Greenheck DG Installation, Operation And Maintenance Manual page 10

Installation Evaporative Cooler
Piping (optional)
Evaporative Cooling with Auto Drain and Fill
Supply Line
Sump Overflow
Sump Drain
VALVE C
Sump Drain Solenoid
(normally open)
VALVE B
Supply Line Drain Solenoid
(normally open)
Auto Drain and Fill Evaporative Piping
IMPORTANT
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.
CAUTION
All solenoid valves and traps must be installed
below the roof to protect the supply water line from
freezing. If they cannot be installed below the roof, an
alternative method must be used to protect the lines
from freezing.
IMPORTANT
The supply solenoid (Valve A) is NOT the same as the
drain solenoids (Valve B and Valve C). Make sure to
use the proper solenoid for each location. Check your
local code requirements for proper installation of this
type of system.
Auto Drain & Flush Valves
(when provided by manufacturer)
Mfg. ASCO
Assm. Solenoid
Part Part
Number
Number Number
461262 8210G2
852178 461263 8262G262
461264 8210G35
Part numbers subject to change.
10 Direct Spark Ignition Make-Up Air
continued
VALVE A
Supply Solenoid
(normally closed)
Trap
Drain Line
De-Energized
Diameter
Type Position
1/2 inch
Supply Closed
(12.7 mm)
Supply
1/4 inch
Line Open
(6.35 mm)
Drain
Sump 3/4 inch
Open
Drain (19.05 mm)
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 and Fill Evaporative Piping drawing shown on this
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. Refer to drain
trap drawing.
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.
Qty.
1
1
1
6 in. min.
Drain
6 in. min.
Trap
®