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4
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 1.2). 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.
PLENUM
FOR
ESP- 4860
ONLY
PLENUM
FAN COIL
UNIT
PLENUM
FAN COIL
UNIT
PLENUM
FAN COIL
UNIT
PLENUM
FAN COIL
UNIT
FIGURE 1.2: PLENUM/TUBING LAYOUT EXAMPLES (FOR GUIDANCE ONLY)
The blower coil unit is designed to operate with a total
external static pressure of 1.5 inches of water column
(minimum 1.0 - maximum 1.5). Excessive static pressure
increases the air flow in individual runs and may cause
some or all terminators to be noisy.
For systems with a tee installed as on Unit No. 1 (Figure
1.3), 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 tee
installed as on Unit No. 2 (Figure1.3), not more than
30% of the total number of system outlets should be
attached to the perpendicular branch of the tee.