Electra LS 35, LS 40, LS 55, LS 65, LS 85 Installation Instructions Manual
CENTRAL AIR CONDITIONER
SPLIT SYSTEM
WITH ELECTRONIC CONTROL
SERIES LS
INSTALLATION INSTRUCTIONS
SUMMARY
GENERAL.......................................................................................................................................................... 1
SELECTING THE LOCATION OF UNITS......................................................................................................... 3
RELATIVE LOCATION OF THE UNITS............................................................................................................ 3
SELECTING THE OUTDOOR UNIT (CONDENSER) LOCATION ................................................................... 3
SELECTING THE INDOOR UNIT (EVAPORATOR) LOCATION ..................................................................... 4
INSTALLATION OF THE INDOOR UNIT (THE EVAPORATOR) ..................................................................... 5
INSTALLATION OF THE INDOOR UNIT.......................................................................................................... 5
CONDENSATE DRAIN PIPING OF THE INDOOR UNIT................................................................................. 6
OUTDOOR UNIT INSTALLATION .................................................................................................................... 7
CONNECTION OF REFRIGERANT TUBING BETWEEN INDOOR AND OUTDOOR UNITS ........................ 8
GENERAL ......................................................................................................................................................... 8
RECOMMENDATIONS FOR REFRIGERANT TUBING INSTALLATION ........................................................ 9
SETTING IN OPERATION ................................................................................................................................ 9
FLARE PREPARATION .................................................................................................................................. 10
CONNECTING THE TUBES ........................................................................................................................... 10
EVACUATION AND SETTING IN OPERATION ............................................................................................. 10
ELECTRICAL CONNECTIONS....................................................................................................................... 12
POWER SUPPLY ............................................................................................................................................ 12
INTERCONNECTING CABLE......................................................................................................................... 14
DISPLAY CONTROL UNIT ............................................................................................................................. 15
LOCATION CRITERIA .................................................................................................................................... 15
INSTALLATION OF DISPLAY CONTROL UNIT ON WALL ........................................................................... 15
CONSIDERATIONS IN LOCATING THE REMOTE-CONTROLLER ............................................................. 15
REMOTE-CONTROLLER MOUNTING.................................................................................................... ....... 16
LS REMOTE CONTROL (OPTIONAL) ........................................................................................................... 16
FINAL TASKS.................................................................................................................................................. 17
English 1
1. GENERAL
The installation instructions relate to LS air-conditioners. LS air-conditioners are made up of two units: an
indoor unit (evaporator) and an outdoor unit (condenser). The two units are interconnected by two refrigerant
tubes, an electric cable and a control cable.
Below are recommendations for correct installation of apartment air-conditioner systems:
• Evaluate the building’s heat absorption.
• Choose the shortest route for the refrigerant lines, with minimum bends.
• A 0.3% loss of efficiency for each meter of tubing beyond the first 7.5 meters should be taken into
account.
• Check the return air route from the air-conditioned area through the return air grille to the inlet grille
of the indoor unit. The route must be free of obstruction and must not pass through non airconditioned areas.
• On a second level of homes (with two levels) the return air grille will be installed close to the floor
and with verification of air outlet from the rooms.
• Use air manifold and return air grilles of a correct size, in conformity with the company's
recommendations.
• In systems with articulated air ducts:
− Articulated ducts of a correct diameter, following the shortest and straightest possible routes
without bends.
− Use of deep adapters only (at least 220 mm) for connecting air ducts and grilles.
ATTENTION
!
Frequent problems in installations are presented below. In order to avoid them, relate to them prior to the
planned installation:
A. Lack of suitable ducts for air return. Air exchange through an open door - a bad solution!
B. No access to air filters and the electrical component box.
C. There are openings and passages to unconditioned floors, or even open to outside air.
D. Air circulation between rooms.
E. Use of incorrect air distributors. The injection and distribution cannot be properly directed.
F. De-icing thermostat does not work, telephone cable was not installed between the outdoor unit and the
indoor unit.
G. Noise in the ducts, when there is no sound insulation inside the ducts.
H. Absence of fresh air influx in a public place.
I. Feeling of discomfort in a office having internal areas and rooms with outside looking windows both
connected to the same unit.
J. Units installed in high places may not provide sufficient heating on a cold day. Installation of an auxiliary
heating element is recommended. This is extremely important in units that operate at night. (An optional
heating element kit can be ordered from the factory).
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LS Indoor Unit (Evaporator)
1. Flare coupling
2. Fresh air intake Ø 100 and Ø 125
3. Filter
4. Electrical component box 250x190x70
5. Condensate Drain Port
6. Air inlet
7. Air outlet
LS Outdoor Unit (Condenser)
1. Electric connections
2. Suction line connection (flare)
3. Air inlet
4. Service cocks
5. Liquid line connection (flare)
6. Air outlet
Dimensions (mm) LS 35 LS 35-35 LS 40 LS 55 LS 65 LS 85
A 795 845 795 845 845 900
B 610 690 610 690 690 860
C 315 370 315 370 370 380
D 500 545 500 545 545 706
E 265 300 265 300 300 333
F 270 350 270 350 350 450
G 148 152 148 152 152 98
H 290 300 290 300 300 340
I 293 330 293 330 330 357
Figure 1: LS models, general dimensions
LS 35/40/55
LS 65/85
English 3
2. SELECTING THE LOCATION OF UNITS
Only trained and qualified service personnel recommended by the company should install the air conditioner,
in pursuance of the company specifications and using pipes, wiring, and the standard installation
accessories of the company. Any service call, maintenance or repair carried out by the company on
equipment that was installed in noncompliance with the company's instructions will require payment.
In selecting the location of the units, the following requirements should be taken into account:
2.1 Relative location of the units
Install the outdoor unit (condenser) and the indoor unit (evaporator) as close as possible to each other.
For determining the maximum permitted distance between them, see page 8. If it is necessary to
exceed this distance, consult the company.
2.2 Selecting the outdoor unit (condenser) location
• Allow sufficient space for servicing and air flow around the unit.
• Avoid the unit’s exposure to direct sunlight.
• Select a place for the unit that will cause minimum disturbance and/or inconvenience to the user
and the neighbors.
• A minimum of 200 mm is required between the unit and any wall.
• When installing in an enclosed space (balcony, laundry room etc.), make sure that there are vents
ensuring the release of the warm air outside and preventing its return into the outdoor unit.
• In the case of several outdoor units installed in a group, make sure that the warm air discharged by
one outdoor unit is not directed toward another outdoor unit.
• Make sure that the wall on which the outdoor unit is to be installed has a minimum thickness of 200
mm and is strong enough to support the weight of the unit. Do not install on a light structure that is
not resonance vibration-proof (for instance I-tung).
• When the outdoor unit is installed below the level of the indoor unit, ensure that the height
difference between the units is as explained on page 8.
• When installing on the balcony of a second floor or higher, make sure that the level of the upper
housing of the outdoor unit is at the height of the railing. If the outdoor unit is nonetheless installed
lower, ensure that it is installed in a way that will allow easy access and possibility of removing the
cover when servicing the unit.
• When the outdoor unit is installed in an alcove or in a place without free access, install tubing
longer than that usually required, with several loops, to allow for moving the unit when servicing.
• Take into account that water dripping occurs during the heating operation. If it disturbs neighbors,
ensure drainage.
• It is recommended not to hang outdoor units on bedroom walls.
• Do not install outdoor units on tile and asbestos roofs.
English 4
2.3 Selecting the indoor unit (evaporator) location
Take into account the following requirements when selecting the place of the indoor unit:
• Allow maximum air diffusion, to as great as possible a distance within the space to be airconditioned.
• Allow free passage for the return air coming into the air-conditioner.
• Ensure adequate drainage of condensation water produced inside the unit.
• Ensure maximum quiet near the bedrooms.
• A minimum of 150 mm is required between the filter and the nearby wall.
• Easy access to the electrical component box and other parts of the indoor unit for servicing.
• Lower ceiling at least 70 mm under the bottom of the unit.
English 5
3. INSTALLATION OF THE INDOOR UNIT (THE EVAPORATOR)
3.1 Installation of the indoor unit (see fig. 2)
A. The indoor unit is designed for installation inside the building in a place not exposed to outdoor
conditions.
B. When it is necessary to install the unit outside the building or in a roof space, take the following
steps:
• Protect the unit from damp and from heat radiation and provide it with additional glass wool
external thermal insulation with 1" thick aluminum coating.
• Plan as short as possible a return air duct with two arcs at most; the duct opening at its
connection to the unit must be of the same size as the backside of the unit.
• In order to reduce noise from vibrations, avoid rigid contact of the unit with the building’s structure
by using suitable shock absorbers and flexible sleeves between the units and the ducts.
• The return air grille must be as close as possible to the air suction side
50
A=30 max
1
2
3
5
6
4
1. Concrete ceiling
2. 8 mm max rod
3. Rubber shock absorber
4. Washer
5. Nut
6. Tightening nut
Figure 2: Installation of indoor unit on ceiling
Plan in advance an easy access to the unit for servicing:
The unit is accessible for servicing from its bottom only.
• Allow a minimum of 150 mm between the wall and the air filters.
• Height of the space required for installation is 80 mm minimum under the unit.
• Access for servicing to all the bottom area of the unit to the size of the service panel.
• Seal the space in which the unit is installed in order to prevent penetration of unconditioned air into
the return air. Also insulate with thermal insulation every partition bordering on an area that is not airconditioned.
1. Vibration absorbers
2. Return air intake
3. Air-conditioned air outlet
4. Opening for removing air filters
5. Control access aperture at the bottom of the unit
6. False ceiling in the access area for servicing
Attention!
A possibility must be left for
reaching all the bottom area
of the unit for servicing.
150 mm min.
80 mm min.
1
2
3
4 5
6
Figure 3: Installation of indoor unit
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3.2 Condensate drain piping of the indoor unit
• It is recommended to have a professional plumber prepare a
drain outlet having a 32 mm diameter rigid PVC tube near the
indoor unit, to which a flexible drain pipe for the drainage of the
indoor unit can be attached.
• Install a siphon on the drain line near the unit as portrayed in
fig. no. 4.
• Plan in advance the path of the drain line with a downward
slope of at least 2% and a water trap (siphon) on the line in
order to prevent intake of air through the tube into the unit and
to facilitate the evacuation of condensate water from the unit.
• The rigid drain tube end must be 50 mm lower than the bottom
of the unit.
Figure 4: Siphon on the drain
line
English 7
4. OUTDOOR UNIT INSTALLATION
Installation on flat surface (roof, ground, etc.)
The outdoor unit should be elevated at least 100 mm above the ground by using concrete pad, concrete
blocks or wooden beams, in order to allow free flow of condensate water (See Figure 5).
1500 mm
200 mm
Min
Min
Figure 5: Outdoor Unit Installation Criteria
1. Outside the building
2. Outdoor Unit
3. Serrated Rubber 40x80 mm
4. Floor
5. Concrete base or floor tiles
6. Anchor bolts
7. Wall
English 8
5. CONNECTION OF REFRIGERANT TUBING BETWEEN INDOOR AND
OUTDOOR UNITS
5.1 General (See Figure 6)
The indoor and outdoor units are
connected by two copper tubes and
an electric cable, all passed through a
60-mm wall opening. In addition, a
drainage hose connects the indoor
unit with the nearest drain system.
Connect both units taking the shortest,
most direct route.
1. To outdoor unit
2. Connecting tubing
3. Electric cable
4. Inclination angle
5. To indoor unit
Figure 6: Connection of tubing
and cable
WARNING!
When laying the tubing for the installation, make sure that the ends are sealed to prevent penetration of dirt,
moisture etc. To prevent dust or moisture from entering the tubes, seal them with caps or masking tape. It is
recommended to clean the inside space of the tubes with nitrogen before connecting them to the unit.
Whenever possible, avoid passing tubes through hot zones, such as walls next to ovens, chimneys, etc.
When not possible to avoid this, additional insulation or other means of protection should be provided.
Route the tubing as straight as possible. Keep the number of tube bends to a minimum. If bends are
necessary, perform them only by using professional tube benders and not manually.
Make sure that tubing is insulated on its entire length, including tube ends and quick-attach couplings, or
flared nuts, to avoid tube “sweating” and water dripping from it.
Tubing must be of the “L” type, without any damage. Tubes’ inner walls must be kept absolutely clean prior
to and during installation operations.
Each tube must be individually insulated as follows: tubes up to 5/8” O. D. with 6 mm wall thick sleeve;
above 3/4” O. D. with 9 mm wall thick sleeve.
For diameters, length of liquid and suction lines, and height difference, see Table No. 1 for each model. If the
liquid or suction tube diameters differ from the corresponding flared nuts (mounted on the unit’s branch
pipes) diameter, use a suitable adapter (it is forbidden to insert a tube into another tube) between the flare
connection and the unit’s branch pipes.
TUBING LENGTH, UP TO - (IN METERS) UNIT MODEL REFRIGERANT
LINE
12 16 20 30
MAX HEIGHT
DIFFERENCE
LS 35 Suction
Liquid
1/2”
1/4”
- - - 7
LS 40 Suction
Liquid
1/2”
1/4”
1/2”
1/4”
- - 7
LS 55 Suction
Liquid
5/8”
3/8”
5/8”
3/8”
5/8”
3/8”
- 10
LS 65 Suction
Liquid
5/8”
3/8”
5/8”
3/8”
5/8”
3/8”
- 10
LS 85 Suction
Liquid
5/8”
3/8”
5/8”
3/8”
5/8”
3/8”
5/8”
3/8”
10
Table No. 1
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5.2 Recommendations for refrigerant tubing installation
There are three possible variants, a shown on the diagrams:
1. The outdoor unit is installed above the indoor unit (Figure 7) - such installation requires an oil trap
in the suction line at the lowest point of the riser. The radius of the oil trap should be as short as
possible (see Figure 8). Horizontal runs of the suction line should have a 0.5% minimum pitch
toward the outdoor unit. The liquid line should parallel the suction line (except for the oil trap). In
case the tubing insulation had to be partially removed for installation purposes, it is imperative
that the lines be fully insulated with Armaflex, or equivalent insulation, after installation has been
completed.
1. Air inlet
2. Air outlet
3. Suction Line
4. Oil trap every 5 m
5. Liquid Line
6. Indoor unit
Figure 7: Connection of refrigerant tubing-
Outdoor Unit above Indoor Unit
Figure 8: Tube Bending
2. The outdoor unit is installed below the indoor unit (Figure 9) - no trap is required in such
installation. Besides it, the same applies as above.
3. The units are installed at the same level (Figure 10) - no trap is required in such installation.
Besides it, the same applies as above.
1. Air outlet
2. Outdoor Unit
3. Liquid Line
4. Suction Line
5. Indoor Unit
1. Air outlet
2. Outdoor Unit
3. Suction Line
4. Liquid Line
5. Indoor Unit
Figure 9: Connection of refrigerant tubing -
Outdoor Unit below Indoor Unit
Figure 10: Connection of refrigerant tubing -
Outdoor Unit and Indoor Unit at the same level
5.3 Setting in Operation
WARNING
This paragraph describes the necessary steps for setting the unit into operation; be sure to follow the
instructions, to assure proper functioning of the air-conditioner.
The outdoor unit is charged with the correct amount of refrigerant. In extended runs, for additional
refrigerant charge please refer to the outdoor unit nameplate. This operation shall be performed only
by qualified refrigeration technicians with a professional charging set.
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5.3.1 Flare preparation
a) Cut the tube, using a tube cutter. Make sure that the cut
is perpendicular to the tube axis and free of burrs (see
Figure 11).
b) Slip the flared nut over the tube, secure the tube in the
flaring tool, as shown in Figure 12 and perform the flare
on the tube end. The tube projection length (A) from the
flaring block varies with tube diameter and shall be set as
indicated in the table. Apply few drops of refrigeration oil
to the tube before flaring.
CORRECT
90º
INCORRECT
Figure 11: Tube cutting
5.3.2 Connecting the tubes (See Figure 13)
Connect and tighten the flare nuts to the refrigeration valves
on the outdoor unit and to the male connectors of the indoor
unit. Coat the flared surfaces lightly with refrigeration oil to
improve sealing.
Note: First tighten manually the flare nuts, and then use a
wrench. See Table No. 2 for tightening torque values.
A (mm)
TUBE OD
Figure 12: Tube flaring
1.3
1.6
1.9
2.1
3/8”
1/2”
5/8”
3/4”
1. Copper Tube
2. Flaring Tool
5.3.3 Evacuation and setting in operation
a) Take two charging hoses equipped with a pushpin on one side, as shown in Figure 13. Connect
the two hose ends without the push-pin to the LOW (suction) and HIGH (liquid) valves of the
charging set; remove the guard caps from the service ports of the tree-way suction and liquid
valves and connect the hose ends with the push-pins to the service ports (see Figure 14). On
units without service valve on the liquid port, connect only the hose to the suction 3-way valve.
b) Connect the center hose of the charging set to a vacuum pump.
c) Turn on the vacuum pump and make sure that the low pressure gauge reading moves
from 0 cm Hg to 76 cm Hg; then evacuate the system for 10 minutes.
If gauge needle does not move from 0 cm Hg to 76 cm Hg, this indicate a leak. In this case,
tighten all connections; if leaking stops after the tightening of tubing connections, proceed from
step c. If leaking persists even after the connections had been tighten, detect the leak and
repair it; be sure to proceed only after all leaks have been eliminated.
d) Close the valves of both the suction and liquid ports of the charging set and turn off the vacuum
pump. Make sure that the gauge needle does not move for about 5 minutes.
e) Disconnect the charging hoses from the vacuum pump and from the service ports of both the
tree-way valves.
f) Replace the service port and valve caps of both tree-way valves and tighten them with a torque
wrench; see table of torque values in table No. 2.
CAUTION
When performing the following steps, avoid any exposure to the service valve ports; remember that the
system is under pressure.
g) Remove the valve caps (1) from both valves; position both valves to “Open” using an hexagonal
wrench (See Figure 14).
h) Replace valve caps of both three-way valves. Check for gas leakage with a leak detector or
soapy water.
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