Installation Of Stacked Coils - Carrier Aero 39MN Series Installation, Start-Up And Service Instructions Manual

require slightly tipping the coil from the vertical position in
order to clear the upper frame rail and seal, which is not read-
ily removed.
6. Loosely secure the coil at the top using the
hoisting holes located in the side channel/tube sheet juncture
at each end.
7. Install the first coil in the section. Access the upstream face of
the coil and install the screws holding the coil to the mounting
baffles around the entire perimeter. This may require reaching
through an opened damper assembly or through the filter
track after filters are removed.
8. Replace the top rail by reinstalling the Torx T25 screws and
flat corner plugs.
9. Replace all service panels.

INSTALLATION OF STACKED COILS

(Medium Face Area Coils: 35T, 37T, 42T, and 51T to 110W —
Large Face Area Coils: 16T, 18T, 22T, 25T, 30T, 35T, and 37T to
110W)
IMPORTANT: The lengths of the coil supports and
intermediate pans and channels are designed to work with
Carrier coils. Substitution of other manufacturer's coils may
require that custom mounting components be field fabricated.
Coil sections ordered without coils will come with the
referenced parts in kit form.
NOTE: The length that the intermediate drain pan extends
downstream from the coil face has been designed for use with
Carrier manufactured coils, and may prove insufficient for
other makers' coils.
1. Lock open and tag all power supplies to unit fan motor and
electric heaters if present.
2. Remove service panel/coil connection panel and the upstream
service panel and set aside in a safe place.
3. a. Remove the flat corner plug from each end piece of the
top rail.
b. Extract the Torx T25 screw visible within the exposed
cavity. (Do not mix these screws with others; they are
specific for this location. Set screws aside for re-
installation of the top rail.)
c. Remove the top rail by pulling out at a 45-degree
angle. Set top rail aside.
CAUTION
Do not handle the coil by the headers or connection nipples, as
irreparable damage might occur that is NOT covered by
warranty. Protect the finned surface from damage during all
handling and shipping.
4. Slip the foam sealing sleeves on the connection nipples
before installing the coil.
5. Before placing the coils inside the unit, apply the adhesive
backed gasket to the lower baffle, spanning the entire unit, on
the surface that will contact the coil (see Fig. 94).
/ -in. diameter 6. a. Place the lower coil on the coil supports, sliding the
3
8
b. Place the heavy vertical angle (which is full height of
c. Secure the lower side casing of the coil to the lower
7. For coil sections that do not have a drain pan within the sec-
tion, go to Step 10.
For 42T units and larger (both T and W units) with stacked
coils, the upper drain pan will have a double slope with drains
at either end. Secure the spacer (hot channel) to the top center
of the lower coil casings (see Fig. 86).
Do not penetrate through the coil casing into the fin pack.
Tube damage may occur.
For units smaller than 42T (both T and W units) with stacked
coils, the upper drain pan will have a single slope. Secure the
spacer (hot channel) to the end of the lower coil casing.
depending on which end the condensate will drain from.
NOTE: There will be an opening at either end of the pan for single
slope drain pans (see Fig. 93).
8. For a double slope drain pan, secure two spacers (hat chan-
nels) to each end of the bottom of the upper coil casing before
placing the coil in position (refer to Fig. 94). For single slope
drain pan secure spacer (hat channel) to achieve the intended
slope (left or right). See Fig. 95.
9. For single and double slope drain pans, place the intermediate
condensate drain pan on the lower coil, centering the drain
pan between the sides of the unit, with the condensate outlet
holes along the downstream edge. (It may be helpful to tem-
porarily secure the drain pan by a strip of double-stick tape on
the center hat channel.)
10. Lift the upper coil (with spacer hat channels on the bottom of
each end) into place, aligning the upper coil with the lower
coil. When the upper coil is lowered into place, it will deflect
the intermediate condensate pan downward on each end, pro-
viding for positive drainage.
11. Install factory-supplied screws around the ends and top of the
coil.
125
coil against the upstream baffle and aligning the
mounting holes so that the connection nipple will
extend approximately 3 in. outside the unit casing.
the finished coil bank) along the upstream right and
left side of the mounting baffles (see Fig. 94). Install
screws through this angle first and then into the baf-
fles, engaging the coil tube sheet mounting holes and
securing the coil within the unit.
horizontal baffle, sandwiching the gasket in between.
CAUTION