WATER CONTROL OPTIONS FOR EVAPORATIVE COOLING

Auto Drain and Fill with Freeze Protection

This system will automatically drain the sump tank and fill it with fresh water at the field adjustable intervals, typically once every 24 hours. This flushes mineral build-up and debris from the tank to promote low maintenance and increase media pad life. In addition, the system will protect the evaporative cooler from freezing by draining the sump tank and supply line when the outside temperatures fall below the set point of the outside air sensor. Typically, this is set at 45º to 50º F. The auto drain and fill control box should be installed in an area that is shaded from direct sunlight so the outside air sensor probe will detect an accurate air temperature.

Plumbing (see FIGURE 9)

1.Run water supply line to the unit and install Water Supply Solenoid Valve (A) in this line as close to the water source as possible.

2.Install Drain Solenoid Valve (B) in the supply line as indicated below. From the outlet on the drain valve, run line to a suitable drain location.

3.Run an unobstructed drain line from the sump overflow to the drain as shown below.

4.Install Sump Drain Solenoid Valve (C) in the drain line from the sump as indicated below. From the outlet on this drain valve, run a line to a suitable drain location.

Note: Water Supply Solenoid Valve

(A)is not the same as the Drain Solenoid valves (B) and

(C).Make sure to use the proper valve for each location. Check your local code requirements for proper installation of this type of system. Additional drain and supply plumbing may be needed to meet your local code.

Caution: All solenoid valves A, B, and C must be installed below the roof to protect the supply water line from freezing. If these valves cannot be installed below the roof, an alternate method must be used to protect these lines from freezing.

Side of HRE Unit

 

Sump Drain Pipe

Evaporative

 

 

Cooling

Sump Overflow Pipe

Media

 

Sump

 

Roof Curb

Roof Line

Sump Drain

Solenoid

Valve (C)

 

Water Supply

 

Solenoid Valve (A)

 

Drain

 

Solenoid

Trap

Valve (B)

Supply Line

Drain

Line

8

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Greenheck Fan HRE-20, HRE-90, HRE-45, HRE-55 manual Water Control Options for Evaporative Cooling
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HRE-55, HRE-45, HRE-90, HRE-20 specifications

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