum pump

Air purging

Use only a vacuum pump to purge air from the piping.

NEVER use the system compressor as a vacuum pump.
NEVER use the unit refrigerant gas to purge the connecting

pipes.

No additional refrigerant has been provided in the unit for this
purpose.

햽

헁

햿

Remove the caps from the three-way valves.
Create a vacuum with a vacuum pump connected to the service
connection of the suction shut-off valve (gas), as shown, keeping
the shut-off valves completely shut until a 50 Pa (0.5 mbar)
vacuum has been reached.
Now open the liquid valve for 3 seconds, then quickly shut it to
check for possible leaks.
After the leak check, fully open the three-way valves.
Replace caps and check for leaks.

Once all connections have been completed, check for leaks by
using a leak detector specific for HFC refrigerants.

GB - 8

헀

햿 Pipe
헀 Pipe insulation
헁 Fastening tape

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.

38BC / 38BH

LYON

W

2

쐃

쐇

YON

W

2

230V ~ 50Hz

쐋

쐏

N

R-410A

Electrical connections

38BC- 007 - 009 - 012 - 014

Cooling only Cooling only

unit system

NY

햳

NY

230V ~ 50Hz

쐏

쐋

햲

쐃

LYN

쐇

ENGLISH

38BH- 007 - 009 - 012 - 014

Heat pump Heat pump

unit system

NYOW2

N

NYOW2

YN

햲

햳

Terminal box legend

Earth.

L Live power supply.
N Neutral power supply.
R Live connection indoor/outdoor unit.
C Neutral connection indoor/outdoor unit.
Y Compressor interlocking contact.
O Reversing valve control (Heat pump only).
W2 Outdoor fan signal (Heat pump only).

38BCS 007 - 009 - 012 - 014

Cooling only unit Cooling only system

LYCRN

LYCRN

10

10

120

100

햳

햲

햲 Connecting cable, indoor-outdoor units

(field wiring).

햳 Mains supply connecting cable

(field wiring).

쐃 Indoor unit
쐇 Outdoor unit
쐋 Main switch
쐏 Time-delay fuse or circuit breaker

(see table IV "Electrical data").

쐃

LYN

N

쐋

쐏

햳햲

230V ~ 50Hz

RLCYN

쐇

GB - 9

38BC / 38BH

R-410A

Electrical connections

The mains supply must be connected as follows:
Models 38BC and 38BH: to the indoor unit.
Models 38BCS: to the outdoor unit.

• Open control box panel (valve cover panel).

• Make electrical connections between units prior to proceeding
to mains supply unit connection.

• Connect the wires to the terminals according to the wiring
diagram and firmly tighten.

• Before proceeding with the unit connection to the mains supply
locate live L and neutral N, then make connections as shown
in the wiring diagram.

• Check that the impedance of the mains power supply is in
conformance with the unit power input indicated on the electric
data table IV.

• Ensure that mains supply connection is made through a switch
that disconnects all poles, with contact gap of a least 3 mm.

• The indoor - outdoor unit interconnecting wires must be A07 RN-F
type (245 IEC 57) or higher, with synthetic rubber insulation with
Neoprene coating, according to EN 60335-2-40 codes.

• The mains supply connecting cable for 38BCS units, must be
H07 RN-F type (245 IEC 57) or higher, with synthetic rubber
insulation with Neoprene coating, according to EN 60335-2-40
codes.

• Make refrigerant connections before electrical
connections.

When disconnecting, disconnect electrical connections before
refrigerant connections.

IMPORTANT:
Make ground connection prior to any other electrical
connections.

Notes:

1. Refer to the indoor unit installation manual for sizing of
the power supply wires.

2. All field electrical connections are the responsibility of the
installer.

3. After connections have been completed, replace control
box panel.

Table IV: Electrical data

Power input

Starting

current

(3)

Cooling only A A W A W A W A W A mm

38BC 007 17 3.3 740 4.0 810 --- --- --- --- 10 1.5 1.5

38BC 009 24 4.0 890 5.2 1035 --- --- --- --- 12 1.5 1.5

38BC 012 28 5.4 1160 8.4 1625 --- --- --- --- 16 2.5 2.5

38BC 014 36.5 6.7 1480 9.4 1870 --- --- --- --- 20 2.5 2.5

38BCS 009 24 4.0 890 5.2 1035 --- --- --- --- 12 1.5 1.5

38BCS 012 28 5.4 1160 8.4 1625 --- --- --- --- 16 2.5 1.5

38BCS 014 36.5 6.7 1480 9.4 1870 --- --- --- --- 20 2.5 1.5

Heat pump A A W A W A W A W A mm

38BH-007 17 3.4 730 4.8 920 2.9 650 4.7 920 10 1.5 1.5

38BH-009 24 3.7 810 4.7 920 3.8 820 5.9 1160 12 1.5 1.5

38BH-012 28 4.9 1080 7.1 1370 5.1 1110 8.3 1590 16 2.5 2.5

38BH-014 36.5 6.8 1470 9.4 1860 6.3 1420 9.3 1840 20 2.5 2.5

Nominal conditions

230V ~ 50Hz
ISO 5151.2/T1

indoor 27°C d.b. 19°C w.b.

outdoor 35°C d.b. 24°C w.b.

Cooling

Peak conditions

198V ~ 50Hz
ISO 5151.2/T1

indoor 32°C d.b. 23°C w.b.

outdoor 43°C d.b. 32°C w.b.

(2)

Heating

Nominal conditions

230V ~ 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

198V ~ 50Hz

ISO 5151.2/High+

indoor 27°C

outdoor 24°C d.b. 18°C w.b.

Main power

connections

Time-delay

fuse

gL type

(7)

Wire size

(4-5)

2

2

Indoor-

outdoor

unit

Wire size

(4-5-6)

2

mm

2

mm

Notes: 1. Unit is suitable for outdoor installation.

2. Data referred to the outdoor unit only.

3. Starting current duration is usually lower than 1 sec.

4. Wire size shown applies to line length up to 15 m.

5. If the indoor unit is provided with an electric heater, consult indoor unit installation manual for correct sizing of the wires.

6. The indoor - outdoor unit interconnecting wires must be A07 RN-F type (245 IEC 57) or higher, with synthetic rubber insulation with Neoprene

coating, according to EN 60335-2-40 codes.

7. The mains supply connecting cable for 38BCS units must be H07 RN-F type (245 IEC 57) or higher, with synthetic rubber insulation with
Neoprene coating, according to EN 60335-2-40 codes.

GB - 10

38BC / 38BH

R-410A

Pump Down and chec k the refrigerant charge

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.

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.

• R-410A refrigerant cylinders contain a dip tube which allows
liquid refrigerant to flow out with the cylinder in a vertical
position with the valve at the top.
Charge R-410A units with the cylinder in a vertical position
and a commercial-type metering device in the manifold hose
in order to vaporize the liquid refrigerant before it enters in
the unit.
Charge refrigerant into the suction-line.

ENGLISH

1

4

Legend:

햲 Outdoor coil
햳 Compressor
햴 Metering device
햵 Strainer
햶 Vapor valve
햷 Liquid valve
햸 Service pressure port
햹 Indoor unit coil
햺 Liquid distributor
햻 Cooling metering device
햽 Heating metering device
햾 Additional suction

accumulator

Heat pump unitCooling only unit

13

5

7

5

7

9

8

1

12

2

14

3

6

햿 Reversing valve
헀 Crankcase heater

(for 38BCS units only)

헁 Discharge muffler

Gas

Liquid + Gas

Liquid

1

15

8

12

2

4

11

10

6

Cooling cycle

13

5

7

9

15

8

12

2

4

11

10

6

Heating cycle

GB - 11

38BC / 38BH

R-410A

Maintenance, tr oubleshooting, guide for the owner and accessories

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:

Switch the mains supply OFF.

Remove unit front panel complete with top cover by loosening
holding screws and lifting as shown.
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 front panel with cover and tighten the screws.

Troubleshooting

Compressor and fan of the outdoor unit will not start:

• Unit not energized; check the mains 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.

• Mains 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; 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.

• Mains 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.

Frequent ice build-up on outdoor coil (during heating with
heat pump units):

• Outdoor fan stopped; check cause and repair.

Discharge pressure too high:

• 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.

Discharge pressure too low:

• Refrigerant charge too low; add refrigerant.

• Outdoor coil dirty or obstructed; clean or remove obstructions.

• Indoor unit air filter dirty; clean filter.

Suction pressure too high:

• Refrigerant charge too high; drain some refrigerant (see note 1).

• Reversing valve (on heat pump models) faulty or internal leak;

replace.

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.

Outdoor fan cycling due to its overtemperature protection:

• Fan capacitor faulty; replace.

• Electrical connection loose; check connections.

• Fan motor burnt out; replace.

• Fan bearing seized; check and repair.

• Expansion device clogged or covered with ice; drain refrigerant

(see note 1), evacuate and recharge.

• Expansion device clogged or covered with ice; drain refrigerant
(see note 1), evacuate and recharge.

Note 1:
Do not release refrigerant to the atmosphere; use
refrigerant recovery equipment.

Guide for the owner

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.

• Removal and cleaning of the air filters.

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.

T able V : Accessories

Description Part number 38BC 38BH 38BCS

007 009 012 014 007 009 012 014 007 009 012 014

Wall bracket kit 38BH9001 앬앬앬앬앬앬앬앬앬앬앬앬

GB - 12

38BCS...G

Installation instructions supplement

ENGLISH

Cooling only

쐃쐇

햷

햴햷햸햵

38BCS…G units are designed to work in North European climates.
These versions are identified on the 5th digit, "S" of their code

number.
R-410A versions are identified on the 8th digit “G” of their code

number.
They differ from the standard ones for the following factory fitted

accessories: head pressure controller (HPC), loss of refrigerant
pressure switch (LRPS) and high pressure cut-out.

햶

쐃 Outdoor unit
쐇 Indoor unit
햴 Head pressure sensor
햵 Loss of refrigerant

pressure switch

햶 High pressure cut-out
햷 Pressure service por t
햸 Anti freeze thermostat

Operating range

Minimum ambient temperature:

min. –5°C max. +43°C (mod. 009)
min. –10°C max. +43°C (mod. 012, 014)

Power supply

Nominal single-phase voltage: 230V ~ 50Hz
Operating voltage limits min. 198V

max. 264V

Features

– HPC and HIP Remote Manual Reset.

The head pressure controller allows operation in cooling
mode up to –5°C (mod. 009) and –10°C (mod. 012,

014) ambient temperature keeping the condensing
temperature always above 41°C - 42°C.

wiring from temperature sensor to printed circuit board

Head pressure controller:

SENSOR

SENSOR

SENSOR

CONTROL

N. OUT

NEUTRAL

OUT

LINE OUT

LINE IN

NEUTRAL

IN

HP SELECT

Head pressure controller and HIP remote
manual reset

Configuration

The Head Pressure Control “HPC” is made of two parts:

• Printed circuit board, with electronic components and quick
connector terminals.

• Temperature sensor, complete with 500 mm wiring.

For the user convenience “HIP” has been selected at automatic reset.
If “HIP” trips, cycle the pow er supply OFF and ON to reset the system,
because the electrical box is equipped with relais that prevent the unit
from starting, till the indoor control is switched OFF.
When head pressure drops below 3000 kPa (30 bar; 420 psig) it is
possible to restart the unit switching the indoor control ON.

Operations mode

Full voltage:

When the liquid line temperature is over the setpoint value plus half
proportional band (factory set by supplier), the output voltage to the
motor is 97% or more of supply voltage.

Low voltage:

When the liquid line temperature is below set point minus half
proportional band, the output voltage to the motor is fixed to 95V.

Hard start:

At each compressor starting the full voltage output to the fan motor
is provided for 3 seconds.

Proportional band:

The controller directly senses the changes in liquid line temperature
and varies the output voltage which causes the fan motor speed
increase or decrease.

– LRPS Loss of refrigerant pressure switch: brazed between

outdoor coil and expansion device. When unit is
working, the pressure “high side” drops below 345kPa
(3.45 bar; 50 psig) for refrigerant losses, the
compressor cannot restart.

Set point

– open at 345 kPa (3.45 bar; 50 psig) pressure
– close at 650 kPa (6.5 bar; 95 psig) pressure

Temperature setting

Proportional band set point +11 / –11°C
Minimum speed output voltage: 95V
Setting: the head pressure controller is

supplied factory set at 42°C

Hard start time 3 seconds.

Note:

In case of first start after a pause of several hours at –10°C, with
low voltage supply (198V) high pressure switch HIP may trip off the
unit. In this case, the remote reset by indoor control (infrared) can
be done for unit restarting.

GB - 13

L010125H19 - 0502

Via R. Sanzio, 9 - 20058 Villasanta (MI) Italy - Tel. [phone]

The manufacturer reserves the right to change any product specifications without notice.

Order No. 13851-74M10, May 2002. Supersedes Order No. 13851-74M10, April 2002. Printed in Italy