Trane Performance Air Handlers Manual de instalación descargar pdf (Pagina 58)

100

58 CAH-SVX01B-EN

Coil Piping and Connections

Note: Trane steam coils require a minimum of 2 psi of pressure to ensure even heat distribution.

2. Trap each coil separately to prevent holding up condensate in one or more of the coils.

3. Install strainers as close as possible to the inlet side of the trap.

4. If installing coils in series airflow, control each coil bank independently with an automatic

steam-control valve. Size the traps for each coil using the capacity of the first coil in direction

of airflow.

5. Use a modulating valve that has linear flow characteristics to obtain gradual modulation of the

coil steam supply.

Note: Do not modulate systems with overhead or pressurized returns unless the condensate is

drained by gravity into a receiver, vented to atmosphere, and returned to the condensate

pump.

6. Pitch all supply and return steam piping down 1 inch for every 10 feet in the direction of the

steam or condensate flow.

Note: Do not drain the steam mains or take-offs through the coils. Drain the mains ahead of the

coils through a steam trap to the return line.

7. Ensure overhead returns have 1 psig of pressure at the steam trap discharge for every 2 feet

of elevation for continuous condensate removal.

Water Coil Piping

Figure 54, Figure 55, and Figure 56

illustrate typical water coil piping

configurations.

Type WA, 5A, 5W, D, K, W, UW, TT, P,2,

P4, and P8 water coils are self-venting

only if the water velocity exceeds

1.5 feet per second (fps) in the coil

tubes. Type UU, WD, and 5D water coils

are self-venting only if the water

velocity exceeds 2.5 fps in the coil

tubes. See the unit submittals for coil

water velocity. If the water velocity is

below these minimums, vent the coil by

one of the following methods:

1. Install an air vent in the top pipe

plug tapping of the return header.

2. When the return line rises above the

top of the coil, vent from the top of

the return header horizontally to the

return piping.

Note: T, ST, and TT coils are designed

with larger than normal end

tube sheet holes to allow for

maximum expansion. Air

leakage around tubes should be

expected and handled by

capping over coil ends or by

sealing around tubes with a

pliable sealant such as silicon.

Figure 54. Typical piping for type 5W one-row water coil

Figure 55. Typical piping for type 5A, 5W two-row, K, W 3- to 12-row, WD, D,

and DD water coils

Water supply

main

Water

return main

Drain

Level

Air flow

Water supply

main

Water

return main

Drain

Air flow

Pitch down

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Trane Performance Air Handlers Manual de instalación Pagina 58

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