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

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 outdoor air sensor should be installed in an area that is shaded from direct sunlight so the outside air sensor probe will detect an accurate air temperature. Set the timer. Timer settings are t1:1.0, 10 min and t2:0.4, 60h

PLUMBING FOR AUTO DRAIN AND FILL

Temperature

Setting

t2 settings

t1 settings

EvaporativeEvaporative

FreezeTimer

Protection

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 trap 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..

	VB	1/4 PIPE SIZE (NO)
SIDE OF HRE UNIT
SUMP DRAIN PIPE	VC	VALVE "C"
		3/4 PIPE SIZE (NO)
(TO EACH EVAP)
SUMP OVERFLOW PIPE	EVAPORATIVE
(TO EACH EVAP)
	COOLING MEDIA

SUMP

WATER LINE CONNECTION

AT FLOAT IS 1/4 INCH

ROOF CURB

ROOF LINE

SUMP DRAIN SOLENOID VALVE (C)–NORMALLY OPEN 3/4 INCH PIPE SIZE

WATER SUPPLY SOLENOID VALVE (A)–NORMALLY CLOSED 1/2 INCH PIPE SIZE

TRAP

DRAIN LINE

DRAIN SOLENOID VALVE (B)–NORMALLY OPEN 1/4 INCH PIPE SIZE

SUPPLY LINE

Trap & Supply Line Configuration with Auto Drain and Fill

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