Beacon Morris Twin-Flo
III
Heaters should be connected only to circulating
hot water systems
where at
least 1 gpm water fl ow is expected. They are essentially small unit heaters, and will work on one or two pipe
systems, or in a series loop where pressure and temperature drop can be tolerated (see capacity charts and
piping diagrams). These units are not designed for use with steam systems. See bottom paragraph on page 7.
These units are not recommended to be used with a gravity fl ow system. Series loop systems do not require
scoop or venturi tees.
4.
Piping Charts
System Considerations
Maintenance & Service
Properly installed, the Beacon Morris TWIN-FLO
III
heater should require very little attention. Since the
heating element is carefully constructed and tested, and of non-ferrous materials, it should never require
service. The cross-fl ow blower has been thoroughly engineered, with ball bearings for 10,000 hrs. bearing life
expectancy.
As with any electrical rotating device, a yearly inspection and cleaning is recommended.
Wherever there is air movement, there will be some accumulation of dust and lint. In this case it will collect on
the rotor blades and air passage of the unit. Regular cleaning with a vacuum cleaner tool is advised, with fre-
quency determined by prevailing conditions.
Always make sure that the air grille is not blocked by foreign
objects or materials.
NOTE: In an up feed system, unit is located above hot water supply line. In a down feed
system, unit is located below hot water supply line.
For One Pipe System Down Feed, two directional fl ow tees should be used. They should be spaced 12
to 18 inches apart. To better understand directional fl ow tee installation, refer to page 5.
If directional fl ow tee's are not available, an adjustable screw operated fl ow control or circuit setter
can be placed between the two standard tee's in a one pipe system.
For consistent response of the reverse acting thermostat, and effective outlet air temperature,
the average water temperature should not be below 120° F (49° C). Blower motor shuts off at
105° F (41° C) and will not operate until water temperature reaches 120° F (49° C).
If utilizing water temperature below 120° F (49° C), the blower will not operate with the self contained
aquastat. An optional low temperature aquastat, 110° to 95° F (43° to 35° C) is available.
Installation should be done with as few fi ttings as possible. Multiple fi ttings may cause too much resistance.
