Scholar V VAIVA Maintenance & Service Manual 10/2017 Rev.2
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10. SCREEN 10: Reheat Settings
(Changes require username/password)
Supply air reheat is used during dehumidification to heat the supply back to the cooling set-
point. This allows for moisture removal (latent cooling) by cooling the air as it passes through
the evaporator, but inhibits sensible cooling by reheating the air, adding back the sensible
component.
Both hot gas reheat and electric reheat can be used. Hot gas reheat is always provided, but
electric reheat may be enabled or disabled based on user preference.
a. Elect. Rht. Enable
: Press this button to enable electric reheat. The status can be
seen in the box below the buttons.
b. Electric Rht. Disable
: Press this button to disable electric reheat. The status can
be seen in the box below the buttons.
c. Hot Gas Reheat Diff (°F)
: This is the same setting as earlier described in Screen 4
(Differentials and Deadbands)
d. Electric Re-heat Set Diff. (°F)
: This value establishes the temperature at which
the electric heat will come on, if enabled. The electric heat ON point is calculated
by subtracting the differential from the cooling set point. For example, if the cooling
set point is 75°F and the Elect. Re-heat Set Diff. is 5°F, the heat will come on when
the supply air is cooled down to 70°F (75°F - 5°F).
e. Elect. Re-heat ON/OFF differential
: This value is added to the ON temperature
setting to determine the OFF setting. Going back to the above example, if the ON
temperature is 70°F and the Elect. Re-heat On/OFF Diff. is 2°F, the heat would turn
off at 72°F (70°F + 2°F). Then would come back on at 70°F and cycle on and off
accordingly.
f. Elect. Reheat ON (°F), elect Reheat OFF (°F) (Read Only)
: These boxes show
the calculated values for the ON and OFF temperatures explained above. They
are “Read Only” and cannot be changed.
g. Forward
: Press once to go to the next screen.
h. Back
: Press once to go to the previous screen
i. Back to Main
: Press once to go back to Main Screen.
