Baxi PRIME Manual

Technical data

		24	28
Rated heat output for DHW circuit (Pn)	kW	24.0	28.0
Rated heat output 80/60°C (Pn)	kW	20.0	24.0
Reduced heat output 80/60°C (Pn)	kW	4.8	4.8
Rated efficiency 80/60°C (Hi)	%	97.7	97.8
Max. pressure of water in heating circuit	bar	3	3
Min. pressure of water in heating circuit	bar	0.5	0.5
Temperature range in heating circuit	°C	25÷80	25÷80
Temperature range in DHW circuit	°C	35÷60	35÷60
Coaxial flue duct diameter	mm	60/100	60/100
Diameter of separate outlets	mm	80/80	80/80
Max. exhaust temperature	°C	80	80
Power supply voltage	V	230	230
Power supply frequency	Hz	50	50
Rated power supply	W	89	94
Net weight	kg	26	26
Dimensions (height/width/depth)	mm	700/395/279	700/395/279

CONSUMPTION AT HEAT INPUT Qmax and Qmin

Qmax (G20) - 2H	m3/h	2.61	3.06
Qmin (G20) - 2H	m3/h	0.52	0.52
Qmax (G30) - 3B	kg/h	1,95	2,28
Qmin (G30) - 3B	kg/h	0,39	0,39
Qmax (G31) - 3P	kg/h	1,92	2,25
Qmin (G31) - 3P	kg/h	0,38	0,38

DESCRIPTION OF THE PRODUCT

General description

This boiler has been designed to heat water to a temperature lower than boiling point at atmospheric pressure. It must be connected to a central heating system and to a domestic hot water supply system according to its performance and power output. The characteristics of this boiler are:

• low polluting emissions;
• high-performance heating;
• discharge of combustion products by means of a concentric exhaust connector or separate flue-air ducts;
• front control panel with display;
• minimal weight and size.

Operating principle

Combustion

The burner heats the heating water that circulates in the heat exchanger. When the temperature values of the combustion gases are below the dew point (about 55°C), the water vapour in the combustion gas condenses in the gas section of the heat exchanger. Heat recovered during this condensation process (latent heat or condensation heat) is transferred to the heating water. The cooled combustion gases flow out through the flue duct. The condensation water, instead, passes through a siphon.

Heating and production of domestic hot water

Boilers for heating and the production of domestic hot water are fitted with an integrated plate exchanger that heats the domestic water. The heated water flows through a three-way valve to the heating system or to the plate heat exchanger. A flow detector signals the opening of a hot water tap to the electronic board which turns the three-way valve to its hot water position and starts the pump. The three-way valve is spring-loaded and requires electrical power only when it switches position.

Main components

	SCHEMATIC DIAGRAM KEY HEATING AND DHW APPLIANCES
1	Heat exchanger (Heating)
2	Hydraulic unit
3	Plate exchanger
4	Safety valve
5	Heating flow
6	DHW outlet
7	Domestic water inlet
8	Heating return
9	Pump (Heating)
10	Three-way valve

Use of the control panel

BUTTON/HANDLE KEY

	Manual adjustment of heating temperature
	Manual adjustment of DHW temperature
	Enabling the flue cleaning function
RESET	Resettable faults

LEGEND OF SYMBOLS ON THE DISPLAY

	Heating function enabled *
	DHW function enabled *
	Outside temperature
	Need for maintenance
	Fault
RESET	Reset the fault manually
	Burner lighting

* the symbol flashes when there is heat demand.

OPERATION

Use of the control panel

BUTTONS AND KNOBS

The knob is for adjusting the CH setpoint between 25°C and 80°C:

• turn the knob clockwise to increase the temperature value and anticlockwise to decrease it. To disable central heating, turn the knob anticlockwise all the way round. The message "oFF" flashes on the display and alternates with the temperature value 25°C. The boiler is in standby.

The knob is for adjusting the DHW setpoint between 35°C and 65°C:

• turn the knob clockwise to increase the temperature value and anticlockwise to decrease it.
• To disable the production of domestic hot water, turn the knob anticlockwise all the way round. The message "oFF" flashes on the display and alternates with the temperature value.

The "Initialisation phase" is enabled before ignition in the case of initial ignition or whenever the power to the boiler is cut out. This procedure involves a set of tests after which the system is vented for a period of 5 minutes.

Start-up

To ignite the boiler correctly, proceed as follows:

• Check that the system pressure is correct (SETTINGS section);
• Power the boiler;
• Open the gas tap (yellow, positioned under the boiler);
• Turn the knob of the central heating circuit to set the required ambient temperature value.
• Turn the knob of the DHW circuit to set the required temperature of the DHW.

Ignition procedure (after the power supply has been turned off)

When the boiler is powered, the following information appears on the display:

1. all symbols alight (1 second);
2. software version (1 second);
3. The message "InI" appears (for a few seconds);
4. All turns off (1 second);
5. The message "Fx.x" appears on the display. (2 seconds);
6. The message "Px.x" appears on the display. (2 seconds);
7. The symbol and the CH flow temperature appear;
8. The boiler and CH system venting phase begins. This phase takes 5 minutes.

At the end of the venting phase, the boiler is ready for operation.

Shut-down

To turn off the boiler, disconnect the electric power supply at the two-pole switch and close the gas tap.

In these conditions, the boiler is not protected against frost.

Frost protection

It is good practice to not drain the entire heating system as filling up with water again could cause unnecessary and harmful scale to build up inside the boiler and the heating elements. If the boiler is not used during the winter and is therefore exposed to the danger of frost, add some specific anti-freeze to the water in the system (e.g.: propylene glycol with corrosion and scale inhibitors). The electronic boiler management system includes a "frost protection" function for the heating system which, when flow temperature falls below 7°C, operates the pump. If the temperature reaches 4°C, the burner runs until the flow temperature reaches 10°C. The burner then turns off and the pump continues to run for 15 minutes.

The function is operative if: the boiler is electrically powered, there is gas, system pressure is normal and the boiler is not blocked.

SETTINGS

Reading out measured values

Press the button to view information on operation of the boiler.

• press the button for 1 second to view the work mode (for example: "t.17" = Deareaton function in progress).
• press the button again for 1 second to view the operating sub-status or the relative work function (for example: "u.00" = The boiler is in stand-by).
• press the button again for 1 second to view the operating temperature for heating: the symbol flashes and the temperature value in °C then appears.
• press the button again for 1 second to view the DHW setpoint: the symbol flashes and the temperature value in °C then appears.
• press the button again for 1 second to view the power level between 1 and 3: the symbol flashes and the relative power level appears.

To exit, press and hold the button for more than 3 seconds.

STATES AND SUB-STATES

• The STATE is the phase of instantaneous operation of the boiler at the time it is displayed.
• The SUB-STATE is the phase of instantaneous operation of the boiler in the STATE at the time it is displayed.

STATE LIST

STATE	DISPLAY
STAND BY	t00
HEAT DEMAND	t01
BURNER LIT	t02
OPERATION IN THE HEATING MODE	t03
OPERATION IN THE DHW MODE	t04
BURNER OFF	t05
PUMP POST CIRCULATION	t06
TURNING OFF THE BURNER TO REACH THE TEMPERATURE SETPOINT	t08
TEMPORARY FAULT	t09
PERMANENT FAULT (A FAULT TO BE RESET MANUALLY)	t10
FLUE CLEANING FUNCTION AT MINIMUM POWER	t11
FLUE CLEANING FUNCTION AT MAXIMUM POWER IN CH MODE	t12
FLUE CLEANING FUNCTION AT MAXIMUM POWER IN DHW MODE	t13
MANUAL HEAT DEMAND	t15
FROST PROTECTION ENABLED	t16
VENTING FUNCTION ENABLED	t17
ELECTRONIC BOARD OVERHEATED (WAIT FOR IT TO COOL DOWN)	t18
RESETTING BOILER	t19

SUB-STATE LIST

SUB-STATE	DISPLAY
STAND BY	U00
DELAY BEFORE CH IS NEXT STARTED	U01
PRE-VENTILATION	U13
PRE-IGNITION OF BURNER	U17
IGNITION OF BURNER	U18
FLAME CONTROL	U19
OPERATION OF FAN WITH DEMAND IN PROGRESS	U20
OPERATION AT SET TEMPERATURE SETPOINT	U30
OPERATION AT LIMITED TEMPERATURE SETPOINT	U31
OPERATION AT MAXIMUM AVAILABLE POWER	U32
LEVEL 1 GRADIENT DETECTED	U33
LEVEL 2 GRADIENT DETECTED	U34
LEVEL 3 GRADIENT DETECTED	U35
FLAME PROTECTION ENABLED	U36
STABILISATION TIME	U37
BOILER STARTED AT MINIMUM POWER	U38
POST-VENTILATION	U41
TURNING OFF FAN	U44
REDUCTION OF POWER FOR HIGH FLUE TEMPERATURE	U45
PUMP POST-CIRCULATION	U60

MAINTENANCE

General

The boiler does not require complex maintenance. It is advisable, however, to have it inspected and serviced on a regular basis. Servicing and cleaning of the boiler must be carried out a minimum of once a year by a qualified professional.

Maintenance message

The symbol appears on the display when the boiler requires maintenance.

Maintenance instructions

Periodically check that the pressure displayed on the pressure gauge is 1 - 1.5 bar, with the system cold. If it is lower, turn the system filling tap installed as instructed in Venting the installation section. It is advisable to open the tap very slowly in order to vent the air.

The boiler is fitted with a hydraulic pressure switch which prevents the boiler from working if there is no water.

If pressure drops occur frequently (monthly basis), have the system checked by the Authorised technical service agent.

Filling the installation

The filling knob is light blue and located under the boiler, as shown in the picture to the side. To fill the system, proceed as follows:

• Pull the knob (A) downwards to release it from its seat.
  
• Slowly turn the knob anticlockwise (to the left) to fill the system. Do this by hand without using any tools.
• Fill the system until the reading on the pressure gauge (B) is between 1.0 and 1.5 bar.
• Close the tap and check that no water leaks out.

Periodically check the reading on the pressure gauge (B) when the system is cold. If the pressure is low, turn the valve to increase it again.

Venting the installation

It is essential to eliminate any air in the boiler, pipes or fittings because this can cause irritating noise during heating or the intake of water.

To do this, proceed as follows:

1. Open the valves of all the radiators connected to the central heating system.
   
2. Set the ambient thermostat as high as possible.
3. Wait for the radiators to heat up.
4. Set the ambient thermostat as low as possible.
5. Wait about 10 minutes until the radiators have cooled down.
6. Vent the radiators. Start with the lower floors.
7. Open the vent valve holding a cloth against the valve.
   
8. Wait until water comes out of the vent valve and then tighten it again.
9. After venting, check that the system is still at sufficient pressure.

Take care as the water might still be hot.

If the hydraulic pressure of the water in the central heating system is below 0.8 bar, it is advised to increase the pressure (the recommended hydraulic pressure is 1.0 - 1.5 bar) as described in SETTINGS section.

Draining the installation

The drain knob is located under the boiler, as shown in the picture to the side. To drain the system, proceed as follows:

• Slowly turn the knob (C) anticlockwise (to the left) to open the valve. Do this by hand without using any tools.
  
• After draining, close the valve.

TROUBLESHOOTING

Different messages appear on the display according to the type of fault.

• VOLATILE FAULT (b.x.x.)
  The volatile fault is identified on the display with the letter "b" followed by a number (two-digit fault code). The volatile fault is a type of fault that stops the boiler temporarily and disappears as soon as the cause has been resolved. If a volatile fault repeats itself at a certain frequency, the fault becomes permanent as described below.
• PERMANENT FAULT (E.x.x)
  The permanent fault is identified on the display with the letter "E" followed by a number (two-digit fault code). Press and hold down for at least 3 seconds. The boiler enters "venting" mode for 5 minutes.
  If faults are displayed frequently, call the Authorised Service Centre.

Press and hold down for at least 5 seconds. The status signals flash and the boiler enters reset mode. The boiler also triggers a purging cycle which takes about 4 minutes.

Error codes

TEMPORARY FAULT

DESCRIPTION	VISUALIZATION
INCORRECT BOARD SETTINGS	b00
MAXIMUM FLOW TEMPERATURE VALUE REACHED	b01
FLOW TEMPERATURE INCREASING TOO FAST	b04
MAXIMUM DIFFERENCE BETWEEN FLOW AND RETURN TEMPERATURE REACHED	b07
INCORRECT CONFIGURATION SETTINGS (C1,C2)	b17
AWAITING ENTRY OF CONFIGURATION SETTINGS (C1,C2)	b19
EXTERNAL BOILER SENSOR NOT CONNECTED	b26
RESETTING BOILER	b28
NO CIRCULATION OF WATER	b30

PERMANENT FAULT (REQUIRING RESET)

DESCRIPTION	VISUALIZATION
MAXIMUM SAFETY TEMPERATURE VALUE REACHED	E12
IGNITION OF BURNER FAILED AFTER 5 ATTEMPTS	E14
FAILED IGNITION TO DETECT PARASITE FLAME	E16
FLOW TEMPERATURE SENSOR SHORT-CIRCUITED	E32
FLOW TEMPERATURE SENSOR NOT CONNECTED	E33
INCORRECT FAN SPEED	E34
TEMPERATURE MEASURED BY RETURN SENSOR GREATER THAN FLOW TEMPERATURE	E35
LOSS OF FLAME DETECTED 5 TIMES IN 24 HOURS (WITH BURNER ON)	E36
NO COMMUNICATION BETWEEN GAS VALVE AND BOILER BOARD	E37
LOW PRESSURE IN HEATING CIRCUIT	E42
NO CIRCULATION OF WATER	E43
NO CIRCULATION OF WATER AFTER VENTING PHASE	E45
GAS VALVE FAULT	E52
JUMPER 1 STATUS CHANGE	E53
JUMPER 2 STATUS CHANGE	E54
JUMPER 3 STATUS CHANGE	E55
FUME SENSOR SHORT-CIRCUITED	E56
FUME SENSOR NOT CONNECTED	E57
MAXIMUM FUME TEMPERATURE VALUE REACHED	E58
TEMPERATURE READING TOO HIGH/LOW (SENSOR MAY BE FAULTY)	E72 – E73
FAULT WITH GAS VALVE CONTROL CIRCUIT	E74

DECOMMISSIONING

Decommissioning procedure
Before disassembling the device, check that it is has been disconnected from the mains and that the gas tap upstream of the boiler has been shut.

SAFETY

The appliance can be used by children aged 8 or over and by people with reduced physical, sensory or mental faculties, or who do not have the required experience or knowledge, provided they are supervised or have received instructions on using the appliance safely and understanding its intrinsic hazards. Children must not play with the appliance. The cleaning and maintenance operations reserved to the user must not be performed by unsupervised children.

General safety instructions

SMELL OF GAS

• Switch off the boiler.
• Do not activate any electrical device (such as switching on the light).
• Put out any naked flames and open the windows.
• Call an Authorised Service Centre.

SMELL OF COMBUSTION FUMES

• Switch off the boiler.
• Open all the doors and windows to ventilate the room.
• Call an Authorised Service Centre.

FLAMMABLE MATERIAL
Do not use and/or store highly flammable material (thinners, paper, etc.) near the boiler.

SERVICING AND CLEANING THE BOILER
Switch off the boiler before working on it.

Once a year, have the device serviced by a qualified technician who should provide an undersigned maintenance certificate.

Recommendations

Only qualified technicians are authorised to service the device and system.

The appliance is not intended to be used by persons with reduced physical, sensory or mental capacities, or who lack experience or knowledge, unless, through the mediation of a person responsible for their safety, they have had the benefit of supervision or of instructions on the use of the appliance.

Make sure that the device remains physically connected to the mains to ensure that the safety functions, like the pump antiblock function and frost protection, continue to operate.

Do not leave any packaging (plastic bags, polystyrene, etc.) within the reach of children as they are a potential source of danger.

Periodically check the pressure of the system (minimum pressure 0.8 bar, recommended pressure 1-1.5 bar).

Do not remove or cover the identification plates and labels on the device. These must remain visible for the entire useful life of the device.

Failure to observe the above will render the warranty null and void. The names of the Authorised Service Centres are indicated in the attached sheet. Prior to commissioning, remove the protective plastic coating from the boiler. Do not use any tools or abrasive detergents to do this as you may damage the painted surfaces.

Liabilities

RESPONSIBILITIES OF THE PRODUCER

Our products all have marking. As our company constantly strives to improve its products, it reserves the right to modify the information given in this document at any time and without notice. This document is issued purely for the sake of information and should not be considered as a contract with third parties. As the producer, we cannot be held responsible for the following:

• Failure to observe the instructions on installation of the device.
• Failure to observe the instructions on use of the device.
• Negligent or insufficient maintenance of the device.

RESPONSIBILITIES OF THE INSTALLER

The installer is responsible for installation and commissioning of the device. The installer must follow the instructions below:

• Read and observe the instructions in the manuals provided with the device.
• Install the device in compliance with the laws and standards in force.
• Perform commissioning and all necessary checks.
• Explain installation to the user.
• With regard to maintenance, inform the user of the need to check the device regularly and to keep it in good working order.
• Provide the user with all the instruction manuals.

RESPONSIBILITIES OF THE USER

To guarantee successful installation, proceed as follows:

• Read and observe the instructions in the manuals provided with the device.
• Request the assistance of a qualified installer for installation and initial commissioning.
• Ask the installer to explain the operation of the gas boiler.
• Entrust any servicing and inspections to a qualified installer.
• Keep the manuals in good condition and in a safe place near the device.

This device is not intended to be used by people (including children) who have restricted mental, sensory or intellectual abilities or who have a lack of technical knowledge. These people are allowed to use the device only if supervised or trained in use of the device by a person responsible for their safety. Do not allow children to play with the device.

ABOUT THIS MANUAL

General

This manual is intended for the user of a PRIME boiler.

Symbols used

Risk of damage to or malfunction of the appliance. Pay special attention to the warnings concerning danger to people.

Wait for the appliance to cool down before working on the parts exposed to heat.

HIGH VOLTAGE
Live components - electrocution hazard.

DANGER OF FREEZING
Possible formation of ice due to low temperatures.

Information to read with particular care as it is useful for the correct operation of the boiler.

GENERIC PROHIBITION
It is forbidden to do/use the things indicated alongside the symbol.

Documents / Resources

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