Start Up/Test; Maintenance; Replacing Thermostat - Isotemp Basic Manual De Operación

5. Start up/test

Fill the hot water tank by turning on the water pressure
pump and opening a hot water tap to allow air to bleed
out of the hoses and / or plumbing.
Check the drain and pressure relief valve by pushing
the lever. Water will ! ow into the drain hose. Make sure
the drain hose is not blocked or closed. Pull the lever
back to closed position.

6. Maintenance

6:1 Winter drain: When there is a risk of freezing the
tank must be drained.
This is done by taking off the hot water hose or opening the air
bleeder screw mounted on the mixing valve, if such a valve is
mounted. Take the air screw away completely, and open the drain
valve by turning the black knob anticlockwise one snap on the
safety valve. The valve is closed again by tuning further one step
anticlockwise.
If the engine is raw-water cooled the heat exchanger must also be
drained by removing the hoses and blowing air into the coils to
drain any water. The tank can now be safely left in the vessel over
the winter. When leaving the vessel for longer periods, it is
recommended to take out the power cord to eliminate the risk of
stray current from the shore power earth connections.
6:2 Replacing / re-setting thermostat:
Warning: Be sure to turn power off ! rst"
The immersion heater is 230V-750W. The thermostat equipment
has an integrated working thermostat and a double overheat
protection thermostat. This is manually re-settable, by pushing the
pin on the top of the thermostat.
(See " g. 10). Also check why the overheat thermostat initially
tripped before re-connection the power supply.
Turn off the power# Pull out the cable plug. Take off the front
plastic cover (Basic and Slim 4 screws, Square 3 screws).
Reset overheat thermostat.
Replacing thermostats: Pull off the cable shoes after having
noticed their positions. Thermostat sensor ends are put into
a tube on the heater element fastening ! ange. Pull them out.
Unscrew fastening screws for the thermostats. Mount
new thermostats in opposite order. Be sure sensor ends are
properly put into the tube.
When leaving the boat for longer periods, it is recommended
to disconnect the power supply cable plug. This should be done
even if the shore power system is shut off, as there can be a
difference in the electrical system, between the earth lead and
the salt water earth of the boat. This can seriously damage the
water heater and/or engine with propulsion equipment.
8
Start the engine to check the circulation of the coolant.
It will be necessary to add coolant to the system to
compensate for the additional volume of the exchanger
and hoses. Check for air locks in the connecting hoses
and raise and lower these as necessary to clear the air
from the hoses before securing the hoses in place.
Lastly plug in the tank and turn on the circuit breaker.
Check for proper operation.
Fig. 9
Fig. 10
Air bleeder
screw
Basic
Slim
Slim Square