Magikist HWG20, Instruction Manual

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The HWG20 and HWG40 heaters are designed to
provide hot water on demand at a given temperature
setting. These heaters will automatically regulate the
temperature of the outlet water to that which you
desire by cycling on and off as required. Because
these heaters are not storage type heaters, they must
also cycle on and off dependent on whether or not
there is water flow.
The operation of the heater is controlled and monitored
by the
P
R O
S
A F E
II
industrial heater control, an
advanced microcontroller that monitors several
aspects of the heater operation in order to provide safe
and effective control of the heater. The
P
RO
S
AFE
II
control provides visual status to the operator of the
heater through it’s front panel display on the heater. It
also provides the setting for the outlet water
temperature desired from the heater.
Should some condition arise which results in the
heater exceeding its normal operating temperature, the
P
R O
S
A F E
II
control provides overheat lockout
protection, thus protecting the heater and operator
from the dangers of a heater overheat condition. The
P
RO
S
AFE
II
control also provides coil protection via a
coil freeze warning should the temperature in the flue
ever drop near the freezing point. Other conditions
which affect the operation of the heater are detected
and displayed to the operator by the
P
RO
S
AFE
II
control.
Following is a description of the indicators and their
function on the
P
RO
S
AFE
II
control.
6.1 TEMPERATURE SETTING
The temperature setting display on the P
RO
S
AFE
II
control displays the current desired outlet
water temperature from the heater. To change the
temperature setting press the up or down arrow
buttons located below the temperature setting
display. Pressing and holding either of the up or
down arrow buttons will result in the temperature
setting changing slowly until a change of 5°, after
which the setting will change rapidly until either
button is released.
The temperature setting ranges from 40 to 200°F
or 5 to 95°C depending on the temperature scale
chosen. The current temperature scale is
indicated by a red dot next to either the °C or the
°F by the temperature setting display.
The temperature setting display is also used to
indicate any error condition detected by the
P
RO
S
AFE
II
control. When an error condition
exists the current desired outlet water temperature
is replaced by a flashing error code(s). Refer to
the section 7.0
P
R O
S
A F E
II
ERRORS &
WARNINGS for diagnosing error conditions.
6.0 P
RO
S
AFE
IIII
CONTROL
Current desired outlet
temperature setting.
Dot indicates °C or °F.
Indicators provide
operational status
of heater.
Use up and down arrows
to adjust current desired
outlet temperature.
Connections to ProSafe II