Form I-ADF, Page 14
FIGURE 11A -
Factory-installed
Evaporative Cooling
Module Option on
Models ADF/ADFH 300
and 500
Evaporative cooling provides excellent comfort cooling at low initial equipment and
installation costs and low operating and maintenance costs. Direct evaporative
cooling works on the principles that water in direct contact with a moving airstream
will eventually evaporate if the droplets have long enough exposure and that the
evaporation will lower the air temperature.
The optional evaporative cooling module is equipped with high efciency pad media
of either 12" rigid cellulose or 12" rigid glass ber. 12" media provides 90% efciency.
Efciency value is stated at maximum allowable CFM (without the optional moisture
elimination pad) and with an inlet dry bulb temperature of 95
°
F and an inlet wet bulb
temperature of 65
°
F. Evaporative cooling efciency is a function of inlet temperature
(wet and dry bulbs) and of face velocity through the pads. The stated cooling efciency
will rise with the decrease of velocity and increase of inlet temperature. Moisture
elimination pads (Option ASA1) may be used on all units but are required on high CFM
units (velocity above 6000 FPM) as listed in the table below.
Model/Size
Moisture Elimination Pad Required Size
on the Evaporative Cooling Module at
ADF/ADFH 300 3200 CFM
ADF/ADFH 500 4500 CFM
ADF/ADFH 700 11200 CFM
ADF/ADFH 1200 11200 CFM
Models ADF/ADFH 300/500 - When ordered with an evaporative cooling option, Sizes
300 and 500 are shipped as a factory-assembled makeup air heating/evaporative
cooling system. The module is factory installed including all wiring connections (See
FIGURE 11A). Follow the instructions in this section for water connections and water
ow adjustments.
6.2.4 Evaporative
Cooling Module -
Options AS4 and AS8
FIGURE 11B -
Dimensions of optional
evaporative cooling
module factory-installed
on Sizes 300 and 500
3. Re-insert all of the screws across the top of the cabinet.
4. The lter cabinet should be resting on the factory-installed support angle across
the bottom of the cabinet. If the cabinet does not rest tightly against the support
angle, follow these instructions to adjust the position of the support angle:
a) Slightly loosen (do not remove) the support angle screws.
b) Slide the support angle up (holes are slotted) so that it is against the bottom
panel.
c) Tighten the screws.
5. If equipped with an optional dirty lter switch, locate the coil of clear tubing attached
to the dirty lter switch in the electrical compartment. Extend the tubing to the air
entering side of the lter rack. Attach the end of the tubing being careful that it is not
compressed or kinked. (See Paragraph 7.3 for switch details.)
Models ADF/ADFH 700/1200 - The evaporative cooling module for Sizes 700 and
1200 is assembled at the factory and shipped separately for eld-connection to the
makeup air system cabinet. The shipped separate option includes the cooling module,
6.0 Mechanical
(cont'd)
6.2 Unit Inlet Air
(cont'd)
6.2.3 Indoor Filter
Cabinet (cont'd)
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