37
– take the combustion data reading
– press the button
y
to exit the "Chimney sweep Procedure”.
The boiler water delivery temperature will appear on the
display
– disconnect the pressure gauge, carefully close the pressure
point (6), test for gas tightness, put the control panel back
to the original position and refit the front panel (2). Now
conduct a flue gas analysis as detailed in APPENDIX 2.
Gas supply pressure
Type of gas
G20
G31
Pressure (mbar)
19
36
NOTE: There are negligeable losses of working gas pressure
attributable to the boiler as the gas cock is connected directly
to the gas valve.
7.8
Domestic hot water comfort function
(preheating)
Murelle Advanced HE ErP
models have a "domestic hot water
comfort" function which ensures the best performance in
terms of domestic hot water, reducing the time necessary
for the hot water to become available and ensuring that the
temperature is stable.
To activate the function:
– select parameter”PAR 22” (see "Parameter setting and
display") and set it to value 1
– exit parameter settings and press button
>
for approximately
5 seconds until the symbol
r
and
R
appears on the
display and begins to flash indicating that the function has
been activated.
To deactivate the function:
– press button
>
again for approximately 5 seconds until the
symbols
r
and
R
appear on the display and begin to
flash indicating that the function has been deactivated.
7.9
Gas conversion
Murelle Advanced HE ErP
models can work with G20 or G31
without the need for any mechanical conversion. Simply select
parameter”PAR 03” (see "Parameter setting and display"
page 32) and set the type of gas to be used.
If changing the type of gas to be used, carry out the entire
appliance “COMMISSIONING” phase (page 31).
7.10 Heating power output adjustment
To comply with Building regulations, the heating output must
be set according to the requirements of the installed heating
system.
This is done by adjustment of "parameter 15" (PAR 15).
Calculate the heating requirements of the heating system in
kW. Determine what that value is, as a % of the nominal heat
output of the boiler, see table "Technical features" page 15.
Access the parameters as shown in "Parameter setting and
display" page 32, and adjust PAR 15 to that % value.
Example:
–
Heating system with 8 radiators, average 1.5 kW per radiator
total heat
–
Requirement 12 kW (8 x 1.5)
–
Maximum nominal heat output of boiler = 23.6 kW
–
PAR 15 = 12/23.6 = 50.8%. Set PAR 15 to 51%.
