- 17 -
OPERATION
The monitoring of flue gas temperature is not
classed as a function related to safety, but is a prio-
rity factor in the control of the boiler.
- The boiler operates at minimum power if the flue
gas temperature exceeds 85°C,
- The boiler is on "Stand-by" if the flue gas tempe-
rature reaches 88°C.
The boiler can only be restarted automatically after
15 minutes if there is no longer a fault.
The information from the return sensor is used in the
event of a very low flow (large
D
T) (reduction in bur-
ner power or shut-down of the burner).
It is also enabled for cascade connection.
This is a priority function with respect to the control
of the boiler.
- the power of the boiler is limited if the pressure is
above 4 bar,
- the boiler reduces power to 20% if the pressure in
between 0.2 and 0.4 bars (fault code is dis-
played),
- the boiler sets of an alarm and the pump stops if
the pressure is lower than 0.2 bars (alarm code is
displayed).
The boiler must be reset to clear the fault position if
the minimum value has been exceeded.
To prevent the boiler from cutting out suddenly, the
power failure differential is adjusted according to the
real temperature curve of the boiler.
To enable this function, press the clean key (6) until
the red LED (11) lights up then release it. The LED
(11) then starts flashing once per period. The signal-
ling coded “SF” is displayed on the screen (13).
Heating takes place at maximum calorific power un-
til arriving at the maximum temperature TKSmax.
To disable the cleaning function, press on the clean
key (6) for 3 seconds then release it.
The regulator shut-down function enables the fan
motor speed to be set manually via a domestic hot
water temperature potentiometer (3), and therefore
the heat output of the boiler.
- Press the clean key (6) for longer than 8 seconds,
• The red LED (11) flashes twice per period.
• The codes
appear on the display
(13) and flash twice. This code corresponds to
the percentage of the boiler heating rate.
The safety function and the “all or nothing” regulator
are operating.
To disable the regulator shutdown function, press
the clean key (6) for 3 seconds then release it.
3.6 - Monitoring of flue gas temperature
3.7 - Boiler return temperature control
3.8 - Monitoring of hydraulic pressure
3.9 - Anti-short burner cycle protection
function
3.10 - Cleaning function
3.11 - Regulator shutdown function
j
bar
Info
°C
Reset
6
11
13
RAMO-SF
Fig. 10
j
bar
Info
°C
Reset
6
11
13
RAMO-AR
j
bar
Info
°C
Reset
6
11
13
RAMO-AR
Fig. 11
Summary of Contents for THI 10-50c
Page 61: ... 64 XII NOMENCLATURE THRi 10 50 C ...
Page 64: ... 67 NOMENCLATURE CONTROL BOX ...
Page 66: ... 69 NOTES ...
