Greenheck DG/DGX Pilot Ignition (470651_IOM) - Manual (Page 9)

Optional Vent Line
WARNING
NEVER test for a gas leak with an open flame.
NOTE
The factory piping has been checked for leaks,
but should be rechecked due to shipping and
installation.
WARNING
Reference the National Fuel Gas Code for additional
vent line requirements.
Installation Evaporative Cooler
Piping (optional)
IMPORTANT
All supply solenoids, valves and all traps must be below
the roof line or be otherwise protected from freezing.
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
Provisions must be taken to prevent damage to the
evaporative cooling section during freezing conditions.
The sump, drain lines and supply lines must be
drained prior to freezing conditions or an alternate
method must be used to protect the lines and media.
Evaporative Cooling with Recirculating Pump
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 a manual
shutoff valve in the supply line as shown above.
2. Install the Drain Line
Connect an unobstructed drain line to the drain and
overflow connections on the evaporative cooler.
A shut off valve (by others) is required for the
evaporative cooler drain line.
A trap should be
used to prevent
sewer gas from being
drawn into the unit.
Refer to drain trap
diagram.
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.
Recirculating Evaporative Piping
6 in. min.
6 in. min.
Drain
Trap
5. Test the System for Leaks
Check both the supply lines and the factory piping
for leaks. Apply a soap and water solution or other
approved leak test solution to all piping and watch for
bubbling which indicates a leak.
4. Pipe the Optional Vent Line
If an optional vent line is located between the safety
shutoff valves, it must be piped to the outdoors.
Vent Line Solenoid
Safety Shut-Off Valves
to burner
to outdoors
from supply
Vent Line
Supply Line
Overflow
Trap
Drain Line
Supply Line Valve
(normally closed) Drain Line Valve
(normally open)
Model DG / DGX Pilot Ignition Make-Up Air 9
®