Greenheck Fan IGX-HV - Manual (Page 5)

5
An evaporative cooling section includes a galvanized
steel housing with a louvered intake, two inch aluminum
mesh filters and a stainless steel evaporative cooling
media housing. The evaporative cooling media is
Munters CELdek or GLASdek and has a depth of
12 inches for 90% cooling effectiveness.
Drain and overflow lines are conveniently stubbed
through the side of the cooling section. The supply line
connection is field located where convenient.
IGX-HV airflow capacity for evaporative cooling is up
to 14,000 cfm. Below 9,000 cfm, evaporative cooling
modules ship attached and factory wired. Field
attachment is required for airflow above 9,000 cfm.
Mixing Box controls:
Mixing box control option EC1 is recommended for use
with evaporative
cooling. On a call
for cooling when
the outdoor air
temperature is below
the economizer
setpoint, the
dampers modulate
to provide cool
mixed temperatures
down to 55° F. When
the outdoor air is
above the economizer setpoint, the evaporative cooling
section is energized and the dampers travel to the 100%
outdoor air position.
The MB mixing box options are NOT recommended in
conjunction with evaporative cooling.
cooLInG oPtIons
evaporative cooling
Model IGX-HV boasts the flexibility of Chilled Water or
Direct Expansion (DX) cooling with capacity to 11,000
CFM. The cooling section includes the cooling coil,
stainless steel drain pan and insulated double wall
construction. Drain and coil connections are stubbed
through the wall for convenience.
For proper coil sizing, use Greenheck’s Computer Aided
Product Selection (CAPS) program or contact your local
representative. Four and six row coils are available.
Cooling coil sections are installed downstream of the
mixing box section for a draw through arrangement.
This provides a streamlined transition to adjacent
IGX-HV sections. DX coils require remote condensing
units.
Mixing Box controls:
All MB and EC mixing box control options are available
with chilled water or DX cooling coils.
For economizer
climates, the
EC1 option is
recommended.
Mixing box options
operate as described
on page 4.
thermostats:
The cooling coil
and MB mixing box
control options may
use a 1-stage (chilled
water or single stage DX) or 2-stage (dual stage DX)
cooling thermostat.
The cooling coil and EC mixing box control options
require a 2-stage cooling thermostat. Economizer
represents the first stage of cooling and a single DX
stage or chilled water coil represents the second stage
of cooling.
cooling coils
Mixing Box selection Guide
*Two-stage cooling thermostat required. Boldface type indicates factory recommended options.
ec options MB options
ec1 ec2 ec3 ec4 MB1 MB2 MB3 MB4
no cooling Yes Yes Yes Yes Yes Yes Yes Yes
evaporative
cooling
Yes Yes
Not
Recommended
Not
Recommended
No No No No
chilled Water or
dX cooling
Yes* Yes* Yes* Yes* Yes Yes Yes Yes