Rima ONGAS 300 W Series User manual

ONGAS 300/W WALL TYPE CONDENSING BOILER
ONGAS 300 FLOOR TYPE CONDENSING BOILER
C * ONGAS 303 W * ONGAS 303
* ONGAS 304 W * ONGAS 304
* ONGAS 304 W Plus * ONGAS 305
* ONGAS 305 W * ONGAS 306
* ONGAS 306 W * ONGAS 307
* ONGAS 307 W
USER’S MANUAL

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TABLE OF CONTENTS
1. General Information
1.1. Introduction .................................................................................................................................. 5
1.2. Certificates.................................................................................................................................... 6
1.3.1. Explanations of the Symbols..................................................................................................... 6
1.3.2. General Warnings and Recommendations................................................................................. 8
1.3.2.1. Points to be Considered During Handling and Transport....................................................... 8
1.3.3. Power Saving............................................................................................................................. 8
1.3.4. Cascade Configuration .............................................................................................................. 9
1.3.5. Safety Instructions……………………………………………………………………………..9
1.4. Responsibilities............................................................................................................................. 9
1.4.1 Things To Do Before Calling an Authorized Service ................................................................ 10
1.5. Explanation of the Symbols on the Packaging............................................................................. 12
1.5.1. Parts Delivered With the Product.............................................................................................. 13
1.6. Data and Packaging Labels........................................................................................................... 13
1.6.1 Gas Type Labels......................................................................................................................... 14
2. General Specifications of the Condensing Boiler.................................................................................. 14
2.1. Components of the Wall Type Condensing Boiler....................................................................... 15
2.2. Components of the Floor Type Condensing Boiler...................................................................... 15
2.3. Technical Specifications of the Wall Type Condensing Boiler.................................................... 16
2.4. Technical Specifications of the Floor Type Condensing Boiler................................................... 17
3. Installation and Commissioning............................................................................................................ 18
3.1. Minimum Distances Recommended............................................................................................ 18
3.2. Dimensions of the Wall Type Condensing Boiler....................................................................... 19
3.3. Dimensions of the Floor Type Condensing Boiler...................................................................... 19
3.4. Instructions for Installation.......................................................................................................... 19
3.5. Gas Connections.......................................................................................................................... 20
3.6. Power Connections...................................................................................................................... 21
3.7. Electrical Wiring Diagram........................................................................................................... 22
3.8. Commissioning............................................................................................................................ 24

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4.Operation of the Control Panel .............................................................................................................. 25
4.1. Control Panel Screen................................................................................................................... 25
4.2. Application Modes ...................................................................................................................... 25
4.3. Programming............................................................................................................................... 29
4.4. User Levels.................................................................................................................................. 31
4.5. Operation of Control Panel Accessories...................................................................................... 34
5. Installation and Inspection of the Piping............................................................................................... 35
5.1. Heating (Radiator) Water ............................................................................................................ 35
5.1.1. Water Conditioning .................................................................................................................. 36
5.1.2. Water Pressure.......................................................................................................................... 36
5.2. Discharging of the Condensate.................................................................................................... 37
5.3. Instructions for the Adjustment of Gas Ratio.............................................................................. 38
5.4. Flue Connections......................................................................................................................... 41
5.4.1. Examples of Installation........................................................................................................... 41
5.4.2. Flue Installation for ONGAS 300 Series.................................................................................. 42
5.5. Hydraulic Piping Connection Diagram Examples for ONGAS 300 Series................................. 43
6.Error Codes List ..................................................................................................................................... 45
7.Cleaning and Maintenance ..................................................................................................................... 52
7.1. Inspection of the Burning System ............................................................................................... 53
7.2. Cleaning of the Modulated Fan, Venturi, Burner........................................................................ 54
7.3. Inspection of the Electrode.......................................................................................................... 54
8.Warranty Conditions and Commissioning ............................................................................................ 55
8.1. Condensing Boiler Commissioning Form.................................................................................. 56
8.2. Operating Instructions ................................................................................................................ 57
8.3. Inspection of the Condensing Boiler System.............................................................................. 59

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1.GENERAL INFORMATION
1.1.Introduction
First of all, we would like to thank you for choosing the RIMA brand.
In this manual, you will find installation and operation information for the RIMA branded wall and floor type
natural gas condensing heating boilers with aluminum cast fins manufactured by ÖNMETAL.
Please read this booklet carefully in order to operate your device with high efficiency and economically,
comfortably and for a long period.
DO NOT tamper with any component or setting of your device for any reason other than as described in this
manual, such as operating, adjusting, or maintaining the device.
Have your device installed by Authorized Dealers.
Our Authorized Dealers and After-sales Service Centers shall provide you with the necessary information
about the operation and maintenance of your device after placing the device, making the required connections
and commissioning it.
In case you cannot contact with our Authorized Services and for any problems you have, our Central
Technical Service shall help you.
We wish you to use your boiler in good times.
1.2.Certificates
Önmetal Döküm Sanayi ve Tic. Ltd. Şti. is certified with the Certificate of Competency with After-sales
Services as per TS 12676 Authorized Services - The Rules for the Boilers and Heat Exchangers as the scope of
the service dated and numbered 14.09.2011/0 and issued by the T.R. MINISTRY OF CUSTOMS AND
TRADE’s Directorate General of Consumer Protection And Market Surveillance, and with the Service Place
Competency Certificate issued by TSE.
The structure and operation of the boilers comply with the Regulations of European Union and the conditions
stipulated in the regulations of all countries in which the European Union Standard is applicable.
ONGAS 300/W and ONGAS 300 Series Wall and Floor Type Condensing Boilers are the registered brands of
Önmetal Döküm Sanayi ve Tic. Ltd. Şti. and they are manufactured in the own facilities of the company in
Edirne, Turkey.
2016/426/EU –Gas Appliances Regulation
2014/35/EU –Low Voltage Directive
2014/30/EU –Electromagnetic Compatibility Directive
92/42/EEC –Efficiency Directive
813/2013/EU –Ecodesign Regulation
2009/125/EC –Ecodesign Requirements Directive (implementing directive)
RIMA ONGAS 300/W Wall Type ONGAS 300 and Floor Type Condensing Boilers comply with the EC
Directives.

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1.3.1.Explanations of the Symbols
Warning Signs
Safety Warnings are indicated with a warning triangle.
Important information for the safety of persons are indicated with the symbol on the left
1.3.2.General Warnings and Recommendations
• ONGAS 300/W and ONGAS 300 Series Wall and Floor Type Condensing Boilers with Aluminum
Cast Fins are designed to be used in heating installations with domestic hot water and/or in domestic
hot water installations and manufactured with the technology and materials suitable for this design.
They shall not be used for this intended use.
• While placing the boiler in the boiler room, the point where the boiler shall be installed and operated shall
have a concrete base that is stable and strong enough to bear the weight of the boiler.
• Example installation diagrams are provided at the end of the manual. Installations for the boilers shall be
made according to these diagrams. Only the general installation principle of the system and the sensors and
relay points used for automation are provided in these diagrams. Installation elements such as sediment traps,
check valves, expansion tanks are not indicated. These equipment shall be selected and installed separately.
• Sufficient space shall be left around the boiler while placing it in the boiler room for maintenance and service
operations.
• In the installation, a sediment trap shall be placed in the secondary circuit after the balance vessel and an air
separator shall be placed in the primary circuit after the balance tank.
• Commissioning and adjustment of the boiler shall be performed Authorized Service Centers of RIMA. See
p.58
• In the summer months when the boiler is not operated, the circulation pumps shall be operated for five
minutes 1-2 times a month to prevent jamming and to extend their service life. (Lime water causes
malfunctions if the boiler is not used for a long period).
• Capacity selection of the boiler shall be performed according to the installation projects prepared in
accordance with the standards. Otherwise it may not be possible to obtain the desired efficiency from the
boiler.
• ONGAS 300/W and ONGAS 300 Series Wall and Floor Type Condensing Boilers are intended for heating
systems only as standard. Another boiler or a heat exchanger is also required to heat the domestic water. To
provide efficient hot water, the capacities of the boiler and the external boiler or heat exchanger shall be
compatible.
• If the boiler has stopped automatically due to over-temperature, do not add cold water to the boiler to restart
the boiler. Wait until the boiler has cooled down and then try restarting, if it does not, inform the authorized
service.
• Electrical supply of the boiler is provided from the mains. For this reason, power and lighting installation of
the boiler room, electrical connections of the boiler, control panels and boiler room grounding line shall be
made by experts of their field in accordance with the relevant standards
• It is suitable for Vented and Hermetic (B and C type) applications, designed for central heating and
optionally for the circulation of domestic hot water.

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• All electrical and electronic controls are supported on the control panel located at the top of the boiler.
• The cleaning of the installation is of utmost importance for the transformation projects from boilers
with solid fuel or liquid fuel to boilers with gas fuel. The installation shall be washed, any leaks shall be
detected and repaired and a plate type heat exchanger shall be used.
• Boilers shall be installed in a place with no risk of frost. When the boiler is not operated, the water remaining
in the radiators shall be drained to prevent freezing.
• Boilers shall not be installed in a location that contains moisture, vapor or dust. Otherwise the boiler shall not
operate correctly and efficiently.
• The floor of the installation location of the boiler shall be stable, firm and wide, and it shall be positioned
high above the ground in order not to be affected by floods.
• The supply of fresh air shall be free of halogen hydrocarbons (sprays, paints and some chemicals), otherwise
these shall cause corrosion and erosion of the boiler and flue.
• Flammable materials shall not be placed on or near the boiler.
• Fresh air intake shall comply with the instructions of the local gas supplier and the instructions for gas
connection, otherwise there is a risk of poisoning.
• Condensate and flue connections shall be made in accordance with the rules and standards.
• Before starting to work on the boiler, always disconnect the main power line and turn off the main gas valve.
• If you smell gas, turn off the main gas valve and call the emergency number for gas leaks in your
neighbourhood. If you smell flue gas, turn off the boiler and call the authorized service immediately
Combustibility (flammability) levels of construction materials and products
A- Non-combustible
Granite, sandstone, concrete, brick, ceramic, fireproof plasters
B- Very Difficult to Burn
acumin, isumin, heraclith, lignose, fiberglass components
C1- Difficult to Burn
Products made of beech or oak, hobrex plates, werzalit, umuakart
C2- Medium Combustibility
Wet wood, black pine, cork and tree crumbs, rubber sole
C3- Easy to Burn
Asphalt Components, Fiber components, cellulose materials, polyurethane, polystyrene, PVC, polyethylene
Keep the boilers at least 200 mm away from flammable materials with B, C1, C2 burning classes as specified
in the table during their installation and operation.
• For materials that burn rapidly and by themselves after any spark, that are easily ignitable with a burning
class of C3, increase the safety distance to at least 400 mm.
The boiler is set for natural gas H/E (G20, 20 mbar) in the factory.
• The boiler shall only be installed in a room that meets proper ventilation requirements and that is separated
from living areas. Otherwise there is a risk of suffocation or poisoning.
• To prevent incorrect circulation, control valves shall be used in conjunction with the circulation pump
system. A strainer (filter) shall be used in the return water lines of the new/old buildings and new/old
installation systems.
• A relief valve (max. 6 bar) and a manometer shall be used in the installation system. No other valves shall be
present between the boiler and the relief valve, otherwise pipes or other parts may explode in the over-
pressurized boiler (risk of evaporation).

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• Supply of cold water to the boiler shall be performed when the boiler is cold.
• It is possible that oxygen may pass through the floor heating pipes into the water. Oxygen in the water causes
corrosion of the boiler. Therefore, if the boiler is to be used in a floor heating system, a heat exchanger shall be
added to the circuit and mixing of the boiler water and installation water shall be prevented.
• The external air sensor is delivered with the device as standard to ensure more economical operation of the
boilers. This sensor allows fuel savings about 35%. Moreover, optional controller units may be installed to
allow scheduling of the boiler. Similar applications are also implemented in cascade systems.
The boiler shall only be installed in a room that meets proper ventilation requirements and that is separated
from living areas. Otherwise there is a risk of suffocation or poisoning. Read the technical instructions before
installation and operation.
1.3.2.1.Points to be Considered During Handling and Transport
Products are shipped on pallets as protected by styrofoam and film.
The products are fastened to the pallets with retaining screws.
In addition, the products are protected with a wooden case against external impacts.
Appropriate markings are provided on the case. During storage, it may be stored at proper ambient humidity
and temperature without opening the package.
1.3.3.Power Saving
The proper use of energy resources in our world is a real problem of modern societies. While we are
generating energy for our future, we use natural resources that shall be exhausted in the near future unless we
encourage more rational and efficient use of these resources.
Condensation technology is a big step towards the rational use of energy as it provides energy savings of up to
35% and lower emission values (80% for CO and 90% for NOx) compared to conventional heating systems.
Moreover, the annual CO2emission values of high efficiency condensing boilers are 20% less in average than
the boilers with standard efficiency.
In the countries that have advanced in technology, all of the new boiler installations are selected as condensing
boilers and the governments have started to encourage persons to choose this technology.
The device offers intuitive and advanced diagnostic systems that allows detection of faults by the
user.

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1.3.4.Cascade Configuration
The use of wall and floor type condensing boilers in central systems is increasing every day. Condensing
boilers designed for this purpose provide high capacities with low space requirement. An advantageous and
economical heating is ensured by reaching a capacity of 187 kW in one boiler and a max. capacity of 2,992
kW with a cascade system. It allows easy installation and easy operation with its compact design which
reduces the space requirement. Provides ease of installation in confined spaces thanks to its easily accessible
internal structure. ONGAS 300/W and ONGAS 300 series provide excellent compatibility when they are
installed to replace old systems that have expired their service life. Condensation technology with advanced
control systems reduces your fuel costs by 30%- 40% by providing fuel savings from the first day of
operation. Allows cascade operation even in areas with a very limited installation space thanks to its compact
design and light weight.
1.3.5. Safety Instructions
The boiler is connected to 230V mains.
An incorrect installation or any attempts to repair using
incorrect electrical components may pose a lethal risk.
Keep unauthorized personnel away from the boiler. Do not
leave any objects on or near the boiler.
Do not touch the hot water connections or the flue outlet during
the operation of the boiler - risk of burning.
Installation, repair, commissioning and maintenance
operations shall only be carried out by suitably qualified
personnel. It complies with all relevant international/local standards and certificates.
Before starting to work on the boiler, always disconnect the main power line and turn off the main
gas valve.
If you smell gas, turn off the main gas valve and call the emergency number for gas leaks in your
neighborhood. If you smell flue gas, turn off the boiler and contact the authorized service or the installer.
1.4. Responsibilities
Manufacturer’s Responsibilities: They shall manufacture and ship products in accordance with the relevant
directives
Responsibilities of the Contractor: Contracting company is responsible for the installation. The company shall
read this manual and follow the instructions provided in the manual before calling the authorized service.

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1.4.1.Points to Consider Before Contacting the Authorized Service
First of all, we would like to thank you for choosing and using the “Rima Condensing Boiler”. Below is a list
of things to do before calling the Rima Authorized Service.
Protect your device against factors that may damage the packaging and the device (moisture, water,
impact, construction materials, etc. ) during the transport and subsequent assembly of the device. The
boilers shall be installed on a stable, firm ground. In case of a surface which is not suitable for
supporting of the boilers and the connection equipment, a suspension system with a metal profile shall
be used.
The installation water shall be conditioned by considering whether the system is a new heating system
to be installed or an heating system to be transformed. If the installation to be used for the system is
old or if it shall be transformed, the water in the installation shall be completely drained and water
shall be conditioned (cleaning shall be performed and a preservative shall be used). We recommend
the use of plate heat exchangers in such systems particularly. The presence of blockages in the
heating installation such as dirt, sediment, burrs, iron dust, lime, etc., adversely affect the operation of
the boiler. This may cause inefficient operation, overheating, noisy operation, and damage to the heat
exchanger of the boiler over time. Installation water shall be conditioned and preserved in new
installations.
o7<pH value used in the installation> 8.5
oFor the hardness of the water, the hardness value appropriate to the capacity shall be
determined in accordance with the table given below.
Water containing sediment or of unknown content such as well water and transport water shall not be
used. Use of any chemicals by adding them to the installation without the approval of the
manufacturer shall render the products void of warranty. As Rima Heating Systems, we recommend
use of water treatment products with Sentinel X100, X300 or X400 brands. Use neutral, non-acidic
and non-alkaline cleaners. Any damage to the product or installation that may occur without taking the
approval of the manufacturer in applications performed using the products of different companies is
out of warranty cover. It is the user’s responsibility to ensure that the water to be circulated in the
installation is clean.
Sub-boiler pumps, hydraulic sets, balance vessels, sediment traps, air separators to be used in the
installation shall be selected as suitable to the boiler and heating installation.
A distance of 10 cm between each boiler shall be provided for ease of installation and service for wall
type condensing boilers.
Total
capacity (kW)
Total hardness (French hardness - ° F)
Total volume of the
system (less than 20
l/kW)
Total volume
of the system
(between 20-50
l/kW)
Total volume of the
system (higher than 50
l/kW)
<50
<30
<20
<0.2
>50<200
<20
<15
<0.2
>200<600
<15
<0.2
<0.2
>600
<0.2
<0.2
<0.2

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Selection of the Balance Tank
Pumps to be installed under each boiler in the heating system shall be selected as energy efficient
pumps. The recommended pump models are given below; and when different brands of pumps are
chosen, the flow rates and pump heads and the pump inlet diameters of the chosen pumps shall be the
same with the recommended pumps.
Boiler Models
Grundfos
Wilo
Pump Diameters
Ongas 303/W
Upml 25/105
Yonos Para 25/7
DN 25
Ongas 304/W
Upml 32/105
Yonos Para 32/10
DN 32
Ongas 304 /W plus
Upmxl 32/125
Yonos Para 32/10
DN 32
Ongas 305/W
Upmxl 32/125
Yonos Para 32/10
DN 32
Ongas 306/W
Magna 40/120
Yonos Para 40/12
DN 40
Ongas 307/W
Magna 40/120
Yonos Para 40/12
DN 40
A separate flue outlet shall made for each boiler and each flue shall be connected to the main flue from
the sides. In case of connection to existing flues, make sure that they are clean, otherwise the flues
may prevent the passing of gases during operation.
All electrical installations are the responsibility of the contractor. Connect your device to a 220 - 230
V single phase and grounded power supply. Connections to the boiler shall be performed by the
authorized service. All connections to be made on the electrical panel through the boiler shall be
performed by Rima authorized service centers. If it is desired that the electrical installation is also

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performed by the authorized service, labor costs shall be subject to a charge to be determined by the
service.
A certificate of conformity shall be taken from the gas companies before calling the service.
Ongas 300 W may only be operated with natural gas. Gas pressure in the gas line shall be set to 21
mbar with a regulator and a filter shall be present in the gas line.
Any leaks in the installation shall be repaired. Faults and damages that may occur due to power-water-
gas installations and/or installation equipment, leaks in the installations, installation connections, and
flue connections are out of the warranty cover. Automatic supply shall not be applied.
The systems where our gas fueled condensing boilers shall be installed are closed-circuit systems. In
closed-circuit systems, a closed expansion tank shall be used. An open expansion tank shall not be
used.
The application pressure of the system is between 0.8 bar and 6 bar. Since the closed-circuit operating
pressure allowed by the boiler is maximum 6 bar, a balance vessel shall be used for pressures up to 6
bar, and a plate heat exchanger shall be used instead of the balance vessel for pressures over 6 bar in
cascade systems. A relief valve with adjustable pressure is not allowed. When a plate heat exchanger
is used, expansion tanks with suitable capacity shall be used on both sides of the system
The boiler drainage shall be directed so that flowing of the condensation water is allowed. The
materials used for the installation the condensate drainage shall be made of plastic. Blocking the
condensate drain shall cause the boiler to shut down automatically or leak from the siphon. If you
suspect a frost condition, it shall be useful to pour hot water into the exposed part of the drain. Always
ensure that the drain is open to ensure that the boiler functions properly.
It is essential to use a manometer that indicates the operating pressure in the system.
Procurement of the zone control module and its installation to the boiler control panel is the
responsibility of the user.
The heating system has a protection function for conditions with a risk of frost. To enable this
function, the power to the boiler room shall be switched on
Faults and damages that occur due to the environmental conditions and incorrect storage by the
consumer are not covered by the warranty.
IMPORTANT: If deficiencies in the system are detected by the service personnel during the commissioning,
our service shall not commission the system; and the service fee incurred when the service is called again for
commissioning following the provision of the necessary conditions in the system shall be borne by the user.
Responsibilities of the User: Reading the manuals, maintaining and preserving the product in accordance with
the warranty conditions, and preventing the intervention of persons other than the authorized service.
1.5. Explanation of the Symbols on the Packaging
Fragile Top side Recycle Protect Against Water
All gas devices shall be installed by qualified technicians. Any error in the installation of these devices may
result in criminal actions as required. RIMA ONGAS 300 / W and ONGAS 300 condensing boilers shall not
be installed or modified in any way other than those specified in this manual. Always keep the boiler in its
safety packaging during its transport before installation. Additional protection measures may when required by
the installation site. Please follow the rules and instructions for the authorization of the installation.

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Packaging Label:
1.5.1. Parts Delivered as Standard with the Product
Siphon Assembly
Operating Manual
Warranty Certificate
Important: Operating instructions to ensure that the boiler may be used without any problem for many years
are included in the operating manual.
1.6.Data Label –Wall Type Boilers / Floor Type Boilers

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2. GENERAL SPECIFICATIONS OF THE CONDENSING BOILER
1.6.1.Gas Type Label
The boiler is set for natural gas H/E (G20, 20 mbar) in the factory.
The operating principle of the condensing boiler is similar with the hermetic devices. The most
important difference is the structure of the heat exchanger and the fact that it has a larger surface
area to absorb more heat from the flue gases.
The design and structure of the main heat exchanger is capable of reducing the temperature of flue gases
below 54°C and cooling the flue gases when the temperature of the boiler return water is sufficiently low. The
water vapor in the flue gases of which the temperature is reduced below 54°C is condensed and the latent heat
in the water vapor is recycled to the system. The waste heat would be discharged to the atmosphere with the
flue gases if this recovery is not performed.
While the flue gas temperatures are about 200–250°C in conventional boilers, this value is about 50–60°C in
condensing boilers, and this is where the potential recovery is obtained.
Common features of the burners used in condensing devices:
• Operating with gigh efficiency,
• Wide modulation ranges,
• Ease of setting according to the gas types used,
The fact that they are designed considering ease of service and maintenance.
While the devices may meet the requirement for small capacity with a very low power (such as 18 kW) in
these systems, they may also be operated at full capacity when required. Moreover, applications with multiple
boilers (cascade applications) from the minimum capacity up to 2992 kW are also allowed according to the
product models for larger capacity requirements. By providing modulation between 18 kW and 2992 kW, the
required heat is produced in the most efficient way according to the current heating requirement of the
building, thus both fuel economy and a clean combustion that is free of the operating style called stop-start
operation are provided thanks to continuous combustion.

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2.1.Components of the ONGAS 300/W Wall Type Condensing Boiler
2.2.Components of the ONGAS 300/W Floor Type Condensing Boiler

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2.3. Technical Specifications of the Wall Type Condensing Boiler
ONGAS 300 /W Series
303W
304W
304 WP
305W
306W
307W
Efficiency and Performance
Maximum thermal load at heating mode
kW
65
95
110
119
148
180
Minimumthermal load at heating mode
kW
15
20
20
19
34
38
Maximum thermal power at heating mode (80/60°C)
kW
62
90
109
115
142
171
Minimum thermal power at heating mode (80/60°C)
kW
14
19
19
18
33
37
Maximum thermal power at heating mode (50/30°C)
kW
69
100
115
124
154
187
Minimum thermal power at heating mode (50/30°C)
kW
16
22
22
21
37
41
Efficiency at full load (80/60°C)
%
96.2
94.7
97.5
96.4
96
95.1
Efficiency at minimum load (80/60°C)
%
93.7
94.8
94.8
94.8
96.2
96.4
Efficiency at full load (50/30°C)
%
106.4
105.2
104.5
104.3
103.8
103.7
Efficiency at minimum load (50/30°C)
%
107.1
108.3
108.3
108
109.4
109.5
Efficiency at partial load (30%) (30°C return temperature)
%
105.8
105.3
108.4
105.7
106.2
106.6
NOx class
5
Maximum heating mode setting temperature
°C
80
Maximum domestic water setting temperature
°C
65
Maximum heat exchanger ΔT protection temperature
°C
26
Flue waste gas pressure at full load
pascal
230
230
260
180
210
190
Applied water pressure (min –max)
bar
0.8 - 6
Noise level (at 1 m from the boiler)
dB
35
41
44
48
52
55
Structural specifications
Water volume
liters
6.5
8.5
8.5
10.5
12.5
14.5
Dry weight
kg
65
82
88
103
130
167
Electrical specifications
Supply
V/Hz
230/50
Protection level
IP
IPX4D
Power consumption
W
190
190
190
190
310
315
Water and gas connections
Water inlet-outlet diameters
1”
1 ¼”
1 ½”
Gas inlet
1”
1”
1 ½”
Waste gas outlet (Ø)
80
100
100
110
125
160
Values for burning
Flue application
B23, C63,
C13, C33
B23, C63
Burning efficiency at full load
98.2
98.2
98.3
98.3
98.2
98.1
Burning efficiency at minimum load
98.4
98.4
98.4
98.5
98.4
98.4
Flue gas temperature at full load (80/60°C)
59.3
60.8
62.3
59.9
59.7
61.4
Flue gas temperature at minimum load (80/60°C)
58.7
56.4
56.3
55.3
57.3
56.3
Flue gas temperature at full load (50/30°C)
41.8
39.4
42.4
40.4
42.1
42.6
Flue gas temperature at minimum load (50/30°C)
30.8
30.5
31.5
29.9
31.6
30.9
Waste gas output flow rate at full load
29.5
38.4
41.7
48.7
62.6
77
Waste gas output flow rate at minimum load
9.6
11.8
13.4
14.6
19.7
24.5
CO2at Pmax
9.2
9.6
9.3
9.3
9.4
9.7
CO2at Pmin
9
9.1
9.1
9.1
9.1
9.2
CO O2=0% at Pmax
124
142
171
116
96
140
CO O2=0% at Pmin
18
16
15
10
28
18
NOx O2=0% at Pmax
38.14
39.11
42.75
51.6
37.33
59.58
NOx O2=0% at Pmin
16.05
15.88
13.54
11.34
9.07
8.97
NOx O2=0% weighted
22.39
25.64
24.73
23.95
18.13
31.43

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2.4. Technical Specifications of the Floor Type Condensing Boiler
ONGAS 300 Series
303
304
305
306
307
Efficiency and Performance
Maximum thermal load at heating mode
kW
65
95
119
148
180
Minimum thermal load at heating mode
kW
15
20
19
34
38
Maximum thermal power at heating mode (80/60°C)
kW
62
90
115
142
171
Minimum thermal power at heating mode (80/60°C)
kW
14
19
18
33
37
Maximum thermal power at heating mode (50/30°C)
kW
69
100
124
154
187
Minimum thermal power at heating mode (50/30°C)
kW
16
22
21
37
41
Efficiency at full load (80/60°C)
%
96.2
94.7
96.4
96
95.1
Efficiency at minimum load (80/60°C)
%
93.7
94.8
94.8
96.2
96.4
Efficiency at full load (50/30°C)
%
106.4
105.2
104.3
103.8
103.7
Efficiency at minimum load (50/30°C)
%
107.1
108.3
108
109.4
109.5
Efficiency at partial load (30%) (30°C return temperature)
%
105.8
105.3
105.7
106.2
106.6
NOx class
5
Maximum heating mode setting temperature
°C
80
Maximum domestic water setting temperature
°C
65
Flue waste gas pressure at full load
pascal
230
230
180
210
190
Applied water pressure (min –max)
bar
0.8 - 6
Noise level (at 1 m from the boiler)
dB
35
41
48
52
55
Structural specifications
Water volume
liters
6.5
8.5
10.5
12.5
14.5
Gross weight
kg
112
142
180
218
247
Electrical specifications
Supply
V/Hz
230/50
Protection level
IP
IPX4D
Power consumption
W
190
190
190
310
315
Water and gas connections
Water inlet-outlet diameters
1”
1 ¼”
1 ½”
Gas inlet
1”
1”
1 ¼”
Waste gas outlet (Ø)
80
100
110
125
160
Values for burning
Flue application
B23, C63
C13, C33
B23, C63
Burning efficiency at full load
98.2
98.2
98.3
98.2
98.1
Burning efficiency at minimum load
98.4
98.4
98.5
98.4
98.4
Flue gas temperature at full load (80/60°C)
59.3
60.8
59.9
59.7
61.4
Flue gas temperature at minimum load (80/60°C)
58.7
56.4
55.3
57.3
56.3
Flue gas temperature at full load (50/30°C)
41.8
39.4
40.4
42.1
42.6
Flue gas temperature at minimum load (50/30°C)
30.8
30.5
29.9
31.6
30.9
Waste gas output flow rate at full load
29.5
38.4
48.7
62.6
77
Waste gas output flow rate at minimum load
9.6
11.8
14.6
19.7
24.5
CO2at Pmax
9.2
9.6
9.3
9.4
9.7
CO2at Pmin
9
9.1
9.1
9.1
9.2
CO O2=0% at Pmax
124
142
116
96
140
CO O2=0% at Pmin
18
16
10
28
18
NOx O2=0% at Pmax
38.14
39.11
51.6
37.33
59.58
NOx O2=0% at Pmin
16.05
15.88
11.34
9.07
8.97

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3. INSTALLATION AND COMMISSIONING BOILER
3.1.Packaging and Handling
Products are shipped on pallets as protected by styrofoam and film. The products are fastened to the pallets
with retaining screws. In addition, the products are protected with a wooden case against external impacts.
Appropriate markings are provided on the case. During storage, it may be stored at proper ambient humidity
and temperature without opening the package.
The minimum distances that shall be left from the floor, right and left sides of the device for the installation of
the Condensing Boiler have been calculated by considering the minimum distances required to allow the
personnel to open the covers of the boiler easily and ergonomically.
Recommended minimum distances for wall type boilers:
Recommended minimum distances for floor type boilers:

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19
3.2.Dimensions of the Wall Type Condensing Boiler
3.3.Dimensions of the Floor Type Condensing Boiler
3.4.Instructions for Installation
RIMA ONGAS 300 Series Condensing Boiler shall be placed as follows
- Place the boiler to the boiler room taking the minimum recommended distances into account.
- Remove the gelatin, tapes, pallets and any other packaging.
- All gas appliances shall be installed by authorized persons as required by law. Any error in the installation of
these devices may cause loss of life and property.
- Boilers shall be installed in a place with no risk of frost. When the boiler is not operated, the water remaining
in the radiators shall be drained to prevent freezing.
- Boilers shall not be installed in a location that contains moisture, vapor or dust. Otherwise the boiler shall not
operate correctly and efficiently.
- The floor of the installation location of the boiler shall be stable, firm and wide, and it shall be positioned high
above the ground in order not to be affected by floods.

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- The supply of fresh air shall be free of halogen hydrocarbons (sprays, paints and some chemicals), otherwise
these shall cause corrosion and erosion of the boiler and flue.
- Fresh air intake shall comply with the instructions of the local gas supplier and the instructions for gas
connection, otherwise there is a risk of poisoning.
- Condensate and flue connections shall be made in accordance with the rules and standards.
3.5.Gas Connections
Gas connections shall be performed by authorized personnel or by installation companies with
certification for gas installations.
Sediments and collected particles in old installations, radiators or gas pipes shall be removed before
installation.
The gas connections shall be inspected for leakage before commissioning.
The risk of poisoning or explosion due to the operation and installation of unsuitable gas installations
may result from non-compliance to rules.
A flameproof gas valve shall be used, otherwise there is a risk of explosion in case of fire.
Gas connections shall be made in accordance with the standards and directives.
Perform the gas leak test while the gas control valve is TURNED OFF. Gas valves may be
subjected to a max. pressure of 150 mbar. When this pressure is exceeded, gas valves and
burners may be damaged, and this result in explosions and poisoning. During the pressure test
of the gas compartment, the valve at the inlet of the device shall be turned off. Please note the
type of gas used in the boiler and the instructions for transformation.
Only the original RIMA spare parts and spare parts provided by the authorized local gas representative shall be
used in the flue gas outlet connections. Please read the instructions before connecting the flue.
Local gas distributors may have different directives, so obtain information from your local gas companies or
their representatives.