Water And Steam Coil Piping; Recommendations - Carrier Aero 39MN Series Installation, Start-Up And Service Instructions Manual

CHANNEL, HAT
Fig. 87 — Secure Spacer
13. On the upstream side of the stacked coils, attach the
center baffle (see Fig. 86), 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 casings.
14. Install the drain fittings into the pan. Route and secure
the hoses as shown in Fig. 88.
15. 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.
16. 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 cas-
ing. See Fig. 86.
ATTACHED TO COIL
TUBE SHEET
Fig. 88 — Install Drain Fittings
Water and Steam Coil Piping Recommenda-
tions
GENERAL — Use straps around the coil casing or the lifting
holes (see Fig. 89) 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 connec-
tions independently. Do not use the coil connections to sup-
port piping. When tightening coil connections, use a backup
wrench on the nozzles.
ATTACH WITH 4 SCREWS
TO COIL CASING
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DRAIN
CONDENSATE PAN
GASKET
WASHER
NUT
HOSE CLAMP
HOSE
NOTE: Verify that all vents and drains are capped or
plugged before allowing water or steam flow through any
coil. See Fig. 89.
Piping practices are outlined in the Carrier System Design
Manual, Part 3, Piping Design.
WATER COILS — Typically, coils are piped by connect-
ing the supply at the bottom and the return at the top. See
Fig. 89. 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. 89 — Coil Connections and Lifting Points
123
AIRFLOW
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