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FIG. 61 Typical Building Management System Diagram
HIGH WATER TEMPERATURE
LIMIT CONTROL
FIG. 62 High Water Temperature Control
A Manual Reset High Limit control is located on the left front side
of the control panel, beside the Command Dis play. Additional
switches, alarm in di cat ing lights and optional low water cut-off
control switches are also located on this panel. The setting of this
con trol knob limits maximum discharge water temperature. A red
reset but ton, located beside the knob, must be pushed whenever
water temperature has exceeded the set point of manual reset limit.
The temperature of the water in the heat exchanger must drop a
minimum of 15°F (8.3°C) below the setting of the manual reset
high limit control before the reset function can be activated.
A red indicating light is illuminated when the water temperature
exceeds the set ting of the high limit control. A sta tus point alarm of
Over Temp will be displayed in the Command Display when water
temperature exceeds the Set Point Temperature programmed into
the Excel 10 control on operation of the high water temperature
limit control.
NOTE:
The high limit control will not reset until the water
temperature has dropped below the set point of the high
limit.