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UNIT DESCRIPTION
2.1
General
The Daikin EHOB**A*V1H wall-mounted gas boiler is a closed unit. The unit is intended
to provide heat to the water of a CH-installation and the domestic hot water installation.
The air supply and combustible gas outlet can be connected to the unit by means of
two separate pipes. A concentric connection can be supplied upon demand. The unit
was tested in combination with the combi feedthrough, but the unit may also be
connected to combi feedthroughs which meet the universal test standards for combi
feedthroughs.
The unit can be connected to an assembly bracket if required, a frame with top
connection, and various installation sets. These are provided separately.
The Daikin EHOB**A*V1H wall-mounted gas boilers have the CE marking, electrical
protection class IPX4D
The unit is delivered for natural gas (G20) as a standard. On request, the unit can also
be provided for propane (G31).
2.2
Functioning
The Daikin EHOB**A*V1H wall-mounted gas boiler is a modulating high-efficiency
boiler. This means that the power is modulated to suit the required heat demand.
A copper CH circuit is integrated in the aluminum heat exchanger.
The water of the DHW installation can be heated by connecting the unit to an indirectly
heated tank using a three-way valve and tank sensor (see par.5.1 and 5.2). The built in
tank regulation of the unit ensures the domestic hot water provision takes precedence
over the heating. Both cannot work at the same time.
The unit is fitted with an electronic boiler controller, which operates the fan at every
heat requirement of the heating or the warm water supply, opens the gas valve, ignites
the boiler controller, and continuously monitors and regulates the flame, depending on
the requested power.
2.3
Operating modes
The operating mode of the unit is indicated by means of a code on the service display
of the operating panel.
-
Off
The unit is not in operation, but is connected to the electricity supply. No response is
given to requests for domestic hot water or CH water. The unit frost protection is active.
This means that the pump will start running and the exchanger will be heated up if the
temperature of the water in the system drops too far.
If the frost protection intervenes, the code
The pressure in the CH installation can also be read from the temperature display in
this operating mode (in bar).
Standby
The LED at the
key is lit and possibly one of the LEDs of the tap comfort function.
The unit is ready to respond to a request for CH or tap water.
0
Post-running CH
After the end of the CH-operation, the pump will run for a specified time. The post-
pumping time is set to the value in par. 7.2 in its factory settings. This setting can be
changed. In addition to this, the pump will run automatically 1 time per 24 hours, for 10
seconds, in order to prevent it from getting stuck. This automatic switching on of the
pump takes place at the time of the last heating request. In order to change this, the
room thermostat needs to be set higher for a moment, at the required time of day.
1
Requested temperature reached
The boiler controller may temporarily block the heat request. The boiler controller will
then be stopped. The block occurs because the required temperature has been
reached. When the temperature has sufficiently decreased, the block will be lifted.
2
Selftest
Once every 24 hours, the boiler controller tests the connected sensors. During the test,
the relay will not carry out any other tasks.
Daikin Europe NV
7
will be displayed (heating up exchanger).
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