Ferroli optima 2001 VMF7 Installation Instructions Manual page 27

General Notes - For use on the
*The central heating pump (32) will run to disperse heat if the temperature at the heat exchanger limit thermostat (50) is too high
*The frost thermostat (51) will switch on the boiler for central heating if the temperature is too low.
*Fuse on P.C.B.: 2 Amp.
RY not energised
RY energised
Jumpers JP1 - JP4
Fitted
JP1 No waiting time
JP4 Fan control
High & Low speed
Check operation using LED's as a fault finding guide. First check section A, then B, then C, then D.
0 = LED off 1 = LED on
Domestic Hot water tap open
LED OK
1 1
2 1
3 X
A
4 1
5 0
6 1
CENTRAL HEATING ON
LED OK
1 1
2 0
3 1
4 1
B
5 0
6 1
GENERAL TEST FOR D.H.W. AND CENTRAL HEATING (First check A and B above)
LED/REL. OK
RY2 energised
RY4 energised
C
7 1
IGNITION OF BURNER
D
1 Fan (16) should run at full speed (open hot tap or set controls
so boiler is calling for heat).
2 Check first A, B and C above (LED 6 is ON?)
2001 fitted with VMF7 Printed Circuit Board
RELAY RY
RY1 central heating pump
RY2 on/off relay
RY4 fan
Note
If RY1 is not energised
the Central Heating pump
will run
Not fitted
Waiting time on
Fan control
High speed only/off
x = LED either on/off is not important
(Flow rate greater than 2,5 l/min)
FAULT
0
0
X
0
1
0
Room stat (72) at Max, HW tap closed
FAULT
0
1
0
0
1
0
FAULT
not energised
not energised
0
(AUTOMATIC IGNITION)
2001
°
LED n signification:
1 Mains on/low voltage on
2 Flowmeter (136) on
3 Central heating room thermostat (72) / clock (62) calling
4 Sensor (34) or (42) calling for heat
5 Central Heating waiting time, max. 3 minutes delay following shut off
Boilerstat (63), Clock (62), Roomstat (72) or use of Hot Water
6 Demand for heat - relay (RY2) will be energised
7 Air pressure switch (43) on, air flow checked
OTS (138) = Outside temperature sensor
temp.
10° C
Temp.
25° C
sensor
60° C
(34) (42)
80°C
POSSIBLE CAUSE OF FAULT
No mains electricity/switches off/fuse blown.
D.H.W. flowmeter (136) not operating.
Not required for D.H.W.
- D.H.W. sensor (42) not connected or D.H.W. temperature too high
- Waiting time operating: replace P.C.B.
Short circuit on D.H.W. sensor (42) or resistance lower than 500 Ohm
- C.H. limit thermostat (50) open circuit (pump run)
- C.H. water pressure low (114 open circuit)
POSSIBLE CAUSE OF FAULT
No main electricity/switches off, fuse blown.
Hot water tap open - D.H.W. flowmeter (136) contact closed
Roomstat (72) or clock (62) not calling for heat
- Central heating sensor (34) not connected or
- boiler temperature too high or
- boiler thermostat (61) below CH temperature
Waiting time still operating (max. 3 minutes)
- C.H. sensor (34) short circuit or resistance lower than 500 ohm
- C.H. limit thermostat (50) open circuit (pump will run)
- C.H. water pressure low (114 open circuit)
POSSIBLE CAUSE OF FAULT
Check first A and B above
Air pressure switch (43) not in NC position or miswired:
- check wiring
- fan (16) at low speed remove jumper JP4
- fan (16) not running at full speed or
- air flow too low:
- air pressure switch (43) faulty
3 Check spark and position of spark electrode (81)
4 Check position of flame sensing electrode (82)
5 Check burner gas pressure during ignition
Ohm OTS(138) Ohm
890 ohm -10°C
1000 ohm 0°C
1300 ohm 10°C
1490 ohm 20°C
30°C
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