Installation, Operating & Maintenance Manual
13
1.4 Steam distribution
1.4.1 Duct injection
If you are using stainless steel duct steam distributor pipes:
They must be mounted completely level in the duct with the steam outlet holes facing up as shown above.
Support the end of longer distributor pipes if needed. Generally the distributor pipes should be mounted in the
center of the air stream with a minimum of 6” from the center of the distributor pipe to the top of the duct and 3”
minimum to the bottom. In vertical ducts, the distributor pipes are mounted in the center with the holes facing
up. The airflow may be up or down, but when the airflow is down, maximum velocity is 1,500 fpm. Note: end
support bracket is only supplied with distributors of 36” and larger length.
To install the stainless steel distributor pipes:
1. Cut a key shaped hole in the side of the duct to match the steam pipe and condensate return as
shown at right.
2. Apply silicone sealant to the mounting plate and insert the pipe through the hole and secure it with 4
sheet metal screws.
3. Connect the steam and condensate hoses using the hose clamps supplied.
If you are using the duct kit, it includes the SDPOEM22 plastic steam distribution nozzle:
As with the stainless steel distributors, cut a hole in the duct to match the insertion part, apply silicon sealant to
the duct mounting plate, fasten with 4 sheet metal screws and connect the steam hose and condensate lines
using the hose clamps provided.
NOTE: The SDPOEM accommodates both the 22mm I.D. hose and the 30mm I.D. hose. If you are using the
30mm I.D. steam hose, you should cut off the smaller steam inlet at the cut line shown above.
IMPORTANT: Allow 2 feet of straight duct downstream of the distributor pipes when the air temperature
will be >55
o
F. Allow 3 feet of straight duct if the air temperature will be <50
o
F. Always allow 2 feet
upstream. Turbulent air flow may require longer lengths.
(101 pages)
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