Water Control Options - Greenheck HRE-20 Installation, operationand Maintenance Manual

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
THE FOLLOWING COMPONENTS SHIP FROM GREENHECK WITH HRE (INSTALLATION, WIRING, AND POWER BY OTHERS)
promote low maintenance and increase media pad life . In addition,
PART DESCRIPTIONS
the system will protect the evaporative cooler from freezing
by draining the sump tank and supply line when the outside
JOHNSON CONTROLLER
temperatures fall below the set point of the outside air sensor .
OUTDOOR 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
24 HOUR TIMER
sunlight so the outside air sensor probe will detect an accurate air
VALVE, WATER SUPPLY (A)
temperature. Set the timer. Timer settings are t1:1.0, 10 min and
VALVE, DRAIN (B)
t2:0.4, 60h
VALVE, SUMP DRAIN (C)
PLUMBING FOR AUTO DRAIN AND FILL
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 .
JC
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
NC COM
lines from freezing .
SIDE OF HRE UNIT
SUMP DRAIN PIPE
(TO EACH EVAP)
SUMP OVERFLOW PIPE
(TO EACH EVAP)
TRAP
DRAIN SOLENOID VALVE (B)–NORMALLY OPEN
DRAIN LINE
12
AUTO DRAIN AND FILL WITH FREEZE PROTECTION
GREENHECK P/N
07458032
07458298
07381940
05461262
05461263
05461264
24V AC POWER AND WIRING
BY OTHERS
24VAC SENSOR
JOHNSON CONTROLLER
JC
15
TIMER
B1
T1
A1
EVAPORATIVE
COOLING MEDIA
ROOF CURB
SUMP DRAIN SOLENOID VALVE (C)–NORMALLY OPEN
3/4 INCH PIPE SIZE
1/4 INCH PIPE SIZE
SUPPLY LINE
QTY. HOLDING VA
1 -
1 -
1 -
1 25
1 25
1 25
OUTDOOR AIR
SENSOR
COM
A2
16
18
VA
VB
VC
SUMP
ROOF LINE
WATER SUPPLY SOLENOID VALVE (A)–NORMALLY CLOSED
1/2 INCH PIPE SIZE
Trap & Supply Line Configuration
with Auto Drain and Fill
Temperature
Setting
t2 settings
INRUSH VA
t1 settings
-
-
-
Evaporative
70
Freeze
50
Protection
70
OUTDOOR AIR SENSOR
TIMER
VALVE "A"
1/2 PIPE SIZE (NC)
VALVE "B"
1/4 PIPE SIZE (NO)
VALVE "C"
3/4 PIPE SIZE (NO)
WATER LINE CONNECTION
AT FLOAT IS 1/4 INCH
Evaporative
Timer