Riello TAU Unit 50 Installation And Maintenance Manual page 35

Nr. dis-
Par.
Menu played
No.
Display
DHW Tank Defines the hysteresis to stop the domestic hot
M1 37
Hyst. Up water demand.
Defines the primary circuit's set-point increase in
DHW Tank
M1 38 degrees compared to the temperature set for the
Supply Extra
domestic hot water tank.
DHW Tank Defines the primary circuit's restart hysteresis in
M1 39 Supp Hyst modes 1 and 2 of domestic hot water (valid both for
Dn cascade and stand-alone applications).
DHW Tank Defines the primary circuit's shut-off hysteresis in
M1 40 Supp Hyst modes 1 and 2 of domestic hot water (valid both for
Up cascade and stand-alone applications).
Defines the value of a storage cylinder's delta T re-
quired for temperature maintenance. For instance,
if set at 3 degrees, when the storage cylinder is at
a set-point value minus 3 degrees, the boiler is
DHW Tank switched on at minimum power to maintain the
M1 41
Hold Warm temperature to the set-point plus hysteresis. If this
parameter is kept the same as Par. 36, this function
is inactive and the boiler is switched on at the
maximum power envisaged for the domestic hot
water's circuit.
Defines the priority type:
0 = Time: time priority between the two circuits
defined by Par. 43;
1 = Off: priority for CH;
M1 42 DHW Priority
2 = On: priority for DHW;
3 = Parallel: parallel priority managed on the basis
of the primary circuit's temperature compared to
the heating circuit's set-point.
DHW stor-
Defines the Accumulation sanitary Setpoint in
M1 115 age tank
mode 1
setp.
DHW Max. Establishes the time in minutes during which
M1 43 Priority priority is alternatively allocated to the DHW and CH
Time circuits when Par. 43 is set to "time" mode.
Establishes the overrun time in seconds for the
domestic hot water mode with the boiler in stand-
DHW Pump
M1 44 alone operation; cascaded operation defines the
Overrun
module's overrun after switch-off due to ther-
moregulation.
DHW Tank Defines the proportional term for modulation dur-
M1 45
PID P ing operation of the DHW storage tank.
DHW Tank Defines the integral term for modulation during
M1 46
PID I operation of the DHW storage tank.
DHW Tank Defines the derivative term for modulation during
M1 47
PID D operation of the DHW storage tank.
DHW tank Establishes the DHW storage tank set-point Par. 35
M1 48
set-point in mode 2.
Fan Speed Defines the number of fan rpm at max. power (it
M1 92
Maximum depends on the model and is defined at Par. 98).
Defines the number of fan rpm at minimum power
Fan Speed
M1 93 (it depends on the model and is defined at Par.
Minimum
98).
Defines the number of fan rpm when the boiler
Fan Speed
M1 94 is switched on (it depends on the model and is
Ignition
defined at Par. 98).
The value of this parameter is defined by Par. 97.
Prog. Input 0 = Disabled
M1 116
1. 1 = Minimum water pressure switch
3 = Flue gas pressure switch
The value of this parameter is defined by Par. 97.
0 = Disabled
Prog Input 1 = DHW flowmeter
M1 117
2. 2 = DHW flow switch
3 = Heating flowmeter
4 = Heating flow switch
Description
35
Default set-
Range
ting
0...20 5
0...30 15
0...20 5
0...20 5
0...10 5
0...3 2
40...71 57
1...255 30 Min.
0...900 60
0...1255 100
0...1255 500
0...1255 0
40...71 50
Defined by
0...12750 RPM
Par. 98
Defined by
0...12750 RPM
Par. 98
Defined by
0...12750 RPM
Par. 98
0,1,3 0
0...4 0
INSTALLATION
Access
UM Category
type
°C I DHW
°C I DHW
°C O DHW
°C O DHW
°C O DHW
I DHW
°C U DHW
I DHW
Sec. I DHW
O DHW
O DHW
O DHW
°C U DHW
I General
I General
I General
I General
I General