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Maintenance and Service Life:

 Warmhaus room thermostat should not 

come into contact with water or excessive humidity. Unless an external 
damage occurs, the room thermostat does not require any maintenance.

3.2.7. Use of Outside Temperature Sensor (Optional)

Outside Weather Temperature Sensor (optional) can be installed in your 
combi by our Authorized Service (see: Installation Section; Accessory 
Connection Scheme), and you can enable automatic temperature adjustment 
for the radiator with immediate responses to outside weather temperature 
changes via smart and comfort operation. Therefore, it maintains an efficient 
and economic operation by reducing the radiator water temperature when 
outside weather temperature increases and gradually increasing the radiator 
water temperature when outside weather temperature decreases and sets 
you free from making radiator temperature adjustments. This sensor is 
activated when connected independently from the typology or availability 
of used thermostat, the relation between output temperature and outside 
temperature is defined according to curves given in the graphic below based 
on position of button located on the combi panel.

After connecting the Outside Sensor, adjustment is made according to 
average external weather temperature of your province with P04 parameter. 
Our authorized service will make this adjustment during installation.

3.2.8. Customizing Combi Features

As your combi has an advanced electronic card, operation conditions and 
certain parameters related with your preferences may be changed by our 
Authorized Service. Please consult our authorized service when any changes 
requested in below given parameters.

(P07) Controlled Power Increase Period.

When combi starts, it uses a controlled period defined for reaching the 
adjusted maximum heating power. This period is adjusted as 3 minutes as 
standard and can be increased up to 3 minutes.

(P08) Radiator (Heating) Power.

with actual heat requirement of installation place. Thus, the combi 
automatically operates with variable gas flow rates depending on heat load 
of installation between the minimum and maximum power. 

(P21) Lowe temperature region selection.

This parameter should be adjusted as 1 for ground heating or heating systems 
operating with low temperature. 0 (zero) value is selected for radiator 
systems to operate at high temperatures as standard.

(P24) Child Protection

This parameter is not active as standard, please consult our Authorized 
Service for activating the parameter (Protection lock is activated when 
parameter is adjusted as 1). Buttons are locked after 2 minutes following use 
of buttons when the function is active. Keylock is opened when the MODE 
button is hold until cycle is completed for getting off the child protection. 
Your combi is under control against setting changes upon activation of this 
feature.
 

(P40) Radiator ignition delay period.

Combi device is equipped with an electronic timer for preventing frequent 
ignition by the combi during heating stage. This period is adjusted as 2 
minutes as standard and can be increased up to 10 minutes.

(P42) Ready Hot Water (Pre-Heating passive/active).

In order to rapidly prepare without waiting for your hot tap water request 
and reducing the cold water consumption during waiting, grid water is 
heated in the plate exchanger and ready hot water is stored. This function is 
displayed on 6 buttons PriwaPlus LCD Screen.

Activation of this function in PRIWA PLUS, PRIWA ErP PLUS and ENERWA 
models is performed with parametric adjustment by our Authorized Service 
depending on your request. 

Air Discharge Function

It is possible to activated deaeration function pressing RESET and ”-“ for 
circle time. 

“Air” indication is activated on LCD. 

During this function pump and 3-way valve are activated/deactivated in 
order to have deaeration of the hydraulic plant. 

This function ends pushing again RESET and ”-“ for circle time or at the end 
of deaeration time: 12 minutes.

Figure 49 

Boiler controlled by Outside Sensor

Figure 51  

Reset and buttons MAX position

Figure 50 

Outside weather temperature sensor operation curves

Boiler Se

tpoin

°C

Outside Temperature 

°C

Summary of Contents for EWA 28

Page 1: ...CONDENSING COMBI BOILERS INSTALLATION USER MANUAL EWA24 EWA28 EWA33...

Page 2: ...EWA 24 EWA 28 EWA 33...

Page 3: ...mptying Radiator Installation 13 2 3 3 Circulation Pump 15 2 3 4 Controls for Initial Operation of Combi 15 2 3 5 Parts Comprising the Combi 16 2 4 COMBI FLUE CONNECTIONS 16 2 4 1 Exhaust Gas Flue Pip...

Page 4: ...and instructions provided by the manufacturer under any circumstances during installation use or maintenance operations and device warranty shall also be void Only the authorized Warmhaus Service is...

Page 5: ...YES II 2E 3P Natural Gas 20 mbar 25 mbar G20 Available Available Not Available BE FR YES II 2H3B P Natural Gas 20 mbar G20 Available Available Not Available AT CH CY CZ DK EE FI GR IT LT NO RO SE SI...

Page 6: ...es operating with natural gas and your gas meter Immediately evacuate the place with gas odour Natural Gas Emergency Line from your neighbour or another suitable place Do not make any intervention on...

Page 7: ...Figure 2 User s Guide Figure 5 Exhaust gas flue set 471 1000 GAS G3 4 G3 4 G3 4 80 mm 65 mm 65 mm 64 mm 725 mm 592 mm 422 mm G1 2 G1 2 75 mm 73 mm 110 m m 114 mm OPTIONAL Ewa Priwa ERP Priwa ERP Plus...

Page 8: ...r semi full brick wall according to installation scheme and with connection screws and not to be used for other purposes In case of using different materials for installation combi shall be out of the...

Page 9: ...2 2 7 In Case of Using LPG Tank LPG use is recommended for heat requirements over 24 kW New LPG stock tanks may contain settled gas residues nitrogen however that pauperises the mixture assigned to t...

Page 10: ...ceptable to use gas and water connection pipes for earthing WARMHAUS A cannot be held as responsible for any damages and losses on individuals or commodities arising from failing to provide earth conn...

Page 11: ...ensor is activated when connected as independent from the used room thermostat typology and functions as common with room thermostats The relation between installation input temperature and exterior w...

Page 12: ...0 600021 WT RF03 Large Screen Modulated Weekly Program Scheduled Wireless room thermostat Product code 153 11 660 600022 150 cm Min 30 cm Room thermostat shall be mounted 1 25 to 1 5 m above the groun...

Page 13: ...d in the hot tap water Hydrophore should be used if required Prior to filling the radiator installation it must be flushed and all wastes must be cleaned Warning In order to prevent invalidity of devi...

Page 14: ...mum 3 storey buildings Drainage and Ventilation Pipe Min 19 mm Water Air proof insulation Figure 2 26 Connection of condensate Drainage Pipe to External Soil Vent Stack Connection of Condensate Draina...

Page 15: ...ppointment request Gas opening approval certificate should be taken from the local gas company for your gas line Combi electricity connection should be made via 2 or 3 Amps fuse Figure 22 Ewa 28 Ewa 3...

Page 16: ...on of hermetic combi should be original Warmhaus flue sets and they should be used by considering measurements and restrictions given in installation instructions In case of using exhaust gas pipe and...

Page 17: ...ontent 10 00 tolerance 0 5 0 5 maximum allowable draught and maximum allowable pressure difference between combustion air inlet and flue gas outlet including wind pressures 120 Pa characteristics and...

Page 18: ...t are given technical table c combustion product mass flow rate at minimum heat input allowed by the controls are given technical table d G20 CO2 or O2 content of the combustion products at nominal op...

Page 19: ...H C R A I J K I L S B T U Likely flue positions requiring a flue terminal guard Figure 32 Environmental locations of flue Terminal Position with Minimum Distance mm A1 Directly below an opening air br...

Page 20: ...5 mm when compared with the external pipe For security purposes combi suction discharge flue should not blocked even temporarily 1 90 bend 2 Sealing gasket 3 Sealing gasket 4 Centering wire 5 Exterio...

Page 21: ...sed for 80 intake and exhaust pipes is 30 metres regardless from whether they are used for intake or exhaust Figure 41 Vertical flue set installation application Figure 42 Hermetic flue type installat...

Page 22: ...rill fitted The air pipe can be situated at the side or beneath the flue pipe to a minimum dimension of 140 mm see Table 1 It must not be sited above the flue pipe The flue and air pipes must extend b...

Page 23: ...apter L 1533 153 11 660 600013 60 100 Condensed Flue Extension L 500 mm 153 11 660 600014 60 100 Condensed Flue Extension L 1000 mm 153 11 660 600015 60 100 Condensed Flue Extension L 2000 mm 153 11 6...

Page 24: ...m 153 11 660 600092 80 Condensed Twin Flue Extension Pipe L 1000 mm 153 11 660 600093 80 Condensed Twin Flue Extension Pipe L 2000 mm 153 11 660 600094 80 Twin Flue Bend 90 153 11 660 600095 80 Twin F...

Page 25: ...minals For GB recommendations are given in BS 5440 Pt 1 For IE recommendations are given in the current edition of I S 813 Domestic Gas Installations 2 If the terminal discharges onto a pathway or pas...

Page 26: ...ut is not blocked If a room thermostat or control device is connected ensure that it is at ON position If you will shut off the combi for a long period perform below written operations Discharge the r...

Page 27: ...he combi and eliminating the failure in case of combi failure MODE Winter Summer OFF mode is used for position adjustment Operating positions and related notifications POSITION EXPLANATIONS CLOSED or...

Page 28: ...re adjustment buttons see Figure 39 between 25 80 C screen lights when buttons are pressed and C symbol flashes besides the radiator temperature value If you have a ground heating system as our Author...

Page 29: ...ght turns off Analogue manometer is located near to right bottom side of the combi Installation pressure should be seen in this manometer even in the absence of electricity If you have a ground heatin...

Page 30: ...ment of installation place Thus the combi automatically operates with variable gas flow rates depending on heat load of installation between the minimum and maximum power P21 Lowe temperature region s...

Page 31: ...4 RESET boiler and check if problem removed 5 Call for authorised service at first E 07 Safety thermostat intervention Boiler does not work E07 error code flashing on the screen Lack of water on the...

Page 32: ...removed 5 Call for authorised service at first E 28 Maximum allowed consecutive lock out reset reached Usable RESET number reached Too many consecutive lock out failures followed by reset due to other...

Page 33: ...ssure Aging or rust on the electrode Recirculation on fluegas path Blokage on flue or wrong flue Electrode position Cabeling disconnections Combustion calibration Electronic board Gas valve failiure 1...

Page 34: ...lve failiure Electronic board 1 Call for authorised service at first 2 Check wrong flue OR flue gas blockage 3 Check recirculation flue gas leak from flue gas path to fresh air side check flue gas sea...

Page 35: ...least execute maintenance operations on a yearly basis in compliance with what is stated in the relative point at annual check and maintenance of the appliance in compliance with national regional or...

Page 36: ...400 2400 2400 Pump Energy Efficiency Index EEI 0 20 0 20 0 20 Domestic Hot Water Circuit Maximum DHW Heat Input kW 25 8 29 7 34 2 Minimum DHW Heat Input kW 3 5 3 75 4 35 Max Domestic Hot Water flow ra...

Page 37: ...on was determined by applying the spesifications of the relevant European directives Differences to product information listed elsewhere may result in different test conditions Only the data that is c...

Page 38: ...ual electricity consumption AEC kWh 26 37 34 39 42 Water Heating Energy Efficiency hwh 81 84 83 84 82 Daily fuel consumption Qfuel kWh 14 809 23 152 23 615 23 078 29 317 Annual fuel consumption AFC GJ...

Page 39: ...been carefully prepared but we reserve the right to make changes and improvements in our products which may affect the accuracy of the information contained in this leaflet All goods are sold subject...

Page 40: ...Ewa Installation User Manual code 150 11 606 000075 Revision Date R00 05 2019 EWA24 EWA28 EWA33 CONDENSING COMBI BOILERS INSTALLATION USER MANUAL...

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