Des Champs Technologies | 2 Nikki Lane | Natural Bridge Station, VA 24579
| Ph: 540-228-1967
Page | 2
Rev: 12/20
Installation
.
For positive pressure cooling section(s), always
connect the drain pan directly to a trap to ensure
proper drainage of water while simultaneously
preventing escape of air from the unit.
Important: Install
a strainer screen, as shown in
Figure 1
, over the drain inlet prior to operation of the
HVAC unit and before installing the trap.
An integral
Union-Strainer™( see Figure 8)
may also be
inserted in the drain line upstream of the
Air-Trap.
1. Install the P-SERIES
Air-Trap
vertically with the
end marked “top” facing upward and the
embossed arrowhead, ,
pointing downward. This
is a requirement for proper movement of the
internal float valve component.
2. Install the trap in accordance with manufacturer’s
instructions and with all applicable local or national
plumbing, drainage, and mechanical codes.
3.
NEVER CONNECT CONDENSATE DRAIN
DIRECTLY TO A SANITARY DRAIN LINE.
Connect only to a storm drain or a condensate
drain line.
Operation
The P-SERIES
Air-Trap
operates dry when no water
removal is required and wet when it is required. When
dry, essentially no air exits the HVAC unit. When
removing water, the water exits the unit, but essentially
no air exits the unit through the drain connection.
Install the P-SERIES
Air-Trap
in a vertical orientation.
With no production of condensate within the AHU the
positive pressure that exists within the plenum that
contains the drain line forces the capsule (or
spherocylinder), downward onto the valve seat. With
the production of water within the plenum, the capsule
rises from the seat when the net buoyancy force
upward equals or exceeds the net downward force
created by air pressure. See cutaway view in
Figure
3
.
The standard model P-SERIES operates as a
positive trap up to 12 inches WG of positive pressure.
If a pressure of more than 12 inches WG could occur,
then please contact Des Champs Technologies for
information on the Engineered P-Series
Air-Trap
.
The P-SERIES
Air-Trap
accomplishes the following:
•
Reduces sludge buildup that normally
accumulates in standard “P” traps
•
Prevents freezing of trap during cold periods
since during periods of no water removal there
is no water in the trap. If, for some reason,
water is flowing from the unit during freezing
temperatures, and the trap is located within this
freezing temperature region, then the trap will
require thermal protection.
•
P-Series
Air-Trap
requires no water head to
cause the trap to operate. Simply come out of
the plenum with the condensate line and go
down into the P-Series
Air-Trap
. Come out of
the trap and go horizontally with your drain line.
The height, x, requirement then becomes the
height of the trap plus two street elbows
.
See
Figure 2.
•
Eliminates air escaping from an HVAC unit that
would result from a standard P-trap
experiencing a “dry-out” condition.
•
Note: If there is a possibility of a syphoning
effect (suction pressure) at the exit point of the
Air-Trap
then it is necessary to install a vent as
close as possible to the bottom of the trap (see
Figure 9
).
•
If height, x, is an issue, the P-Series
Air-Trap
may be installed at a 45° angle, as shown in
Figure 5
. When installed at a 45° angle, the
maximum positive pressure it can withstand is
5” of WG instead of 12”. The reduced pressure
capability is a result of a reduction in buoyancy.
•
Another option when height is an issue is to
install the N-Series
Air-Trap
vertically, as
opposed to horizontally when used as a
negative trap, shown in
Figure 6.
The
maximum positive plenum pressure it
CAUTION
Failure to provide adequate
drainage piping may result in
water damage to equipment or
building.
Place stainless steel filter
screen, Figure 1 over drain
inlet
or install a
Union-Strainer™, see Fig 8,
upstream of the trap.
Figure 1 Strainer Screen
Figure 2: P-Series
Air-
Trap
Installed
