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CHANNEL, HAT
Fig. 95 — Secure Spacer
12. On the upstream side of the stacked coils, attach the center
baffle (see Fig. 94), spanning the two coils with the crease in
the baffle away from the coils, centering it between the side
baffles, and aligning the baffle with the holes in the coil cas-
ings.
13. Install the drain fittings into the pan. Route and secure the
hoses as shown in Fig. 96.
14. For sections that do not have a drain pan (heating only
sections):
a. After the lower coil has been secured in position, fasten
the three hat channel spacer supports to the top of the
coil.
b. Place the upper coil into position directly above the
lower coil, resting on these hat channels.
15. Secure the uppermost coil from the upstream side, so that the
fastening screws provided pass through the vertical angle and
the baffles and engage the coil casing. See Fig. 94.
ATTACHED TO COIL
TUBE SHEET
Fig. 96 — Install Drain Fittings
Water and Steam Coil Piping Recommendations
GENERAL
Use straps around the coil casing or the lifting holes (see Fig. 97)
to lift and place the coil.
CAUTION
To prevent damage to the coil or coil headers: Do not use the
headers to lift the coil. Support the piping and coil connections
independently. Do not use the coil connections to support
piping. When tightening coil connections, use a backup
wrench on the nozzles.
ATTACH WITH 4 SCREWS
TO COIL CASING
a39-2911ef
DRAIN
CONDENSATE PAN
GASKET
WASHER
NUT
HOSE CLAMP
HOSE
NOTE: Verify that all vents and drains are capped or plugged be-
fore allowing water or steam flow through any coil. See Fig. 97.
Piping practices are outlined in the Carrier System Design Manu-
al, Part 3, Piping Design.
WATER COILS
Typically, coils are piped by connecting the supply at the bottom
and the return at the top. See Fig. 97. This is not always the case,
especially if the coil hand has been changed in the field. Coils
must be piped for counterflow; otherwise, a capacity reduction of
5% for each coil row will result. To ensure counterflow, chilled
water coils are piped so that the coldest water meets the coldest air.
Hot water coils are piped so that the warmest water meets the
warmest air.
VENT
RETURN
SUPPLY
DRAIN
INTEGRAL FACE AND BYPASS COIL SHOWN
1/2 IN. WATER COIL SHOWN
Fig. 97 — Coil Connections and Lifting Points
134
AIRFLOW
a39-4341
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