Marvair Scholar 2.0 I&S Manual 04/2022 Rev.2
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distribution system. If only the freeblow plenum is used (no external duct work), the
blower automatically slows down. When duct is used, the EC blower automatically
speeds up to compensate for the additional static pressure. The blower automatically
slows down when in the ventilation mode (compressor off) to deliver the required
cfm of fresh air to the classroom. No field adjustment of the blower is required. Install
plenum to top of cabinet after shipping plate has been removed from electric heater
(if appropriate). Instructions are included with plenum or see Appendix C at end of
manual.
The air distribution system which is field supplied and installed downstream of the
specified
ducted plenum
must be engineered to assure sufficient air flow, even
under adverse conditions, such as dirty filters. The information provided in Figure
1, Appendix A should be used to design the air distribution system duct size leaving
the Scholar 2.0 heat pump or air conditioner, keeping the external static pressure to
a minimum.
Applications using duct work should be designed and installed in accordance with
the current edition of the National Fire Protection Association codes and standards
90A and 90B. The duct system must be engineered to insure sufficient air flow
through the unit to prevent over-heating of the heater element. This includes proper
supply duct sizing, sufficient quantity of supply registers, adequate return and filter
area. Ductwork must be of correct material and must be properly insulated. The duct
work must be constructed of galvanized steel with a minimum thickness of .019.
Ductwork must be firmly attached, secured and sealed to prevent air leakage. Do not
use duct liner on inside of supply duct within four feet of the unit.
Galvanized metal duct extensions should be used to simplify connections to
ductwork and grilles. Use fabric boots to prevent the transmission of vibration
through the duct system. The fabric must be U.L. rated to a minimum of 197°F.
G. Install the outdoor louver/collar assembly to the outdoor side of the wall opening.
The louver/collar assembly may be fastened to the air box (or air box extension) as
described in the instructions for outdoor louvers/collars. The louver must be installed
with the blades pointing downward on the outside and the louver and the collar must
be water sealed to the outside wall surface with the appropriate caulking material.
See the instructions that come with the outdoor louver for installation details or see
Appendix F at the end of this manual.
H. Weather Panels are field supplied and do not come with the Scholar 2.0 heat pump
or air conditioner. If a weather panel covers the wall opening described in Figure 2,
remove the weather panel prior to installing the unit into the wall opening.
I. After measuring for correct locations of power/control wiring entry, condensate drain
line, and the appropriate wet heat lines, remove the appropriate knock-out access
ports from the cabinet. Be sure they align with the rough-in points for the noted
pipes and wires. Be sure electrical, condensate and wet heat piping will not cause
interference or be damaged by sliding the Scholar 2.0 heat pump or air conditioner
into place.
IMPORTANT
BE SURE TO SEAL THE OPEN AREAS BETWEEN LINES ENTERING THE SCHOLAR 2.0
CABINET AND THE KNOCKOUT OPENINGS, TO PREVENT AIR LEAKAGE.
