Installation and
Operating Instructions
ELECTRIC HOT WATER
&
STEAM BOILERS
Страница 1: ...Installation and Operating Instructions ELECTRIC HOT WATER STEAM BOILERS...
Страница 2: ...injury or property damage Read this manual thoroughly and follow the instructions herein The PRECISION Boilers shall be installed according to the procedures detailed in this manual or the Precision...
Страница 3: ...2 Operating Instructions 9 5 2 2 Electric Door Interlocks 9 5 2 4 120 Volt Power Source 9 5 2 6 Alarm and Reset Circuits 9 5 2 7 Sequencing of Element Circuits 9 6 0 SEQUENCE OF OPERATION 6 1 Activati...
Страница 4: ...f the authorities having jurisdiction 1 3 Recommendations 1 3 1 Preventative Maintenance A Preventative Maintenance Schedule is provided as a recommendation for periodic equipment Inspections Recordin...
Страница 5: ...rs are not suitable for placement on combustible flooring 2 4 2 Leave a permanent space for element removal opposite element access panels as shown on the Dimensional Drawing DD and 36 inches opposite...
Страница 6: ...ors The unit is equipped with grounding lugs s inside the power panel s The grounding conductors must be installed and sized in accordance with NEC Article 424 14 The recommended size is noted in the...
Страница 7: ...fuses Then check the resistance phase to phase for all three phases Make sure that there are no short circuits phase to phase or phase to ground With a megger 500VDC minimum check contactor load side...
Страница 8: ...t during the first day of operation the affected element will not be energized allowing the hot water to drive the moisture out at a controlled rate 4 4 3 Removal of Moisture in Element method 2 An al...
Страница 9: ...same margin as specified for high limits to be above the controller setting 5 2 Operating Instructions 5 2 1 With the unit s control power ON OFF or ON OFF PREHEAT switch OFF close the main power swi...
Страница 10: ...tactor coil circuits 6 2 2 Proportional Step Controls 6 2 2 1 Step Control Sequence The controller senses the unit s water temperature either via 135 ohm device or thermistor or steam pressure either...
Страница 11: ...int the step controller should bring on nominally one half of the steps An adjustable proportional band is provided on the controller sensor to enable tuning the unit to system demand 7 1 2 Solid Stat...
Страница 12: ...cause an automatic inverse change of 1 F at the control point NOTE Refer to the applicable vendor literature provided on both the setpoint controls and step controls installed in your boiler 8 0 PREV...
Страница 13: ...k torque on element flange bolts The acceptable torque range is 10 15 ft lbs CAUTION Do not over tighten elements 8 4 2 Remove and replace any leaking elements or element gaskets Inspect handhole and...
Страница 14: ...ement gaskets should be replaced immediately upon leak detection 8 5 1 Adequately tag wire and then remove wires from defective elements 8 5 2 Remove element by removing the four 4 attachment nuts 8 5...
