Water Temperature Not Good; Presumed Water Leakage - A.O. Smith DRE 52 Installation And User Instructions Manual

In normal operation the safety relays
are in a taut condition. When the feed
voltage is switched off these drop. This
is clearly audible. If the switching on
and off of the relay is not audible, then
check whether feed voltage is present
and the fuses of the feed are in order. If
this is in order then check (with a voltage
free device!) the following (see also 1.2
Regulation and Protection):
1. Check the fuse of the transformer in
the current circuit
2. Check whether the water level in the
device is sufficiently high (boil dry
protection).
4. Check whether the fuses of the
heating elements are in order.
5. Check whether the maximum
thermostats of the elements have
connected by pressing in the reset
buttons of all thermostats.
6. Close the door and reconnect the
feed voltage. If the safety relays do
not connect or if the device does
not function properly then engage a
repair service.
Explanation
All devices are made with a number
of maximum thermostats which break
the circuit when the water temperature
is too high (93°C). These maximum
thermostats can only be reset again
once the temperature has dropped
20°C. Then the regulating thermostat
must be examined: if this is set at too
high a temperature, the thermostat must
be set lower. If it is not set to a high
temperature it is probably defective and
in this case it must be replaced. Check
the fuses as well and replace them if
necessary. The fuses can be ordered
through A.O. Smith.
2.4.1 Water Temperature Not
Good
1. Check the settings of the regulating
thermostat.
2. Check for leaks or open valves.
3. Check the hot water temperature
right by the pipe leading out from the
device in order to be sure that a too
low water temperature is not caused
by the mixing of cold water into the
pipe system.
4. Check if the wiring has been properly
connected.
5. Check whether the voltage between
the three phases is 380-415 V.
6. Check whether the need for hot
water is greater than initially
calculated.

2.4.2 Presumed Water Leakage

1. Check whether the drain valve is
fully closed.
2. Check whether all water connections
are water tight.
19