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Absolute Boilers ABS 1500-2000-2500-3000-4000
5.3 Power consumption (watts)
ABS 1500
956
ABS 2000
956
ABS 2500
1440
ABS 3000
1275
ABS 4000
1912
5.4 Limit Controls
5.4.1 Temperature control
The Absolute boiler is equipped with an electronic temperature limit control based on flow, return, and flue gas
temperature sensors. The flow temperature is adjustable between 68-200°F [20- 93°C].
5.4.2 Low water level protection (LWCO) (flow and content)
The Absolute boiler is equipped with low water protection based on temperature differences (ΔT) between flow and
return. When the ΔT = 45°F [25°C] (factory setting) the boiler starts modulating down so that it remains operational
as long as possible. When the ΔT = 72°F [40°C] the boiler will be at part load.
If the ΔT continues to rise and reaches 81°F [45°C], the boiler shuts down, and will restart when conditions return to
normal.
The boiler has been approved and has found to be in compliance to the LWCO protection, provided the factory preset
high limit and flow temperatures are not altered and the modulating controls are used and no minimum flow rate is
required as the Sola control system will monitor these conditions and reduce the boiler output, finally shutting down
until flow conditions improve. As a result, the boiler is virtually
and content protection is provided, does not safeguard the entire heating system, additional low water content and
temperature safety controls maybe needed in certain jurisdictions. In the event the low level is too low a RED light will
flash on the low water cut off. To reset this device the technician needs to press the reset button.
This limit device also has test button, when this button is pressed down the controls shuts the boiler down. To reset
this again the operator needs to reset the device by pressing
the reset button.
5.4.3 High limit protection
The high limit temperature protection device switches off and
locks out the boiler when the flow temperature exceeds the
maximum set point temperature. This is a manual reset .
5.4.4 Air pressure switch
This device proves to the control the blower motor is on,
and that airflow is flowing into the boiler. The adjustments
screw is located on the back of the device. This should only
be adjusted by a qualified technician. No adjustment in the
field is required, as the boiler was test fired in the factory
before shipment.
unaffected by low water flow. Although boiler flow
48
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