Maintenance Requirements - Vaillant GA100CS SERIES Installation And Service Manual

Safety Check of Controls
After boiler has been hooked up and
is ready for operation, a few simple
checks should be made to be sure
all controls are functioning properly.
1. Thermostat--Turn thermostat to
highest setting. This should turn
on the main burner. Adjust heat
anticipator to proper current draw.
2. Thermocouple--The pilot lights
the main burner on demand and
provides a safety feature through
either a single couple thermocou-
pie or multiple couple thermocou-
pie which is placed in the pilot
flame. These thermocouples gen-
erate a small amount of electricity
which permits the valve to open
only when the pilot is burning. To
check the thermocouple for safe
operation, ignite the main burner,
then disconnect the thermocouple
lead. The main burner should
shut off.
3. Limit--The limit turns off the
burner when the boiler water tem-
perature reaches the temperature
setting of the limit. To check this,
set the limit at a lowest setting
and let the burner run until the
limit turns it off. Raise tempera-
ture setting of limit. This should
turn on burner.
Relief Valve
You have a safety relief valve on
your boiler. It will automatically open
at 30 psig pressure. This will relieve
the strain on the boiler and system.
Run a pipe from the relief valve out-
let (pipe must be same size as out-
let and open end must not be
threaded) to an open drain, tub or
sink, or other suitable drainage point
not subject to freezing. Failure to do
so may cause water ci_mage or
injury should Relief Valve release.
Main Burner
The main burner flame can be
observed through the inspection
door (Fig. 7). The flame should be
translucent and blue in color. The
presence of any yellow streaking
would indicate the presence of dust
or lack of primary air. A vacuum
cleaning of the burner tray and com-
bustion area is indicated.
DOOR _
Fkj.7
Checks for Electronic Ignition
The probe lead connections to
sensing probe and control terminal
must be secure. Electrodes should
have a spark gap of '/a". If the pilot
burner does not ignite, check to see
that all connections are proper.
Observe presence of spark. If spark
is not present, determine if power is
available to the control. The ignition
control should be replaced if, with
power applied and spark gap prop-
erly set at _", sparking does not
occur. If pilot gas does not light
even though a spark is present, gas
is not available at the pilot burner or
the gas pressure is too low or high.
If pilot ignites, but burner does not,
check probe lead connections to the
sensing probe and control. Do not
attempt to field repair the control.
Replace defective controls.
12. Maintenance
Requirements
CLEANING MUST INCLUDE PERI-
ODIC EXAMINATION OF VENTING
SYSTEMS. ALL FLUE GAS PAS-
SAGEWAYS FROM BOILER TO
CHIMNEY AND THE CHIMNEY
ITSELF SHOULD BE INSPECTED
AND CLEANED IF NECESSARY.
THIS SHOULD BE PERFORMED
AT LEAST ONCE A YEAR, PRIOR
TO THE STARTING OF THE
HEATING SEASON.
1. Brush entire surface of all flues
using a long handled wire brush.
Remove all soot, rust and scale
found. Inspect with a flashlight to
see that all flueways are com-
pletely open. Remove soot and
dirt from bottom of boiler.
2. Inspect the flue cover, draft
diverter, and smokepipe and
replace unserviceable parts,
clean all soot, rust or scale from
these parts and from chimney.
Clean the burners; use a soap
solution if necessary.
CAUTION: If it becomes necessary
to remove the draft diverter, it must
be rasealed to the casting using
new sealant to be sure no fumes
can escape.
3. Reassemble all parts and start
the boiler following the installation
instructions. Carefully inspect fire
above each burner for a stable
and blue flame. Carbon monoxide
poisoning can be caused by yel-
lowish unstable (wavy) flame.
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