Greenheck MSX (470658) - Manual (Page 10)

10 Modular Supply Make-Up Air Unit
®
Installation Evaporative Cooler Piping
(optional)
Recirculating Evaporative Piping
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.
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 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.
Supply
Line
Overflow
Trap
Drain Line Valve
(By Others)
Drain Line
Supply Line
Valve
(By Others)
6 in. min.
6 in. min.
Drain Trap
Auto Drain & Flush Valves
(When provided by Manufacturer)
Assembly
Number
Mfg
Part
Number
ASCO
Part
Number
Solenoid
Type
De-Energized
Position
Diameter Qty.
852178
461262 8210G2 Supply Closed
1/2 inch
(12.7 mm)
1
461263 8262G262
Supply
Line
Drain
Open
1/4 inch
(6.35 mm)
1
461264 8210G35
Sump
Drain
Open
3/4 inch
(19.05 mm)
1
Part numbers subject to change.
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.
Auto Drain & Fill 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 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 &
Fill Evaporative Piping drawing on previous 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.
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.
Drain Trap