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Mizudo FDG-CS90 Manuel D'installation Et D'utilisation page 34

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Maintenance
6.4 Visual Inspection of Flame
Verify proper operation after servicing.
The burner must flame evenly over the entire
surface when operating correctly. The flame must
burn with a clear, blue, stable flame. See the parts
breakdown of the burner for the location of the
view ports. The flame pattern should be as shown
in the figures below.
SATISFACTORY
FRONT VIEW
UNSATISFACTORY
FRONT VIEW
6.5 Pressure Relief Valve Maintenance
WARNING
Testing the pressure relief valve should only
be performed by a licensed professional.
Water discharged from the pressure relief
valve could cause severe burns instantly or
death from scalds.
WARNING
Before manually operating the pressure
reducing valve, check that the hot water is
discharged in a safe place. If water cannot
escape from the end of the drain, turn off
the air supply and turn off the power and
call a qualified person to determine the
cause. See the manufacturer of the pressure
relief valve for inspection and maintenance
requirements.
34
Blue flame
flame rod
Yellow flame
flame rod
WARNING
Do not check the safety valve when the
water heater is in normal operation to avoid
hot water burns.
The dirt will directly affect the normal function of
Ÿ
the safety valve function. It requires hot water
system maintenance of anti-fouling and anti-
scaling cleaning.
The user must check the relief valve at least once
Ÿ
a year. When checking, turn off the water heater's
power supply and gas. Turn on the water inlet
switch to create pressure in the water system.
Then gently open relief valve handle until there is
water out and then gently close, if there is no
water out, indicating that the valve is invalid, this
time should immediately turn off the water heater
water switch and ask the service personnel to
deal with. Before operating the handle, check the
discharge line connecting the valve to ensure that
the water drained from the valve can be drained
to a suitable place.
* This is a concept
drawing only.
Pressure relief valve
Discharge Line
(To Suitable Drain)
6.6 Freeze Prevention
WARNING
If freezing conditions are expected, turn off
water and gas and drain all water from the
appliance. If power and the automatic frost
protection are connected freezing will be
prevented.
Ball valves

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Fdg-cs120