Air-Drying Method Of Coil Protection; Coil Removal; Removal Of Single Height Coils (Sizes 03-36); Removal Of Stacked Coils (Sizes 40 To 110) - Carrier Aero 39MN Series Installation, Start-Up And Service Instructions Manual

7. Remove upper line from reservoir to reversible pump.
Drain coil to reservoir and then close service valve.
8. Break union and remove reservoir and its lines.
9. Leave coil flanges or coupling open and auxiliary drain
valves open until spring.

AIR-DRYING METHOD OF COIL PROTECTION

(Unit and coil must be level for this method.)
1. Close coil water supply and return main valves.
2. Drain coil as described in procedures for Antifreeze
Methods of Coil Protection, preceding.
3. Connect air supply or air blower to inlet header connec-
tion and close its drain connection.
4. Circulate air and check for air-dryness by holding mirror
in front of open vent in outlet header drain connection.
Mirror will fog if water is still present.
5. Allow coil to stand for a few minutes; repeat Step 4 until
coil is dry.

Coil Removal

NOTE: To reinstall coils, refer to Coil Installation section on
page 124.

REMOVAL OF SINGLE HEIGHT COILS (SIZES 03-36)

The coils in horizontal coil sections must be removed from either
side of the unit. Once the external panels are removed from the
unit, the horizontal upper coil section frame members are easily
removable from the framework to allow hoisting the coil up and
out of the unit.
NOTE: Refer to Table 20 on page 60, (Dry Coil Weights)
before attempting to remove a coil from the unit.
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 up-
stream service panel and set aside in a safe place.
3. a. On horizontal coil sections without another unit sec-
tion stacked on top, 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.
c. Set screws aside for re-installation of top rail.)
d. Remove the top rail by pulling out at a 45-degree
angle. Set top rail aside.
IMPORTANT: Properly support the coil to assure its stability
before continuing with this procedure.
4. Remove the fastening screws from the upstream perime-
ter face of the coil that attach the coil to the coil baffles.
This may require reaching through an opened damper as-
sembly, reaching through a filter track after filters are re-
moved, or removing a coil immediately upstream.
CAUTION
Do not handle the coil by the headers or connection nipples, as
irreparable damage might occur that is NOT covered by war-
ranty. Protect the finned surface from damage during all han-
dling and shipping.
5. Slip the foam sealing sleeves off the connection nipples
before removing the coil and set the sleeves aside.
6. The coil may now be hoisted out through the top opening
or carefully slid out either side of the cabinet. Sections
where the top frame rail cannot be removed may require
slightly tipping of the coil from the vertical position, to
clear the upper frame rail and seal.

REMOVAL OF STACKED COILS (SIZES 40 TO 110)

The coils in horizontal coil sections must be removed from either
side of the unit. Once the external panels are removed from the
unit, the horizontal upper coil section frame members are easily
removable from the framework, to allow hoisting the coil up and
out of the unit.
1. Lock open and tag all power supplies to unit fan motor
and electric heaters if present.
2. a. Remove service panel/coil connection panel and the
upstream service panel and set aside in a safe place.
b. Remove the top rail by pulling out at a 45-degree
angle. Set top rail aside.
3. a. On horizontal coil sections without another unit sec-
tion stacked on top, 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 top rail.)
c. Remove the top rail by pulling out at a 45-degree
angle. Set top rail aside.
IMPORTANT: Properly support the coil to assure its stability
before continuing with this procedure.
4. Remove the fastening screws of the uppermost coil from
the upstream side. Note that the fastening screws pass
through the vertical angle, baffles, and coil casing. See
Fig. 195. Removal of the fastening screws may require
reaching through an opened damper assembly, reaching
through a filter track after filters are removed, or remov-
ing a coil immediately upstream.
Do not handle the coil by the headers or connection nipples, as
irreparable damage might occur that is NOT covered by war-
ranty. Protect the finned surface from damage during all han-
dling and shipping.
5. Slip the foam sealing sleeves off the connection nipples
before removing the coil and set the sleeves aside.
6. The upper coil may now be hoisted out through the top
opening, or carefully slid out either side of the cabinet.
Sections where the top frame rail cannot be removed may
require slightly tipping of the coil from the vertical posi-
tion, to clear the upper frame rail and seal.
7. On the upstream side of the stacked coils, remove and
set aside the center baffle spanning the two coils (see Fig.
195).
8. For sections that do not have a drain pan (heating only
sections), remove the three hat channel spacer supports
fastened to the top of the lower coil, and set aside.
9. For sections that do have a drain pan, remove the two hat
channel spacer supports from the bottom of the coil sec-
tion and set aside.
10. Remove the intermediate condensate drain pan.
11. Remove the spacer (hat channel) secured to the top center
of the lower coil casing (see Fig. 196) and set aside.
209
CAUTION