Troubleshooting; Cascade Connection; Connection In A Direct Cascade; I/O Assignment - Riello STEEL PRO POWER Installation, Technical Assistance Service And System Management Manual

COMMISSIONING AND MAINTENANCE

3.13 Troubleshooting

FAULT
There is a smell of gas
Odour of unburnt gas
Irregular combustion Clean the burner and exchanger
Exchanger passages obstructed
Ignition delays with pulsations to the
burner
The modular system becomes dirty very
quickly
The burner does not start upon consent
of the modular system control
No electric power supply (no message on
The modular system does not start
The modular system does not arrive at
Burner capacity insufficient
temperature
Modular system adjustment
The generator triggers a thermal safety
block
Modular system adjustment
Presence of air in the system
The generator is at temperature but the
heating system is cold
Pump malfunctioning
The circulator does not start Pump malfunctioning
Frequent tripping of the system safety
valve
Frequent tripping of the system safety
Incorrect circuit pressure
valve
Frequent tripping of the system safety
valve
CAUSE SOLUTION
− Check the seal of the gaskets and the
Gas supply circuit
closure of the pressure tapping points
− Check the gasket seals
Flue gas circuit − Make sure there are no obstructions
− Check the combustion quality
Burner gas pressure − Check the setting
Diaphragm installed − Check the diameter
− Check the conditions
− Check passage cleaning
Faulty fan − Check operation
Burner gas pressure − Check the setting
Ignition electrode − Check the positioning and conditions
Combustion − Check the combustion controls
− Check for the presence of 230Vac volt-
Gas valve age on the gas valve terminals, check
wiring and connections
− Check the electric connections
the display) − Check the condition of the fuse
Boiler dirty − Clean the combustion chamber
− Check and adjust the burner
− Check correct functioning
− Check the temperature setting
− Check correct functioning
− Check the temperature setting
No water
− Check the electrical wiring
− Check the position of the sensor bulbs
− Check the bleed valve
− Check the heating circuit pressure
− Bleed the system
− Check/unseize the pump
− Replace the circulator
− Check the electrical connection of the
circulator
− Check/unseize the pump
− Replace the circulator
− Check the electrical connection of the
circulator
System safety valve − Check calibration or efficiency
− Check the circuit pressure
− Check pressure reducer functioning
− Check the efficiency of the expansion
CH expansion vessel
vessel
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4 CASCADE CONNECTION

The models Steel Pro Power 270-2 P/V, 405-3 P/V and 540-4 P/V can be connected together to build a modular and modulating
cascading system with a maximum of 10 heating elements, with maximum installed power of 1310 kW. There are two ways of con-
necting up a cascading system, illustrated in the following chapters.
4.1

Connection in a direct cascade

This configuration is feasible for up to 8 modules. This means that the whole cascade can be managed from the interface on one of
the two thermal modules (chosen as the managing unit for the system).
Thermal module 1
M D D D
1 2
The thermal modules are standard set with a MANAGING element (M) and a DEPENDING (D) element.
To be able to connect the modules in cascade it is necessary to carry out the operations described in the following paragraph.
Before proceeding to connect the cascade bus, the following preliminary operations must be carried out:
− Assignment of the correct I/O on the "MANAGING" board (D4 and D8) of each "DEPENDING" thermal module;
− Setting of the dip-switches on each board of the thermal elements of each "DEPENDING" thermal module (thermal module
2 and 3).
Thermal module 1
M D D D
1 2 3
4.1.1

I/O assignment

9
Perform this operation only on the cascade-connected thermal modules such as "DEPENDING".
This operation is intended to modify the I/O management on the "MANAGING" tab of each of the thermal modules connected as
"DEPENDING".
Modify the par. 97 in this way:
− give power to the only thermal module on which the I/O assignment needs to be carried out;
− enter into "Settings", "Device Configuration", "MANAGING" and assign to par. 97 the value 16 (pump versions) or 17 (valve
versions);
− remove the power supply to the module;
− repeat this operation for all the "DEPENDING" thermal modules of the cascade.
Thermal module 2 Thermal module 3
M D M D
3 1 1
Thermal module 2 Thermal module 3
D D D D
4 5 6 7
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CASCADE CONNECTION