Potterton Derwent Compact Plus Installation, Operation & Maintenance Manual page 18

SECTION 5
PAGE 16
the right damper positioning.
Hole No 1
Model
Hole Position
Low Load Control & Set-up:
The control and setting is carried out as high fire
setting. The low fire set-up is achieved by the
adjustment of the rheostat which is located at the
inner side of the front panel. Rotating the
rheostat allows the correct resistance to be
obtained as shown
Measuring the resistance is carried out by an
ohm meter connected as shown below:
Model
Resistance
Ohm
The resistance tolerance is about 5 Ohms
IMPORTANT: The
manufactured in accordance with ISO 9002. A
condition of the supply of the appliance for
compliance with this Quality Assurance plan is
the return of the appliance commissioning report.
Important – Safety
In the U.K. it is a legal requirement that when working
on gas appliances the engineer must be CORGI
registered. The manufacturer
responsible for any consequential damage, loss or
personal injury as a result of customers failing to
follow these instructions, or as a result of misuse.
Emergency Instructions
The burners are designed and constructed to meet all
of the essential requirements of the GAS APPLIANCE
DIRECTIVE 90/396/EEC
circumstances should not give occasion to any
hazardous conditions. If such a condition should occur
during commissioning or subsequent use of this
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
4 6
3 3
on the table below.
4 6
560 270 100
boiler/burner units
cannot be
and under
POTTERTON COMMERCIAL PRODUCTS DIVISION
DERWENT COMPACT PLUS - CONDENSING
product, be it a fault of the boiler or of any instrument,
machine or service in the proximity of the burner then
the GAS and ELECTRICITY supply to the burner
should be IMMEDIATELY ISOLATED until such time
that the fault has been investigated and rectified.
IMPORTANT After each adjustment, gas flow rate
and flue gas analysis should be re-checked.
ALWAYS Use approved test equipment (continually
monitoring electronic equipment is recommended).
NEVER Rely on a visual inspection of the flame as a
8
guide to combustion quality.
6
Following/during commissioning of the burner unit the
following additional checks should be carried out.
1 Operation of the control, high/low and limit
thermostats should be checked for correct
2 The flue draught available at the appliance flue
outlet should be checked under all operating
conditions (hot and cold) and should be within the
boiler operating parameters, see Table 3.
3 The fuel supply to the appliance should be
8
isolated and the burner operated to ensure safety
shut down and lockout of the burner on flame
failure.
4 Shut down of the boiler plant by external controls
does not cause a hazardous condition and pump
overrun is provided to remove residual heat from
the boiler.
5 Following commissioning the boiler overheat and
control thermostats should be set to the required
are
operating setting.
6 Following completion of commissioning the
soundness of all automatic fuel valves should be
checked for leakage.
Additional Checks
Where possible, the system should be checked to
ensure that following purging of air there is no raw
held
water make-up. In particular, when the system is
operated in the hot condition, there should be no
discharge of water from the safety valve, open vent or
cold feed tank overflow that would otherwise lead to
unregulated raw water make-up when the system
cools down.
Pre-Lighting
normal
Before attempting to light the boiler start the
circulating pump and check that it is scheduled to run