Model IGX Make-Up Air
22
®
Installation
Piping
1. Install the Water Supply Line
Supply line opening requirements vary by unit size and
arrangement. Connect the water supply line to the float
valve. A field-provided opening must be created for the
supply line.
The supply line must be of adequate size and pressure
to resupply the amount of water lost due to bleed-off
and evaporation. The drain line should be the same size
or larger than the sump tank drain connection.
Auto Drain and Fill
or Single Pass
- Install the 1/2 in.
normally closed solenoid (Valve A) in the supply line.
Install the 1/4 in. normally open solenoid (Valve B)
between the supply line and the drain line.
2. Install the Drain Line
Recirculating Pump
- Connect an unobstructed
drain line to the drain and overflow connections on the
evaporative cooling module. A shut off valve (by others)
is required in the drain line. A trap must be provided for
proper unit drainage.
Auto Drain and Fill
- Connect an unobstructed drain
line to the sump overflow connection. Install the 3/4 in.
normally open
solenoid (Valve C)
between the sump
drain connection and
the drain line. A trap
must be provided for
proper unit drainage.
Single Pass
- Connect an unobstructed drain line to the
sump drain and overflow connections. A trap must be
provided for proper unit drainage.
6 in./min. (0.254 cm/sec)
6 in./min. (0.254 cm/sec)
Drain
Trap
Optional Evaporative Cooling Module
(continued)
3. Check/Adjust Water Level
Check the water level in the sump tank. The water level
must be above the pump intake and below the overflow.
Adjust the float as needed to achieve the proper water
level. The float can be adjusted by bending the float
lever arm. The single pass system does not use a float
valve and does not retain water in the sump tank.
Note: The manufacturer recommends that units
equipped with evaporative cooling be installed
outdoors. If an evaporative cooling module must
be installed indoors, it is recommended that a
field-supplied secondary drain pan be installed
under the evaporative cooling section. This will help
mitigate damage to building materials in the event the
evaporative cooling module sump tank overflows.
Bleed-Off
Valve
Overflow
Pump
Filter
Supply
Connection
Float
Valve
Evaporative Cooling Module Set-Up
