Model IGX Make-Up Air
21
®
Installation
Piping
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)
Optional Evaporative Cooling Module
Recirculating Pump
Supply Line
Overflow
Trap
Drain Line
Field-Supplied
Supply Line Valve
Field-Supplied
Drain Line Valve
All three solenoid valves are different. Make sure to use
the proper solenoid for each location. Check your local
code requirements for proper installation of this type of
system.
Note: The valves can be provided by the factory or
field-supplied by others. If field-supplied valves are
utilized, the total inrush VA shall not exceed 160 VA
and the total holding VA shall not exceed 66 VA with a
24 VAC supply.
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.
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.
Single Pass
Sump Overflow
Trap
Drain Line
Sump Drain
Supply Line
VALVE A
Supply Solenoid
(normally closed)
VALVE B
Supply Line Drain Solenoid
(normally open)
Mfg.
Part
Number
ASCO
Part
Number
Solenoid
Type
De-
Energized
Position
Diameter
Qty.
461262
8210G2
Supply
Closed
1/2 inch
(13 mm)
1
461263
8262G262
Supply Line
Drain
Open
1/4 inch
(6 mm)
1
Part numbers subject to change.
Auto Drain & Fill Valves
(when provided by manufacturer)
Assm.
Number
Mfg.
Part
Number
ASCO
Part
Number
Solenoid
Type
De-Energized
Position
Diameter Qty.
852178
461262
8210G2
Supply
Closed
1/2 inch
(13 mm)
1
461263
8262G262
Supply
Line Drain
Open
1/4 inch
(6 mm)
1
461264
8210G35
Sump
Drain
Open
3/4 inch
(19.mm)
1
Part numbers subject to change.