60% of the buildings that will be
standing in 2050 are already here with
us today. So tomorrow, there will be
a great need for intelligent heating
technology specifically designed
for refurbished buildings. This is
where Remeha’s advanced thinking
is leading the way to a future where
our highly efficient heating systems
help to improve the overall energy
efficiency of refurbished buildings.
Giving them new life and a more
sustainable future.
The Remeha Gas 210 ECO PRO is a
compact floor standing condensing
boiler. The small footprint and
ability to be installed back to back
makes it ideally suited for modular
configurations. An optional Optimising
Weather Compensating control
package is available to ensure
maximum efficiency. Now also
compatible with Open Therm.
The boilers are suitable for
both new and retrofit applications.
With conventional and room
sealed flue capability they can
be installed in most situations.
Full installation and technical
details can be found in the
Gas 210 ECO PRO Installation
and Service Manual, available
on our website or by contacting
us on 0118 978 3434.
CONTENTS
Introduction 2
Boiler description 2
Boiler construction 3
Efficiency/application
information 3
Advantages at a glance 4
Operating principle 4
Dimensions 5
Technical data 6
Typical installation 7-8
Typical flue installation 9-11
Electrical connections
and controls 12-15
REMEHA GAS 210 ECO PRO
OVERVIEW
BOILER DESCRIPTION
The Remeha Gas 210 ECO PRO boiler is a pre-assembled,
free standing, gas fired, high efficiency condensing boiler.
The sectional cast aluminium heat exchanger and other major
components are contained within a sealed air box. This forms the main
boiler casing with a removable front panel section for maintenance
purposes. All electrical and electronic controls are contained within the
instrument panel mounted on top of the boiler.
The flue gas outlet, combustion air inlet, flow, return and gas connections
are located on the top of the boiler with a condensate connection and
optional return connection at low level on the right hand side.
The boiler is suitable for room sealed or open flue applications and has
been designed for central heating and indirect hot water production at
working pressures not exceeding 6 bar. It must be installed on a fully
pumped pressurised system (minimum operating pressure 0.8 bar).
The pre-mix, down firing gas burner (NG + Propane only) with its gas/air
system ensures clean, trouble free operation with higher than average
efficiencies of 108.6% (NCV) in the condensing mode, combined with ultra
low NO
x and minimum CO
allows actual and set values to be read and adjusted on the built-in digital
display, which also provides normal operating and fault code indication.
An intelligent, advanced boiler control (abc
boiler conditions, varying the heat output to suit the system load. The
control is able to react to external “negative” influences in the rest of the
system (flow rates, air/gas supply problems), maintaining boiler output
for as long as possible without resorting to a lock out condition. At worst
the boiler will reduce its output and/or shut down (shut off mode) awaiting
the “negative” conditions to return to normal before re-starting. The abc
control cannot override the standard flame safety controls.
Every Remeha Gas 210 ECO PRO is checked, following assembly, by
means of a test computer to ensure its proper operation.
The boiler meets the requirements of the EC regulations of the directives:
Reference number 0085BS0132
NOx-Reference number BS004
emissions. The standard control package
2
®
) continuously monitors the
®
REMEHA GAS 210 ECO PRO
OVERVIEW
BOILER CONSTRUCTION
1. Air supply
2. Flue gas outlet
3. Combustion test point (O2/CO2)
4. Sealed air box
5. Differential air pressure switch (LD2)*
6. Venturi
7. Air supply fan
8. Premix, fibre faced burner
9. Combined ignition/ionisation probe
10. Sight glass
11. Gas combi-block
12. Cast aluminium, sectional heat exchanger
13. Temperature sensor - flow*
14. Temperature sensor - return*
15. Temperature sensor - heat exchanger*
16. Temperature sensor - flue gas (option)*
17. Drain pan (condensate)
18. Condensate connection
19. Heat exchanger inspection hatch
20. Instrument panel
21. Facility for incorporating a
weather compensator (optional)
22. Boiler setting keys
23. Read-out display and reset key
24. On/off switch
25. Gas connection
26. Flow connection
27. Return connection
28. Drain cock and optional second return
connection or low level return (option)
*Not illustrated
2622 23
11
27
24
6
2
3
48
19
1
21
10
7
9
12
17
25
20
28
18
ANNUAL EFFICIENCY
Up to 108.6% at Hi (up to 97.8% at Hs) at an average
return water temperature of 30°C (40/30°C).
Heat to water efficiency
a. Up to 98.4% at Hi (88.6% at Hs) at an average
water temperature of 70°C (80/60ºC).
b. Up to 105.7% at Hi (95% at Hs) at an average
water temperature of 40°C (50/30ºC).
Standing losses
On average, 0.21% at Hi (0.23% at Hs) at an average
water temperature of 45°C.
NOTE: NCV = Hi, GCV = Hs
APPLICATION INFORMATION
The Gas 210 ECO PRO can be used on all new and
refurbishment projects in both single and cascade
configurations. Conventional and room sealed flue system
capability means that the boiler can be sited almost
anywhere within a building.
The Remeha range of weather compensators (option) are
able to communicate directly with the boiler controls to
make full use of its fully modulating feature, ensuring that
the boiler closely matches the system demand at all times.
Our range of external control systems can be interfaced with
the boiler to provide on/off or modulating (0-10 V) control
options. For cascade flue arrangements a motorised flue/
gas damper is available as an accessory. The optional
SCU- S01 PCB will also be required.
A key benefit of the Remeha Gas 210 Pro is that it is
Renewable Energy Ready. Most renewable energy products
need to be backed up by a condensing boiler during periods
of peak demand.
The secondary return feature on the Remeha Gas 210 Pro
makes this boiler particularly suitable for use with
renewable energy technologies that use low grade heat
such as heat pumps or underfloor heating circuits.
Bivalent systems such as this combine the best of renewable
and conventional heating technologies to maximise the
seasonal efficiency of the system as a whole over the
course of the year.
45
ADVANTAGES
AT A GLANCE
Compact lightweight construction
High efficiency - 108.6% NCV at
40/30°C (97.8% GCV)
Boiler controls - On/Off High/Low
or Fully modulating over 18-100%
Premix burner for optimum
combustion
Low NOx < 38 expected seasonal
Ultra quiet < 59 dBA
Digital diagnostic display
Remote signalling options
Cast - sectional aluminium
heat exchanger
Easy maintenance
Options for direct weather
compensation
Compatible
with Open Therm
Advanced intelligent (abc®)
control system
Diagnostic PC connection
Conventional or “room sealed”
capability
Supplied fully assembled for
ease of installation
Renewable ready - optional low
level secondary return kit
REMEHA GAS 210 ECO PRO
OVERVIEW
OPERATING PRINCIPLE
Combustion air is drawn into the closed air box through the air inlet from
the plant room (open flued) or from outside via the eccentric flue system
(room sealed) by a variable speed fan.
The inlet side of the fan is fitted with a venturi, where air and gas are
mixed according to a fixed ratio. This ensures precise combustion.
This mixture is initially ignited by the combined ignition/ionisation probe
which monitors the state of the flame. Should the flame be unstable or
not ignite within the pre-set safety time cycle, the controls will (after 5
attempts) shut the boiler down, necessitating manual intervention to reset
the boiler. The digital display will indicate a flashing fault code confirming
the reason for the failure.
The products of combustion in the form of hot flue gases are forced
through the heat exchanger transferring their heat to the system
water (the flue gas temperature is reduced to approximately 5°C above
the temperature of the system return water), then discharged via the
condensate collector, vertically through the 150mm connection to
the atmosphere.
Because of the low flue gas exit temperature there will be a vapour cloud
formed at the flue gas terminal - this is not smoke, simply water vapour
formed during the combustion process.
If the controls allow the flow and therefore return temperature to fall
below dew point (55°C), this water vapour will begin to condense out in
the boiler, transferring its latent heat into the system water, increasing
the output of the boiler without increasing the gas consumption.
Condensation formed within the boiler and flue system is discharged from
the boiler to an external drain via the drain pan/siphon supplied.
The boiler can be supplied, as an option, with a second (fixed temperature)
return connection. This additional connection enables the boiler to make
full use of its condensing ability whilst accepting both fixed and variable
temperature returns from the same system.
Noise level at a distance of 1M from boiler (enclosed version) dB(A)≤59
Environment temperatureºC0 - 40
Colour of casingRAL2002(red) / 7037(grey)
2
3
/h1.82.43.34.3
0
3
/h9.413.018.021.7
0
mg/kWh<33<35<38<37
max. Watt125193206317
Remeha Gas
210 ECO PRO
120
, C13, C33, C43, C53, C63, C83
P
Remeha Gas
210 ECO PRO
160
2H3P
Remeha Gas
210 ECO PRO
20
OVERVIEW
REMEHA GAS 210 ECO PRO
OVERVIEW
TYPICAL INSTALLATIONS
PLEASE NOTE: These layouts do not constitute a
design. Calculations must be carried out to ensure
pipework and pumps are sized to match boiler nominal
flows against system design flow requirements.
Single boiler
Multiple boiler
NOTE: For Firing on LPG, please contact our sales department
89
Single boiler using the optional
2nd return connection (VT)
REMEHA GAS 210 ECO PRO
OVERVIEW
REMEHA GAS 210 ECO PRO
OVERVIEW
TYPICAL FLUE INSTALLATION
(Conventional)
Boiler Model 3 4 5 6
Maximum length ‘L’ 50M 50M 45M 31M
(Using 150mm diameter*)
45˚bend = an equivalent length of 1.2M
90˚bend = an equivalent length of 2.1M
(Using 150mm diameter flue)
Multiple boiler using the optional
2nd return connection (VT)
* For alternative flue diameters and greater overall flueing
distances please consult the technical manual.
Conventional flue with two boilers using
a common header arrangement
NOTE: 2nd return for variable temperature or low level
return in place of high level return
NOTE: Flue calculation must be carried out to confirm
header sizes. Please consult with our technical department.
Maximum length ‘L’ 30M 30M 22M 13M
(Using 150mm diameter*)
45˚bend = an equivalent length of 1.2M
90˚bend = an equivalent length of 2.1M
* For alternative flue diameters and greater overall flueing
distances please consult the technical manual.
45˚bend = an equivalent length of 1.2M
90˚bend = an equivalent length of 2.1M
* For alternative flue diameters and greater overall flueing
distances please consult the technical manual.
CLV flue system with two boilers using a common
flue and air inlet header arrangement
Room sealed eccentric system for two
boilers using the GVRS 250 terminal
NOTE: Flue calculation must be carried out to confirm header size.
Please consult with our technical department.
NOTE: Flue calculation must be carried out to confirm max
lengths. Please consult with our technical depar tment.
1213
REMEHA GAS 210 ECO PRO
ELECTRICAL CONNECTIONS AND CONTROLS
General specifications
The Remeha Gas 210 ECO PRO is supplied as
standard with electronic control and flame
ionisation safety controls, with a specially designed
microprocessor at the heart of the control system.
Power supply
The appliance is suitable for a supply of 230V-1-50Hz
6.3amp with phase/neutral/earth.
NOTE: the controls are phase/neutral sensitive.
Automatic controls
SIT
Type: PCU-01
Electrical supply: 230V -1-50 Hz
Power consumption at standby/part load/full load:
- 3 sections: 4 / 36 / 125 W
- 4 sections: 4 / 37 / 193 W
- 5 sections: 4 / 53 / 206 W
- 6 sections: 4 / 54 / 317 W
Maximum power output to pump: 300 VA.
Fuse specification
The boiler is protected by fuses:
- Fuse F on the 230 V terminal strip 6.3AT
On the control box:
- F1 rated at 1.6 amps (fast acting) - control circuit 230 V
Boiler temperature control
The Remeha Gas 210 ECO PRO has electronic
temperature control with flow, return, heat exchanger
temperature sensors. An optional flue gas safety
switch can be supplied as an optional extra.
High limit temperature protection
The high limit temperature protection device
switches off and locks out the boiler when the flow
temperature exceeds the high limit set point. When
the fault is corrected the boiler can be re-started
by using the reset key on the boiler control panel.
Flue gas differential switch further protects the
boiler against internal flue gas blockages, an E12
fault code will appear to indicate a blockage.
External connections
These are accessed by removing the plastic cover
from the instrument panel, exposing the terminal
strip and electronic components which make
up the boiler controls. All external connections
(power and control) are made on these terminal
strips, as detailed in the following section.
The boiler is supplied with the following
standard control:
Standard (PCU-01)
- On/off control (OT)
- Modulation (OT)
- Open Therm
- External interlock (BL)
- Input release (RL)
- Pump (output)
OVERVIEW
Fitted as standard (IF-01)
- 0-10v control operation
(Temperature or output)
- Connection status (lockout) (NC)
- Open Therm
Optional 0-10 V control PCB (IF-01)
Additional option (SCU-S01)
If required this should be specified
at time of order
- Expanded control/protection PCB
- Gas valve proving
- Low gas pressure
- Flue gas damper
- Hydraulic valve control
- External gas valve control
- Water pressure sensor
- Facility to fit outside sensor
- Operation/failure
signal (NC/NO)
REMEHA GAS 210 ECO PRO
OVERVIEW
NOTE 1: When connecting the interlocks or
communication wires of more than one boiler in
parallel observe and match the connection polarity.
NOTE 2: Unless otherwise stated at the time of
ordering, the boiler will be delivered with the
standard control fitted. Additional options will
be supplied for on-site fitting by others.
Fitted as standard (SCU-X01)
The control PCB SCU-X01 has two potentialfree contacts, which can be set as required.
Depending on the setting, a maximum of
two messages about the status of the boiler
can be transmitted. See table below:
No.C-NOC-NC
0Alarm StandbyAlarm Active
1Alarm inverted = fail safe ActiveAlarm inverted = fail safe Standby
2Burning StandbyBurning Active
3Burning inverted ActiveBurning inverted Standby
4Burning low StandbyBurning low Active
5Burning high StandbyBurning high Active
6Service report StandbyService report Active
7CH-mode StandbyCH-mode Active
8DHW-mode StandbyDHW-mode Active
9CH-pump StandbyCH-pump Active
Low water protection (flow and content)
Provided by monitoring the temperature sensors
in the boiler.
The Remeha Gas 210 ECO PRO is supplied with
low water protection on the basis of temperature
measurement. By modulating back at the
moment that the water flow threatens to fall too
low, the boiler is kept operating for as long as
possible. In the event of low flow (F/R (Δt = 45°C),
the boiler will shut off and not lockout.
NOTE: If the boiler is fired dry, it will go to high
temperature lock out, a flashing failure code will show
on the display (see technical booklet for details).
Standard control PCB (PCU-01) with
safety unit (SU) both fitted as standard
GPS. Min Gas
Pressure 12mbav
Gas Valve Proving
Expanded control/protection PCB (SCU-SO1)
1415
CONTROLS
The boiler is equipped with electronic control
and safety equipment with ionisation flame
protection. The advanced boiler control, abc
is a microprocessor that protects and controls
the boiler. Connect the boiler to the mains
supply in accordance with the local electricity
supplier’s instuctions and IEE regulations.
Boiler control
The heat output of the Remeha Gas 210 ECO
PRO can be controlled as follows:
- Modulating, where the output modulates
between the minimum and maximum
values on the basis of the flow temperature
defined by the modulating controller.
- On/off control, where the heat output modulates
between the minimum and maximum values on
the basis of the flow temperature set in the unit.
This can be combined with an outside sensor
so that the internal heating curve is used.
- Analogue control (0-10 V), where the heat output
or temperature is controlled by a 0-10 V signal,
via the control PCB (IF-01).
Modulating controls general
The modulating nature of the boiler is used to
maximum effect with a modulating controller
based on room and /or outside temperatures. If
the controller demands heat, the boiler supplies
the heat output (providing the flow conditions have
been met). If the controller supplies a calculated
set point flow temperature, the boiler modulates to
this calculated value (providing the flow conditions
have been met.) This increases the number of
operating hours and drastically reduces the
number of starts. Combined with the fixed gas/
air mixture, this results in greater efficiency.
Various types of modulating controls can
be connected, including the following:
®
REMEHA GAS 210 ECO PRO
OVERVIEW
a) iSense controller
The Remeha iSense can be used as an optional
room or room/weather controller providing
optimum start and weather compensation, and
can be mounted in the boiler or a reference room
depending on which control is required.
b) iSense Pro multiple boiler controllers
These controllers provide optimum start, dual
zone weather compensation and priority DHW
(if required). Fit the controller in the boiler.
Connection takes place using the supplied
adapter plate and the supplied interfaces that can
be integrated in the control panel. Refer to the
relevant controller documentation for details.
c) Modulating cascade controller MC4
The MC4 cascade controller (in conjunction with
an iSense controller) is suitable for the modulated
control of 2 to 4 Remeha Gas 210 ECO PRO units
in cascade. This controller is wall-mounted and
communicates according to the OpenTherm
protocol. Several MC4 controllers can be combined
to control more than 4 boilers. Refer to the
relevant controller documentation for details.
Electrical connection options
The boiler comes complete with controls for regulation,
control and protection. These include the main PCB
(PCU-01), a 0-10 V control signal PCB (IF-01) and
an indication PCB SCU-X01 which includes various
modes to indicate the operation of the boiler.
The optional PCB SCU-S01 is not supplied with
the boiler as standard but must be used if the
following controls are used:
- Gas valve proving
- Low gas pressure
- Flue gas damper
- Hydraulic valve control
- External gas valve control
- Water pressure sensor
- Facility to fit an outside sensor
To install or access these PCBs, the plastic cover
must be removed from the control panel. The required
external connections are made on these (optional)
PCBs. Refer to the relevant fitting instructions.
Analogue control (0-10v)
This control can be based on temperature or
heat output. The two controls are described briefly
below. Connect the 0-10 V signal to the interface
input for analogue control. Two formats available:
Analogue temperature-based control (
The 0-10 V signal controls the boiler flow temperature
between 0°C and 100°C. This control modulates
on the basis of flow temperature, where the
heat output varies between the minimum and
maximum values on the basis of the set point flow
temperature calculated by the controller.
Jumper (2) on the interface is used to select either
temperature (
Jumper 2 Input signal (V) Temp.(°C) Description
Analogue input signal for temperature
Analogue output-based control (%)
The 0-10 V signal controls the boiler output between
0% and 100%, where the minimum and maximum
values are limited. The minimum output is linked
to the boiler’s modulation depth. This control
is output modulated, where the output varies
between the minimum and maximum values on
the basis of the value defined by the controller.
Jumper 2 Input signal (V)
%2,0 - 2,2*20 - 22Hysteresis
*Dependent on the minimum modulation dept (fan rotation
speeds setting, pre set 20%)
Analogue input signal for boiler output
1. On/Off control (1 x volt free switched pair)
The heat output modulates between the minimum
and the maximum value based on the set flow
temperature. Terminals OT on PCU 01 (X6).
2. Frost protection
Install the boiler in a frost-free room. The built-in
frost protection system is activated as follows:
Below 7°C the system pump will be switched on if it is
connected to the boiler. Pump terminals on PCU-01(X4).
Below 3°C the boiler will be switched on, but is limited
to a flow temperature of 10°C, when both will switch off.
NOTE: This control function is designed to protect the boiler
only. For full frost protection of the system and building, a
frost thermostat or weather compensator should be used.
) or boiler output (%) control.
0 - 1,50 - 15Boiler off
1,5 - 1,815 - 18Hysteresis
1,8 - 1,018 - 100Desired temperature
Boiler
output (%)
0 - 2,0*0 - 2Boiler off
2,0 - 1,020 - 10 0Desired boiler output
)
Description
REMEHA GAS 210 ECO PRO
OVERVIEW
3. Boiler with frost protection, out of operation
for a long time
Set the controller low, for example to 10°C;
The Gas 210 ECO PRO will now only come into
operation to protect itself against freezing.
To prevent radiators and the system from freezing
in the rooms where there is a risk from frost
(e.g. garage or storage room), a frost thermostat
can be connected to the boiler. The boiler will
then keep the radiators in that room warm.
Safety interlocks
As standard the boiler is supplied with two interlocks,
BL and RL on PCU - 01(x6). BL can be used for:
1. Normal shut down
2. A shut down without frost protection
3. A lock out (wire bridge must be removed to
use this option).
RL can be used to shut down the boiler.
Optional controls
- Boiler gas valve proving system (only models 5 and 6)
- System water pressure sensor
- Outside temperature
- External gas valve control
- Minimum gas pressure switch
- Flue gas damper control
- Hydraulic valve control
System pump
A system pump can be connected to the boiler
(230-1-50 supply max. current rating of 1 amp).
If the system pump requires more than 1 amp
the terminals can only be used to provide a switch
signal to a pump relay.
System water quality
Before operation the system should be thoroughly
flushed and re-filled with mains cold water. As the
heat exchanger is aluminium and water treatment
is considered a minimum pH level of 7, a maximum
pH level of 9 MUST NOT BE EXCEEDED.
For the correct dosage and the suitability of inhibitors
for use with our boilers and for further information
on water treatment or system cleaning we advise
direct contact with a specialist company.
For further information a special document
“Remeha water quality regulations” is available
from us. The regulations mentioned in this
document must be followed.
Blue Efficiency
TreadLightly
ON THE PLANET
CLEANER / GREENER / SMARTER
TreadLightly
ON THE PLANET
The data published in this brochure is base d on the l ates t infor mati on (at date of publication) and may be subje ct to
revision s. We re ser ve the right to c ontinuous development in both d esign and manufactur e, therefor e any changes to the
techn ology or eq uipment emp loyed may no t be retrosp ective , nor may we be ob liged to adj ust earli er supplie s accordin gly.