SECTION 3 - HANDLING, STORAGE, AND INSTALLATION
PACE
│
Installation & Assembly Manual
Issue Date: 07/03/2018
88
Form PA102.20-N1
COIL PIPING
Do not test, clean and flush piping
through this equipment.
Isolate this equipment from pressure
testing of water, steam gas and air pip-
ing.
1. Consult the job specifications and submittal draw-
ings for specific piping requirements, coil connec-
tion sizes and location. The AHU should be level
to assure proper venting and draining of coils.
The piping arrangements must provide for a bal-
anced flow in multiple coil installations as shown
in
Figure 145 -
Factory Coil Connections
LD06340
STEAM IN
CONDENSATE
OUT
SAME END
CONN
OPPOSITE
END CONN
SDC COIL
AIR
FLOW
2. Support all connecting piping independently of
the coils. Provide swing joints or flexible fittings
in all piping connections, particularly adjacent to
heating coils to absorb expansion and contrac-
tion strains because rigid piping connections can
cause coil damage.
3. The coil supply and the return pipe connections
are labeled. When attaching the piping to the coil
header, make the connection only tight enough
to prevent leaks. Excessive tightening may cause
damage to the header.
Hold a backup wrench firmly on the coil connec-
tion so that when tightening the connecting pip-
ing, the torque is not transmitted to the coil head-
er, which could damage the coil connection.
Application Notes
All connections are male piping threaded except DX
coils, which are soldered. Drain and vent taps on water
coils are pipe thread, and shipped with plugs installed.
These taps are installed approximately two in. back
from the end of the threaded connections. Install the
pipe for balanced flow and to assure even airflow.
Staggered Coils
Staggered coils in the AHUs equipped with an optional
expanded cabinet will have connections brought to the
AHU exterior for liquid or steam coils as shown in
and
DX coils are not included.
The external connections are a threaded pipe or
grooved pipe for the contractor to make his connec-
tions when the media is liquid, or a threaded pipe when
the media is steam.
Coil Leak Test Required: Due to the
factory mechanical (Victaulic) connec-
tion at the inset coil, a leak test must be
performed after equipment is installed.
Failure to leak test the mechanical con-
nection could result in water leaks and
damage.
It's the installing contractor's responsibility to insulate
the piping extensions inside the AHU.
Figure 146 -
Staggered Coil - Angled Wall
LD16561
