Greenheck DGX Installation, Operation And Maintenance Manual page 12

Installation - Evaporative Cooling Piping (Optional)
Evaporative Cooling with Recirculating Pump.
All supply solenoids, valves and all traps must be below the roofline or be otherwise protected from
The supply line should 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 supply line.
Provisions must be taken to prevent damage to the evaporative cooling section during freezing
conditions. The sump, drain lines and supply lines must be drained prior to freezing conditions or an
alternate method must be used to protect the lines and media.
Step 1 Install the Water Supply Line
Connect the water supply line to the float valve in the
evaporative cooling unit. Install a manual shutoff
valve in the supply line as shown above. Refer to
figure #24.
Step 2 Install the Drain Line
Connect an unobstructed drain line with a manual
shut-off valve from the sump overflow to the main
drain line as shown above. A trap should be used to
prevent sewer gas from being drawn into the unit. See
figure #24 and #25.
Step 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.
Drain Line
Valve
Drain
Line
Figure 24. Recirculating Evaporative Piping
IMPORTANT!
IMPORTANT!
CAUTION!
Trap
freezing.
Figure 25. Drain Trap
12
Supply
Line
Supply Line
Valve
Overflow
6 in. min.
6 in. min.