AVOID STEAM
AVOID STEAM
CONTACT
CONTACT
OM/SM-AH-CE
8
Section 3
Servicing and Conversion
IMPORTANT
BEFORE ATTEMPTING ANY SERVICING, ENSURE THAT THE ISOLATING COCK IS TURNED OFF
AND CANNOT BE INADVERTENTLY TURNED ON, AND THAT THE ELECTRICITY SUPPLY IS
DISCONNECTED.
AFTER ANY MAINTENANCE TASK, CHECK THE APPLIANCE TO ENSURE THAT IT PERFORMS
CORRECTLY AND CARRY OUT ANY NECESSARY ADJUSTMENTS AS DETAILED IN SECTION 1.
ALWAYS CHECK FOR GAS SOUNDNESS
AFTER CARRYING OUT ANY SERVICING OR
EXCHANGE OF GAS CARRYING COMPONENTS !
NOTE
:
When replacing wiring connections refer to the wiring diagram on the unit and in this manual.
After Servicing
a) Test for gas soundness as specified in
IGE/UP1 as appropriate after any gas
connection has been disturbed.
b) Check for correct operation, as appropriate
(see commissioning of appliance).
Regular Servicing Procedures
The following must be serviced at regular
intervals.
To achieve topmost performance and maximum
Burners
The burner should be cleaned periodically to
maintain maximum performance. The burner is
best cleaned with a wire brush, taking care not
to damage the burner head.
The injector orifice should be cleaned with a
wooden splinter. Metal reamers may distort or
increase the orifice size and should be avoided.
Safety Valve
At least once every two months the safety valve
must be checked. When the gauge pressure is
about five PSIG, lift the valve enough to vent
steam, then quickly let it snap back into place.
WARNING
AVOID ANY EXPOSURE TO THE STEAM
BLOWING OUT OF THE SAFETY VALVE.
This procedure should be explained to the user,
as it is to be carried out at least twice a month.
Safety procedures and requirements should also
be explained to the user when carrying out the
procedure.
Safety Valve Operating Instructions
If adding water to a boiler,
DO NOT ALLOW
water to flow through safety valve as sediment
or debris may be deposited on seating surface.
service life, it is necessary to maintain a proper
pressure margin between set pressure of the
safety valve and equipment operating pressure.
The minimum required pressure margin for this
type of valve is 10% of the safety relief valve
set pressure, but not less than five Pounds per
Square Inch, Gauge (PSIG).
UNDER NO
CIRCUMSTANCES SHOULD THIS MARGIN
BE LESS THAN FIVE PSIG.!
Failure to
maintain this margin may result in water leakage
past the seat and an accumulation of deposits
on the seating surface. Excessive deposits may
prevent the valve from operating properly, and a
dangerous pressure build-up and equipment
rupture may result.
Maintenance and Testing
CAUTION!
Before testing, make certain
discharge pipe is properly connected to valve
outlet and arranged to contain and safely
dispose of boiler discharge (see “Installation
Instructions”).
Under normal operating conditions a “try lever
test” must be performed every two months.
Under severe service conditions, or if corrosion
and/or deposits are noticed within the valve
Summary of Contents for GROEN AH-20
Page 23: ...OM SM AH CE 23 ...
Page 24: ...OM SM AH CE 24 Parts Lists ...