Carrier 48MA User Manual
Page 23
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supply cfm — much lower than the unit was
designed for. If the supply cfm is raised to satisfy
the unit, the purpose of the return air light troffers
is defeated. As a general rule, a return air tempera
ture rise of 5 to 10 F does not cause a problem,
and special ratings can be made available.
In addition, when the supply cfm is reduced, as
above, the outdoor air quantity remains constant.
This results in a higher than normal percentage of
outdoor air which the 48MA/50ME unit may not
be capable of introducing. For return air light
troffer systems, exercise care when using the light
manufacturers’ data concerning the amount of heat
actually returned to the unit because with the
higher return air temperature, a portion of the heat
is transmitted back to the space thru the ceiling.
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