Carrier 39LH Installation, Start-Up And Service Instructions Manual page 23

NOTES:
1. Flange or union is located to facilitate coil removal.
2. Flash trap may be used if pressure differential between steam
and condensate return exceeds 5 psi.
3. When a bypass with control is required.
4. Dirt leg may be replaced with a strainer. If so, tee on drop can
be replaced by a reducing ell.
5. The petcock is not necessary with a bucket trap or any trap
which has provision for passing air. The great majority of high
or medium pressure returns end in hot wells or deaerators
which vent the air.
Fig. 26 — Low, Medium or
High Pressure Coil Piping
NOTES:
1. A bypass is necessary around trap and valves when continu-
ous operation is necessary.
2. Bypass to be the same size as trap orifice but never less than
1 / inch.
2
Fig. 27 — Dripping Steam Supply to
Condensate Return
27
NOTES:
1. Flange or union is located to facilitate coil removal.
2. When a bypass with control is required.
3. Flash trap can be used if pressure differential between supply
and condensate return exceeds 5 psi.
4. Coils with different pressure drops require individual traps. This
is often caused by varying air velocities across the coil bank.
5. Dirt leg may be replaced with a strainer. If so, tee on drop can
be replaced by a reducing ell.
6. The petcock is not necessary with a bucket trap or any trap
which has provision for passing air. The great majority of high
pressure return mains terminate in hot wells or deaerators
which vent the air.
Fig. 28 — Multiple Coil High Pressure Piping
23
27