Installation manual

installation manual TWIN 80 EN
29
4.2. Status indications
The left segment (A) indicates:
• status code or
• parameter value in menu mode
The two right segments (B) indicate:
• temperature or system water pressure or
• parameter value (in menu mode)
A dot on the status display indicates: The flame on burner is
present.
4.2.1. Status indication during “normal operation mode”
During normal operation, the status display shows a continuous indication
Status
code
description action repair
--
initialisation after restoration of supply power, pre-purging
O
continuous
stand-by
- no heat demand, pump off, burner off
- once per hour, the difference between flow and return
temperatures must be less than 5°C. If this is not the case,
the pump will be switched on
boiler not required to be on
c
continuous
Heating
post-running, pump
on, burner off
- end of heat demand
- pump is in post-running mode, time-adjustable in menu
h
continuous
DHW combi-boiler and
HWS external cylinder
post-running, pump
on, burner off
- end of heat demand
- pump is in post-running mode, mixing the primary heat
exchanger and internal tank for ½ minute
Heating
heat demand, pump
on, burner off
- burner is in starting-up sequence
- burner starts within 10 seconds
blocked burner caused
by the 3 minutes anti-
cycling timer
- heat demand (heating), pump on, burner off
- however, burner is blocked caused by the anti-cycling
timer
burner starts after 3 minutes anti-
cycling time
blocked burner caused
by maximum working
temperature blocking
(97°C)
If the flow sensor temperature or return sensor
temperature exceeds 97°C, the burner is switched off
block removes when the actual
flow temperature becomes 5°C
below the maximum working
temperature
blocked burner caused
by set point
temperature blocking
burner is off when the actual flow temperature is 3°C
above the set point (desired central heating flow
temperature may be between 25°C - 90°C)
block removes when the actual
flow temperature becomes 5°C
below the set point
blocked burner caused
by difference
temperature blocking
(flow / return difference
< –5°C)
If the temperature difference between flow and return
sensor becomes less than –5°C negative, the burner is
switched off
block removes when the
temperature difference between
flow and return sensor becomes
within –5°C
blocked burner caused
by difference
temperature blocking
(flow / return
temperature > 45°C)
If the temperature difference between flow sensor and
return sensor becomes greater than 45°C, the burner does
not fire-up
block removes when the
temperature difference between
flow and return sensor becomes
less than 20°C
C
continuous
blocked burner caused
by high glow plug
protection counter
- at each ignition the glow plug protection counter is
incremented. If the glow plug counter is too high, the boiler
start will be delayed
in time the glow plug protection
counter removes automatically
A = Status displa
y
B = Reading
C = “+” button
D = “-“ button
E = Set/Reset
F = Flame present