Hamworthy Purewell VariHeat 110c, Инструкция по установке, наладке и обслуживанию

Страница: 45 / 72

HAMWORTHY HEATING LTD
39
PUREWELL Vari
Heat c
500001169/T
9.0 FAULT FINDING
The Purewell VariHeat boiler is equipped with full self diagnostic fault indication, which is displayed on the screen
- refer to
section 8.2.1 - Controls Operation.
Should a fault occur which cannot be reset, or a fault repeatedly occurs, contact Hamworthy Heating for
assistance. Do not continue to operate or use the boiler as this may cause damage to the boiler or
controls.
9.1 Safety Features Summary
9.1.1 Safety Temperature Limiter
1 The electronic control thermostat has several safety levels built in such that a controlled shutdown should occur
before the limit thermostat is activated. Should these safety levels be overridden (say external pump overrun
failure after shutdown) the temperature limit thermostat will trip initiating a boiler shutdown, preventing the boiler
from firing.
Should the control thermostat fail, causing an overheat condition, the safety temperature limiter will trip thus creating an
immediate shutdown regardless of firing mode. An overheat message on the
controls fascia
will indicate that this
condition has occurred. The limiter thermostat is reset by depressing the reset pin protruding through the hole in the
centre of the controls fascia. If, after pushing the pin in, the display screen does not reset and the boiler does not light up,
it could be that the boiler is still too hot, i.e. the control thermostat has not re-set. An investigation should be carried out to
ascertain the reason for the overheating. An obvious reason would be too low a water flow rate through the boiler.
9.1.2 Flame Probe
The flame is under constant supervision by the burner logic controller through use of a flame probe. This is accomplished
by measuring the flame's ability to rectify an AC current. If the flame diminishes for whatever reason and the rectified
current drops below the controllers minimum (3µA DC), the controller will induce a non-volatile lockout which will require a
manual re-set (‘on/off button situated on the controls fascia) to re-start the control sequence. .
9.2 Fault Finding Procedures
General error messages are detailed in section 8 to assist with fault finding. If the boiler still cannot be operated
satisfactorily after following the instructions, consult your Hamworthy Heating for assistance.
9.3 Possible Causes of Boiler Lockout
1) Ignition failure due to faulty igniter.
2) Ignition failure due to faulty gas valve.
3) Ignition failure due to No or low gas supply pressure.
4) No ignition due to faulty controller.
5) Ignition failure due to faulty flame probe or sensing circuit.
6) High temperature
7) Unnecessary pressing of reset when boiler is running
Should a fault code appear which cannot be reset, or a fault code repeatedly occurs,
contact Hamworthy Heating for assistance. Do not continue to operate or use the boiler
as this may cause damage to the controls.
10.0 SERVICING
A competent person registered for working on non domestic gas appliances should check and ensure that the
flue, its support and terminal, the ventilation to the boiler house, safety valve, condensate trap, drain, water
filter if fitted, pressure gauge etc., are in a serviceable and working condition, and still comply with the
relevant standards and codes of practice - see Section 4 & Appendices
10.1 Regular servicing is recommended
, preferably by a Hamworthy appointed person, and at least annually,
to ensure trouble free operation.
For the Purewell Vari
Heat
, Hamworthy would recommend an additional 6 monthly examination following
commissioning, acknowledging site conditions and running hours.
Although cleaning of flueways may not be necessary on a yearly basis inspection of the flueways must be undertaken
annually and it is important that all controls and safety features are checked for correct operation.
NOTE!
Measuring flue gas CO
2
and gas temperatures will give an indication of the state of the boiler flueways and
waterways. Results should be compared with previously measured values to establish possible loss of efficiency.
Should remedial work be carried out on a boiler within a bank of boilers, then the non-firing module must be