18
221790B
6 Commissioning
Diagram 6.3
3811
ENSURE
CASE ENGAGEMENT
CASE
CONTROLS
COVER
6.3 Testing
To check the operation of the flame failure device, turn the gas
cock “Off”.
The multi-functional control should shut down within 60 seconds,
indicated by a “click” from the multi-functional control.
Turn gas cock “On” and relight the burner.
Allow the system to reach maximum working temperature and
examine for water leaks.
There should be no undue noise in the system and no pumping
over of water or entry of air at the open vent above the feed and
expansion cistern.
The boiler should then be turned off and the system drained off
as rapidly as possible, whilst still hot.
6.4 Adjustment - Fully Pumped Water System
When commissioning the system the boiler should first be fired
with the bypass fully closed on full service, that is, central
heating and domestic hot water. The system should then be
balanced, adjusting the pump and lockshield valve as necessary.
Having achieved a satisfactory condition operate the boiler with
the bypass fully closed on minimum load, normally this will be
central heating only with one radiator in the main living area
operating. The bypass valve should be gradually opened to
achieve the design temperature difference between the flow
and return.
UNDER NO CIRCUMSTANCES SHOULD THIS VALVE BE
LEFT IN THE FULLY CLOSED POSITION.
Note. Operate the boiler on full service and check the balancing,
making further adjustments as necessary.
Do not attempt to adjust the control thermostat calibration.
6.5 Thermostatic Radiator Valves
If thermostatic radiator valves are fitted care must be taken to
make sure that an adequate flow rate through the boiler when
they close, refer to the current issue of BS7478 for guidance.
6.6 Completion
Fit the controls cover by hooking into the sliders and pushing it
back as far as it will go, see diagram 6.3.
6.7 Protection Against Freezing
If the boiler is to be out of use for a period of time during severe
weather conditions we recommend that the whole of the system
including the boiler, be drained off to avoid the risk of freezing
up.
7 Instructions to the User
Instruct and demonstrate the safe and efficient operation of the
boiler, heating system and domestic hot water system.
Advise the user, that to ensure the continued efficient and safe
operation of the boiler it is recommended that it is checked and
serviced at regular intervals. The frequency of servicing will
depend upon the particular installation and usage, but in general
once a year, preferably at the end of the heating season should
be enough.
Draw attention, if applicable, to the current issue of the Gas
Safety (Installation and Use) Regulations, Section 35, which
imposes a duty of care on all persons who let out any property
containing a gas appliance.
It is the Law that servicing is carried out by a competent person.
Advise the user of the precautions necessary to prevent damage
to the system and building in the event of the heating system
being out of use during frost and freezing conditions.
Reminder, leave these instructions and the ‘Benchmark’ logbook
with the user.
Instructions to the User
