BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
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Installation Instructions Section 2
2.1 RECEIVING
INSPECT SHIPMENT FOR POSSIBLE DAMAGE. All goods are carefully manufactured, inspected,
checked and packed by experienced workers. The manufacturer's responsibility ceases upon delivery of
goods to the carrier in good condition. Any claims for damage, shortage in shipment or non-delivery must
be filed immediately against the carrier by the consignee.
2.2 INTRODUCTION
Super Hot Electric Boilers are controlled by a three-stage electronic temperature controller. The
controller controls the boiler water temperature with three stages and turns stages on based on the
heating demand, time delay, and the preset boiler outlet water temperature. The controller also can
control 120Vac circulating pumps rated up to 5A or 600VA. When the thermostat calls for heat, the
controller will operate the boiler to regulate the water temperature at a pre-selected setpoint. The system
pump is on whenever there is a thermostat calling for heat.
Multi-stage electric boilers have a number of advantages over conventional on/off single stage boilers.
Instead of switching on/off all heating elements using sequencers, each stage of a multi-stage boiler is
controlled directly by the controller to minimize both temperature fluctuations and reduce the number of
on/off operations of the contactors/heating elements. The on/off times of each of the stages are
separated by a pre-determined minimum time interval to avoid a surge in line current. The average “cycle
time” of each of the heating elements shall be greatly increased. This ensures better temperature
stability, extends the life of the boiler and increases energy efficiency.
2.3 BOILER LOCATION
The boiler is intended for indoor installation only and must not be subjected to water spray or leakage. It
may be installed in an enclosed space and attached directly to a combustible surface. Allow ample space
around the boiler to ensure all connections and controls are readily accessible. The minimum required
clearances for service are shown in the following table:
Minimum Clearance Provides service access for
left side = 18 inches elements
right side = 12 inches plumbing connections
front = 12 inches electrical components and fuses
It may be preferred to locate the boiler close to the electrical supply panel.
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