Greenheck DG / DGX with Pilot Ignition (463555 IOM) (Pre-2008) - Manual (Page 13)

13
Installation - Evaporative Cooler Piping (Optional)
Installation
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 solenoids 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.
Step 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 as shown above. Install the 1/4 in. normally open solenoid
(Valve B) between the supply line and the drain line as shown above.
Step 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 piping drawing above.
Evaporative Cooling with Auto Drain and Fill
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.
6 in. min.
6 in. min.
Auto Drain & Flush Valves (when provided by Greenheck)
Assembly
Number
GFC
Part Number
ASCO
Part Number
Solenoid Type
De-Energized
Position
Diameter Quantity
852178
461262 8210G2 Supply Closed 1/2 inch 1
461263 8262G62 Supply Line Drain Open 1/4 inch 1
461264 8210G35 Sump Drain Open 3/4 inch 1
Auto Drain & Fill Evaporative Piping
Drain Trap
Supply Line
VALVE B
Supply Line Drain Solenoid
(Normally Open)
Sump Overflow
Sump Drain
VALVE C
Sump Drain Solenoid
(Normally Open)
VALVE A
Supply Solenoid
(Normally Closed)
Drain Line
Part numbers subject to change.