Morco FEB-24ED - SEQUENCES AND ELECTRICAL DIAGRAMS; Lighting Up Sequences

Description of functioning
technical
53
3.4.- Lighting up Sequence and Electrical Circuit
DHW start sequence FEB-24ED
DHW DEMAND
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Low pressure
switch closed
RE-START
SE
QUENCE
DHW
MODULATION
Wait until Heating
temperature goes down
FA
N ON
PUMP OFF
Lock out F-3
3 Min.Lock out F-2
FA
N OFF
PUMP OFF
6 Min.Lock out F-2
FA
N OFF
PUMP OFF
Flame detection before
6 secon
ds?
Open EV1 and EV2
Open gas valve at
lighting pressure
SPARK
MAX 6 SECS
Heating Temp <DHW
set point + 20º C
Heating Temp <DHW
set point + 20º C
PUMP ON
Air pressure
switch closes?
FAN ON
Air pressure
switch open?
47