5
Plenum Duct
The plenum duct can be run in practically any location
accessible for the attachment of the supply tubing (see
suggested layouts in Figure 1.3). The plenum is normally
located in the attic or basement, and it is usually more
economical to run the plenum where it will appreciably
shorten the lengths of two or more supply runs.
In some two-story split level homes, it may be advanta-
geous to go from one level to another with the plenum
duct. Whenever necessary, either between floors or
along the ceiling, the small size of the plenum makes it
easy to box in.
The fan coil unit is designed to operate with a total external
static pressure of 1.8 inches of water column (minimum
1.2 - maximum 1.8). Excessive static pressure increases
the air flow in individual runs and may cause some or all
terminators to be noisy.
FIGURE 1.3: PLENUM/TUBING LAYOUT EXAMPLES (FOR GUIDANCE ONLY)
For systems designed with a bullhead tee installed as on
Unit No. 1 (Figure 1.4), the best results are obtained if not
more than 60% of the total number of system outlets are
attached to any one branch of the tee. For systems with
a branch tee installed as on Unit No. 2 (Figure 1.4), not
more than 30% of the total number of system outlets
should be attached to the perpendicular branch of the tee.
The ESP-4860JV has some additional plenum installa-
tion requirements that the smaller systems do not. This
is due to the twin blower arrangement.
NOTE: For installations replacing B or C series units
refer to retrofit instructions on page 22.
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