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Marvair Scholar III™ VAISA I&S Manual 03/2019 Rev. 8
The thermostat is preprogrammed at the factory to maintain a heating mode
temperature of 64°F, and a cooling mode temperature of 82°F. To change these
settings refer to the directions in installation instructions for the thermostat.
5. For units with the reheat dehumidification option, the humidity controller (p/n
50057) is remotely mounted on the wall in accordance with the same instructions
for the mounting of the wall thermostat installation given in Section 1.12 of this
manual. Low voltage leads from the humidity controller are brought into the
terminal strip area as shown by routing through the raceway noted in Figure 8,
where the “R” lead is connected to the R terminal on the terminal strip. The other
lead is connected to HUM on PLC as noted on the wiring schematic of the heat
pump. See Figure 9a.
C. Condensate drain line hook-up will be from the vertically downward 3/4” female PVC
slip fit port located just behind the breaker disconnect box in the lower right corner of
the Scholar III™ heat pump or air conditioner. Reference Figure 5 for the location of
the fitting. Because the condensate drain trap is factory installed, run the drain line
directly to the roughed-in stub out. All materials for the condensate drain hook-up are
field supplied.
D. 1.
Wet heat hook-ups
are done by connecting the rough-in piping to the factory
supplied coils inside the plenum.
For
hot water heating
, the plenum is equipped with a coil and a freeze
protection thermostat embedded in the coil. An optional diverter valve may also
be factory installed. The front and top panels of the plenums are removable,
to access the coil and make piping and wiring connections. Consult hot water
plenum installation instructions for installation details or see Appendix C in back
of this manual.
1.12 VENTILATION SYSTEM CALIBRATION
Prior to start-up of the Scholar III™ heat pump or air conditioner, the ventilation
system requires calibration to ensure the appropriate amount of fresh air is delivered
to the classroom. Refer to the appropriate following ventilation system and use the
instructions to calibrate the system for correct air delivery.
A. Manual Fresh Air System. This ventilation module is standard with the Scholar III™
heat pump and air conditioner. Fresh air ventilation by means of a damper with
pressure relief provides up to 450 cfm of outside air. The damper can be manually
adjusted at installation to provide the required ventilation airflow.
The fresh air door should be set in accordance with the amount of fresh air flow
required, up to a maximum of 450 CFM. Figure 10 illustrates the fresh air door
settings and air flow rates.
Follow the directions in Figure 10 to ensure proper air flow rate settings. After
calibrating the ventilation system, replace the lower front cabinet panel.
B. Two position motorized damper and PowerVent Fresh Air Systems. The two position
(open & closed) ventilation module is equipped with a motorized damper and
pressure relief, and provides up to 450 cfm of outside air. The damper position can
