STOKVIS ENERGY SYSTEMS ECONOFLAME R2700 Owner's manual
ECONOFLAME R2700/R2800/R2900
GAS FIRED CONDENSING BOILERS
INSTALLATION, OPERATION & MAINTENANCE
DOCUMENTATION
STOKVIS ENERGY SYSTEMS
96R WALTON ROAD
EAST MOLESEY
SURREY
KT8 0DL
TEL: 020 8783 3050 / 08707 707 747
FAX: 020 8783 3051 / 08707 707 767
E-MAIL: [email protected]
WEBSITE: www.stokvisboilers.com
2789CV02B 180504
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2789CV02C XIII
TABLE OF CONTENTS
R2700 Technical data ........................III
Dimensions R2700 .......................... IV
R2800 Technical data ....................... VI
Dimensions R2800 .......................... VII
R2900 Technical data ....................... IX
Dimensions R2900 ........................... X
Table of contents .......................... XIII
1 INTRODUCTION ............................ 1
1.1 Stokvis Energy Systems. ...................... 1
1.2 Supplier ................................... 1
1.3 Thisdocument .............................. 1
1.4 Service.................................... 2
1.5 General restrictions .......................... 2
2 DESCRIPTION ............................. 3
2.1 General ................................... 3
2.2 Main components ............................ 5
2.2.1 Description of principal components ............. 6
2.3 Boilercontrol ............................... 8
2.4 Safetyaspects .............................. 8
3 SAFETY................................... 9
4 DELIVERY AND TRANSPORT ................ 12
4.1 Delivery .................................. 12
4.2 Packaging ................................ 12
4.3 Transport ................................. 12
5 INSTALLATION............................ 17
5.1 Regulations ............................... 17
5.2 Boilerroom................................ 17
5.2.1 General .................................. 17
5.2.2 Setup ................................... 17
5.2.3 Ventilation ................................ 19
5.3 Connections ............................... 19
5.3.1 Gas connection ............................ 19
5.3.2 Electrical connection ........................ 19
5.3.3 Waterconnections.......................... 25
5.3.4 Combustion air supply ....................... 26
5.3.4.1 General .................................. 26
5.3.4.2 Air supply pipe ............................. 26
5.3.5 Thefluesystem ............................ 28
5.3.5.1 General .................................. 28
5.3.5.2Chimney.................................. 30
5.3.6 Condensate discharge ....................... 35
2789CV02C
XIV
5.4 Hydraulicsystem ........................... 36
5.4.1 General .................................. 36
5.4.2 Waterflow ................................ 37
5.4.2.1 Flow rate and resistance ..................... 37
5.4.2.2Pumpcharacteristics ........................ 39
5.4.2.3Isolatingvalves ............................ 40
5.4.2.4Valves ................................... 40
5.4.2.5Waterflowprotection........................ 40
5.4.3 Waterpressure ............................ 40
5.4.3.1Operatingpressure ......................... 40
5.4.3.2 Boiler expansion tank ........................ 41
5.4.3.3Systemexpansiontank ...................... 41
5.4.3.4 Water pressure protection .................... 41
5.4.4 Watertemperature.......................... 41
5.4.5 Waterquality .............................. 41
5.4.6 Examplesofhydraulicsystems ................ 43
6 OPERATING INSTRUCTIONS ................ 48
6.1 Function.................................. 48
6.2 Regulation ................................ 48
6.3 Controlmodule............................. 49
6.4 Faultindications............................ 51
6.5 Start-up .................................. 52
6.6 Shut-down ................................ 52
6.7 Warnings ................................. 53
7 COMMISSIONING.......................... 54
7.1 General .................................. 54
7.2 Commissioning ............................ 54
8 MAINTENANCE ........................... 57
8.1 Safety.................................... 57
8.2 General .................................. 57
8.3 Procedure ................................ 57
8.4 Cleaning the burner and heat exchangers ........ 58
8.5 Cleaning the filter/screen in the gas
combinationblock .......................... 59
8.6 Ionisationmeasurement...................... 59
8.7 Replacing the frequency Inverter ............... 59
8.8 Service................................... 60
9 CONVERSION FORMULAE AND FACTORS ..... 61
SUPPLEMENT
Edition 2789CV02C, 15-06-2001
© 2001 Stokvis.
2789CV02C 1
1 INTRODUCTION
1.1 Stokvis Since its beginning in 1985, Stokvis has built
up a strongreputation in industryfor the development, produc-
tion and marketing of gas-fired, high efficiency boilers and
ISO9002 water heaters in the 60 to 1200 kW range.
1.2 Supplier STOKVIS ENERGY SYSTEMS.
1.3 This document This documentation has been to aid the following target
Through their unique construction, these central heating units
and water heaters are renowned for their:
- high thermal efficiency
- environmental friendliness
- light weight and small dimensions
- durability
- low noise production
- large regulating range
- available with many different options.
Continual research and development means that Stokvis
remains at the forefront of boiler technology.
96R Walton Road,East Molesey
Surrey KT8 0DL
Tel.: 08707 707 747
Fax: 08707 707 767
groups:
- the consulting engineer
- the heating installer
- the service engineer
- the user
Because these target groups require mostly similar information
and also specific information, our technical documentation has
been integrated to provide these target groups with the neces-
sary general and specific information to install, service and
operate this product.
The supplier (see 1.2) will be able to provide any further or
supplemental information.
2789CV02C
2
1.4 Service The Stokvis service departmentisalways
1.5 General restrictions The application, installation and maintenanceof Stokvis
The following aspects of the units are dealt with:
- General description
- Technical specifications
- The facilities necessary for design and installation
- Installation examples
- Maintenance instructions
The operating instructions needed by the user are attached to
the unit; these are also to be found in Section 6.
available for commissioning and for providing service and
maintenance. For details see 1.2.
products must alwaysbe carried out in accordance
with the requirements (legal or otherwise), specifications and
standards applicable to such installations.
Alldata, information and suggestions provided by Stokvis
in relation to its products are based on careful
investigation. Nevertheless, neither Stokvis
nor any other organisation connected with Stokvis
accepts any liability for application, installation that occurs
outside its sphere of influence.
Changes may be incorporated without prior notice.
Stokvis accepts no obligation to adapt
previously delivered products to incorporate such
changes.
2789CV02C 3
2 DESCRIPTION
2.1 General The Econoflame R2700/R2800/R2900 are environmentally
The R2700/R2800/R2900 series have CE approval for all
friendly modulating gas fired heating boilers that can vary its
output from 25 % to 100 % of its maximum capacity.
The R2700 series consists of 10 models in a range from 95 to
597 kW. The R2800 series consists of 10 models in a range
from 95 to 553 kW. The R2900 series consists of 10 models in
a range from 96 to 566 kW.
The units have an extremely low emission of NO and CO, so
x
that this boiler satisfies the most stringent European require-
ments.
relevant European countries. The series are registered under
the product identification number 0063AQ6600.
The boilers can be supplied either as a standard (category B23)
or a room sealed (categories C53, C33 or C63) appliance.
Working principle and construction
Air is blown into the appliance, as required, by a speed-con-
trolled fan and thoroughly mixed with gas in the correct propor-
tions.
A temperature controller compares the desired water tempera-
ture with the temperature of the water flow and sends a signal
to the frequency converter to maintain the correct heating
capacity.
The gas/air mixture so formed is passed through a cooled
premix burner and ignited. The premix burner is constructed of
finned bimetallic pipes (internally from stainless steel and
externally from aluminium) with cast iron water headers.
Heat transfer takes place in two or three heat exchangers. The
first heat exchanger is constructed from smooth stainless steel
pipes, while the second heat exchanger is fitted with laser
welded, stainless steel finned pipes. Both heat exchangers are
fitted with cast iron profiled water distribution components
(headers) which guarantee an optimum water flow through the
appliance.
The burner and the heat exchangers are connected in series.
At the R2900 a third heat exchanger is attached wich consists
of one or more stainless steel fin tube(s), switched in series, in
form of a spiral. It is arranged on the back of the boiler on the
flue gas collection chamber.
2789CV02C
4
Fig. 4 The Econoflame R2900
The boiler pump ensures the water flow quantity. The third heat
exchanger is switched parallel to the boiler and has a flow of
5 - 10 % of the entire water flow.
The R2700/R2800/R2900 units have a small water capacity so
that it can rapidly adjust to changing conditions. It can be in-
stalled without any restrictions to the return water temperature.
The necessary water flow rate is ensured by the standard pump
delivered with the appliance.
Application possibilities
Because of its construction, the R2700/R2800/R2900 unit is
suitable for use in heating systems:
- With a constant supply temperature
- With a weather dependent heating demand
- With low temperature condenser systems
- With optimised condensation
- With control by means of building optimizer/compensator
system (0 – 10 Vdc = +2 °C – +90 °C), see 5.3.2 connection
terminals).
*
* The R2700 and R2800 are identical with the exception of the third heat exchanger.
2789CV02C 5
Fig. 5 General survey
2.2 Main components 1 Return connection 19 Flue gas collection chamber
2 Flue gas discharge R2900 or 20 Combustion chamber
flue attenuator R2700 and R2800 21 Electrical cable duct
3 Water flow switch 22 Condensate discharge
4 Safety valve 23 Inspection opening
5 Inlet connection 24 Gas valve unit
6 Filling/drainage valve 25 Fan
7 Cover 26 Connection box
8 Distribution plate 27 Control panel
9 Burner 28 Casing
10 First heat exchanger 29 Air inlet damper
11 Gas filter 30 Butterfly valve
12 Second heat exchanger 31 Mixing chamber
13 Gas train 32 Boiler pump
14 Frame
15 Water circulation piping A Air
16 Flue gas discharge B Gas
17 Third heat exchanger R2900 C Flue gas
18 Condensate collection tank D Condensate
2789CV02C
6
2.2.1 Description of The boiler is constructed from the following principal compo-
principal components nents:
Fan [25]
This consists of a fan casing, a fan impeller and an electric
motor. The fan sucks in combustion air and increases the air
pressure.
Air inlet damper [29]
A specially developed air inlet damper ensures a low noise
level. As an option, this can be provided with an air filter or with
an air inlet opening so that the appliance can function as a
room sealed appliance.
Gas train [13]
The principal component of the gas train is the main gas
valve/proportional pressure regulator [24]. The quantity of gas
is adjusted in proportion to the quantity of air being supplied.
The quantity of air depends on the speed of the fan. The unit is
fitted with a gas filter [11] as standard.
Mixing chamber [31]
This area is used for the thorough mixing of the gas and the
combustion air.
Burner [9]
After the gas/air mixture has been distributed over the burner
with the aid of a distribution plate [8], the mixture is burned on
the surface of the burner in such a way that the flame is di-
rected downward. The burner is air and water cooled. The
water distribution components are made from cast iron and
have a profile that ensures that an optimum distribution and
flow are obtained.
Heat exchangers [10, 12 and 17]
The primary heat exchanger [10] is constructed from smooth
stainless steel tubes. These transfer most of the heat energy to
the system water. The secondary heat exchanger [12], which
consists of laser welded stainless steel finned tubes, transfers
the remaining heat from the flue gasses to the system water. All
the water distribution components are constructed from cast
iron and have a profile that ensures that optimum distribution
and flow are obtained. The space between the burner and the
secondary heat exchanger forms the combustion chamber.
At the R2900 a third heat exchanger [17] is attached wich
consists of one or more stainless steel fin tube(s), switched in
series, in form of a spiral. It is arranged on the back of the
boiler on the flue gas collection chamber.
Other manuals for ECONOFLAME R2700
1
This manual suits for next models
2
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