OpEraTiON
maintenance
16
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15. Maintenance
WARNING
Electrocution
Before performing any work on the appliance, discon-
nect all poles from the power supply.
15.1 Draining the water heater
The water heater can be drained for maintenance work.
WARNING
Burns
Hot water may escape when you drain the water heater.
f
Close the shut-off valve in the cold water inlet line.
f
Open all draw-off valves.
f
Undo the water connections on the water heater.
f
Store the dismantled water heater free from the risk of frost,
as water residues remaining inside the water heater can
freeze and cause damage.
15.2 Cleaning the filter screen
WARNING
Burns
Hot water may escape when you drain the water heater.
!
Material losses
To ensure that the Direct Coil
™
heating system is not dam-
aged following an interruption to the water supply, the
water heater must be restarted by taking the following
steps:
f
Shut off power to the unit at the breaker panel by
making sure that connected circuit breakers are
“OFF” to avoid any danger of electric shock.
f
Open and close the tap at least five times for three
minutes total, until the water heater and its up-
stream cold water inlet line are free of air.
f
Switch the power back ON at the breaker panel.
The DCE has a built in sediment filter screen that should be cleaned
periodically.
15.2.1 Cleaning the filter screen, standard non-concealed
installation
f
Turn off power to the water heater at the circuit breaker.
f
Turn off the water supply to the water heater at the shut-off
valve.
f
Open a connected hot water tap to relieve built-up pressure
(this will minimize leakage when removing the connection
from the cold water inlet).
f
Disconnect the braided steel flex connector from the cold
water inlet fitting (right).
f
To remove the filter screen from the bottom of the cold water
inlet, carefully insert a flathead screwdriver just above the
plastic lip of the filter screen, and gently pull downward.
f
Clean the filter screen, re-insert securely into the cold water
inlet fitting, and reconnect the braid steel flex connector to
the cold water inlet.
f
Open the cold water supply shut-off valve.
f
Vent the air from pipes and the water heater by opening the
hot water faucet for a few minutes, until water flow is contin-
uous and all air is purged from the water pipes.
f
Turn on circuit breaker to bring electrical power to the unit.
15.2.2 Cleaning the filter screen, concealed installation
f
Turn off power to the water heater at the circuit breaker.
f
Turn off the water supply to the water heater at the shut-off
valve.
f
Open a connected hot water tap to relieve built-up pressure
(this will minimize leakage when removing the connection
from the cold water inlet).
f
Open the water heater by loosening the screw and lifting the
cover up from the bottom.
f
Unscrew the G3/8˝-union-nut from the cold water pipe
elbow.
f
Clean the filter screen, located between inlet-line and twin
connector. (compare to picture in chapter concealed installa-
tion, water connections)
f
Secure the cold water inlet line with the sealed-edge filter
screen.
f
Open the cold water supply shut-off valve.
f
Vent the air from pipes and the water heater by opening the
hot water faucet for a few minutes, until water flow is contin-
uous and all air is purged from the water pipes.
f
Ensure there are no water leaks.
f
Hook the cover into the water heater rear cover at the top
rear. Pivot the cover downwards. Check that the cover is se-
curely seated at both top and bottom. Secure the cover with
the screw.
f
Turn on circuit breaker to bring electrical power to the unit.
