SECTION 5 •
OPERATING INSTRUCTIONS
38
TEMPERATURE ADJUSTMENT
During the winter season or any cold period, you may
desire a higher temperature setting to adjust for the cold
incoming water. This adjustment, however, may cause
additional condensation to form on the colder tank
surface. This does not mean the tank is leaking. During
summer months, the warmer incoming water
temperatures will benefit the performance of your water
heater and reduce the amount of condensation
developed.
Condensation does not mean your tank is leaking. Most
of reported tank leaks on installation’s are proven to be
condensation. To avoid unnecessary inconvenience and
expense, make sure the tank is actually leaking before
contacting Andrews Water Heaters.
BURNER FLAME CHECK
If the water heater is to remain idle for 30 days or more, or
is subjected to freezing temperatures while shut off, the
water heater and piping should be fully drained and the
drain valve should be left fully open. Refer to the relevant
section of the Installation and Operating Instructions
Manual for the procedure on draining the water heater.
When properly installed and adjusted, the heater will
require minimal attention. Should it become necessary to
completely drain the heater, follow instructions given in
Section 4, Commissioning.
ECO (ENERGY CUT-OFF)
The heater is equipped with an ECO (Energy Cut-Off)
device, fitted to the control thermostat. It is a temperature
sensitive switch which opens at high temperature,
shutting off gas to the burner in an overheat condition.
When the water has cooled sufficiently, the manual reset
on the ECO needs to be depressed to allow the heater to
be re-lit. If the burner shuts down and is associated with
high water temperature, the ECO is probably operational
and the cause of overheating should be investigated.
TEMPERATURE STRATIFICATION
(STACKING)
When small amounts of hot water are drawn repeatedly,
the thermostat responds to each feed of cold water and
activates the main burners. Each time this occurs, more
heat may be put back in the tank than was drawn off. As
this continues, water in the upper level of the tank gets
hotter than the thermostat setting. The hotter water does
not mix completely with the cold inlet water, but rises in a
‘chimney effect’ to the top of the tank. Many repetitions of
this over a short time results in accumulation of
excessively hot water in the upper part of the tank, even
when the thermostat control is within limits. This is known
as stacking.
To counter this condition, an upper thermostat phial is
fitted which senses abnormally hot water and shuts down
the main burner until the water cools. Most modern
commercial pipe installations include a pumped
secondary return system which keeps hot water moving
continuously throughout the heater. This stabilises
temperatures in the water heater tank and throughout the
pipe system.
CAUTION
This water heater is equipped with an energy cut
out device to prevent overheating. Should
overheating occur or if the gas supply fails to shut
off, turn off the manual gas control valve to the
appliance and call a qualified service company.
Fig. 16
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