Viadrus GARDE G 42 ECO Instruction Manual

Hercules U26
Návod k obsluze
VIADRUS GARDE G 42 ECO
MANUAL FOR BOILER OPERATION
AND INSTALLATION

Table of contents page
1. Manufactured boiler variants..................................................................................................................... 3
1.1 Purchase order................................................................................................................................. 3
2. Boiler use and advantages ....................................................................................................................... 5
3. Technical data of boiler............................................................................................................................. 6
4. Boiler construction .................................................................................................................................... 9
5. Regulation............................................................................................................................................... 14
5.1 Control, safety and regulation elements......................................................................................... 14
5.1.1 Equitherm regulation.................................................................................................................. 14
5.2 Electric wiring diagrams ................................................................................................................. 16
6. Circulation pumps ................................................................................................................................... 28
7. Stack hot service water heaters.............................................................................................................. 28
7.1 Technical data of recommended hot service water heaters .......................................................... 28
7.2 Heater construction........................................................................................................................ 29
7.3 Honeywell V 4044F three-way valve technical data ...................................................................... 31
8. Combustion products forced draw-off mechanism ................................................................................. 31
9. Positioning and installation ..................................................................................................................... 33
9.1 Regulations and directions............................................................................................................. 33
9.2 Positioning possibilities .................................................................................................................. 35
10. Delivery and assembly........................................................................................................................ 36
10.1 Delivery and accessories ............................................................................................................... 36
10.2 Assembly procedure....................................................................................................................... 37
11. Commissioning- instructions for contractual service organization ..................................................... 40
11.1 Verification activities before commissioning................................................................................... 40
11.2 Commissioning............................................................................................................................... 40
11.3 Boiler heat output setting and adjustment...................................................................................... 41
11.4 Boiler conversion from „propane“ to „natural gas“ ......................................................................... 44
11.5 Boiler conversion from “ natural gas” to „propane“ ........................................................................ 44
12. Boiler operation by user...................................................................................................................... 45
13. IMPORTANT WARNINGS.................................................................................................................. 47
14. Maintenance ....................................................................................................................................... 48
15. Instructions for disposal of product after its service life expiration..................................................... 48
16. Defects and their elimination (rectification) ........................................................................................ 49
17. Guarantee and liability for defects...................................................................................................... 50

3
Dear customer
We thank you that you have bought the VIADRUS GARDE G 42 gas boiler thus having shown your
confidence in VIADRUS a.s.
For you to get used to a correct way of handling your new product from the beginning please read at
first this manual for its usage (first of all the chapter no. 12 – Boiler operation by user and chapter
no. 13 – Important warnings). Please follow the undermentioned information especially the
prescribed annual inspections carried out by a professional firm in order to guarantee a long-time
and trouble-free boiler operation to both your and our satisfaction.
1. Manufactured boiler variants
1.1 Purchase order
In the purchase order it is necessary to define following data:
Purchase order specifi
cation code
G 42 X X X X X X X
Tab.no.1a): Manufactured variants
Basic boiler
variants
Size Fuel
Combust.
products
outlet Gas valve Regulation Burner
Design
X
X
X
X
X
X
X
Z
P
0
V
1
2
0
1
6
7
8
9
K
S
H
NG boiler
2 – stage gas
valve
2 sect.
3 sect. x x x x x x x x x x x x
4 sect. x x x x x x x x x x x x
5 sect. x x x x x x x x x x x x
6 sect. x x x x x x x x x x x x
7 sect. x x x x x x x x x x x x
NG boiler
1 – stage gas
valve
2 sect. x x x x x x x x
3 sect. x x x x x x x x x x x x
4 sect. x x x x x x x x x x x x
5 sect. x x x x x x x x x x x x
6 sect. x x x x x x x x x x x x
7 sect. x x x x x x x x x x x x
Propane boiler
1 – stage gas
valve
2 sect. x x x x x x x x
3 sect. x x x x x x x x x x x x
4 sect. x x x x x x x x x x x x
5 sect. x x x x x x x x x x x x
6 sect. x x x x x x x x x x x x
7 sect. x x x x x x x x x x x x
Note.: 2° boiler with indoor thermostat (CM 707)can be equipped with outdoor thermostat type 95001.
1
: 1 – stage
gas valve
2: 2 – stage
gas valve
Z
: natural gas
P: propane
0
: not forced
comb.
products
draw-off
V: forced comb.
products
draw-off
Regulation
:
0: standard delivery
1: space thermostat CM 707
(optionally the pump thermostat, the outdoor
thermostat type 95001)
6: regulation A1
7: regulation A2
8: regulation A3
9: regulation A4
Regulation is delivered in a separate packing,
the connection must be done in place of boiler
installation.
2
: 2 sect.design
3: 3 sect.design
4: 4 sect.design
5: 5 sect.design
6: 6 sect.design
7: 7 sect.design
S
: SIT
H: Honeywell
K
: atmospheric burner with
circular burner tubes

4
Purchase order specification code
G 42 ECO X X X X X X X
Tab.no.1b): Manufactured variants
Basic boiler
variants
Size Fuel
Combust.
products
outlet Gas valve
Regulation Burner Design
X
X
X
X
X
X
X
Z
P
0
V
1
2
0
1
6
7
8
9
T
F
S
H
NG boiler
2 – stage gas
valve
2 sect.
3 sect. x x x x x x x x x x x x
4 sect. x x x x x x x x x x x x x
5 sect. x x x x x x x x x x x x x
6 sect. x x x x x x x x x x x x x
7 sect. x x x x x x x x x x x x x
NG boiler
1 – stage gas
valve
2 sect. x x x x x x x x
3 sect. x x x x x x x x x x x x
4 sect. x x x x x x x x x x x x x
5 sect. x x x x x x x x x x x x x
6 sect. x x x x x x x x x x x x x
7 sect. x x x x x x x x x x x x x
Propane boiler
1 – stage gas
valve
2 sect. x x x x x x x x
3 sect. x x x x x x x x x x x x
4 sect. x x x x x x x x x x x x
5 sect. x x x x x x x x x x x x
6 sect. x x x x x x x x x x x x
7 sect. x x x x x x x x x x x x
1
: 1 – stage gas
valve
2: 2 – stage gas
valve
Z
: natural gas
P: propane
0
: not forced
comb. products
draw-off
V: forced comb.
products draw-
off
Regulation
:
0: standard delivery
1: space thermostat CM 707
(optionally the pump thermostat, the outdoor
thermostat type 95001)
6: regulation A1
7: regulation A2
8: regulation A3
9: regulation A4
Regulation is delivered in a separate packing, the
connection must be done in place of boiler installation.
2
: 2 sect.design
3: 3 sect.design
4: 4 sect.design
5: 5 sect.design
6: 6 sect.design
7: 7 sect.design
S
: SIT
H: Honeywell
T
: Třinec low-emission burner
F: low-emission burner Furigas

5
upper part of
boiler shell
panel
reservoir for
thermometer
sensor, boiler and
safety thermostat
(pump
thermostat)
frontal part of
boiler shell
shade
gas valve
automatics
burner plate with
insulation
ignition pilot
burner
burner nozzle
2. Boiler use and advantages
Cast-iron sectional gas boiler VIADRUS GARDE G 42 or G 42 ECO (only generally G 42 hereinafter)
equipped with atmospheric burner is designated for combustion of low-pressure natural gas and propane.
The boiler is manufactured in design B
11BS
, it means it is equipped with combustion products return flow
fuse. The two and three sectional size is suitable for heat sources reconstructions in individual flat units and
for smaller housing and recreation facilities. The bigger sizes suit the demands on heating the houses,
shops, schools etc.
The boiler is only manufactured in hot water design with forced circulation and working overpressure up to
400 kPa (4 bar). Before dispatch it is checked for tightness by test overpressure 800 kPa (8 bar); it stands
the insulation and transient resistance tests.
If you require preferential heating of hot service water you can order separately stationary VIADRUS
OV 100L heater the design of which corresponds to VIADRUS GARDE G 42 boiler
By its electric connection the boiler is adjusted to the connection of the stack hot service water heater
ensuring the service water preferential heating.
The low-temperature cast-iron boiler VIADRUS by its top quality construction of cast-iron sections reduces
the condensation thus also the danger of low-temperature corrosion.
The heating (convection) surfaces of the boiler drum achieve a high use of heat contained in combustion
products. Thanks to the use of high quality cast-iron the boiler is able to transfer the absorbed heat
maximally to the heating water, this evenly to all parts of boiler.
The heating water needn’t be kept at a temperature above 50 °C because at the temperatures of return
water about 30 °C this boiler isn’t damaged by low-temperature corrosion.
In boiler construction there is fully used the empiric knowledge in boilers operation under our climatic
conditions when especially in the transient time of heating season the boilers happen to be operated at a
lower heating temperature. This operation on one hand increases the boiler efficiency but the other hand it
increases the risk of exchanger low- temperature corrosion.
At VIADRUS GARDE G 42 boiler this economical operation does not generate any negative effects either.
Fig. no. 1 Boiler diagram
combustion
products outlet to
chimney
built-in draught
diverter
combustion
products return
flow fuse
automatic
bleeder valve
heating water
outlet
iron boiler drum
gas supply
burner
boiler base

6
Boiler advantages:
1. A high operating liability and long service life thanks to high quality grey cast iron with lamellar graphite.
2. Top quality construction of cast-iron sections with reduced weight compared to previous versions, which
reduces the condensation occurrence thus the danger of low-temperature corrosion.
3. Economical low-temperature operation without condensation occurrence.
4. High boiler efficiency up to 93 %.
5. Regulation and safety elements reliability.
6. Equipped with combustion products return flow fuse which in case of an insufficient chimney draught
shuts down the boiler thus increasing the boiler safety.
7. Possibility to connect some of offered superior regulations according to the customer´s demand on the
heating comfort level.
8. Two-stage boiler working regime by means of HIGH-LOW coil.
9. Low contents of pollutants in combustion products (VIADRUS GARDE G 42 ECO) is deeply below the
values set by MŽP 05-97 „ Environmentally friendly product“ Direction „ and it meets the requirements
set by the most strict European standards like the “Blue angel “ limits.
10. A high combustion space enables a clean flame burnout.
11. When using the pump thermostat there is watched the minimum boiler water temperature.
12. The boiler enables to connection to stack hot service water heater and guarantees its preferential
heating.
13. Simple operation and maintenance. The boiler drum can be easily cleaned mechanically by using the
enclosed brush.
14. The boiler can also be installed in the spaces where connection to chimney is impossible if there is
mounted the combustion products ventilator that enables the combustion products drawing-off into
outdoor air directly through the enclosure wall.
3. Technical data of boiler
Tab. no. 2 Dimensions, operating temperatures a electrical values of boiler
Number of sections
pc
2
3
4
5
6
7
Boiler design
B
11BS
in NG
propane design
Appliance category
II
2H3P
Heat output (G 42 ECO) - natural gas kW 8 12-17 18-26 27-34 35-41 42-49
Heat output (G 42 ECO) - propane kW 7 14 22,5 30 36 42
Heat output (G 42) - natural gas kW 8 12-17 18-26 27-34 35-41 42-49
(G 42) - propane kW 7 14 21 26 33 40
Weight kg 75 100 122 146 172 193
Water space volume l 7 9,2 11,4 13,6 15,8 18
Diameter of smoke socket mm 80 110 130 160 170 180
Boiler dimensions - width mm 485 485 485 570 740 740
- depth x height mm 733 x 934 773 x 934
Water working overpressure kPa
(bar) 400 (4)
Water test overpressure kPa
(bar) 800 (8)
Heating water maximum temperature °C 85
Heating water minimum temperature °C 45
Return water minimum temperature °C 45 (25*)
Noise level dB max. 65 dB (A)
Chimney draught mbar min. 0,025
Boiler connections - heating water Js 1“
- return water Js 1“
- gas Js 1/2"
Connecting voltage 1/N/PE 230 V AC 50 Hz TN-S
Electric input kW 0,1
Electric coverage IP 40
* When adhering to the lowest heating water temperature

7
Tab. no. 3a) Thermal - technical parameters of G 42 boiler equipped with SINGLE STAGE or
DOUBLE STAGE GAS VALVE and designated for NATURAL GAS combustion
(thermal power 34,16 MJ.m
-3
, gas temperature 15 °C and bar. air pressure 1013,25 mbar)
Number of sections
pc
2
3
4
5
6
7
Rated heat output maximum kW 8 17 26 34 41 49
Rated heat output minimum kW - 12 18 27 35 42
Rated heat input maximum kW 8,84 18,78 28,02 37,20 44,85 53,18
Rated heat input minimum kW - 13,18 19,66 29,8 38,34 45,90
Gas volume flow rate at maximum heat output m
3
.h-1 0,932 1,980 2,953 3,920 4,727 5,605
Gas volume flow rate at minimum heat output m
3
.hod
–
1
- 1,390 2,072 3,141 4,041 4,837
Gas volume flow rate at maximum heat output dm
3
.min
-
1
15,53 33,0 49,22 65,33 78,78 93,42
Gas volume flow rate at minimum heat output dm
3
.min
-
1
- 23,17 34,53 52,35 67,35 80,62
Efficiency at maximum heat output % 90,5 – 93
Efficiency at minimum heat output % 90,5 – 91,5
No
x
category 2
Combustion products temperature in smoke
flue at maximum heat output °C 90 – 120
Combustion products temperature in smoke
flue at minimum heat output °C 80 – 90
Real volume of dry combustion products at
maximum heat output m
3
.m
-3
17,80 23,33 19,23 23,89 20,66 18,25
Real volume of dry combustion products at
minimum heat output m
3
.m
-3
- 25,09 27,52 28,67 23,65 25,09
Connecting gas overpressure mbar 20
Gas overpressure on burner nozzles at
maximum heat output mbar
13,7 13,2 15,8 14,2 14,7 14,3
Gas overpressure on burner nozzles at
minimum heat output mbar
- 6,8 7,8 8,9 10,8 10,6
Number of cool. sticks on a tube pc 2 3 3 3 3 3
Number of nozzles pc 1 2 3 4 5 6
Nozzles diameter mm 2,4 2,52 2,52 2,52 2,45 2,45
Connecting gas overpressure mbar 13
Gas overpressure on burner nozzles at
maximum heat output mbar
10 10 11 11 11,7 11,5
Gas overpressure on burner nozzles at
minimum heat output mbar
4,6 4,7 4,8 6,8 8,8 8,6
Number of cool. sticks on a tube pc 2 3 3 3 3 3
Number of nozzles pc 1 2 3 4 5 6
Nozzles diameter mm 2,7 2,7 2,7 2,7 2,7 2,7
Note: At a single stage valve the heat output is pre-set by the manufacturer to the maximum.
Tab. no. 3b) Thermal - technical parameters of G 42 boiler equipped with SINGLE STAGE GAS
VALVE and designated for PROPANE combustion
(thermal power 87,75 MJ.m
-3
, gas temperature 15 °C a bar. air pressure 1013,25 mbar)
Number of sections
pc
2
3
4
5
6
7
Rated heat output kW 7 14 21 26 33 40
Rated heat input kW 7,73 15,21 22,82 28,32 35,90 43,79
Fuel volume rated flow m
3
.h-1 0,317 0,624 0,936 1,162 1,473 1,796
Fuel volume rated flow dm
3
.min
-
1
5,28 10,40 15,60 19,37 24,55 29,93
Boiler efficiency % 90,5 – 92
No
x
category 2
Combustion products temperature in smoke
flue °C 90 – 110
Real volume of dry combustion products m
3
.m
-
3
46,42 59,5 95,87 67,3 58,55 56,15
Connecting fuel overpressure mbar 30
Gas overpressure on burner nozzles mbar 27,5 28,5 28 27 27,5 27,5
Number of cool. sticks on a tube pc 2 3 2 3 3 3
Number of nozzles pc 1 2 3 4 5 6
Nozzles diameter mm 1,55 1,55 1,5 1,5 1,5 1,5

8
Tab. no. 4a) Thermal - technical parameters of G 42 ECO boiler with burner OVO Třinec equipped
with SINGLE STAGE or DOUBLE STAGE GAS VALVE and designated for NATURAL
GAS COMBUSTION
(thermal power 34,16 MJ.m
-3
, gas temperature 15 °C a bar. air pressure1013,25 mbar)
Number of sections
pc
2
3
4
5
6
7
Rated heat output maximum kW 8 17 26 34 41 49
Rated heat output minimum kW - 12 18 27 35 42
Rated heat input maximum kW 8,87 18,52 28,32 36,99 44,56 54,44
Rated heat input minimum kW - 12,95 19,25 29,18 38,34 45,75
Gas volume flow rate at maximum heat
output m
3
.h-1 0,935 1,952 2,985 3,899 4,696 5,737
Gas volume flow rate at minimum heat
output m
3
.h
-1
- 1,365 2,029 3,075 4,041 4,822
Gas volume flow rate at maximum heat
output dm
3
.min
-1
15,58 32,53 49,75 64,98 78,27 95,62
Gas volume flow rate at minimum heat
output dm
3
.min
-1
- 22,75 33,82 51,25 67,35 80,37
Boiler efficiency at maximum heat output % 90 – 92
Boiler efficiency at minimum heat output % 90 – 93,5
No
x
category 5
Combustion products temperature in smoke
flue at maximum heat output °C 105 – 125
Combustion products temperature in smoke
flue at minimum heat output °C 80 – 100
Real volume of dry combustion products at
maximum heat output m
3
.m
-3
17,38 23,33 19,71 23,89 20,04 19,86
Real volume of dry combustion products at
minimum heat output m
3
.m
-3
- 25,09 27,10 28,67 23,27 25,09
Connecting gas overpressure gas mbar 20
Gas overpressure on burner nozzles at
maximum heat output mbar
13,2 14,9 14,8 14,7 14,9 15,2
Gas overpressure on burner nozzles at
minimum heat output mbar
- 8 7,6 9,8 11,4 10,9
Number of nozzles pc 1 2 4 5 6 7
Nozzles diameter mm 2,45 2,45 2,20 2,20 2,20 2,25
Connecting gas overpressure mbar 13
Gas overpressure on burner nozzles at
maximum heat output mbar
10 10 11 11 11,7 11,5
Gas overpressure on burner nozzles at
minimum heat output mbar
4,6 4,7 4,8 6,8 8,8 8,6
Number of cool. sticks on a tube pc 2 3 3 3 3 3
Number of nozzles pc 1 2 3 4 5 6
Nozzles diameter mm 2,7 2,7 2,7 2,7 2,7 2,7
Note: At a single stage valve the heat output is pre-set by the manufacturer to the maximum.
Tab. no. 4b) Thermal - technical parameters of G 42 ECO boiler with burner OVO Třinec equipped
with SINGLE STAGE GAS VALVE and designated for PROPANE combustion
(thermal power 87,75 MJ. m
-3
, gas temperature 15°C a bar. air pressure 1013,25 mbar)
Number of sections
pc
2
3
4
5
6
7
Rated heat output kW 7 14 22,5 30 36 42
Rated heat input kW 7,71 15,22 24,43 32,61 39,13 45,78
Fuel volume rated flow m
3
.h-1 0,316 0,624 1,002 1,338 1,605 1,878
Fuel volume rated flow dm
3
.min
-
1
5,27 10,40 16,70 22,30 26,75 31,30
Boiler efficiency % 90,7 - 92
No
x
category category 5
Combustion products temperature in smoke
flue °C 105 – 125
Real volume of dry combustion products m
3
.m
-
3
44,55 59,5 81,67 67,6 58,55 50,05
Connecting fuel overpressure mbar 30
Gas overpressure on burner nozzles mbar 27,8 27,84 27,8 28,24 27,74 27,5
Number of nozzles pc 1 2 4 5 6 7
Nozzles diameter mm 1,55 1,54 1,42 1,42 1,42 1,42

9
Tab. no. 5) Thermal - technical parameters of G 42 ECO boiler with burner Furigas equipped with
SINGLE STAGE or DOUBLE STAGE GAS VALVE and designated for NATURAL GAS
COMBUSTION
(thermal power 34,26 MJ. m
-3
, gas temperature 15°C a bar. air pressure 1013,25 mbar)
Number of sections
pc
4
5
6
7
Rated heat output maximum kW 26 34 41 49
Rated heat output minimum kW 18 27 35 42
Rated heat input maximum kW 28,04 37,28 44,71 53,73
Rated heat input minimum kW 19,37 29,68 38,38 46,34
Gas volume flow rate at maximum heat
output m
3
.h-1 2,946 3,917 4,698 5,646
Gas volume flow rate at minimum heat
output m
3
.hod
-1
2,035 3,119 4,033 4,869
Gas volume flow rate at maximum heat
output dm
3
.min
-1
49,10 65,28 78,30 94,10
Gas volume flow rate at minimum heat
output dm
3
.min
-1
33,92 51,98 67,22 81,15
Boiler efficiency at maximum heat output % 91 – 93
Boiler efficiency at minimum heat output % 90,5 – 93
No
x
category category 5
Combustion products temperature in smoke
flue at maximum heat output °C 104 – 125
Combustion products temperature in smoke
flue at minimum heat output °C 80 – 100
Real volume of dry combustion products at
maximum heat output m
3
.m
-3
26,97 23,89 21,15 19,43
Real volume of dry combustion products at
minimum heat output m
3
.m
-3
42,03 29,3 23,96 25,2
Connecting gas overpressure mbar 20
Gas overpressure on burner nozzles at
maximum heat output mbar
15,5 14,8 14,7 13,3
Gas overpressure on burner nozzles at
minimum heat output mbar
7,8 0,95 11,3 0,99
Number of nozzles 3 4 5 6
Nozzles diameter mm 2,45 2,45 2,45 2,5
Note: At a single stage valve the heat output is pre-set by the manufacturer to the maximum.
4. Boiler construction
The cast-iron sectional boiler drum made of grey cast iron according to ČSN 42 2420 - „Cast iron 42 2420
with laminated graphite“ is the main part of the boiler.
The boiler construction corresponds to the strength requirements according to
ČSN 07 0240 Warm-water and law-pressure steam boilers
EN 297 Gas – fired central heating boilers – Type B
11
and B
11BS
fitted with atmospheric burners of
nominal heat input not exeeding 70 kW
The boiler output is determined by number of sections. Individual sections are connected by means of forced
on insertions φ47 mm (length 36 mm, angle 1°45") and are tightened by anchor bolts thus creating the
combustion space, convection surface and boiler water volume inside the sections. The convection surface
construction allows cleaning the boiler drum mechanically by using the enclosed brush. The heating water
inlet and outlet in the rear part of boiler is equipped with pipes 1”. At the return water connection there is
installed the discharge valve. At the heating water outlet there must be installed an automatic bleeder valve
which is included in the serial delivery. The whole boiler drum is insulated by using a harmless mineral
insulation, which reduces the losses caused by heat transfer to the ambient.
To the upper part of boiler drum there is fastened by means of screws an inbuilt draught diverter with the
neck for putting on a smoke pipe. The draught diverter is equipped with a dismountable cleaning cover.
The boiler drum is positioned on a steel base closing the burner space from below. The anticorrosive steel
cover plate and thermal insulation belong to the boiler drum.
The boiler steel shell surface is coated with a good quality comaxit paint.
For version G 42 ECO the atmospheric burner consists of low-emission burner tubes in oval new type
design made of anticorrosion steel with a long service life. Individual tubes are fastened on the burner plate
by four screws. At two and three sectional boiler versions there are used the burner tubes of VI OVO 1G

10
type and at other (multi-sectional) versions the burner tubes of VI OVO 1E type. The tubes differ from each
other only in perforation width. The emission standards, directions and regulations serve as a criterion for
heat ecological and economical heat generation examination. The burner tubes represent an advanced
special burner system which:
- Significantly spares the environment
- The emission values are significantly lower than those set by very strict values of MŽPČR 05/97
Direction for "Environmentally friendly products with demands on trademark impartation " and also
the "Blue angel "limit requirements.
- The burner is certified not only for natural gas, but also for liquid gas - propane.
A progressive burner construction enables to close fully the boiler combustion space; al air necessary for
combustion is brought into the burner tubes through the diffusers. The gas distributor incl. the gas nozzles is
welded to the burner plate.
Pressure loss & flow diagram (pz-Q diagram)
VIADRUS G42 boiler
0
1000
2000
3000
4000
5000
6000
7000
8000
0 0,1 0,2 0,3 0,4 0,5 0,6
Q [dm
3
/s]
p
z
[Pa]
2 články
3 články
4 články
5 článků
6 článků
7 článků
Fig. no. 2 Hydraulic resistance
We offer the stationary low-temperature boiler together with safety and control automatics in natural gas and
propane design with ignition pilot burner.
Then this boiler variant can be equipped with low-emission Furigas burner. This is equipped with low-
emission oval type tubes.
Furigas burner is designated for natural gas combustion in single stage and double stage design at
4 - 7 sectional boilers.
For G 42 version–the atmospheric burner consisting of circular 5T tubes with cooling sticks is the basic
design.
For G 42 ECO version – the atmospheric burner consisting of OVO tubes is the basic design.
2 boiler elements
3 boiler elements
4 boiler elements
5 boiler elements
6 boiler elements
7 boiler elements

11
1. The rear part of boiler
shell
2. Electrical panel
3. RVA Regulator
4. Network module
5. Blind flange with opening
6. Electric panel cover
7. Blind flange
8. Operating thermostat
9. Mounting plate
10. Safety thermostat
11. Base
12. Side shell left
13. Side shell right
14. The upper part of boiler
shell
15. The frontal part of boiler
shell
16. The rear part of boiler
shell
17. Shade
18. Burner plate
19. Burner tube OVO
20. Ignition pilot burner
Furigas
21. Ignition pilot burner
Polidoro
22. Honeywell valve
23. Gas supply pipe
24. Honeywell automatics
25. SIT automatics
26. Gas valve SIT
27. End section left
28. End section right
29. Central section
30. Boiler insertion 47
diameter
31. Anchor screw
32. Distribution pipe
33. Inlet tube
34. Outlet pipe
35. Thermostat reservoir
36. Return valve to the
thermomanometer
37. Earth screw
38. Upper inbuilt draught
diverter insulation
39. Inbuilt draught diverter
face insulation
40. Inbuilt draught diverter
41. Combustion space
cover.plate
42. Shade
43. Electric panel bracket
44. Burner plate –circular tub.
45. Burner tube - circular
46. Reduced extension
47. Bleeder valve
48. Discharge cock
49. Burner plate Furigas
50. Burner tube Furigas
51. Secondary air shade
52. Boiler drum insulation
53. Boiler thermostat
54. Terminal board
55. Combustion products
thermostat
56. Suppression component
57. Plug 1/2”
58. Plug 1“
59. Peephole sheet
60. Peephole sealing
61. Glass cap (of peephole)
Fig. no. 3 Boiler assembly VIADRUS GARDE G 42 a G 42 ECO

12
The boiler designated for natural gas combustion
Is equipped (optionally) with one of three offered gas valves:
1. DOUBLE STAGE COMBINED ELECTROMAGNETIC VALVE HONEYWELL
VK 4100 Q 2003B OR VK 4100 P 2004 EQUIPPED WITH A HIGH-LOW COIL (fig.no. 25a)
–Enables an automatic boiler operation in double stage working regime (rated output – reduced output)
–Automatic switching over between both output stages is ensured by Rego type 95001 outdoor
thermostat
–The boilers equipped with this gas valve can be equipped with programmable Honeywell CM 707
regulator or with regulation A1 – A3 – at G 42 ECO boiler
2. DOUBLE STAGE COMBINED ELECTROMAGNETIC VALVE SIT
SIGMA 843 EQUIPPED WITH HIGH-LOW COIL (fig.no. 25b)
–Enables an automatic boiler operation in double stage working regime (rated output – reduced output)
–Automatic switching between both heat output stages is ensured by Rego type 95001 outdoor
thermostat
–The boilers equipped with this gas valve can be equipped with programmable Honeywell CM 707
regulator or with regulation A1 – A3 – at G 42 ECO boiler
3. SINGLE STAGE COMBINED ELECTROMAGNETIC VALVE HONEYWELL
VK 4100 A 1002 (fig.no. 26)
–The boiler can only be operated at the output which can be firmly set according to tab. no.3a, 4a, 5
(adjustment can only be done by a contractual service organization trained by manufacturer)
–It enables the connection of all both offered types of regulation (Honeywell CM 707 programmable
regulator or A1 – A4 regulation)
On the gas valve bodies of VK 4100Q 2003B and VK 4100A 1002 types there is installed the burner
automatics type S 4565 BF 1088 or S 4565 BF 1112 with failure light signalling and unblocking push button.
On the SIT Sigma 843 gas valve there is installed the SIT 537 automatics.
The boiler designated for propane combustion is equipped with:
1. SINGLE STAGE COMBINED ELECTROMAGNETIC VALVE HONEYWELL
VK 4100 A 1002 (fig.no. 26)
−The boiler can only be operated at the output which stated in tab. no. 3b, 4b (the particular output is set
ma manufacturer)
–It enables the connection of all both offered types of regulation (Honeywell CM 707 programmable
regulator or A1 – A4 regulation)
On the Honeywell gas valve body there is installed the S 4565 BF 1112 1 burner automatics.
We offer the burner ignition designs as follows:
a) Polidoro ignition pilot burner
- The burner ignition and watching operations are provided by low-emission ignition pilot burner. If the
main burner ignition is required there automatically after T
w
= 1 s waiting time the inbuilt lighter is
switched on and the ignition pilot burner gas valve opens. The ignition sparkle lights the ignition pilot
burner and its flame will be then sensed by the flame sensor. After the ignition pilot burner flame has
settled the ignition is switched off and the main valve for main burner gas supply will open. If the
ignition pilot burner does not ignite during T
s
= 55 s (T
s
= 25 s), (SIT T
s
= 60 s) safety time then the
blocking automatics will switch on. If the flame goes out during the normal operation the ignition
automatics will repeat the ignition cycle.
b) Furigas ignition pilot burner
- its function and the function of above described Polidoro ignition pilot burner are identical.
The ignition pilot burner is switched off together with the main burner.
Other controlling, safety and signalling elements are installed in boiler control panel which is
equipped with network module with elements as follows:
- the main switch
- exceeded temperature signalling (link to the safety thermostat and combustion products return flow fuse)
- automatics reset
- output switch (only at the boilers equipped with double stage electromagnetic valve)
- fuse 2,5 A
- safety thermostat reset (set to 97 °C)

13
- combustion products return flow fuse reset
- boiler thermostat (delivered as standard with 0 - 85°C range)
The control panel is then equipped with a combined thermometer and manometer. The combustion products
return flow fuse sensor is installed in horizontal draught diverter and it shuts down the boiler in case of an
insufficient combustion products drawing-off.
The boiler and safety thermostat sensors are installed in a reservoir (in upper part of left outer section), the
manometer return valve is crewed in upper part of right outer section.
ionizační
elektroda
šroub
elektrod
zapalovací
elektroda
Fig. no. 4a) Polidoro ignition pilot burner
zapalovací
elektroda
hlídací
elektroda
Fig. no. 4b) Furigas ignition pilot burner
izolace
hořákové
desky
zapalovací
hořáček
hořáková
trubice
hořáková
deska
přívod
plynu
difuzor
hořákové
trubice
tryska
hlavního
hořáku
plynový
rozdělovač
Fig. no. 5 Polidoro ignition pilot burner positioning above the burner (dimensions in mm)
ionising electrode
electrodes screw
ignition electrode
NOZZLES TABLE
Nozzles diameter (mm)
NOZZLE
NATURAL GAS 0,45
NOZZLE
PROPAN 0,24
watching electrode
ignition electrode
NOZZLES TABLE
Nozzles diameter (mm)
NOZZLE
NATURAL GAS 0,4
burner plate
insulation
ignition pilot
turner
burner tube
burner plate
gas supply
burner tube diffuser
gas distributor
main burner nozzle

14
5. Regulation
5.1 Control, safety and regulation elements
As a standard the is delivered without the superior regulation and equipped with control panel with network
module.
The manufacturer does not recommend to operate boiler without regulation. The standard version (without
regulation) is determined for customers who have their own system of boilers control.
Besides the network module in the control panel there is mounted the combined device - the
thermomanometer.
The network module is equipped with following elements (according to individual boiler variants):
- the main switch with signalling
- exceeded temperature signalling (safety thermostat and combustion products return flow fuse)
- automatics failure unblocking
- reduced/rated boiler output switch
- safety thermostat unblocking (at the open systems keep the setting by manufacturer it means to 97 °C)
at the closed systems with pressure expansion reservoir can be set up to 105 °C)
- combustion products return flow fuse unblocking (set to 75 °C)
- boiler thermostat (0 – 85 °C range, recommended to be set to 85 ºC)
- network fuse 2,5 A
The combustion products return flow fuse sensor is installed in horizontal draught diverter and in case of an
insufficient combustion products drawing-off it closes down the boiler. The sensors of boiler and safety
thermostats (possibly also the of pump thermostat) and of the thermometer are installed in the reservoir of
left outer section and the manometer clack valve is installed in upper part of the right outer section.
5.1.1 Equitherm regulation
Optionally together with boiler there is delivered one of four kinds of regulation, or their combination
according to the purchase order key stated in chapter no. 1.1. The regulators are delivered in a
separate packing and in the place of boiler installation there is mounted the control panel according
to the requirements. The vacant places in panel are in standard delivery equipped with blind flanges.
The most important characteristics of Siemens regulators:
equitherm regulation
a quick inhibition and a quick change in heating medium temperature (quick inhibition and a quick
heating)
summer/ winter automatic switching-over
boiler relief when starting
boiler protection against overheating (pump operation drifting)
pre-setting of minimum and maximum value of boiler heating water temperature (boiler outlet heating
water temperature)
anti-freeze protection of buildings and facilities
pumps protection by means of a regular start
heating schedule (every day during a week can be programmed separately)
possibility of mutual co-operation of up to 16 regulators in RVA series…
when connecting the indoor device QAA50 or QAA70 it is possible to control the boiler remotely and
there is guaranteed the adaptation of heating curves in dependence on buildings construction and heat
consumption.
On top of it RVA 33.121, RVA 43.222 and RVA 63.280 regulators have:
the function of a “ chimney sweeper” – the boiler is automatically set into operation for required
combustion products measurement- the boiler is operated in full swing regardless the preset automatic
regime.
Registration of operation hours and number of burner starts

15
A1 - EQUIHERM REGULATOR RVA 43. 222
Is the regulator for boiler and heating circuit for: double stage burner, with the possibility to produce
HWS, with pump heating circuit (without a mixing valve).
Other regulator characteristics:
• heating circuit regulation with circulation pump
(without a mixing valve) or a cascade
connection (up to 4 boilers)*
A2 - EQUITHERM REGULATOR RVA 46. 531 + RVA 43.222
Is a set of boiler and heating circuit regulators for: double stage burner, with the possibility to produce
HWS incl. the mixing valve in heating circuit.
Other regulator characteristics:
• Suitable first of all for a cascade connection
(up to 16 boilers) *
A3 - EQUITHERM REGULATOR RVA 63.280
Is a boiler and heating circuit regulator for: double stage burner, with the possibility to produce HWS
with two sensors, incl. two mixing valves.
Other regulator characteristics:
• The heating circuits can be preset as
independent (two independent heating circuits)
or as dependent (floor heating combined with
radiators)
• The independent schedule for hot service water
preparation
A4 - EQUITHERM REGULATOR RVA 33. 121
Is a boiler and heating circuit regulator for: single stage burner, with the possibility to produce HWS
s with pump heating circuit (without a mixing valve).
Other regulator characteristics:
• The independent schedule for hot service water
preparation
• No other RVA regulators can be connected
* Note:
In case of a cascade connection every boiler must be equipped with RVA 43.222 regulator and at
least one boiler also with RVA 46.531 regulator (number of RVA 46.531 regulators must correspond
to the number of operated heating circuits).
The regulator is enclosed according to the purchase order including a separate operation manual.
As a standard the regulators are delivered incl. QAZ 21 immersion thermometer sensor for heating
water.

16
5.2 Electric wiring diagrams
Fig. no. 6a) VIADRUS GARDE G 42 a VIADRUS GARDE G 42 ECO boiler wiring diagram for version
NG 2° SIT automatics
Legend: F1 Fuse 2,5A S1 main switch H1 “boiler under voltage” signalling Z1 suppression component TC241 BT2 combustion products thermostat H2 “failure” signalling BT1 safety thermostat BT4 boiler thermostat BT6 outdoor thermostat S2 reduced/rated output switch Y3 2* valve coil M9 combustion products ventilator
E1 ignition electrode E2 ionising electrode Y1 SIGMA 843 gas valve A1 SIT 537.201 ABC automatics S3 Reset button H3 “ionising failure” signalling Y2 three-way valve BT7 TUV heater thermostat BT5 indoor thermostat BT8 circulation pump thermostat Q1 circulation pump

17
Fig. no. 6b)/1 VIADRUS GARDE G 42 and VIADRUS GARDE G 42 ECO boiler wiring diagram for
version for version NG 2° with SIT automatics
Conductor colour: GNYE= green-yellow RD= red BK= black BN= brawn BU= blue
Z1
suppression component
X1, X11
boiler terminal boards,
M9
combustion
products
ventilator
Y3
2* valve coil
BT6
outdoor
thermostat
Y2
three-way
valve
Q1
circulation
pump
BT8
circulation
pump
thermostat
BT7
HWS
heater
thermostat
BT5
indoor
thermostat
distribution box
drum
Boiler
drum

18
Fig. no. 6b)/2 VIADRUS GARDE G 42 and VIDRUS G 42 ECO boiler wiring diagram for version for
version NG 2° with SIT automatics
Legend: Z1 suppression component, X1, X11 boiler terminal boards, A1 ionising automatics SIT 537.201 ABC, Y1 gas valve SIGMA 843, E1 ignition electrode, E2 ionising electrode, BT2 combustion products thermostat, BT1 safety thermostat,
BT4 operating thermostat, S1 main switch, H1 “boiler under voltage” signalling, H2 failure signalling, H3 ionising failure signalling, S3 reset button, S2 reduced/rated output switch, F1 2,5 A fuse
network module
Burner

19
Fig. no. 7a) VIADRUS GARDE G 42 a VIADRUS GARDE G 42 ECO boiler wiring diagram for
version NG 2° Honeywell automatics
Legend: F1 Fuse 2,5A S1 main switch H1 “boiler under voltage” signalling Z1 suppression component TC241 BT2 combustion products thermostat H2 “failure” signalling BT1 safety thermostat BT4 boiler thermostat BT6 outdoor thermostat S2 reduced/rated output switch Y3 2* valve coil
M9 combustion products ventilator E1 ignition electrode E2 ionising electrode Y1 VK4100 Q 2003 B Honeywell gas valve A1 S 4565 BF 1112 1 Honeywell automatics S3 Reset button H3 “ionising failure” signalling Y2 three-way valve BT7 HWS heater thermostat BT5 indoor thermostat BT8 circulation pump thermostat Q1 circulation pump

20
Fig. no. 7b)/1 VIADRUS GARDE G 42 and VIADRUS GARDE G 42 ECO wiring diagram for version
NG 2° with Honeywell automatics
Z1
suppression component
X1, X11
boiler terminal boards,
M9
combustion
products
ventilator
Y3
2* valve coil
BT6
outdoor
thermostat
Y2
three-way
valve
Q1
circulation
pump
BT8
circulation
pump
thermostat
BT7
HWS
heater
thermostat
BT5
indoor
thermostat
distribution box
drum
Conductor colour: GNYE= green-yellow RD= red BK= black BN= brawn BU= blue
Boiler
drum