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PATIBILITY “ALL 27” (fig. 23/21)
When the hydraulic configuration is not
consistent with the selection solar appli-
cation, on the display the anomaly ALL
27 appears. During this anomaly the boi-
ler continues to function normally but for
the board is active in the solar anomaly,
the function is only available antifreeze
collector.
–
COMPATIBILITY INPUT (S3) ANOMALY
ONLY FOR SYSTEM 7 “ALL 28” (fig.
23/22)
When a probe is connected instead of a
clean contact on entry S3 the board on
display shows the anomaly ALL 28.
During this anomaly the boiler continues
to function normally but for the board is
active in the solar anomaly, the function
is only available antifreeze collector.
–
ANOMALY NUMBERS REL ATED
BOARD “ALL 29” (fig. 23/23)
When one of t he boar d ZONA
MIX/INSOL failure or does not communi-
cate, the display shows anomaly ALL 29.
The boiler functional excluding the func-
tion ZONE MIX/INSOL.
–
HEATING RETURN SENSOR ANOMALY
“ALL 30” (fig. 23/24)
When the heating return sensor (SR) is
open or shor t ed, ALL 30 shall be
displayed.
During such anomaly, the boiler will conti-
nue to operate normally.
–
CASCADE DELIVERY SENSOR ANO-
MALY “ALL 31” (fig. 23/25)
When t he cascade deliver y sensor
(SMC) is open or shorted, ALL 31 shall
be displayed. During such anomaly, the
boiler will continue to operate normally.
–
THREE-ZONE SYSTEM CONFIGURA-
TION ANOMALY “ALL 32” (fig. 23/26)
When the boards connected to the RS-
485 are not enough and/or at least one
of them it is not mixing zone board, the
boiler stops and anomaly ALL 32 is
displayed.
The boiler restar ts when the boiler
three-zone system configuration is acti-
vated.
–
RS-485 BOARD COMMUNICATION
ANOMALY IN MODBUS MODE “ALL
33” (fig. 23/27)
When PAR 16 is different from “- -”and
there is no communication between the
boiler board and the RS-485 board in
MODBUS mode for at least four minu-
tes, the boiler stops and anomaly ALL
33 is displayed.
The boiler restarts when communication
is restored or when PAR 16 = “- -” is set.
–
RS-485 BOARD COMMUNICATION
ANOMALY IN CASCADE MODE “ALL
34” (fig. 23/28)
When PAR 15 is different from “- -” and
there is no communication between the
boiler board and the RS-485 board in
CASCADE mode, the boiler stops and
anomaly ALL 34 is displayed. The boiler
restarts when communication is resto-
red or when PAR 15 = “- -” is set.
–
RS-485 AND RS-485 COMMUNICA-
TION ANOMALY “ALL 35” (fig. 23/29)
When PAR 15 is different from “- -” and
there is no communication between the
two RS-485 boards, the boiler stops and
anomaly ALL 35 is displayed. The boiler
restarts when communication is resto-
red or when PAR 15 = “- -” is set.
CAUTION: In t he event of
sequence/cascade connection, error
codes 70 and 71 will appear on the CR
73 remote control display:
- ALARM 70
When an anomaly affects cascade ope-
ration (cascade delivery sensor ALL
31), CR 73 remote control display will
show alarm 70. Verify the anomaly in
the cascade.
- ALARM
71
When an anomaly occurs in one of the
modules and the others keep operating
to the extent permitted, the CR 73
remote control display will show alarm
71. Verify the anomaly in the cascade.
Fig. 23/24
Fig. 23/25
Fig. 23/27
Fig. 23/28
Fig. 23/29
Fig. 23/26
Fig. 23/23
Fig. 23/21
Fig. 23/22
Summary of Contents for MURELLE HM
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