REMEHA Gas 210 ECO Manual

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• High efciency condensing
boiler with low NOx emission
• Ranges: 8 - 214 kW
Remeha Gas 210 ECO
Technical information
Remeha Gas 210 ECO

Remeha
Gas 210 ECO
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TABLE OF CONTENTS
Preface 4
1 General boiler description 5
2 Construction 6
2.1 Boiler layout 6
2.2 Operation principle 7
3 Technical data and dimensions 8
3.1 Dimensions 8
3.2 Technical data 9
3.3 Quotation specifications 10
3.4 Optional Accessories 10
4 Efficiency information 11
4.1 Annual efficiency 11
4.2 Heat to water efficiency 11
4.3 Standing losses 11
5 Application information 11
6 Control and safety equipment 12
6.1 The instrument panel 12
6.1.1 General 12
6.1.2 Layout of the instrument panel 12
6.1.3 Indication LED’s 13
6.1.4 Manual override (hand/auto or forced
modes ‘high’ and ‘low’) 13
6.1.5 Display of values with more than
two digits 13
6.2 Flow diagram control system 14
6.3 Operating mode (x [[) 16
6.4 Shut-off mode (b XX) 16
6.5 Setting mode user level (X [[) 17
6.5.1 Flow temperature setpoint (!) 18
6.5.2 Pump run on time (@) 18
6.5.3 Boiler control setting (A) 18
6.6 Setting mode service level (only for the
qualified service engineer) (X [[) 19
6.6.1 Low fire start point ($) 20
6.6.2 Boiler output to indicate high fire (%) 20
6.6.3 Maximum output (6) 20
6.6.4 Forced part load and running time
(& en *) 20
6.6.5 Cycling prevention delay-time (() 20
6.6.6 Start and end point for analog signal
(a and B) 20
6.6.7 PWM pump position (C and D) 21
6.6.8 ∆t from control stop point to start
point (E) 21
6.6.9 Maximum flue gas temperature (F) 21
6.6.10 High limit temperature setpoint (G) 21
6.6.11 Modulation start point ∆T (H) 21
6.6.12 Minimum water pressure (I) 21
6.6.13 Adjustments options/accessories (J) 21
6.6.14 Base point internal compensation
slope (L) 21
6.6.15 Boiler type (P) 21
6.7 Read-out mode (X [[) 22
6.8 Failure mode (x [[) (service level) 23
6.9 Counter mode (1, , and .)
(service level) 23
6.9.1 Hours Run 23
6.9.2 Successful ignition attempts 23
6.9.3 Total start attempts 23

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Gas 210 ECO
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7 Installation instructions 24
7.1 General 24
7.2 Delivery, positioning and support surface 24
7.3 Flue gas discharge and air supply 25
7.3.1 General 25
7.3.2 Classification due to discharging
flue gases 26
7.3.3 Material and installation 26
7.3.4 Single boiler conventional flue 26
7.3.5 Single boiler, room sealed flue 27
7.3.6 Different pressure zones 28
7.4 Installation details 29
7.4.1 Condensate discharge 29
7.4.2 Water treatment 29
7.4.3 Safety valve 29
7.4.4 Water circulation 29
7.5 Multiple installation 30
8 Electrical installation 32
8.1 General 32
8.2 Electrical specifications 32
8.2.1 Power supply 32
8.2.2 Automatic Controls 32
8.2.3 Fuse specification 32
8.2.4 Boiler temperature control 32
8.2.5 Low water protection
(flow and content) 32
8.2.6 High limit protection 32
8.2.7 Differential air pressure switch (LD2) 32
8.3 Electrical connections 32
8.4 Boiler control 34
8.5 Safety interlocks 35
8.5.1 Shutdown interlock 35
8.5.2 Lockout interlock 35
8.6 Remaining outputs 36
8.6.1 Analog output 36
8.6.2 Indicating module No.1 36
8.7 Options/accessories 36
8.7.1 Provision for thermostat pocket 36
8.7.2 Water pressure sensor 36
8.7.3 Differential pressure sensor 36
8.7.4 Gas valve proving (only for 120,
160 and 200 kW boilers) 37
8.7.5 Minimum gas pressure switch 37
8.7.6 Indicating module No.2 37
8.8 Remaining connections 37
8.8.1 System pump 37
9 Commissioning 38
9.1 Initial lighting 38
9.2 Shutdown 39
10 Fault-finding 40
10.1 General 40
10.2 Overview malfunctions (locking) 40
11 Inspection and servicing / maintenance
instructions 42
11.1 General 42
11.2 Annual inspection 42
11.2.1 Check combustion characteristics 42
11.2.2 Cleaning the IMS-system 42
11.2.3 Cleaning the siphon 43
11.2.4 Check the adjustment of the ignition
probe 43
11.2.5 Check the water pressure 43
11.3 Maintenance 43

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Gas 210 ECO
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PREFACE
Read these instructions carefully before putting the
boiler into operation, familiarise yourself with its control
functions, operation and strictly observe the instructions
given. Failure to do so may invalidate warranty or pre-
vent the boiler from operating.
The installation and commissioning of the boiler must be
carried out by a competent Engineer, with the relevant
certification i.e.: CORGI, ACOPS, IEE regs. On com-
pletion a copy of the commissioning sheet should be
returned to Broag Ltd. for record purposes.
If you have any questions, or if you need more informa-
tion about specific subjects relating to this boiler or its
installation please do not hesitate to contact us.
The data published in these technical instructions is
based on the latest information (at date of publication)
and may be subject to revisions.
We reserve the right to continuous development in both
design and manufacture, therefore any changes to the
technology employed may not be retrospective nor may
we be obliged to adjust earlier supplies accordingly.
Fig. 01 Artist impression Gas 210 ECO
PD-IL32

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Gas 210 ECO
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1 GENERAL BOILER DESCRIPTION
The Remeha Gas 210 ECO 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
inspection hatch for maintenance purposes. All electrical
and electronic controls are contained within the instru-
ment 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 at low level on the right hand
side.
The boiler is suitable for room sealed or open flue appli-
cations 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
system and is suitable for use on both sealed and open
vented installations (minimum operating pressure open
vented 0.3 bar).
The pre-mix gas burner (NG only) with its gas/air ratio
control system ensures clean, trouble free operation
with higher than average efficiencies 109% (NCV) in
the condensing mode combined with ultra low NOx and
minimum CO emissions. The standard control package
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®’) continu-
ously monitors the 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) maintain-
ing boiler output for as long as possible without resorting
to a lockout condition. At worst the boiler will reduce its
output and/or shutdown (shut off mode) awaiting the
“negative” conditions to return to normal before re-start-
ing.
The ‘abc®’ control cannot override the standard flame
safety controls.
Every Remeha Gas 210 ECO 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:
- 90/396/EEC Gas appliances directive
- 92/42/EEC Efficiency directive
- 89/336/EEC E.M.C. directive
and comply with the following requirements:
- 73/23/EEC Electrical low voltage directive.
CE Reference number : 0063 BL 3264.

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Gas 210 ECO
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2 CONSTRUCTION
2.1 Boiler layout
Fig. 02 Cut away view of Remeha Gas 210 ECO (160 kW model shown)
00.21H.79.00003
1. air supply
2. flue gas outlet
3. combustion test point (O2/CO2)
4. sealed air box
5. differential air pressure switch (LD2)
6. IMS gas-air ratio control
7. air supply fan
8. pre-mix, fibre faced burner
9. combined ignition/ionisation probe
10. sight glass
11. gas combi-block (with governor)
12. cast aluminium, sectional heat exchanger
13. temperature sensor - flow
14. temperature sensor - return
15. temperature sensor - heat exchanger
16. temperature sensor - flue gas
17. drain pan (condensate)
18. condensate connection
19. heat exchanger inspection hatch
20. instrument panel
21. facility for incorporating a rematic® 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
(when fitted)
29. connection for optional thermostat pocket
(for use with external sequence control).

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Gas 210 ECO
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2.2 Operation principle
Combustion air is drawn into the closed air box through
the air inlet from the plant room (open flued) or from out-
side via the eccentric flue system (room sealed) by an
air supply fan.
On the inlet side of the fan is a specially designed
IMS (Integrated Mixing System) gas / air ratio control
unit which takes gas from the combi-block and mixes
it in the correct proportions with the incoming air. This
mechanical mixing system ensures the correct mixture
is delivered to the pre-mix burner at all times.
Depending on demand (under the dictates of flow/
return sensor and other external/internal control inputs)
the ‘abc®’ system determines the boiler output, which
directly controls the volume of mixed gas and air to the
premix burner. 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 requiring
manual intervention to reset the boiler. The digital dis-
play 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 transfering 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 they are discharged via
the condensate collector, vertically through the 150 mm
connection to 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 tem-
perature to fall below dew point (55°C) this water vapour
will begin to condense out in the boiler, transfering 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 con-
densing ability whilst accepting both fixed and variable
temperature returns from the same system. Fig. 01

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Gas 210 ECO
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3 TECHNICAL DATA AND DIMENSIONS
3.1 Dimensions
Fig. 03 View drawings
00.21H.79.00001
Flow connection 80, 115 en 160 kW: 1” BSP (m) ; 200 kW: 1” BSP (m)
Return connection 80, 115 en 160 kW: 1” BSP (m) ; 200 kW: 1” BSP (m)
Gas connection 1” BSP (m)
Condensate connection 32 mm o/d (plastic)
Flue gas connection 150 mm i/d
Combustion air supply connection 150 mm i/d
A Height A 80, 115 en 160 kW: 1290 mm; 200 kW: 1305 mm
Second return connection 1” BSP (m) (optional).

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Gas 210 ECO
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3.2 Technical data
Boiler type
Remeha
Gas 210
ECO - 80
Remeha
Gas 210
ECO - 120
Remeha
Gas 210
ECO - 160
Remeha
Gas 210
ECO - 200
General
Number of sections qty. 3 4 5 6
Casing Colour BS RAL 2002
Boiler control options
(external input, two wire control)
On/off, High/low, Analog 0-10V Communicating
Modulation
Nominal output (80/60°C). min. kW 8 12 16 20
max. kW 80 120 160 200
Nominal output (40/30°C) min. kW 8.9 13.5 18.1 22.7
max. kW 86 129 171 214
Nominal input (GCV / Hs) min. kW 9.3 14 18.7 23.3
max. kW 90.6 135.6 181.1 227
Nominal input (NCV / Hi) min. kW 8.4 12.6 16.8 21
max. kW 81.5 122 163 204
Weight dry kg 130 150 170 200
Noise level at 1m from boiler, room sealed dBA ≤ 57 ≤ 63
Gas and Flue
Inlet pressure gas min. mbar 17
max. mbar 50
Gas consumption (natural gas) m3/h 8.6 12.9 17.2 21.6
NOx-emission mg/kWh < 35
NOx-emission (O2 = 0%, dry) ppm < 20
Residual fan duty Pa 115 100 100 140
Flue gas mass kg/h 137 205 274 343
Water side
Flow temperature max. °C 110
operating °C 20 - 90
Operating pressure - open vented min. bar 0.3
- closed min. bar 0.8
max. bar 6
Water contents liter 12 16 20 24
Water resistance at 11°C ∆t mbar 496 446 536 720
Water resistance at 20°C ∆t mbar 150 135 162 180
Electrical
Main supply V / Hz 230 / 1 / 50
Power consumption min. Watt 68 58 69 75
max. Watt 92 84 110 160
Insulation class IP 20
Table 01 Technical data

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Gas 210 ECO
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3.3 Quotation specifications
Cast aluminium - sectional pre-mix gas fired boiler
- Sectional heat exchanger manufactured from cast
aluminium
- Maximum operating pressure of 6 bar
- Maximum operating temperature of 90°C
- Ultra low NOX (max. 20 ppm, O2= 0%, dry)
- Pre-mix, fully modulating (10-100%) gas burner with
unique IMS gas/air ratio control for maximum efficien-
cy
- Intelligent advanced boiler control ‘abc®’ c/w a com-
prehensive operating, service and fault diagnostic
facility
- No minimum flow requirement
- Available as conventional flue or room sealed opera-
tion
- Capable of remote BMS control (0-10V modulating,
on/off and high/low option)
- Socket for advanced service diagnostics (for PC con-
nection)
- Supplied fully factory assembled and tested
- Powder coated enamel steel casing BS RAL colour
2002
- Sealed air box construction for maximum safety
- Suitable for use with Natural gas
- Supplied as standard with on/off switch, temperature
indication, flow, return, heat exchanger block and flue
gas sensors and hours run indication
- Supplied as standard with indicating module No. 1
lockout indication (Volt free), shutdown indication (Volt
free), boiler on indication (24 Volt AC)
- Efficiencies up to 109% (NCV / Hi)
- Manufactured to ISO 9001
- CE approved.
3.4 Optional Accessories
- Modulating weather-compensated / optimising boiler
controls for single and multiple installations
- Thermostat pocket
- Second return connection
- Water pressure sensor
- Air supply filter c/w air supply connecting piece (for
use during building construction)
- Vertical room sealed terminal c/w air supply connect-
ing piece
- Indicating module No. 2 indicating operation, boiler on
and high fire (Volt free)
- Interface for RS232 connection, modem communica-
tion or communication software (Recom MCBA)
- Interface for communication with several boiler con-
trols
- Special cleaning tool
- Valve leak proving system
- Minimum gas pressure switch.

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Gas 210 ECO
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4 EFFICIENCY INFORMATION
4.1 Annual efficiency
Up to 108.2% at Hi (up to 97% at Hs) at an average
water temperature of 35°C (40/30°C).
4.2 Heat to water efficiency
a. Up to 98% at Hi (88% at Hs) at an average water
temperature of 70°C (80/60ºC).
b. Up to 109% at Hi (98% at Hs) at an average water
temperature of 35°C (40/30ºC).
4.3 Standing losses
< 0.3% at Hi (0.33% at Hs) at an average water tem-
perature of 45°C.
Note: NCV = Hi, GCV = Hs
5 APPLICATION INFORMATION
The Gas 210 ECO can be used on all new and re-
furbishment projects in both single and multiple con-
figurations. Conventional and room sealed flue system
capability means that the boiler can be sited almost any-
where within a building.
The Remeha range of weather compensators (options)
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. External control systems (BMS) can be interfaced
with the boiler to provide on/off - high/low or modulating
(0-10V) control options.

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6 CONTROL AND SAFETY EQUIPMENT
6.1 The instrument panel
6.1.1 General
The boiler is supplied with a standard set of defaults
pre-programmed for normal operation but can be tai-
lored by the Engineer to suit most site conditions. These
values are set and read using the built in control panel
or with a note book computer (with optional software
and interface).
For security the control has three levels of access:
1. User level - free access
2. Service level - access with service code by qualified
personnel
3. Factory level - access by PC with factory code
(Remeha only).
Fig. 04 Instrument panel
00.21H.79.00016
a. code-display
Indicates on user level: operating mode - 1 digit or letter
setting mode - ! digit or letter with dot
read-out mode - ! digit or letter with flashing dot
shut-off mode - letter b
forced full load - letter h
forced part load - letter l
test phase IMS - letter t
Additional indication on service
level:
failure mode - 1 digit flashes
boiler run information mode - successively 1 + , + .
b. t-display
Indicates: temperatures
settings
shut-off codes
lockout codes
c. reset-key: to reset boiler after a lockout
d. m-key: program function: key to select the required mode (mode-key)
6.1.2 Layout of the instrument panel
The instrument panel consists of the following compo-
nents (see Fig. 04 and Table 02):
1. On/off switch
2. PC-connection
3. Facility for incorporating a rematic® weather
compensator.
The functions of keys and displays (letters a - h) are
explained in Table 02.

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Gas 210 ECO
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e. s-key: program function: key to select the required program within the selected mode
(step-key)
f. e-key: program function: key to save the settings (store-key)
g. [+]-key: program function: to select a higher setting
h. [-]-key: program function: to select a lower setting
h. [-]-key held for 2 seconds switch function: manual override (hand/auto)
Table 02 Instrument panel functions
6.1.3 Indication LED’s
The instrument panel has two indicating LED’s.
1. The LED above the [-]-key (in the h-symbol) when
illuminated green confirms the boiler is in manual
override (see par. 6.1.4).
2. The LED above the [+]-key (in the 0-symbol) when
illuminated green confirms that the IMS system is
completely closed (rest position).
6.1.4 Manual override (hand/auto or forced modes
‘high’ and ‘low’)
Some of the keys on the instrument panel have a dou-
ble function.
- Normal function - program input (see par. 6.5 and 6.6)
- Manual override - (during these modes as described
below the flow temperature cannot exceed its pre-set
maximum).
Hand/auto
When the [-]-key is pressed and held for 2 seconds the
boiler will run, even if external controls are not calling for
heat. The green LED above this key (in the h-symbol)
will illuminate indicating manual override.
By pressing and holding for 2 seconds the [-]-key, the
boiler will return to normal (auto control).
Attention: A (system) pump that isn’t connected to
the terminal strip of the boiler control will not be
activated!
Forced mode ‘high’ (h [ÿ)
By pressing the m and [+]-key simultaneously in oper-
ating mode during 2 seconds, the boiler will run at
maximum power. The letter h will now appear on the
display. By pressing the [+]- and [-]-keys simultane-
ously, the boiler will return to operating mode. Following
a manual override the boiler will return to normal (auto
control) if no keys are used within a 15-minute period.
Forced mode ‘low’ (l [[)
By pressing the m and [-]-key simultaneously in operat-
ing mode, the boiler will run at minimum power. The let-
ter l will now appear on the display.
By pressing the [+]- and [-]-keys simultaneously, the
boiler will return to operating mode. Following a manual
override the boiler will return to normal (auto control) if
no keys are used within a 15-minute period.
6.1.5 Display of values with more than two digits
The display has only two digits available therefore val-
ues over this are displayed as follows:
- negative values will be indicated by a dot behind the
last digit e.g. 1) = -10
- values from 00 to 99 will be indicated without any
punctuation marks
- values from 100 to 199 will be indicated by a dot bet-
ween both digits e.g. )0 = 100, !0 = 110,
(9 = 199
- values from 200 to 299 will be indicated by a dot
behind every digit e.g. )) = for 200, !) = 210,
(( = 299
- values over 300 will be indicated by showing the
thousands, hundreds, tens and units in separate alter-
nating pairs.

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Gas 210 ECO
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6.2 Flow diagram control system
press the m-key press the s-key
code-display t-display
Operating mode,
see par. 6.3
only digit or letter
0 - 9, h, l, b, tFlow temperature, shut-off code
Setting mode,
see par. 6.5 and
6.6
digit or letter with dot
!Flow temperature setpoint
@Pump run on time
ABoiler control setting
service engineer level only:
$Low fire start point as percentage
%Boiler output as % to indicate high fire*
^Maximum output
&Forced part load
*Forced part load running time
(Cycling prevention delay-time
aStart point for 0 Volt analogue signal
BEnd point for 10 Volt analogue signal
Cn/a
Dn/a
E∆t from control stop point to start point
Fn/a
GHigh limit temperature setpoint
HModulation start point ∆T
IMinimum water pressure*
JAdjustments options/accessories
Ln/a
PBoiler type, factory set
Read-out mode,
see par. 6.7
digit or letter with flashing dot
!Actual flow temperature
@Actual return temperature
#Actual flue gas temperature
$Actual outdoor temperature (with outside temperature sensor)
%Actual heat exchanger temperature

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Gas 210 ECO
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^Flow temperature (setpoint)
&Actual heat demand status and differential air pressure switch
position
*Actual open to close time IMS
(Requested output
ACalculated or actual output
BStatus IMS
CActual valve position IMS
DActual water pressure*
EActual ∆p over burner and heat exchanger*
FActual fan speed
GActual ionisation level
HMinimum position IMS
Failure mode,
see par. 6.8
digit flashes digits flash
1Failure code (chapter 10)
2Operating mode during failure (par. 6.3)
3Flow temperature during failure
4Return temperature during failure
5Flue gas temperature during failure
6Position of IMS during failure
Counter mode,
see par. 6.9
digit + , + .digits flash
1, ,, .Number of operating hours burner
2, ,, .Number of successful ignition attempts
3, ,, .Total number of start attempts
Table 03 Flow diagram control system
* Note: Only active when optional module / sensor is
fitted.

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6.3 Operating mode (x [[)
During normal operation the code-display shows the
status (position in cycle) of the boiler, with the t-
display indicating the actual flow temperature.
The digits or letters in the code-display have the follow-
ing meaning:
0Standby; there is no heat demand from control system or IMS is moving to maximum
1Pre-purging (12 seconds)
2Ignition
3The burner is firing
5Waiting mode; the fan runs and the boiler waits until sufficient air transport is established (air pressure
switch open or closed)
6Normal control stop during heating:
- flow temperature > setpoint + 5 °C
- flow temperature > desired setpoint modulating control + 5 °C
- flow temperature > 95 °C
7Pump overrun time
bShut-off mode
hForced full load
lForced part load
tTest phase IMS (when no signal is being observed by the control unit: in total 3 attempts before lockout)
Table 04 Operating codes
6.4 Shut-off mode (b XX)
During shut-off mode condition the code-display will
show a b, whilst the t-display indicates the cause
with two flashing dots.
Table below details cause of shut-off mode.
Code Description Cause/control points
b )* Insufficient air transport during pre-purge. After 5 attempts the
boiler will go to lockout code 08 (see par. 10.2).
Check:
- flue gas discharge/air supply for
clogging
- air pressure switch and connec-
tions.
B @$ Return temperature is higher than flow temperature. If the boiler
registers a higher return temperature than flow, it will modulate to
minimum setpoint and run for 10 minutes. If return temperature
remains higher than the flow the boiler will shutdown and wait for
return temperature to fall below flow temperature.
- flow and return sensors wiring
reversed
- flow and return connections
reversed.
B @% Flow temperature rate of rise exceeded. The boiler will shut-off
for ten minutes, then restart. Should the rate of temperature rise
remain the same after 5 start attempts (within one heat demand
cycle), this code will be recorded as a shutdown failure and cycle
repeated.
Check:
- system full of water and under
pressure
- pumps are running
- water flow through the boiler.
B @^ If minimum gas pressure switch is connected (option) and pres-
sure is below minimum setpoint. Boiler shuts down for 10 min-
utes. The boiler will try again, if gas pressure is still below mini-
mum it will shutdown again and repeat the cycle until pressure is
re-instated.
- check gas supply
- is gas valve open?
- check set value of the gas pres-
sure switch
- check wiring.

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Gas 210 ECO
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B #) Flow / return ∆t factory-set maximum exceeded. The boiler will
shut off for 150 seconds, then restart. Should the ∆t conditions
remain the same after 20 attempts (within one heat demand
cycle), this code will be recorded as a shutdown failure and the
cycle repeated.
Check:
- system full of water and under
pressure
- pumps are running
- water flow through the boiler.
B $# One or several adjusted parameters out of range including some
factory defaults that should not have been changed.
Reset parameters.
Press the reset-key directly fol-
lowed by pressing and holding the
m-key for 5 seconds.
Code display shows P.
Enter correct boiler type param-
eter, see table in par. 6.6.
B %@ Maximum flue gas temperature setpoint is exceeded. Boiler shuts
down for 150 seconds, then restarts. This cycle is repeated if nec-
essary.
When boiler exceeds maximum flue gas temperature with 5°C,
the boiler will go to lockout code 52 (see par. 10.2).
Check:
- the flue gas temperature set-
point
- the gas/air settings
- if the heat exchanger is clean.
B ^@ If water pressure sensor is connected (option) and pressure is
below minimum setpoint. Boiler will shutdown and restart only if
water pressure is re-instated.
Check:
- system pressure
- minimum water pressure set-
point
- sensor
- wiring.
B ** External interlock has opened. When the interlock closes, the
control stop or shut-off mode is cancelled.
Cancel the shut-off by removing
the cause.
B ($ Heat exchanger and flow temperature ∆t is exceeded (5°C). Boiler
shuts down for 10 minutes then restarts. Should the conditions
remain the same after 5 successive attempts within one heat
demand cycle, this code will be recorded as a shutdown failure
and the cycle repeated.
Check:
- system full of water and under
pressure
- pumps are running
- water flow through the boiler.
Table 05 Shut-off codes
Note: Shut-off mode is a normal boiler operating
function and does not represent a boiler failure.
However, this may indicate a system problem or an
incorrect parameter setting.
6.5 Setting mode user level (X [[)
Code Description Setting range Preset
!Flow temperature setpoint 20 - 90ºC 80
@Pump run on setting 00 = pump run on 10 seconds
01 - 15 = pump run on in minutes 03
99 = continuous pump operation
ABoiler control setting Control mode (modulating-on/off-etc.) 31
Table 06 Settings mode user level
Note: Changing @ and A should only be on design
engineers advice.

Remeha
Gas 210 ECO
18
19
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6.5.1 Flow temperature setpoint (!)
The required flow temperature is adjustable from 20 to
90ºC (factory setting 80°C).
The following diagram shows a typical example of this
procedure:
Fig. 05 Adjusting maximum flow temperature
6.5.2 Pump run on time (@)
Pump run on time can be adjusted (Please refer to
installation contractor).
- Press the m-key until the digit ! (with dot) appears in
the code-display.
- Press the s-key until the digit @ (with dot)
appears in the code-display.
- Set the required value, using the [+]- and [-]-keys.
- Press the e-key to store the new value (value will
flash twice).
- Press the reset-key to return to operating mode.
Code tDescription
@ 00 Pump runs on for 10 seconds
@ xx Pump runs on for 1 to 15 minutes
(xx = 01 to 15)
@ 99 Continuous pump operation
Table 07 Adjustments pump run on time
6.5.3 Boiler control setting (A)
The boiler is factory set to option 31 (On/Off-modulation
with heating On).
To change the control option:
- Press the m-key until the digit ! (with dot) appears in
the code-display.
- Press the s-key until the digit A (with dot)
appears in the code-display.
- Set the required value, using the [+]- and [-]-keys.
- Press the e-key to store the new value (value will
flash twice).
- Press the reset-key to return to operating mode.

Remeha
Gas 210 ECO
18
19
Code tDescription
A x0 Heat demand off x = 1, 2, 3, 4 or 5
x1 Heat demand on x = 1, 2, 3, 4 or 5
1y On/off, modulating on flow temperature with booster function y = 0 or 1
2y High/low, modulating on flow temperature y = 0 or 1
3y On/off, modulating on flow temperature without booster function y = 0 or 1
4y Analog signal 0-10V on temperature y = 0 or 1
5y Analog signal 0-10V on output % y = 0 of 1
Table 08 Boiler control setting
Note: Booster function n/a
6.6 Setting mode service level (only for the qualified
service engineer) (X [[)
To prevent accidental, unauthorised access by non-qual-
ified persons the control system requires an input code
to gain access to the second level of boiler control.
- Press the m- and s-keys simultaneously and hold.
The code-display now shows a letter c with a ran-
dom number in the t-display.
- While holding both keys pressed, set the t-display
to 12, using the [+]- or [-]-keys and press the e-
key.
- The display will flash twice, confirming acceptance of
the access code.
- Release the keys and c12 will dissappear from
the display.
You are now in the service mode.
WARNING: changing the pre-set values without
reference to the tables contained in this manual may
result in incorrect boiler operation.
- The service settings can now be reached by pressing
the m-key until the digit ! (with dot) appears in the
code-display. Set the required value, using the s-
key.
- To delete the service code, press the reset-key once.
- If no keys are pressed over a 15-minute period the
service code will delete automatically.
Code Description Setting range Pre-set
$Low fire start point, par. 6.6.1 00 - )0 (=100) (% output) 50
%Boiler output to indicate high fire, par.
6.6.2
00 - )0 (=100) (%) 90
^Maximum output, par. 6.6.3 50 - )0 (=100) (%) )0 (=100)
&Forced part load, par. 6.6.4 10 - 50 (% output) 30
*Forced part load running time, par.
6.6.4
00 - 30 (x 10 sec.) 02 (80 kW) and
01 (120 kW, 160 and
200 kW)
(Cycling prevention delay-time, par.
6.6.5
00 - 30 (x 10 sec.) 02 (=20 s.)
aStart point for 0 Volt analog signal,
par. 6.6.6
5) (=-50) - 50 (°C) 00
BEnd point for 10 Volt analog signal,
par. 6.6.6
50 - (( (=299) (°C) )0 ( =100)
Cn/a, par. 6.6.7 10 - )0 (=100) (%) )0 (=100)
Dn/a, par. 6.6.7 10 - )0 (=100) (%) 30
E∆t from control stop point to start
point, par. 6.6.8
05 - 20 (°C) 10
FMaximum flue gas temperature, par.
6.6.9
80 - @0 (=120) (°C) @0 (=120)

Remeha
Gas 210 ECO
20
21
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5 6 7 8 9 10
input voltage (V) - DC
desired flow temperature (°C)
GHigh limit temperature setpoint, par.
6.6.10
90 - !0 (=110) (°C) !0 (=110)
HModulation start point ∆T, par. 6.6.11 10 - 30 (°C) 25
IMinimum water pressure, par. 6.6.12 00 - 60 (x 0,1 bar) 08 (=0,8)
JAdjustments options/accessories, par.
6.6.13
00 - 15 (see Table 10) 00
Ln/a, base point internal compensation
slope, par. 6.6.14
15 - 60 (°C) 20
PBoiler type, factory set, for reference
only, par. 6.6.15
Gas 210 ECO, 80 kW : 10
Gas 210 ECO, 120 kW : 20
Gas 210 ECO, 160 kW : 30
Gas 210 ECO, 200 kW : 40
Dependent of boiler type
Table 09 Settings service level
6.6.1 Low fire start point ($)
Adjustable from 0 to 100%, factory setting 50%.
The value relates to the low fire output setpoint in per-
cent of total.
Note: Only active when boiler control option 21 is
choosen: high/low, modulating on flow temperature, see
par. 6.5.3.
6.6.2 Boiler output to indicate high fire (%)
Adjustable from 0 to 100%, factory setting 90%.
This value sets the point (in %) which indicates the
boiler is at high fire.
Note: Only active when optional Volt free module No. 2
is fitted.
6.6.3 Maximum output (6)
Adjustable from 50 to 100% output, factory setting
100%. This value sets the maximum output of the boiler.
6.6.4 Forced part load and running time (& en *)
Forced part load, parameter &, adjustable from 10 to
50% input, factory setting 30%.
This value will force the boiler to always start at this per-
centage i.e. 30%.
Forced part load running time, parameter *, adjustable
from 0 - 300 sec., factory setting 20 sec. for the 80 kW
boilers and 10 sec. for the 120 and 160 kW boilers.
This value sets the time the boiler stays on forced start
level i.e. 20 sec.
Note: If both values are set to 0 or if the time period
expires the boiler will revert to what ever the system is
demanding.
6.6.5 Cycling prevention delay-time (()
Adjustable from 0 and 300 sec., factory setting 20 sec.
This value sets a minimum off time following a control
stop / end of a heat demand to prevent cycling taking
place. When after this delay time flow temperature lies
less than 5°C above return temperature (check on water
flow), the boiler will restart.
6.6.6 Start and end point for analog signal
(a and B)
Start point (0 Volt): parameter a, adjustable between
-50°C and +50°C, factory setting 0°C.
This value sets the required flow temperature at 0 volt
signal input (restricted by the min IMS setpoint).
End point (10 Volt), parameter B, adjustable between
+51°C and +299°C, factory setting 100°C.
This value sets the required flow temperature at 10 volt
signal input (restricted by the maximum flow tempera-
ture setpoint and the maximum output).
Note: These settings are only applicable when param-
eter 41 is chosen for the boiler control operation.
Fig. 06 Temperature control via analog (0-10 Volt)
signal