11
®
Model MSX Make-Up Air
Evaporative Cooling with Auto Drain and Fill
continued
1. Install the Water Supply Line
Supply line opening requirements vary by unit size
and arrangement and are field supplied. Connect the
water supply line to the float valve through the supply
line opening in the evaporative cooling unit. 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. Refer
to Auto Drain & Fill Evaporative Piping drawing on
previous page.
2. Install the Drain Line
Connect an unobstructed drain line to the sump drain
overflow connection. Install the 3/4 in. normally open
solenoid (Valve C)
between the sump
drain connection
and the drain line.
A trap should be
used to prevent
sewer gas from
being drawn into
the unit.
3. Check/Adjust Water Level
Check the water level in the sump tank. The water
level should be above the pump intake and below the
overflow. Adjust the float as needed to achieve the
proper water level.
6 in. min.
6 in. min.
Drain Trap
