Greenheck Fan Make-Up Air Unit 470658 MSX - Manual (Page 10)

10
®
Model MSX Make-Up Air
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.
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
(Normally Open)
Drain Line
Supply
Line Valve
(Normally
Closed)
Recirculating Evaporative Piping
6 in. min.
6 in. min.
Drain Trap
Evaporative Cooling with Auto Drain and Fill
Auto Drain & Flush Valves
(When provided by Greenheck)
Assembly
Number
GFC
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
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
Trap