 |
| |
| The
following inspection should be made: |
| |
- Check
the circuit breaker at the distribution board is switched
on and that the isolator at the electric water heater is
switched on.
- Check
switching times of the ripple relay; as this may have caused
the electric water heater to have been switched off.
- Check
the house may have a load shedder and the electric water
heater may have been switched off by the shedder.
|
| If
the above are all in order, either the thermostat or element
is faulty and should be attended to by a qualified electrician. |
| |
|
 |
| |
- Check
the size of the electric water heater and the number of
outlets which are being fed by the electric water heater,
bearing in mind that a 1700mm bath, when filled to the overflow,
holds 195 litres of water.
- Check
the thermostat setting and increase by 5 degrees Celsius
until satisfactory temperature is reached.
- Where
a shower is utilised, the average showering time of each
user, bearing in mind that the average shower rose can deliver
between 15 litres and 20 litres per minute.
- refer
to the below table to determine the amount of water used
per bath.
|
| DEPTH
mm |
HOT
70 Degrees C litre |
COLD
15 Degrees C litre |
TOTAL
VOL: 41 Degrees C litre |
| 250 |
92 |
103 |
195 |
| 200 |
73 |
82 |
155 |
| 150 |
54 |
61 |
115 |
| 100 |
38 |
42 |
80 |
|
| |
|
 |
| |
| Check
that there is water supply to the electric water heater. All
modern water heaters operate on a push through system, i.e.
water can only be drawn off if cold water is introduced to it.
|
| |
|
 |
| |
| Exactly
where overflow is released from: |
| |
- the
over temperature safety valve which will release water if
the system is over-pressurized or the temperature of the
water exceeds 94 degrees Celsius.
- expansion
relief valve which will discharge cold water from time to
time.
|
| |
| The
SABS colour codings are as follows: |
| |
Yellow
= open vent cistern tank type, i.e. no pressure
Blue = 100kPa closed system
Black = 200kPa closed system
Red = 400kPa closed system
Green = 600kPa closed system
Brown = 300kPa closed system |
| |
If
water drips from the expansion relief, try and determine the
volume of water. Water expands when heated and the volume of
expanded water is directly proportional to the size of the geyser
and the thermostat setting. Expansion can vary approximately
5% of the volume of the geyser per day. If the volume expanding
exceeds this, establish whether the house has balanced pressure.
The term "balanced" refers to the cold water take
off after the pressure reducing valve. In an unbalanced system
where common tap mixers or appliances are using hot and cold
water simultaneously, cold water may tend to force the hot water
back into the line which in turn will over pressurise the electric
water heater and cause the expansion relief to flow.
The combined expansion relief pressure reducing valve can be
serviced with replacement parts in the event of excessive release
of water. The separate expansion pressure reducing systems are
not generally serviced with replacement parts. Once again the
expansion relief overflow and the safety valve outlet must be
piped to the outside by means of metallic pipes, and insulated
where freezing can occur. |
| |
|
 |
| |
| Check
: |
| |
- that
all plumbing connections are secure.
- that
the safety valve is piped to the exterior.
|
| |
|
 |
| |
| A
Geyser tray must be installed with every hot water installation
in compliance with SABS 0254. |
| |
|
 |
| |
- A
high pressure electric water heater may be operated at any
pressure below its operation pressure, i.e. may be fed off
a headertank for rural applications.
- Please
read all literature supplied with the electric water heater
and store booklet in a safe place for future reference.
- Always
keep your proof of purchase which serves as your Warranty
Certificate to assist us should you need to contact us.
|
| |
| In
the event of the electric water heater having to be drained,
proceed as follows: |
| |
- Switch
electrical supply off.
- Switch
water supply off.
- Release
pressure which may still be contained in the electric water
heater by opening a hot water tap.
- Connect
a 3/4" hosepipe to the draincock connection provided.
- Loosen
hot water outlet pipe so that air can be introduced into
the electric water heater.
- Open
draincock and allow electric water heater to drain to the
exterior.
|
|
