Evaporative Cooler - Greenheck ERCH-20 Installation, Operation And Maintenance Manual

Optional Evaporative Cooler
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 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.
Recirculating Pump
This option includes a pump that recirculates water over
the evaporative media. The pump is activated by a call
for cooling. A field-adjustable bleed-off valve keeps
mineral concentrations low.
Drain Line Valve
(Normally Open)
Drain Line
Recirculating Evaporative Piping
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 manual shut off valve
(by others) is
required for the
evaporative
cooler drain line.
A trap should be
used to prevent
Drain Trap
sewer gas from
being drawn into the unit.
®
Supply
Line
Supply Line Valve
(Normally Closed)
Overflow
Trap
6 in. min.
6 in. min.
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.
Auto Drain and Flush
This option includes a recirculating pump and field-
adjustable timer that will periodically flush the sump to
keep mineral concentrations low.
Sump Drain
VALVE C
Sump Drain Solenoid
(Normally Open)
VALVE B
Supply Line Drain Solenoid
(Normally Open)
Auto Drain & Flush Evaporative Piping
CAUTION
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.
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-inch normally
closed solenoid (Valve A) in the supply line. Install the
1/4-inch normally open solenoid (Valve B) between
the supply line and the drain line.
2. Install the Drain Line. Connect an unobstructed
drain line to the sump drain overflow connection.
Install the 3/4-inch normally open solenoid (Valve C)
between the
sump drain
connection and
the drain line. A
trap should be
used to prevent
Drain Trap
sewer gas from
being drawn into the unit.
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.
Energy Recovery Ventilator with Heating and Cooling General Description - NOT model specific
Supply
Sump Overflow Line
VALVE A
Supply Solenoid
(Normally Closed)
Trap
Drain Line
6 in. min.
6 in. min.
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