Table of Contents
Advertisement
If using a sand filter: Check the pressure indicator on your sand filter and
back wash if necessary.
Note: In some cases the 'Thermal safety cut-out' tripping and a low
flow rate can be linked ie: when a filter becomes choked air can be
drawn into the filtration system and become trapped inside the
heater so causing the thermal cut-out to trip.
Quick Function Test
Observe the main electricity meter when the heater is on (ie: red light 'On')
and then observe it again when the red light is off. The test should show
that the meter is recording more electricity being used by the heater when
the red light is 'On'.
It is impossible for an electric heater to waste energy, if it is drawing power
then that power will be turned into heat that will be transferred to the
water.
Accurate Function Test
If a more accurate test is required to confirm that your heater is delivering
the specified heat output, two electricity meter readings will need to be
taken from the properties main electricity meter, with an exact one hour
interval (ie: take one meter reading and then a second reading exactly one
hour later) then by subtracting the first reading from the second
reading the number of units (kilo watts kW) consumed can be calculated.
Note that your heater is also rated in kW hours. The spa pump and heater
will need to be running continuously during the test (ie: with the heater
red light 'On') To avoid inaccurate results when performing this test, it is
important to refrain from using other high current consuming appliances
in the property (such as tumble dryer, showers, cookers etc).
A large domestic spa pump of 1 horsepower will draw less than 1-kW in a
one hour period. The conclusion of the test should prove that for example
a 6-kW heater and a ½ horsepower pump will draw between 6.3-kW ~
6.5-kW in one hour. It is impossible for an electric heater to waste energy,
if it is drawing power then that power will be turned into heat that will be
transferred to the water.
www.elecro.co.uk
7
Advertisement
Table of Contents
