STIEBEL ELTRON DHC-E 12/15-2 Plus, Руководство по эксплуатации и установке, Страница: 21 / 88

INSTALLATION
Maintenance
EN
GL
ISH
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15. Maintenance
WARNING Electrocution
Before beginning any work on the water heater, be sure
that connected circuit breakers are “Off” to avoid any
danger of electric shock.
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 all connected draw-off valves at least 5
times, for at least 3 minutes total, until all air has been
purged from the pipework and the water heater.
f
Switch the power back ON at the breaker panel.
The DHC-E has a built in sediment filter screen that should be cleaned
periodically:
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 and
closing all connected draw-off valves at least 5 times, for at
least 3 minutes total, until all air has been purged from the
pipework and the water heater.
f Turn on circuit breaker to bring electrical power to the unit.