1.
INSTALLATION INSTRUCTIONS • TYPE K
TFII-14
J17-63967
TWIN-FLOIII
®
HEATER
GENERAL DESCRIPTION
TWIN-FLO III heaters are for use with forced hot water residential heating systems and consist of a copper tube,
aluminum fi nned heating element, with an electric motor and blower of unique cross fl ow design. Their purpose is to
deliver a comfortable stream of warmed air, at or near fl oor level, and their construction is extremely compact so minimum
space is required for installation. The type K heater is primarily used in horizonal fl oor installation, for example: under a
kitchen counter cabinet, or bathroom sink enclosure. They are ideal for radiant systems with the use of a low temperature
aquastat designed to turn the unit on at 110° F. Type W is for vertical mounting, fully recessed in the wall studs, with the
air discharged upward through a fl ush mounted, louvered front panel. Type F is a surface mounted wall unit, with the
air discharged evenly through a louvered front panel in an upward direction. All types have heating elements with 1/2"
nominal (5/8 O.D.) copper tube connections, and 115V. electric blower motor, interwired with a 120° F (49° C) reverse
acting aquastat that prevents operation until hot water is circulating. These units are NOT intended to be used on one or
two pipe steam systems. See bottom of page 5. For gravity fed systems, it is recommended that a separate circulator pump
be installed for the kick space heater.
INSTALLING TWIN-FLO III TYPE K
1. Select a location under the bottom shelf of a cabinet that meets the minimum dimensions shown in Fig. A.
2. CUT AN ACCESS PANEL THROUGH THE BOTTOM OF THE CABINET AT THIS LOCATION, LARGE ENOUGH
FOR INSTALLATION AND SERVICE. IT IS RECOMMENDED THAT THIS ACCESS PANEL BE CONSTRUCTED SO
ANNUAL CLEANING OF THE BLOWER FAN AND COIL FINS CAN BE EASILY ACCESSIBLE.
3. At this location, center and cut an opening in the toe-space riser 4'' high x 11'' long (model K42) (See fi gure A)
or 4'' high x 18'' long (model K84) (See fi gure B) or 4" high x 23" long (Model K120). (See fi gure C).
4. Set the TWIN-FLO III in the space at fi nished fl oor level and check piping and wiring locations. The air outlet
should be facing but not extending beyond the toe-space riser at the opening. The air outlet should also be located at
the bottom portion of the 4'' toe-space riser (See fi gure A) at fi nished fl oor level. Make sure the switch is accessible
through the grille openings. The front of the unit should fi t fl ush to the inside of the toe space riser.
5. Install the grille over the 4'' toe-space opening with the two screws provided.
6. If using the TWIN-FLO "Easy Connect" Flexible Hose Connection Kit, see those installation instructions.
7. Next, prepare the heating element for pipe connections (this procedure will also pertain to Model types W and F).
Remove the 3 screws from the electric conn. box. Unsnap (pull) the thermostat clamp from the return copper U-bend.
Holding down the top cover, remove the 4 element cover screws. Carefully remove this top cover noting the position of
the element and the neoprene side pad. Lift out the element for soldering and fi ttings. Both ends are sized to accept
1/2'' solder fi ttings. (Note required fi ttings for one pipe and two pipe systems on page 6).
8. Replace the heating element in the bottom cover in the proper position. Place the neoprene side pad in position and
replace the top cover using the 4 screws. Tighten enough to keep the element in place between the covers. DO NOT
OVER-TIGHTEN!
9. Place the TWIN-FLO III under the cabinet and connect the piping and wiring. Make sure unit & outlet are free of any
dirt or debris prior to start up. Turn on the system, purge of air, check blower operation and check for any possible
leaks in the piping (run for 2 hrs. minimum). It should then be screwed to the fl oor through the four resilient mounting
feet (2-inside electrical box and 2 external). Do not over-tighten screws. Secure top of electrical box.
ATTENTION: READ THESE INSTRUCTIONS CAREFULLY BEFORE ATTEMPTING TO INSTALL, OPERATE, OR SERVICE
THE BEACON MORRIS TWIN-FLO III HEATERS! RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE.
INSPECT THE SHIPMENT IMMEDIATELY WHEN RECEIVED TO DETERMINE IF ANY DAMAGE HAS OCCURRED
DURING SHIPMENT.
PRIOR TO INSTALLATION, CHECK FOR ANY VISIBLE DAMAGE. MAKE CERTAIN THAT ANY LOOSE PARTICLES
ARE REMOVED (ESPECIALLY IN THE BLOWER ASSEMBLY AREA).
SAFE TO USE WITH POTABLE WATER.
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