joule Thermalstore 1.0, Installation Manual

Page: 52 / 68

Thermalstore
52
TESTING
If there is no heat source active, and if there is no hot water you can carry out
several tests with your multimeter to decide which component is faulty. First
remove the cover for the wiring and then check for voltage across the live and
neutral terminals on the element. If you get a reading the element is faulty (power
going through thermostat so stat is working).
Next, check whether the thermostat is working by connecting your multimeter to
the live out of the thermostat, if there is no reading the thermostat is faulty.
NOTE: IF THE WATER IS GETTING EXTREMELY HOT THEN THE THERMOSTAT IS STUCK
IN THE “ON” POSITION AND WILL NEED TO BE REPLACED.
SAFETY
Disconnect the immersion from the mains electrical supply before removing any
covers. Do not attempt to replace the immersion heater(s) with alternatives to those
recommended by JOULE.Do not bypass the Thermal Cut-Out(s) in any
circumstances.
REPLACING THE IMMERSION
First task is to isolate the power. Immersion heaters are rated at 3kW and require
their own 20amp double pole isolation switch. Turn off the power from the isolation
switch and remove the fuse. Next turn off the water to the tank. Drain the water
from the tank via the drain cock using a hose. Remove the immersion using an
immersion spanner. Thread in the replacement immersion heater creating the seal
using a rubber o
-ring or fi bre washer. Slot the immersion heater into the hole with
the washer and make sure the threads are lined up correctly. Tighten with which-
ever spanner you are using, taking care not to over tighten and risk damaging the
cylinder.
Open the taps up and turn the cold water supply back on. When water starts to
come out of the taps shut them off and check for leaks. If all is good wire up the
immersion heater, checking that your connections are good. Fit the cap on the
immersion and turn the power back on.
If the immersion is connected to a booster switch turn it on and check that it heats
up. Economy 7 immersion heaters will only turn on at set times during the night
and cannot be altered so check the following morning to see if the water has heat-
ed up properly.