Greenheck TSU Base Unit Manual (464441) - Manual (Page 9)

Make-Up Air Unit 9
®
Auto Drain & Flush Valves
(when provided by Manufacturer)
Assm.
Number
Mfg.
Part
Number
ASCO
Part Num-
ber
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 solenoid 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.
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 and Fill Evaporative Piping drawing shown on this
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
water from
overflowing the
sump pump. 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 and drain pipe as needed to
achieve the proper water level.
6 in. min.
6 in. min.
Drain
Trap
Auto Drain and Fill Evaporative Piping
Installation Evaporative Cooler
Piping (optional)
continued
Evaporative Cooling with Auto Drain and Fill
Sump Overflow
Trap
Drain Line
Sump Drain
Supply Line
VALVE A
Supply Solenoid
(normally closed)
VALVE C
Sump Drain Solenoid
(normally open)
VALVE B
Supply Line Drain Solenoid
(normally open)