175244-BIM-A-0706
Unitary Products Group
19
OPTIONAL RECLAIM COIL PIPING CONNECTION
Remove the left front corner panel to provide access to
the reclaim coil connections (See Figure 13).
Remove the sheetmetal patch plates attached to the
base pan located beneath the reclaim coil stub-outs.
Reinstall the two-hole patch plate at the same location
using seal screws. The solid patch plate can be used
as a heat shield during subsequent brazing operations,
if needed; otherwise it can be discarded.
The reclaim coil is checked for leaks at the factory and
shipped with a holding charge of nitrogen. Before
installing connections to the reclaim coil, be sure the
coil has not developed a leak in transit by attaching a
pressure gauge to one of the service valves located on
the stub-outs. If the reclaim coil has maintained its
holding charge, the coil can be considered to be leak-
free. If the coil has lost its holding charge, the reclaim
coil must be leak-tested and any necessary repairs
made before proceeding.
The temperature required to make or break a brazed
joint is sufficient to cause oxidation of copper unless an
inert gas such as nitrogen is provided. Drill a small hole
through the end of one of the stub-out’s endcaps to
release the nitrogen holding charge and enable a free
flow of nitrogen. Connect a supply of dry nitrogen
through a reducing regulator to the service port of the
opposite stub-out to allow for a continuous flow of nitro-
gen to all copper joints to be brazed.
After unbrazing and removal of the end caps, install
short-radius ells at the end of the coil stub-outs to
insure proper piping alignment with the access open-
ings in the base pan patch plate. Braze all copper-to-
copper joints with Silfos-5 or equivalent brazing mate-
rial. Do not use soft solder. The use of hard-drawn cop-
per tubing is recommended to complete the piping
connections to the reclaim coil by passing them
through the rubber grommets of the patchplate.
