Morco FEB-24ED Guida
FEB-24ED TECHNICAL DOCUMENTATION
01-12-08 version 1.0
1- WARNINGS AND PRECAUTIONS ..........................................1
2 - FEATURES ............................................................................................................2
3 - DESCRIPTION OF FUNCTIONING.......................................................................5
3.1.1 General description .......................................................................................................5
3.1.2 Hydraulic Circuit ............................................................................................................4
3.1.2 PCB (Photograph).........................................................................................................9
3.1.3 Gas Circuit .................................................................................................................. 14
3.1.4 Air circuit..................................................................................................................... 18
3.2 - External auto test functions...........................................................................................19
3.3- On board auto test functions and boiler configuration set up........................................26
3.4 -Trouble shooting + lock out codes................................ .................................................32
3.5- Trouble shooting Flow charts..........................................................................................36
3.6- Assembly and disassembly hydraulic unit.......................................................................44
3.7- Functional flow charts..................................................................................................... 47
3.8- PCB Schematic drawing..................................................................................................53
Warnings and precautions
technical
1.- Warnings and precautions
In order for the boiler to function correctly, it is vitally important for the appliance to
be correctly adjusted on installation in accordance with gas installation regulations.
Boiler installation must comply with the conditions described by in the user and
installation manual provided with the appliance
IImportant: Please read the user and installation manual
for this boiler carefully.
1
PLEASE NOTE THAT THE FAULT CODES AND SOFTWARE DIFFER
FROM THE FEB24E FAULT CODES. ALWAYS USE THIS MANUAL FOR
FAULT FINDING AND TROUBLE SHOOTING ON THE FEB24ED
Features
technical
2
2.- Features
The boiler FEB-24EDis a wall hung, room sealed, fan assisted,
microprocessor controlled fully modulating gas combination boiler for providing both
central heating and domestic hot water.
The boiler hasa continuous electronic modulation field. The 24kW boiler has an
output power of between 7.6 kW and 23.7 kW (6,536 and 20,382 Kcal/h).
FEB-24ED
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1. Central heating thermistor
2. Air pressure switch
3. Fan
4. High limit stat
5. Copper heat exchanger
6. Expansion vessel
7. Combustion chamber
8. Ionisation electrode
9. Ignition electrodes
10. Circulation Pump with
Automatic Air Vent
11. Modulating gas valve
12 Hydraulic assembly
13. DHW thermistor
14. Safety valve
15. Pressure gauge
16. Pcb acess panel
17. Control panel
18. Time clock
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Features
technical
3
Technical data:
Models FEB-24ED
Category II2H3P
Type C12, C32, C42, C52, C82,
B22
Central heating performances Maximum
output kW 23,7
kcal/h 20.382
Minimum
output kW 7,6
kcal/h 6.536
Domestic hot water performances Maximum
output. kW 23,7
kcal/h 20.382
Minimum
output kW 7,6
kcal/h 6.536
Domestic hot water flow 25ºC increase (l/min) 13,6
Domestic hot water flow rate (l/min) 10
(34ºC increase)
Minimum flow rate for activating D.H.W. (l/min) 2
Operating pressure (bar) Maximun Central heating 3
Maximun D.H.W. 10
Minimum D.H.W.activation 0,3
Expansion vessel capacity (L) 7
Temperature selection range (ºC) Central heating
circuit Floor Heating 40-60
Radiators 60-85
D.H.W.circuit 35-60
Gas inlet pressure (mbar) Natural G20 20
Propane G31 37
Gas consumption (Hi) Natural G20 (m³/h) 2,78
Propane G31 (kg/h) 2,1
Electrical suplly (V/Hz) 220-230V~50Hz
Max power consumption (W) 120
Dimensions (mm) Height 680
Width 390
Depth 250
Connections / Interior Ø in (mm) Gas Inlet ¾”/Ø18
Domestic cold water Inlet ½”/Ø15
Domestic hot water Outlet ½”/Ø15
Central heating Flow ¾”/Ø22
Central heating return ¾”/Ø22
Flue gas exit temperature (ºC) 140
Net weight (kg) 29
Gas type Natuaral G20 X
Propane G31 X
CE type examination certificate 99BN794
NOx (according to prNE483) 3
Degree protection IP-44
Directive 92/42/CEE ٭٭
3
Description of functioning
technical
5
3.- Description of functioning
3.1.- General description
3.1.1.- Hydraulic Circuit
Hydraulic Circuit
FEB-24ED
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1. Expansion vessel
2. Pump
3. Low pressure switch
4. Central heating thermistor
5. Three way valve
6. High limit stat
7. Air pressure switch
8. Venturi
9. Fan
10. Sealed air box
11. Copper heat exchanger
12. Combustion chamber
13. Ignition electrodes
14. Main burner
15. Ionisation electrode
16. Modulating gas valve
17. Gas inlet
18. D.H.W Thermistor
19. Hot water outlet
20. Plate heat exchanger
21. C.H. Flow
22. Cold water inlet
23. C.H. Return
24. Safety valve
25. By-pass
26. C.H.Drain valve
4
Description of functioning
technical
6
Filling the heating circuit:
In order for the boiler to function correctly, the heating circuit pressure must be at
around 1.6b when it is cold.
Both the boiler and the heating installation must be correctly purged,as air in the
water pipes can cause excessive noise and malfunctioning.
The boiler has an automatic drain valve incorporated to the pump body.
The radiators and upper areas of the heating circuit should be provided with an auto-
matic drain valve.
The procedure for correct filling of the installation is as follows:
- Fill the heating circuit by slowly opening the filling valve .
- Close the filling valve when the water pressure gauge shows that a pressure of 1.6
bars has been reached.
- Ensure there is no water leakage from the installation or boiler. Check all the con-
nections thoroughly.
Domestic Hot Water Functioning (DHW):
Water begins to circulate through the domestic circuit of the boiler. The cold water
flows through the 3-way valve, this action ports the 3 way valve and micro switch into
DHW mode.
Water heated in the primary circuit flows through the plate heat exchanger to heat up
the water coming from cold mains water supply. As the cold water circulates, it is
heated up in the plate heat exchanger.
The temperature of the DHW is controled by the DHW thermistor, and limited for safety
Heating Functioning:
The pump starts up and water begins to circulate through the radiator circuit. The fan
and the burner then start up. The heating output temperature is controlled at all times
by the heating thermistor.
Draining the heating circuit:
The boiler has a drain valve incorporated for drai-
ning the heating circuit when necessary. The safety
valve mustn’t be used for this purpose.
5
Description of functioning
technical
7
Description and function of the hydraulic components:
Compact hydraulic unit: (Part number MCB2190)
This unit consists of various hydraulic components: circulating pump, safety valve,
drain valve, plate heat exchanger, 3-way valve, flow restrictor, automatic drain valve
and automatic bypass. All these together form a compact unit.
Radiators
Hot water outlet
Return
Primary heat
exchanger
Primary heat
exchanger
1
5
6
23
4
1. Pump 4.Plate heat exchanger 7. DHW Thermistor
2. Pressure relief valve 5.Three way valve
3. Draining valve 6.Automatic air vent
Circulating pump head:(Part number MCB3050)
Operates in both CH and DHW mode. Circulation of the primary circuit either to the
radiators or to the plate heat exchanger when operating in DHW mode.
Pump combines a manual and automatic anti-blocking system
The capacity of this pump has a mamometric head of 5 metres for the 24kW boiler.
Safety valve:
Also called an overpressure valve, Its function is to prevent the heating circuit exceed
ing 3.0b pressure. DO NOT USE FOR DRAINING BOILER
CO
cold water
inlet
DHW THERMISTOR
7
6
Description of functioning
technical
8
Drain valve:
This component allows the heating circuit to be drained.
Finger operated located to the right hand side of the
safety valve. (Part number MCB2180)
3 Way valve:
Integrated within hydraulic unit, operates whenever a hot
tap is opened.
This action activates the micro switch and ports the primary
circuit away from the radiators to the plate heat exchanger
In order to produce hot water at the taps.
(Part number MCB2190 Complete unit)
Micro switch
Located on the 3 way valve brass diaphragm housing. Activation
ocours when the white switch tip which sits on the diaphragm
push rod in CH mode is released as the diaphragm push rod
ports the 3 way valve to DHW.
This action places the PCB into DHW mode allowing the boiler
to commence the ignition sequence.(Part number MCB2320)
Flow restrictor
Located within the hydraulic unit between the brass inlet
union and the cold inlet port on the hydraulic unit.
This component restricts the flow of water into the boiler
to 10 litres per min.(Part number MCB2240)
NOTE
THIS RESTRICTOR IS NOT SUPPLIED WITH NEW
HYDRAULIC UNITS. ALWAYS ENSURE THAT THIS ITEM
IS REPLACED INTO THE HYDRAULIC UNIT IF ANY WORK IS
CARRIED OUT ON THE HYDRAULIC UNIT
MCB2240
MCB2320
MCB2180
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Description of functioning
technical
9
Expansion vessel: (Part number MCB2005)
The expansion vessel is a hermetically closed receptacle with two chambers separa-
ted by an SBR membrane. One chamber contains nitrogen (air) and the other is filled
with the water from the heating circuit. It has a capacity of 7 litres.
The function of the expansion vessel is to absorb the increase in volume of the hea-
ting circuit water when it is heated up.
The amount of expansion by the expansion vessel depends on the temperatu-
re selected by the user for the heating circuit,and on the total volume of the heating
circuit.
Automatic bypass:
The bypass is located inside the hydraulic unit. It joins the heating outlet and return.
It is preset, only opening when the pressure between the bypass inlet and outlet exceed
0.3 b
Its purpose is to assist when there is a large loss of load in the circuit and the pump
consequently has difficulty in moving the water. When the bypass opens, an amount
of water which was flowing towards the radiators is made to circulate directly to the
return pipe, thus making the work of the pump easier.
Central heating low pressure switch: (Part number FCB1480)
This indicates the pressure inside the heating circuit
is correct. If the pressure is under 0,5 bar the switch
opens and the boiler locks out (F3)
The expansion vessel pressure is 1 bar, with zero pressure in
the heating circuit
I
FCB1480
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