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19.0 STARTING THE WATER HEATER
19.1
GENERAL
The gas input pressure for the water heater to operate properly under the correct load, must be at high fire more or equal to the minimum
gas inlet pressure for the supplied gas type, as stated in the technical specification data table on page 5.
* Gas valve screws and nipples: see picture on page 76.
The water heater has two identical gas control valves: the top burner (MASTER) and the bottom burner (SLAVE 1). Both gas valves must be
adjusted at maximum load and at minimum load.
Two burners are present in one heat exchanger. In fact, into one stainless steel casing, two heat exchangers have been built, a primary and a
secondary. The primary exchanger, moreover, consists of an upper and a lower part. The upper part in which the top burner fires, is only
transferring heat from the top burner. The lower part in which the bottom burner fires, is only transferring heat from the bottom burner. After
the flue gases have passed the primary heat exchanger, they merge in the central part. In this secondary part the remaining heat is extracted
from the flue gases of both burners, causing condensation of the gases, if cooled down sufficiently,
Measuring the CO
percentage in the flue gas outlet outside the water heater, while both burners are burning, will result in an average CO
2
value. It is possible that this average value is correct, while the CO
is too high. Therefore the CO
two measuring holes. See drawing.
Top (primary) heat exchanger
Plug for top measuring hole
Top measuring hole for
(Secondary heat exchanger)
Bottom measuring hole for
Plug for bottom measuring hole
Bottom (primary) heat exchanger
levels of each burner must be adjusted separately. Measurements are performed at the front, by making use of
2
Top burner
flue gas measuring
flue gas measuring
Bottom burner
setting of the top burner is too low and the CO
2
setting of the bottom burner
2
2
89
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