REMKO VRS EN Series Product guide

REMKO QUALITY WITH SYSTEMS
Air-Conditioning | Heating | New Energies
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REMKO GmbH & Co. KG
Klima- und Wärmetechnik
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We reserve the right to make technical changes, and provide no guarantee as to the accuracy of this data!
Operating and installation
instructions
Edition EN - X04 Read the instructions prior to performing any task!
VRS 25 EN, VRS 50 EN, VRS 75 EN, VRS 100 EN, VRS 130 EN, VRS 170 EN,
VRS 200 EN, VRS 270 EN, VRS 340 EN, VRS 440 EN, VRS 540 EN
REMKO VRS EN series
Universal heating units for oil and gas firing

3
Content
Carefully read this operating manual prior to commissioning/using
the units!
This operating manual is a translation of the German original.
This manual is an integral part of the unit and must always be kept
in the vicinity of the installation location or on the unit itself.
Subject to modifications. No liability accepted for errors or misprints!
Safety notes 4
Unit description 5 - 7
Installation instructions 8 - 11
Exhaust gas ducting 11 - 12
Installation and assembly 13 - 14
Commissioning 15 - 16
Shutdown 17
Care and maintenance 17 - 18
Troubleshooting 19 - 20
Maintenance protocol 21
Intended use 22
Customer service and guarantee 22
Environmental protection and recycling 22
Electrical wiring diagram 23
View of the unit 24
Spare parts list 25
Unit specifications 26 - 27
Unit dimensions 28
Accessories 29 - 31
Technical data 32 -33
Drive technical data 34

4
REMKO VRS EN Series
Safety notes
The units have been subjected
to extensive material, functional
and quality inspections prior to
delivery. However, dangers can
result from the units if they are
used improperly or not as intended
by untrained personnel.
Please observe the following notes:
■
The units may only be operated
by persons that have been
instructed in the operation of the
equipment
■
The units must be installed and
operated in such a way that
personnel are not endangered
by radiant heat and no fires may
occur
■
The units must only be operated
in areas where the units can
be supplied with an adequate
amount of air for combustion
If this cannot be ensured, a
separate burner fresh air intake
from outside must be installed.
■
The units may only be installed
on a non-combustible surface
■
The units may only be mounted
on stable structures or ceilings
made of non-flammable
construction materials and with
sufficient bearing capacity
■
The fastening must take place
with bearing anchors, which are
to be fastened to the unit
■
The units may not be installed
or operated in potentially
flammable or explosive
environments
■
The units must be installed away
from traffic zones - also by
crane, for example.
■
A safety zone with a clearance of
1 m must be ensured
■
The protective grid of the intake
must always be kept free of dirt
and loose objects
■
Never insert foreign objects into
the unit
■
The units must not be exposed
to direct jets of water e.g.
pressure washers, etc.
■ Never allow water to enter the
inside of the units
■
All electrical cables for the
units must be protected against
damage (including damage
caused by animals)
Always observe the respective local building code and fire prevention guidelines
as well as the guidelines of the accident prevention and insurance associations
when using the units.
The brand-dependent suitability
of the forced-air burner must be
ensured for the respective type
of fan-assisted heater.
NOTE
Only type-approved forced-air
oil burners in WLE design per
DIN EN 298 and DIN EN 267
(oil) as well as DIN EN 676
(gas) should be used.
■ Portable fuel containers must
only be set up and used in
observance of the technical rules
for combustible liquids "TRbF
20".
■ This unit can be used by
children above the age of
8, as well as by people with
impaired physical, sensory or
mental capabilities or a lack
of experience and knowledge
if they are supervised or have
received instruction in the safe
operation of the unit, and if
they understand the associated
potential hazards. Children
must never play with the unit.
Cleaning and user maintenance
must not be carried out by
unsupervised children.
CAUTION

5
Unit description
The units are stationary, directly
fired fan-assisted heaters (WLE)
with heat exchanger and exhaust
gas connection.
The units can be directly fired with
EL heating oil, diesel fuel, liquid
gas or natural gas.
The units must also preferably be
operated with biomass fuels to
ensure environmentally friendly
unit operation. The following
biofuels are permitted:
- Biodiesel B7/B10
(FAME content less than 10%);
- Hydrogenated vegetable oils
(HVO; compliance with
DIN EN 590 required)
The units are designed exclusively
for operation with separate fan
burners.
For the safe discharge of exhaust
gases above the roof, the units
must be connected to a suitable
exhaust system.
The units are equipped as standard
with 1-stage, low-noise/low-
maintenance centrifugal fans and
with attached and electrically wired
switching and control devices.
The switching and control devices
consist of a fan controller (TR),
two temperature monitors for
controlling the outlet temperature
(TW1/TW2) and a safety
temperature limiter (STB). In the
following, these units are described
as "controller unit".
NOTE
The units are not suitable for
the heating of living spaces
or the like.
Locations at which units are
used
As directly fired fan-assisted
heaters (WLE), the units deliver
instant heat.
The units are designed exclusively
for industrial or commercial use.
The units can be equipped with air
ducts on the intake/outlet side if
designed accordingly.
As a rule, there are hardly any
restrictions on their use with regard
to the installation location.
The units may be used among
other things for the following:
■ Heating / temperature control
of workshops
■ Heating / temperature control
of warehouses
■ Heating / temperature control
of event halls
■ Heating / temperature control
of exhibition halls
■ Heating / temperature control
of lightweight-construction
halls
■ Heating / temperature control
of sales rooms
■ Heating or frost protection in
garden/agricultural outbuildings
The units are to be used
exclusively for industrial and
commercial applications. They
are not intended for the heating
of living spaces or the like.
!CAUTION
The robust construction and
careful processing of the units,
which are made exclusively of
high-quality materials, guarantee
many years of trouble-free
operation.
Further plus points are the simple,
fast and cost-effective installation
and service-friendliness of the
units.
The units conform to
the fundamental health and safety
requirements of the appropriate
EU stipulations, and are simple
to operate.

6
REMKO VRS EN Series
Mode of operation
After connecting the unit to the
mains, the phase indicator lamp
H1 on the control box illuminates.
The fan burner is switched on
by pressing the heating selector
switch. The heating signal lamp
built into the heating selector
switch illuminates.
The combustion chamber with
heat exchanger is now heated up.
When the setpoint temperature
is reached, the supply air fan
switches on automatically. The
setpoint temperature is specified
by the fan controller TR.
The ventilation signal lamp in
the ventilation selector switch
illuminates. When the setpoint
temperature is reached, the fan
cannot be switched off by the
ventilation selector switch.
When operating with a room
thermostat, this process is repeated
automatically depending on the
heating requirement.
The controller unit and the
automatic burner execute all unit
functions fully automatically and
ensures reliable monitoring.
When the burner function is
enabled by the controller unit and
the room thermostat, the burner
operating lamp on the control box
illuminates.
After switching off the units via
the heater selector switch or the
room thermostats, the supply air
fan runs to cool the combustion
chamber and the heat exchanger
for a certain time and then
switches off automatically.
In the event of irregularities or
if the flame is extinguished, the
automatic burner switches off and
interlocks the burner.
The burner fault lamp of the
automatic burner relay and the red
burner fault lamp on the control
box illuminate. The units can
only be restarted after manually
resetting the automatic burner.
The safety temperature limiter
(STB) interrupts the burner
function in the event of
overheating. In this case, the
burner is disconnected from the
mains, the fan continues to run for
post-cooling. Manually resetting of
the STB can only be implemented
after the unit has have cooled
down.
The fan motor is monitored by a
thermal cut-out (TMC). If this is
triggered, the complete circuit of
the burner is also interrupted. In
this case, the motor indicator lamp
on the control box extinguishes.
The units may never be
disconnected from the mains
prior to the completion of
the follow-up cooling phase
(except in emergencies).
CAUTION NOTE
Before resetting the automatic
burner relay or safety thermal
cut-out, first always determine
the causes of the fault
shutdown.

7
The 4 functions of the
controller unit:
1. Fan controller (TR)
Controls the switching on and
off of the fan. The switching
point is set via the "setting lever
TR".
Setpoint value approx. 40°C
2. Temperature monitor for
the burner (TW 2)
The temperature monitor limits
the discharge temperature.
The switching point is set via
the "setting lever TW 2".
Setpoint value approx. 75 – 80°C
3. Temperature switch for
the second stage of the burner
(TW 1)
The temperature switch controls
the stage of the burner.
If the set temperature is
exceeded, the burner is
switched to the lower stage
(partial load operation). The
switching point is set via the
"setting lever TW1". Setpoint
approx. 10-15 K below TW2
4. Safety
thermal cut-out (STB)
Takes over the control function
of the temperature monitor.
Switching point fixed at 100°C.
A restart interlock prevents the
burner from restarting after
tripping. The reset button
(RESET) must be operated
manually from the outside with
the housing cover closed.
Thecontroller unit has a probe
self-monitoring and is cold-proof
down to -20°C. The unit switches
off below -20°C, but switches on
again when the temperature rises
and is then fully functional.
In the event of the probe or the
capillary tube being damaged, as
well as if a temperature of ap-
prox. 220°C is reached, the filling
medium will be emptied and the
controller unit will switch off for
safety. The controller unit is no
longer fully functional and must be
replaced.
To replace the controller unit, ob-
serve the following instructions,
among others:
■ The capillary tubes must not
be damaged or kinked during
installation
■ Bends may only be made on
the capillary tube and not on
the probe
■ For safe operation of the unit,
the probes must always be
exposed in the hot air flow
■ The probes must always be free
of dust and dirt
■ Capillary tubes and probes must
not show any damage
■ The probes must not be in
contact with the combustion
chamber
Controller unit per DIN EN 14597
Oil-fired or gas-fired warm air heaters must be equipped with intrinsically
safe control devices in accordance with DIN EN 14597.
70
80
60
°C
TW1
50
STB
20
80
70 60
50
40
30
°C
TR
70
80
60
°C
TW2
50
NOTE
When replacing the controller
unit, only an original REMKO
spare part may be used!
CAUTION
In order to prevent a renewed
exceedance of the triggering
temperature the operating
conditions of the unit should
be checked before resetting
the STB.
CAUTION
Safety devices may not be
bypassed or disabled during
unit operation!
CAUTION
Careful and professional
installation or assembly must
be ensured.

8
REMKO VRS EN Series
Selection of the installation
location
With determination of the installation
location, the requirements must be
coordinated in regard to:
1. Fire protection and operational
hazard.
2. Function:
Space heating free-blowing or
with duct system.
Observe pressure conditions in
the installation room.
3. Operational issues:
Heat requirement, air volume
flow, recirculation or fresh
air operation, humidity, air
distribution, room temperature,
space requirement.
4. Facility for connecting to an
exhaust gas system.
Oil and gas-fired fan-assisted heaters
(also with a nominal heat output of
more than 50 kW) may generally be
installed outside of heating rooms in
compliance with the FeuVo.
The building authority guideline
for the "Erection and installation of
combustion appliances" must be
observed.
For rooms in which highly
flammable substances or mixtures
are processed, stored or produced
in such quantities that ignition
creates hazards, exceptions may
be permitted if suitable measures
are taken to ensure that the
substances or mixtures cannot
be ignited by the combustion
appliance.
With the installation of the units,
the local and country-specific
regulations (LBO) and combustion
plant order (FeuVO) of the
respective state must be observed.
The first enactment of the
(German) Federal Emission
Control Act (1st BlmSchG)
and the statutory provisions of
the ordinance governing small
combustion plants (1st BlmSchV)
must also be applied.
The fuel supply must be installed
in accordance with DIN 4755 for
oil-fired warm air heaters, DVGW
Code of Practice G 600 for gas-
fired warm air heaters and TRF for
liquid gas.
However, fan-assisted heaters in
particular are excluded from some
points.
Installation instructions
Combustion air supply
Sufficient supply of combustion
air must be generally ensured by
the respective building authority
requirements.
Excerpts from the M-FeuVO (may
differ slightly per federal state).
(1) For room-air dependent
combustion appliances with a
total nominal heat output of
up to 35 kW, the combustion
air supply shall be deemed to
be verified if the combustion
appliances are installed in a
room that:
1. Has at least one door to
the outside or a window that
can be opened (rooms with
connection to the outside) and
a room volume of at least 4 m3
per kW total nominal heat
output or
2 . Has an opening leading to
the outside with a clear cross-
section of at least 150 cm2or
two openings of 75 cm2each
or pipes leading to the outside
with cross-sections equivalent
in terms of flow.
(2) For room-air dependent
combustion appliances
with a total nominal heat
output of more than 35 kW
and not more than 50 kW,
the combustion air supply shall
be deemed to be verified if
the combustion appliances are
installed in rooms that meet
the requirements per paragraph
1 No. 2.
(3) For room-air dependent
combustion appliances with
a total nominal heat output
of more than 50 kW, the
combustion air supply shall be
deemed to be verified,
NOTE
Only type-approved forced-
air oil burners in WLE design
(per DIN EN 267) or gas
burners (per DIN EN 676)
should be used.
CAUTION
The units must be set up and
installed in such a way that
they are easily accessible
for monitoring, repair and
maintenance work.
CAUTION
Overpressure and underpressure
in the installation area
should be avoided as this will
inevitably lead to combustion-
related malfunctions.

9
■ The equipment must be
installed in such a way that it
does not cause any hazards or
unacceptable nuisances, e.g.
due to vibrations, oscillations or
noise
■ The units must be set up and
installed in such a way that they
are easily accessible for repair
and maintenance work
■ Operating elements whose
improper operation can lead to
dangerous operating conditions
must be protected against
unauthorised operation if they
are generally accessible
■ Direct intake of outside air is
not recommended with the
standard combustion chamber.
When installing mixed air
dampers (accessories), they
must be coupled in opposite
directions.
The proportion of fresh air
supplied should not exceed
30%
■ The units may not be installed
or operated in potentially
flammable or explosive
environments or areas
if the units are installed in
rooms that have an opening or
pipe leading into the open air.
The cross-section of the
opening must be at least
150 cm2and 2 cm2more for
each kW of nominal heat
output exceeding 50 kW.
The pipes must be dimensioned
to be equivalent in terms of
flow.
The required cross-section may
be divided between a maximum
of two openings or lines.
(4) Combustion air openings
and lines must not be closed
or blocked unless special
safety devices ensure that the
combustion appliance can only
be operated when the closure
is open. The required cross-
section must not be narrowed
by the closure or grille.
(5) By way of derogation from
paragraphs 1 to 3, a sufficient
combustion air supply may
be demonstrated in another
way for room-air-dependent
combustion appliances.
For example through:
A continuous pipe of sufficient
cross-section connected to
the burner or its casing to
the outside. This cross-section
must be adapted to the
available suction power of the
burner and the line resistances
(including the intake guard)
so that proper combustion is
ensured.
Set-up
■ The units must then only be
installed and operated in areas
where the units can be supplied
with an adequate amount of
air for the combustion and the
exhaust gases can be routed
to the outside via a suitable
exhaust gas system
■ Room-air dependent units
may only be installed in rooms
or buildings from which air is
extracted by means of
fans,
such as ventilation
or exhaust air
systems, etc., if:
1. Simultaneous operation of
the unit and the air extracting
system(s) is prevented by safety
devices,
2. The exhaust gas routing is
monitored by special safety
devices,
3. The exhaust gases from
the unit are discharged via the
air extraction system(s) or
4. The design or dimensioning
of the system ensures that no
dangerous negative pressure
can occur
■ The units must be set down
stably on a non-combustible
surface away from traffic zones
- also by crane, for example
■ The units must be installed and
operated in such a way that
personnel are not endangered
by exhaust gases and radiant
heat and no fires may occur
CAUTION
The standard version of
the units is not suitable for
exclusive use as supply air
units.
NOTE
The units are suitable for use
with accessories on the intake/
outlet side.

10
REMKO VRS EN Series
Mounting on the ground
The units must be set down stably
on a non-combustible surface
away from traffic zones - by crane,
for example .
To protect the units from damage
in commercial premises, for
unhindered maintenance and
repair on the unit and burner, and
for unhindered
air intake and exhaust, a protective
zone of
1 m around the unit must
be kept clear
.
This protection zone shall be
marked by a sign with the
following inscription:
Fixed demarcation is
recommended for frequently used
areas.
Wall installation
The wall intended for installation
must also consist of non-
flammable materials. Its load
capacity must be checked
(reinforcements must be installed
when necessary).
The brackets must be sufficiently
anchored to the wall and the units
must be securely fastened to them.
Sufficient clearances for
maintenance of the heat
exchanger, burner, fan and flue gas
system must be provided.
■ It must be possible to actuate
control elements for the
units and fuel supply from
the ground
■ If auxiliary equipment is
required for monitoring,
maintenance and repair work,
this must be provided by the
operator
Mounting hanging units
The units may only be mounted on
stable structures or ceilings made
of non-flammable construction
materials and with sufficient
bearing capacity.
The fastening must take place with
suitable anchors, which are to be
securely fastened to the unit.
The requirements listed in the
"Wall mounting" section
should also be observed.
Room heating
Fan-assisted heaters may only be
operated in closed rooms and halls
via a room thermostat.
Fuel supply
The fuel supply must be installed
in accordance with DIN 4755 for
oil-fired warm air heaters, DVGW
Code of Practice G 600 for gas-
fired warm air heaters and TRF for
liquid gas.
Particularly in the case of heating
oil pipes, care must be taken to
ensure that their cross-section is
sufficiently large.
The suction lift, the total line
resistances and increased viscosity
at lower temperatures must
be taken into account in the
determination.
Appropriate separate oil
production units may need to be
provided.
The lines must be laid in such a
way that they can be easily bled
and are protected against corrosion
and mechanical damage.
Electrical installation
Ensure that an impermissible
undervoltage due to a mains
overload is not possible, even if
this is only temporary.
For the connection of the units,
use cables with cross-sections that
do not cause an impermissible
drop in voltage even when the fan
starts up.
When connecting the units in
400 V version, ensure the correct
phase sequence of the rotating
field (right).
An incorrectly made connection
can lead to the fan turning in the
wrong direction.
An emergency switch must be
fitted in an easily accessible place
in the room where the unit is
installed for units with a rated heat
power of 50 kW or more.
Protection zone
Keep a distance of 1 m
CAUTION
The measured pressure of the
suction pipe should not exceed
minus 0.3 bar and must not
exceed minus 0.4 bar.
CAUTION
All switches, if generally
accessible, must be protected
against damage and
unauthorised use!
CAUTION
The electrical connection
of the unit must be carried
out by authorised specialists
in accordance with DIN EN
60335-1 and DIN EN 50156-1.

11
As a rule, the units must be
connected to a suitable and type-
approved exhaust gas system.
Exhaust systems are structural
installations in or on buildings
that are exclusively intended to
safely discharge exhaust gases
from combustion appliances via
the roof.
For the planning and construction
of flue gas systems, the following
are of particular importance:
■ The respective combustion
systems ordinance [FeuVo]
■ The respective state building
code [LBO]
■ DIN 18160 Part 1, Planning and
execution
■ DIN EN 13384 Part 1, Thermal
and fluidic calculation methods
■ Technical rules for gas
installation DVGW-TRGI 2008
With the planning and installation
of exhaust gas systems, the
following points must be
observed:
■ The installation and assembly
of the flue gas system must be
carried out professionally and in
accordance with the applicable
regulations
■ The dimensions of the flue pipe
must be designed in accordance
with the unit power rating and
the structural conditions or
requirements
Annual inspection and
maintenance
In accordance with the operating
conditions, the units must, if
necessary, be checked at least
yearly by a specialist to ensure that
they are in a condition that is safe
to use.
For reasons of operational
readiness, functional safety,
economic efficiency and
compliance with the emission
limits, the operator must have the
units inspected at least once a year
by a representative of the installer
company or another expert.
For the measurement of the
combustion values, the legal
provisions of the BImSchV. shall be
applied.
If defects are found, the operator
must be informed that they must
have components repaired or
replaced immediately.
The following applies to this:
Repair work on the limiting
devices, the self-regulating devices
and the flame monitoring devices
as well as on other safety devices
may only be carried out on the
individual device by the respective
manufacturer or their authorised
representative.
Exhaust gas ducting
■ Exhaust systems must be
dimensioned in terms of clear
cross-section and height in such
a way that the exhaust gases
are discharged into the open
air in all intended operating
conditions and no dangerous
positive pressure can occur with
respect to rooms
■ The mouths of exhaust systems
must project at least 40 cm
above the ridge or be at least
1 m away from the roof surface
■ If dynamic pressures are
to be expected, e.g. due
to downdrafts or from
neighbouring buildings,
the chimney head must be
designed accordingly
■ In the case of roof or wall
ducts, the flue gas system
must be routed through a pipe
sleeve or a shaft to allow free
expansion of the flue gas pipe
when it heats up
■ The unit connection must
be tight and secured against
unintentional loosening by
means of a rivet or screw
■ Horizontal flue gas sections
should preferably be kept as
short as possible
■ A resealable measuring
opening at a distance of 2 x
flue pipe D(Ø) behind the unit
connection must be provided
NOTE
The construction of the flue
gas system is in any case
subject to approval.
CAUTION
There must be no counter pressure arising
from incorrect installation of the exhaust
gas ducting under any circumstances.
NOTE
We recommend concluding a
maintenance contract with an
authorised specialist company
for regular maintenance and
cleaning work.

12
REMKO VRS EN Series
Application examples:
REMKO ASD exhaust system
Stainless steel, double-walled,
outdoor mounting
REMKO ASE exhaust system
Stainless steel, single-walled,
indoor mounting
The exhaust gas system
components are connected very
simply through mating, and are
secured with clamps.
All REMKO stainless steel flue
systems are generally approved
by the institute for construction
technology [Institut für
Bautechnik].
Legend:
1 = Outlet element, AS-ME-D
2 = Chimney tube AS-1000-D
3 = T-joint AS-T90-D
4 = Cleaning component AS-RT-D
5 = Base plate AS-GI-D
6 = Wall bracket AS-WK-D
7 = Junction piece AS-ÜGI-D
8 = Chimney tube AS-1000-E
9 = Chimney tube AS-500-E
12 = Wall bracket
Example upright unit installation
Example horizontal unit installation
7
12
1
2
3
4
5
6
8 / 9
1
2
3
4
5
6
7
8 / 9
We reserve the right to modify the dimensions and design as part of the ongoing technical development process.
Additional specifications for fresh air and
flue gas ducting
The following applies to all models in the VRS EN range:
B1-air heater: no
C2-air heater: no
C4-air heater: no
500

13
When installing the units,
the regulations and ordinances
applicable to the respective federal
state must always be observed.
It should also be noted:
■ The units must be installed in a
stable position
■ The units must be placed on
the floor in a safe and stress-
free manner, preferably on a
separate vibration-damped base
■ Make sure that the fan power
(nominal pressure) is adapted
to the respective air-side
resistances Measure nominal
current!
■ Check that the inlet and outlet
are free
■ The supply of sufficient
combustion air must be ensured
■ If overpressure or underpressure
or significant air impurities
occur in the installation room, a
separate burner fresh air intake
(accessory) must be installed
■ If significant air pollution is to
be expected in the installation
room, the recirculation air
drawn in should be drawn in via
appropriate filters (accessories)
The resistance on the suction
side must be observed and the
fan power must be adjusted
accordingly!
Room thermostat connection
The room thermostat (accessory)
must be placed in a convenient
location for temperature control.
The thermostat probe must not be
located directly in the warm/cold
air flow and must not be mounted
directly on a cold base.
The same procedure must be
followed when installing an
automatic day/night temperature
control or other temperature
controls available as accessories.
Installation and assembly
Exhaust gas connection
The design must comply with DIN
18160 Part 1, the dimensions with
DIN EN 13384 Part 1.
■ Proper exhaust gas routing
must be ensured
■ The flue gas connection must
be carried out professionally in
accordance with the applicable
regulations
■ The flue gas connection may
only be made to a previously
approved flue gas system
Electrical connection
The electrical connection of the unit
must be carried out by authorised
specialists in accordance with DIN
EN 60335-1 and DIN EN 50156-1.
■ An emergency switch must be
fitted in an easily accessible place
on units with a nominal heat
power rating of more than 50 kW
■ The emergency switch must be
protected against unauthorised
operation
CAUTION
The transport pallet or timbers
must be removed before
installation.
NOTE
The air intake may only take
place via the intake openings
provided.
If the bottom of the unit is not
designed as an intake variant,
it must always be closed to
prevent false air intake.
NOTE
All connection terminals of
the electrical wiring are to be
checked for firm seating and
tightened as necessary.

14
REMKO VRS EN Series
A room thermostat or a day/night
temperature control is connected
to the corresponding terminal
block X2 in the control box for
these versions.
The connection must be made as
follows:
Remove the factory cable bridge
and connect the terminals with
the corresponding wires of
the respective control system.
The respective separate
connection diagrams of the
control system and the unit must
be observed!
Terminal block X2
■ The combustion chamber must
not be underloaded (increased
condensate formation)
■ The separate operating
instructions for the burner must
be observed
■ The usability of the forced-air
burner for the unit must be
ensured (WLE version)
Gas connection
Adequate gas pressure and
quantity of gas, in accordance
with unit performance, must be
continuously available during unit
operation.
■ Installation of the gas
connection should be performed
only by authorised specialists
■ The DVGW Code of Practice G
600 for gas-fired fan-assisted
heaters and the TRF for liquid
gas must be observed
■ Gas pressure regulators and
shut-off valves must be
provided by the customer as a
matter of principle
■ The cross-section of
the pipework should be
determined in accordance
with the connection value of
the unit, the total pipework
resistance and the amount of
gas supply pressure
NOTE
Before initial commissioning,
the gas supply line must
be thoroughly cleaned and
checked for leaks!
Heating oil connection
Sufficient and professional fuel
supply must be ensured.
■ The suction pipe in the heating
oil tank must be fitted with
a foot valve as a matter of
principle
■ Even at low outside
temperatures it is necessary
to ensure that there is an
adequate supply of heating oil
that is capable of flowing.
Depending on the quality
of the heating oil, paraffin
formation can start from
approx. 5°C.
Appropriate measures must be
taken to avoid this!
Burner installation
The forced-air burner is mounted
on the front of the unit with a
clamping flange.
Observe the following points:
■ Only type-tested forced-air oil
burners per DIN EN 267 in WLE
design or forced-air gas burners
(per DIN EN 676) may be used
■ It is essential to set the burner
to the full heat load of the unit
CAUTION
Assembly, set-up and
maintenance work on the gas
supply may only be carried out
by specialist personnel authorised
by the gas supply company!
X2 12 13 N PE
2 3 1 PE
RT (optional)
RT (optional)

15
Motor thermal cut-out (TMC)
To protect the fan motor, a
thermal cut-out is installed in
the motor winding. If too much
heat is generated inside the motor,
the circuit is interrupted.
The motor indicator lamp
extinguishes.
Commissioning
Initial commissioning
The initial commissioning of
the units and their forced-air
burners must be carried out by
the manufacturer or another
authorised expert appointed by
him. In doing so, all regulating,
control and safety equipment must
be checked for correct function
and correct settings.
■ The commissioning of oil and
gas-fired units must always
be carried out by authorised
specialist personnel
■ All screws and nuts of the fan
and burner fastening must be
checked for firm seating
■ All air outlet grilles must
be opened and adjusted if
necessary
■ The settings and function of
the controller unit are to be
checked
■ Switch on the local main switch
or fuses/breakers
■ Set the room thermostat
higher than the existing room
temperature
■ Open the fuel supply and
switch the "Heating" selector
switch.
■ The fuel oil or gas flow rate
must be set in accordance with
the heat load of the unit
See unit name plate!
Commissioning the fan motor
Testing the drive
1. Check the fastening screws
of the entire drive are firmly
seated.
2. Check the pretension of
the drive belt(s).
Measuring the current
consumption
1. To avoid faulty measurements,
open the grilles in the air duct or
the exhaust hood.
All intake or blanking plates
provided are to be mounted on
the unit.
2. Check the mains voltage for
correctness.
3. Carry out the necessary
measurements and adjust the
settings if necessary.
■ Direct start-up
The measured rated current
must not exceed the value
specified on the motor's name
plate.
■ Y/Δ−Start-up
The measured rated current
must not exceed the value
indicated on the motor's name
plate.
NOTE
To exclude measurement
errors, each phase should be
measured separately.
CAUTION
The correct rotating direction
of the fan must be checked.
NOTE
The rated current of the drive
motor must be multiplied by
a factor of 0.58.
Current consumption too high
If the fan motor draws too much
current despite proper electrical
connection and sufficient mains
voltage, the air-side resistors
(intake and outlet side) must be
checked for correct dimensioning.
Implement appropriate measures
to remedy the situation

16
REMKO VRS EN Series
Heating mode
The units operate fully
automatically and in accordance
with the room temperature.
1. Switch on the local main switch
or fuse(s)/breaker(s).
2. Open the fuel supply.
3. Set the desired temperature on
the room thermostat.
4. Switch the "Heating" selector
switch.
It should be noted that the fan
burner switches on immediately
when heat is required, but the
supply air fan is only switched on
automatically after the setpoint
temperature has been reached.
This prevents the unwanted
blowing out of cold air.
Move the two selector switches to
the “0” position.
The supply air fan continues to run
to cool down the heat exchanger
and may start several times until it
is finally switched off.
For longer periods of inactivity,
the units should be disconnected
from the mains and the fuel supply
shut off.
Shutdown
Ventilation
1. Turn the "Ventilate" selector
switch.
In this switch position, the supply
air fan runs permanently.
The units can be used for air
recirculation or ventilation
purposes.
Thermostatic control is not
possible.
■ The burner must be set to
optimum values in accordance
with the manufacturer's
specifications, but at least to
those of the federal emission
control act
■ A measurement report must be
generated and handed over to
the operator for safekeeping
■ The operator must be familiarised
with the operation of the system
■ The specialist contractor
declaration
and the contractor
certificate of the respective
installation company carrying
out the work must be submitted
to the responsible authorities.
CAUTION
The unit may never be switched
off via the main switch or an
emergency switch prior to
the completion of the cool-down
phase (except in emergencies).
NOTE
If the units are not set to their
nominal heat load (see name
plate) or if the design is too
large for the required heat
demand, the burners operate
in cycle mode.
Cycle operation can
significantly reduce
the efficiency of the
equipment and the life of
the components.
0
1
0
1
0
1
CAUTION
Before commissioning,
the operating instructions for
the burner must be observed!
For setting values, please refer
to the respective instructions!
!

17
For reasons of operational
readiness, functional safety,
economic efficiency and compliance
with emission limits, the operator
shall have the installation inspected
by an authorised expert at least
once a year.
■ The entire unit, including
the heat exchanger, combustion
chamber and fan burner, must
be cleaned of adherent dust or
dirt
■ The combustion residues in
the combustion chamber and
in the heat exchanger are to be
removed by appropriate means
■ The V-belt tension and the
motor fastening must be
checked regularly
■ Wear parts such as flue gas
brakes, seals, oil filter insert, oil
nozzles etc. must be checked
and replaced if necessary
■ It is essential to follow the
maintenance instructions for
the separate forced-air burners.
Care and maintenance
Rußschichtdicke [mm]
01,0 2,0 3,0 4,0
Wirkungsgradverluste [%]
Anstieg der Abgastemperatur [K]
40
0
80
120
160
200
6
0
8
10
12
14
4
2
■ The restrictions on exhaust gas
losses per §1 paragraph 1 of
the ordinance on small furnace
systems (1st. BImSchV must be
observed
■ Proof of the work carried
out by authorised specialist
personnel, together with
the usual logs, is therefore
mandatory
Soot deposits
Even small deposits of soot on
the heat transfer surfaces of
the combustion chamber and heat
exchanger will insulate the heat
output.
This results in a deterioration of
the combustion efficiency.
A soot layer just 1 mm thick can
cause an exhaust gas temperature
increase of approx. 50 K
(see diagram).
As can be seen from the above,
optimal burner adjustment
and regular maintenance are
indispensable for maintaining
efficiency and emission limits.
CAUTION
Prior to maintenance or
repair work, the unit must be
disconnected from the mains
power supply.
CAUTION
It is not sufficient to switch off
the unit only via the operating
switch!
CAUTION
Adjustment and maintenance
work on the unit and forced-
air burner may only be
carried out by authorised and
qualified technicians!
NOTE
We recommend concluding a
maintenance contract with an
authorised specialist company
for regular maintenance and
cleaning work.
CAUTION
If the operational cleaning and
burner adjustment intervals are
not adhered to, all warranty
claims will be invalidated!
NOTE
Contact the unit manufacturer
before you replace the parts
with parts or components other
than those listed in the spare
parts list.
Soot layer thickness [mm]
Efciency losses [%]
Increase in exhaust gas temperature [K]

18
REMKO VRS EN Series
Cleaning the combustion
chamber and heat exchanger
1. Disconnect the unit from
the power supply.
2. Shut off the fuel supply
.
Dismantle the following components:
1. The fan burner.
2. Burner plate with burner
flange.
3. Front cladding panel(s).
4. A lateral cladding panel
(left or right, depending on
the structural conditions).
5. The 2 front inspection
covers.
6. The side access panel.
7. Pull the flue gas brakes out
of the heat exchanger tubes
and clean them or replace
them if damaged.
Note the arrangement of the
exchanger tubes!
8. Clean the heat exchanger
tubes with suitable cleaning
agents to remove adherent
combustion residues.
9. Remove combustion residues
from the front and rear
collection boxes with a
suitable vacuum cleaner.
Fig. VRS 50 E - upright
without burner
10. The combustion residues in
the combustion chamber must
also be removed through the
burner opening with a suitable
vacuum cleaner.
A special boiler cleaning set
for the REMKO industrial
vacuum cleaner is available as
an accessory.
11. After the cleaning work is
complete all parts should be
carefully re-fitted in reverse
order.
12. Ensure that the exchanger
tubes are correctly seated
and that all seals are in good
condition.
Damaged or deformed seals
must be replaced.
13. Burner maintenance must also
be carried out in accordance
with the burner's separate
operating instructions.
3
5
6
1
2
4
7
8
8
CAUTION
It is not sufficient to switch off
the unit only via the operating
switch!
NOTE
The restrictions on exhaust gas
losses per §10 of the ordinance
on small furnace systems (1st.
BImSchV) must be observed.
CAUTION
The burner and all control
devices must be checked for
correct functioning.

19
Troubleshooting
The burner does not start
■ Check the oil filter(s) for
contamination. Replace
contaminated oil filter(s)
■ Check whether the shut-off
cock on the oil filter is open
■ Check the fuel tank for
sufficient fuel level
■ Check the fuel and the filter
for paraffin precipitation.
Paraffin precipitation is
possible as soon as the
temperature drops below 5°C!
■ Check the oil hoses for damage
and leaks
Air may be sucked in!
■ Check the safety thermal cut-
out (STB)
■ Check the temperature
monitors (TW1/TW2)
■ Check the capillary tubes and
probes of the controller unit for
damage and correct positioning
of the probes
■ Check whether the fault lamp
of the automatic burner control
unit illuminates
■ If the fault lamp illuminates,
unlock the automatic burner by
pressing the fault button.
The fault lamp extinguishes
and the burner attempts to
start!
The unit does not start
■ Check the customer-provided
mains power supply
■ Check the fuses in the switching
cabinet. The phase indicator
lamp must illuminate
■ Move the "Heating" selector
switch to the "I" position
■ Check whether the "Burner"
indicator light on the control
box is illuminated
■ Check the thermostat
connection or, if necessary,
the cables of the room
thermostat
■ Check the setting of the room
thermostat.
The temperature set must be
higher than the current room
temperature
■ Check whether the safety
thermal cut-out (STB) has
tripped
CAUTION
Prior to maintenance or
repair work, the unit must be
disconnected from the mains
power supply.
CAUTION
Before resetting safety
equipment, the cause of
the trigger must be identified
and rectified.
NOTE
Safety devices may not be
bypassed or disabled during
operation of the unit!
CAUTION
If the burner should carry out
a fault shut-down once again
after the start phase, then
another reset should be carried
out after a waiting period of
5 minutes has passed.
Further reset procedures must
be prohibited as there is a
danger of deflagration.

20
REMKO VRS EN Series
The supply air fan does not
start
Move the "Ventilate" selector
switch to the "II" position.
The supply air fan should now
start!
If not:
■
Check the customer-provided
mains power supply
■ Check the fan and drive can
move freely
■ Check the fan drive V-belt
■ Check the electrical cables on
the fan motor for damage
■ Check the fan to see if it was
overloaded and the motor
thermal cut-out tripped
■ Check the operating capacitor
of the fan of the 230 V version
CAUTION
Repair work on the electrical
installation and on the burner
must be performed exclusively
by authorised specialists for
safety reasons.
CAUTION
Adjustment and maintenance
work on the unit and forced-
air burner may only be
carried out by authorised and
qualified technicians!
NOTE
If all of the functional checks
have been carried out without
any findings, please contact an
authorised service station.
Possible causes of malfunction:
■ The units were not able to cool
down because the electrical
connection was interrupted.
Even a brief interruption of
the power supply can cause
the STB to trip
■ Too high an outlet temperature
due to incorrectly implemented
air ducting or air louvre settings
■ The fan was overloaded and
the motor thermal cut-out has
tripped
■ The V-belt for the fan drive is
loose or defective
■ The air inlet or air outlet is not
free
■ Check the temperature
controller (TR) for function and
correct setting
■ Check the temperature
monitors (TW1/TW2) for
function and correct setting.
TW1 should be set at least 10K
below the setting value of TW2.
Otherwise, the unit may only
operate in partial load mode.