enervent LTR-3 Series Technical manual

LTR-3
PLANNING, INSTALLATION AND
OPERATION INSTRUCTIONS
Kipinätie 1, 06150 BORGÅ FINLAND
Phone [phone], fax [phone]
www.enervent.fi
2006_1

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Before you begin reading, confirm the model of your appliance.
These instructions cover the following models:
LTR-3- 85 LTR-3-120
LTR-3-85 E LTR-3-120 E
LTR-3-85 EP LTR-3-120 EP
____________________________________________________________
LTR-3-85 Fan efficiency 130 W
LTR-3-120 Fan efficiency 185 W
E Electrical heating coil 500 W (built-in), with thermostat.
EP Electrical heating coil 500 W (built-in), with Pulser regulator (cabling
required) and TG-K330 temperature sensor (cabling also required, see the
circuit diagrams at the end of the instruction).
E09KP-016 Electrical heating coil 900 W for installation in duct with Pulser regulator
(cabling required) and TG-K330 temperature sensor (cabling also required,
see the circuit diagrams at the end of the instruction).
E18KP-016 Electrical heating coil 1800 W for installation in duct with Pulser regulator
(cabling required) and TG-K330 temperature sensor (cabling also required,
see the circuit diagrams at the end of the instruction).
On all models the ducting connections are Ø 160 mm.
MODEL
EXPLANATION OF THE MARKS AND NUMBERS

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All LTR-3 ventilation equipment has been designed for all year round use. In Finland the
Enervent appliances have been installed in small premises and detached houses for over
20 years. The popularity of the appliances is increasing year by year. Using knowledge
gained over the years, it has been possible to make the LTR-3 range more and more user-
friendly.
The LTR-3 range is the result of long-term product development. It is very versatile and
variable.
With the help of this manual it is possible to install a appliance with basic functions
yourself. We recommend that installation of ventilation units with special functions and
extra equipment be carried out by a quilified electriction.
We recommend that a quilified ventilation engineer performs the installation work.
Before any maintenance of the appliance is carried out, please read the warning on the
next page!
Enervent Oy Ab admits a two (2) year product guarantee on the LTR-3 range. The
guarantee covers the repair work with the necessary spare parts. Repair service will be
carried out at the factory premises in Porvoo, Finland or as agreed.
The guarantee is not valid if the unit has been incorrectly installed, poorly maintained or
mechanical damage has resulted from improper use. This guarantee does not
compensate for losses indirectly caused by the use of the appliance, troubleshooting,
installation after the repair or transportation.
Retain the receipt as proof of purchase, and for the start date of the guarantee period.
INTRODUCTION
GUARANTEE

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MODEL page 2
INTRODUCTION 3
GUARANTEE 3
TABLE OF CONTENTS 4
WARNING 4
OPERATING PRINCIPLE 5
INSTALLATION PARTS 5
PLANNING OF THE DUCT SYSTEM 7
EXHAUST AIR CLASSIFICATION OF LIVING AREAS 9
PHASES OF INSTALLATION 10
INSTRUCTIONS FOR THE DUCT HEATER 11
INSTALLATION OF THE DUCT HEATER 12
MAINTENANCE OF THE DUCT HEATER 13
HEAT INSULATION OF AIR DUCTS 14
OPERATION 15
MAINTENANCE 16
BELT INSPECTION AND REPLACEMENT 16
AIR FLOW REFERENCE VALUES 18
KITCHEN VENTILATION 18
TO BE OBSERVED DURING OPERATION! 19
HEAT RECOVERY EFFICIENCY 19
CHARACTERISTICS 20
ELECTRICAL WIRING DIAGRAMS 22
SYSTEM PLANNING EXAMPLE 26
FAULT / CORRECTION GUIDE 27
DECLARATION OF CONFORMITY 29
TECHNICAL DATA 30
After opening the service hatch, wait for two (2) minutes before starting the maintenance
work! Although the unit’s power supply is cut when the hatch is opened, the fans still rotate
and the electrical coil in E-/EP-models is still hot for a while.
There are no user-serviceable parts behind the control panel, contact a service technician
for service and repairs of this part of the unit.
Clarify the cause of the fault before restarting the unit!
TABLE OF CONTENTS
WARNING

5
The LTR-3 ventilation unit is based on regenerative heat recovery. This is achieved with a
rotating heat exchanger through the halves of which incoming air and exhaust air flow in
opposite directions. Aluminium foils of the heat exchanger transfer heat from the exhaust
air to the supply air.
A characteristic of the regenerative heat exchanger is its high rate of heat recovery.
The heating rate of the supply air varies from 75 % to 85 %, depending on the proportion
of supply air and exhaust air (the heat from the supply air fan is taken into count).
Thanks to its high heat recovery, the LTR-3 saves heating energy at the same time as it
takes care of a good indoor air quality; therefore it repays itself in a relatively short time.
STANDARD PARTS
1. LTR-3 ventilation unit
(delivered with EU5 plain filters)
2. MCC-12 remote control
EXTRA EQUIPMENT
- Micro filter EU7 for duct mounting Ø 160 mm
- E09KP-016 Electrical heating coil 900 W for installation in duct with Pulser
regulator and TG-K330 temperature sensor 0…30°C.
- E18KP-016 Electrical heating coil 1800 W for installation in duct with Pulser
regulator and TG-K330 temperature sensor 0…30°C.
OPERATING PRINCIPLE
INSTALLATION PARTS
2
1

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ADDITIONAL EQUIPMENT
- Plain filter EU5
- Bag filter EU5 or EU7
Pulser Triac regulator Bag filter EU7
Filter EU7 + duct casing Electrical heater for installation in duct
Plain filters EU5

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It is recommended that the task of dimensioning the duct system is given to a professional
engineer.
The ducts must be large enough, min. Ø 100 mm, to allow a sufficiently low air speed. In
particular the outside feed and the waste air ducts need to be wide. The size of the outside
air duct, waste air duct and the outside grille must be Ø 160 mm. Do not fit an insect net
behind the grille.
Use only type approved materials, as galvanised spiral-weld or plastic pipe, for the duct
system. Valves which are suitable for mechanical ventilation must be used. Valves with a
diameter of 100 mm or larger are to be used for supply and exhaust air.
The outside air should be taken, if possible from the north side of the building or from a
shady place where temperature variations are moderately small.
The waste air should be led out about 90 cm above the roof saddle. Use insulated factory
made fittings. A cover must be installed on the end of the waste air duct to prevent rain
water from entering the duct system.
To enable duct cleaning, a sufficient number of control hatches should be placed in the
duct system. The control hatch locations could be marked for example on the roof trusses
to make finding them easier.
The exhaust air valves are placed in the following premises: Toilet, kitchen, washroom,
bathroom, clothing storage room, cleaning cupboard and utility room.
The supply air valves are placed in the following premises: bedroom, living room,
separate dining recess, hobby room, dressing room and sauna. We recommend that a
supply air valve is installed in the innermost corner of the sauna. The air flow from the
valve should be directed above the stove.
The air from a room with supply air is supposed to flow through chinks of the doors or “free
flow” door grilles to areas with exhaust air. Normally a 20 mm chink of the door is enough
besides in the sauna where a 100 mm chink is needed. Additional supply air can be
ducted directly to wood-burning fireplaces (in the sauna) from the outside. The duct must
be closable.
Garages or workshops must not be connected into the ventilation equipment of the house;
they should have their own extractor system or independent heat recovery unit.
The cooker extractor hood should not be connected into the house ventilation system.
(Excess steam and grease will cause blockage of the heat exchanger).
A fan assisted drying cabinet can be connected indirectly to the exhaust valve (drying
cabinet - valve attachment) which allows air from both the room and the cabinet to exhaust
from the same valve. The volume through the exhaust air valve has to be at least 12 l/s.
Silencers. A hard silencer 09 is recommended for the exhaust duct, silencer 09 or 06 is
recommended for the supply air duct.
PLANNING OF THE DUCT SYSTEM

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The distances between waste air and fresh air openings. Usually fresh air is taken
from a north facing wall and the waste air is led out from the roof.
Other methods are acceptable, so long as they fall within the guidelines laid out by the
Ministry of the Environment’s code of building regulations (D2: Finland 2003, extract
shown below), or in accordance with your local directives and regulations governing indoor
climate and building ventilation.
The diagram shows how to determine the distance between the outside feed into the
house and the waste from the house.
Waste air - fresh air feed,
in the horizontal plane.
Waste air above
the fresh air feed,
in the vertical plane.
Waste air below
the fresh air feed,
in the vertical plane.
Measurements are in meters
246810 12 14 16 18 20
cl1and2
cl3
cl3
cl4under0,3m³/s
cl2
cl4under1,5m³/s
cl4under3,0m³/s
cl4under6,0m³/s
2
4
6
8
10
12
2
4
6
cl4under0,3m³/s
cl4under1,5m³/s
cl4under3,0m³/s
cl4under6,0m³/s

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The leading of waste air from a building is based on the following, exhaust air
classification
Class 1 Exhaust air which contains few impurities. The impurities are mainly from
people or structures. Air is suitable for return air and transfer air.
Class 2 Exhaust air which contains some impurities. The air is not used as return air of
other premises but can be lead for example to the toilet and washing room as
transfer air.
Class 3 Exhaust air from premises where high humidity, processes, chemicals and
smells essentially lower the quality of exhaust air. The air is not used as return
air or transfer air.
Class 4 Exhaust air which contains ill-smelling or unhealthy impurities considerably
more than the acceptable contents of the indoor air. The air is not used as
return air or transfer air.
Examples of exhaust air class of living areas
Class 1 Office rooms and small adjoining storage spaces, customer service and
teaching premises, meeting and business premises which are non-odorous.
Class 2 Living rooms, dining recesses, coffee kitchens, shops, warehouses of office
buildings, dressing rooms and restaurant premises where smoking is forbidden.
Class 3 Toilets, washing rooms, saunas, apartment kitchens, distribution and teaching
kitchens, copying premises of drawings.
Class 4 Professionally used fume cupboards, grilles and target exhaust air from
kitchens, car garages and driving tunnels, handling rooms of paints and solvent,
dirty wash laundries, store rooms of waste food, chemical laboratories, smoking
rooms, hotel and restaurant premises where smoking is permitted.
(Finland's building regulations D2 2003)
EXHAUST AIR CLASSIFICATION OF LIVING AREAS

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The unit can be installed in a warm, half warm or cold room. If the unit is installed in a cold
room, is it to be equipped with a 100 mm thick cover of isolation. The unit can be installed
i.e. in a storage room or on an attic.
The unit should be placed on a plain surface on a elastic material that muffle sound. For
instance a 100 mm thick isolation plate is suited as bedding. The unit can be mounted on
its edge, so that the front edge is higher than the back edge.
If the unit is used to ventilate a facility with a swimming pool it must be drained. There are
two (2) drain outlets of which the other should be taken it to use, depending of the position
of the unit. At the time of delivery, both outlets are plugged.
Phases of installation:
A. Place the unit on the isolation plate (i.e. a chipboard covered with 100 mm isolation) or
in a storage room or on the attic on a custom made shelf. Take into consideration the
possible drain.
B. Check that there is at least 60 cm of free space in front of the service hatch and that
the electrical inlets are accessible. Take into consideration that opening the lock bolts
require a certain amount of space.
C. Connect the ducts to the tubes on the unit. It is recommended that silencers be
installed to the exhaust air and supply air ducts. Silencers, see page 7.
F. If the unit’s condensation drain is to be used, connect a pipe between the drain outlet
and the nearest floor drain or water trap of a sink. Connecting the unit directly into the
sewage system is not allowed. If the unit is installed in a cold room the drain pipe must
be isolated so it doesn’t freeze.
N.B.! To reduce the weight of the unit remove the rotor before mounting on the wall.
All LTR-3 models
INSTALLATION PHASES

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Instructions for installing the duct heaters E09KP-016 and E18KP-016 in circular ducts.
NB! Read these instructions before installing and connecting the duct heaters.
1. The duct heaters are designed to operate on single phase alternating current. See the
wiring diagram for the particular heater and the electrical data on the rating plate placed on
the cover of the duct heater.
2. The duct heater must be connected to the mains supply with a fixed installed round
cable. The heater must be equipped with a cable grommet or cable fitting designed for the
cable, which ensures that the electrical protection class of the heater is retained. The
standard design is IP43. Electrical protection class IP55 can be delivered if required, in
which case this is specified on the cover of the heater. Design IP55 is delivered with
factory-mounted cable fittings.
3. It must not be possible to switch on the power to the element unless the fan has started
earlier or starts simultaneously.
4. It must not be possible to switch off the power to the fan unless the power to the
element has been switched off earlier or is switched off simultaneously.
5. An all phase breaker with a contact gap of at least 3 mm must be included in the fixed
installation.
6. The installation must be carried out by an authorized electrical fitter.
7. The duct heaters are designed in accordance with the following standards:
SEMKO 111 FA 1982 / EN 60335-1 / EN 60335-2-30.
8. The duct heater satisfy the requirements of the currently valid EMC standard CENELEC
EN 50081-1 and EN 50082-1. The heaters are CE-marked and EMC-marked.
9. The duct heaters are S-marked, tested and approved by SEMKO.
10. The duct heater is equipped with two overheating cut-outs (one with manual reset)
designed to prevent overheating when the airflow is too low or in the event of a fault in the
system.
11. A drawing must be attached inside the fuse box or on the wall of the service room. The
drawing shows the rating of the duct heaters and their location in the building, together
with information about the measures to be taken in the event that the overheat
protection cut-out(s) is activated.
INSTRUCTIONS FOR THE DUCT HEATER

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1. The heater is designed for insertion into standard spiral ducting and is fixed to the
ducting with screws.
2. The air must flow through the heater in the direction of the arrow (located on the side of
the heater close to the connection box).
3. The heater can be fitted in either horizontal or vertical ducting. The electrical connection
cabinet can be freely placed facing upwards or sideways to a maximum angle of 90°.
Fitting with the box facing downwards is NOT allowed.
4. The access opening in the heater must be equipped with a fixed mesh or an intake air
device which makes it impossible to touch the element inside.
5. A warning sign must be attached close to the air outlet, stating that the air outlet must
not be covered.
6. The distance from (to) the heater to (from) a duct bend, valve, filter, etc., should
correspond to at least twice the duct diameter, otherwise there is a risk that the airflow
through the heater is uneven which can cause activation of the overheating cut-out.
Example: model CV 16 => min. 320 mm, CV 40 => min. 800 mm, etc.
7. The heaters may be insulated in accordance with valid regulations for ventilation
ducting. However, the insulation material must be incombustible. The cover of the heater
must be free from insulation so that the type plate is visible and the cover can be removed.
8. The parts of the ventilation system where heaters are installed must be kept accessible
to allow replacement and service.
9. The distance from the heater’s metal casing to any wood or other combustible material
must NOT be less than 30 mm.
10. The maximum ambient temperature allowed is 40°C.
11. The air flow through the heater must have a speed of at least 1.5 m/s.
12. The maximum output temperature allowed is 40°C.
INSTALLATION OF THE DUCT HEATER

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No maintenance is required except a periodic functional test.
Overheating
When the overheating cut-out with manual reset has been activated, the following should
be observed:
1. The heater must not be interfered with in any way, such as removal of the cover, except
by an authorized electrical fitter.
2. Turn off the mains power.
3. Investigate carefully the reason for activation of the cut-out.
4. When the fault has been eliminated, the cut-out can be reset.
Function description Duct heater for external heating control
• The duct heater is designed for external control via a thyristor type Pulser / TTC or via a
thermostat.
• The heater is equipped with an integral overheating cut-out with manual reset which can
be reset on the outside of the cover.
Wiring diagrams
See chapter “Electrical wiring diagrams”
Installation of the temperature sensor
Make a Ø 12 mm hole in the supply air duct 50 cm after the heater (towards the room) and
attach the temperature sensor in the duct using the sensors base. Cabling is drawn,
according to regulations, from the sensor to the Pulser regulator.
Installation of the Pulser regulator
The Pulser regulator is installed according to valid regulations on a mounting box.
MAINTENANCE OF THE DUCT HEATER

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The figure shows different examples of ductwork insulation.
1. Exhaust air duct in warm state (indoor, no insulation).
2. Waste air duct and fresh air duct in warm state (indoor).
Insulation, for example Armaflex™
3. Exhaust air duct on attic under the insulation but above the steam barrier.
4. All air ducts on a cold attic. The waste or fresh air ducts must not be installed
immediately above the steam barrier; there should be a mineral wool insulating layer of
at least 100 mm between them.
HEAT INSULATION OF THE DUCTING SYSTEM
Insulation
2 x 100mm
Insulato
r
20mm
Closed cell type

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The ventilation unit must run continuously and the desired effect is regulated from the
control panel. It is possible to switch off the heat recovery for example during the summer
when the outside and inside temperatures are the same, or when one wants to cool the
indoor air with cool night air. During the summer the house can be kept cool by allowing
the heat exchanger to run and recover the cool inside air.
Regulating the proportion of supply air and exhaust air. The exhaust air flow should
be 5 - 10 % greater than the supply air flow. This is performed by accurately measuring the
air flow through all of the valves with for example a thermo anemometer and by adjusting
them to the correctly calculated values. A correctly balanced system returns a good heat
recovery rate and keeps a slight negative pressure in the building. The negative pressure
keeps the humidity away from the structures. When an adjustment is made, the filters must
be clean and all the valves and outer grilles must be in place. There must not be an insect
net over the fresh air grille.
REMOTE CONTROL PANEL MCC-12 PULSER
Control of fans, 4 fan speed positions. Heating regulator and duct temperature
HRW switch with indicator light. sensor (EP-models, E09- and E18KP-
016 models)
THERMOSTAT ELECTRICAL HEATER FOR
Capillary thermostat (E-models) INSTALLATION IN DUCT Ø 160 mm
B. Supply air temperature switch (E09KP- and E18KP-016 models)
C. Overheating protection reset button D. Reset button for over heating
protection
OPERATION
B
C
D

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LTR-3 does not require any mechanical maintenance, only changing of the filters
periodically and cleaning of the heat exchanger and fans (when needed). The power
supply to the unit is cut when the service hatch is opened. Wait for two (2) minutes before
starting the maintenance work! Although the units power supply is cut when the hatch is
opened, the fans still rotate and the electrical coil in E-/EP-models is still hot for a while.
The hatch is opened by releasing the lock bolts.
Cleaning the heat exchanger. When changing the filters, check the condition of the heat
exchanger. If cleaning is required, remove it from the machine and carefully wash through
the air channels with a hand shower using a neutral detergent. The heat exchanger can
also be cleaned by blowing through the air channels using compressed air. Do not use a
pressure washer and do not submerge the heat exchanger into water!!
When restarting the unit after cleaning, check that the rotor is turning freely.
Cleaning the fans. When changing filters, also check the condition of the fans. If cleaning
is needed the fans are removed from the device and cleaned with a toothbrush or
compressed air.
Changing of filters. The recommended time between filters changes is max four (4)
months. Draw the filter cassettes from the device and loosen the filter fabric from the
frame. Replace new filter fabric back into the frame. Press the filter cassette back into the
machine so that the support network faces towards the heat exchanger. Vacuum-cleaning
the inside of the device is recommended at this point.
The heat exchanger rotates with the aid of a belt. If this becomes worn or broken, it can be
replaced as shown in the following instructions:
Picture 1: removal of cover, 6 screws Picture 2: loosening of space beam
A. Shut off the unit by turning off the main power or unplugging from the wall power
supply. Open the maintenance door.
MAINTENANCE
BELT REPLACEMENT

17
B. Disconnect the heat exchanger plug. Pull the heat exchanger from the appliance.;
Remove the cover plate by unfastening the 6 screws. Picture 1
C. Lie the heat exchanger on its side. Remove the gasket from the space beam. Unfasten
the centre socket-head screw; then the two remaining space bar screws from each
end picture 2. Lift off the space beam.
Picture 3: inserting the new belt Picture 4: pulling through the new belt.
D Thread the new belt carefully between the gap of the outer covering and the edge of
the brush gasket picture 3. At the same time draw the belt inside the heat exchanger
past the brush gasket while turning the heat exchanger wheel picture 4.
E Replace the space beam and locate the wheel centre with the socket-head screw.
Replace and tighten the two end screws of the space beam. Replace the gasket.
Picture 5: belt of heat exchanger in place
F Stand the heat exchanger up. Pull the belt over the pulley. Rotate the wheel a few
revolutions to realign the belt, picture 5. Clean the inside. Replace the cover and
fastening screws. Return the heat exchanger to the ventilation unit. Reconnect the
heat exchangers plug.
G Reconnect the main power to the unit. Turn on the main switch and the heat
exchangers switch from the control panel. Check visually that the rotor is turning.
H Carefully close the doors of the unit.

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Target values for air flows in the living areas.
EXHAUST AIR
Kitchen 20 l/s
Bathroom 15 –17 l/s
Toilet 10 –12 l/s
Clothing room 3 –4 l/s
Hobby room 0,7 l/s, m²
Dressing room 2,0 l/s, m²
Washroom 15 –17 l/s
Cleaning cupboard 4,0 l/s, m²
Utility room 15 –17 l/s
SUPPLY AIR
Living room 8 –17 l/s 0,5 l/s, m²
Bedroom 5 –8 l/s 0,7 l/s, m²
Sauna 8 –17 l/s 2,0 l/s, m²
Separate dining recess 0,5 l/s, m²
Hobby room 0,7 l/s, m²
Dressing room 2,0 l/s, m²
A normal cooker hood is installed over the kitchen stove. The hood should be used only
when cooking. It is still necessary to install an exhaust vent, connected into the general
ventilation system. The exhaust air volume should be 20 l/s.
The cooker hood should not be connected to the LTR-3 ventilation unit.
KITCHEN VENTILATION
TARGET VALUES FOR AIR FLOWS

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Always ventilate with a high enough efficiency! Otherwise the indoor humidity will rise
too high and condensation will form on for instance cold window surfaces.
The recommended relative humidity for indoor air is 40 …45 % (room temperature
20...22 °C). At these levels condensation will not form and the humidity is at a healthy
level. By monitoring the humidity of the indoor air with a humidity sensor, the ventilation
can be increased when the humidity rises over 45%. Alternatively the ventilation can be
reduced if the humidity of the indoor air falls below 40%.
Change the filters often enough! During the winter time the exhaust air filter becomes
dirty more quickly than the fresh air filter. In this case the exhaust air flow will decrease,
which then leads to a rise in the humidity, and also the decline of the incoming air
temperature. With every filter inspection / change, check that the heat exchanger functions
correctly.
TO BE OBSERVED DURING OPERATION!
HEAT RECOVERY EFFICIENCY
LTR-3 efficiency %
Air volume l/s
____ Supply/Exhaust air ratio 1.0 _ _ _ Supply/Exhaust air ratio 0.85
LTR-3 efficiency %
Air volume l/s
LTR-3 efficiency %
Air volume l/s
____ Supply/Exhaust air ratio 1.0 _ _ _ Supply/Exhaust air ratio 0.85

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CHARASTERISTICS