Service manual

MSE Series Electric Boilers – Installation and Service Manual
4
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
The Super Hot Mini-Star
®
Electric Boiler provides convenient and comfortable hydronic heating for closed
loop systems in both residential and commercial applications. It is controlled by the BC-1 controller which
regulates the boiler water temperature using three stages, switching stages on or off based on heating
demand, PID (proportional, integral, differential) logic, and user-defined water temperature settings. The
controller is capable of controlling a 120 Vac circulating pump (rated up to 5A or 600VA) which activates
when there is a thermostat or DHW call for heat.
Using three stages to regulate the boiler water temperature has advantages over conventional on/off
single stage boilers. Instead of switching all heating elements on or off using sequencers, the BC-1
controls each stage directly to minimize temperature fluctuations, avoid surges in line current, and reduce
the number of on/off operations of the contactors and heating elements. Because the average “on/off
cycle” of each of the heating elements is greatly decreased, this ensures better temperature stability,
extends the life of the components and increases energy efficiency.
With the addition of an Outdoor Sensor to the BC-1 controller, “Outdoor Reset” can be used to increase or
decrease outlet water temperature based on changing outdoor air temperatures. This feature helps
reduce temperature swings and allows the boiler output to more closely match the actual heating load.
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 (458 mm) elements
right side = 12 inches (305 mm) plumbing connections
front = 12 inches (305 mm) electrical components and fuses
top = 10 inches (254 mm) screws for front casing panel
bottom = 10 inches (254 mm) screws for front casing panel
It may be preferable to locate the boiler close to the electrical supply panel.
Protection from Liquids
The controller and other components located within the control panel are sensitive to water and other
liquids. Measures must be taken to fully protect components on the control panel from contact with liquids.
This especially applies to overhead pipes which may leak, burst or drip condensate and cause damage.