English 35
4.2.10 Factory setting function
4.2.10.1 Tickle the factory setting under the key
When in power off state, if “MODE” key and “POWER” key are pressed for 3s simultaneously, the
display screen will be fully bright and system will enter into the factory setting mode (buzzer will ring, if
any). Then the system will enter into “heating/heat preservation” state after 2s. The factory setting
parameters are shown in the following table.
Basic Parameters of Factory Setting System
Factory setting parameter
600W(Heating at full speed)
4.3 Alarming function and fault self-detection (not available in empty-shell machine)
When dry heating fault, over-temperature fault and sensor turnoff or short circuit appears, nixie tubes
on display screen respectively show E2, E3 and E4 with blinking display. All other nixie tubes and
indicator lights do not show signs. For instance, if there is a buzzer, it will give six short alarms. At this
moment, all relays are switched off and all keys do not work. After failures are removed and electricity
is conducted again, water heater will recover to the power-off state. When in power-up state, system
automatically conducts self-inspection. If there is fault, corresponding fault code will be displayed
accordingly and system cannot work (i.e. water heater is unable to start.)
Identification of dry heating fault: when system detects that rising slope of inner container
temperature is ≥ 15
o
C /min or ≥ 8
o
C /30S and temperature is greater than 50
o
C, fault code E2 is
showed on display screen with blinking display.
Identification of over-temperature fault: when the temperature of temperature sensor of inner
container is greater 90
o
C, over-temperature is identified and fault code E3 is showed on display
screen with blinking display.
Identification of sensor fault: in case of sensor turnoff or short circuit, an alarm will be given and
fault code E4 is showed on display screen with blinking display.
4.4 Other technical requirements
1. The overall dimension and installation dimension of control panel and power panel, height of
components and parts, signal line between each other and so on are in conformity with the
corresponding drawings. Besides, control panel and power panel shall have good
interchangeability during matching. All circuit board materials adopt 1.6 mm thick anti-flaming
epoxy board with damp proof treatment. A complete set of controller shall be subject to ageing
treatment before leaving factory.
2. When PCB board is laid out, creep distance shall be guaranteed to satisfy corresponding
standard. That is, wires are not allowed to be installed within 3mm of location hole.
5.1 Maintenance
Warning: Do cut off power supply before maintenance, to avoid danger like electric shock.
Check the power plug and outlet as often as possible. Secure electrical contact and also proper
grounding must be provided. The plug and outlet must not heat excessively.
If the heater is not used for a long time, especially in regions with low air temperature(below 0
o
C),
it is necessary to drain water from the heater to prevent damage of the water heater, due to water
freezing in the internal tank.(Refer Cautions in this manual for the method to drain away the water
from the inner container).
To ensure long reliable water heater operation, it is recommended to regularly clean the internal
tank and remove deposits on the electric heating element of the water heater, as well as check
condition (fully decomposed or not) of the magnesium anode and, if necessary, replace it with a
new one in case of full decomposition. Tank cleaning frequency depends on hardness of water
located in this territory. Cleaning must be performed by MODENA or special maintenance
services.
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