I n s t a l l a t i o n , O p e r a t i o n , & M a i n t e n a n c e M a n u a l
8
www.herrmidifier-hvac.com
Distributor Mounting Instructions
Sheetmetal Duct:
Make a 1-1/4” hole in the duct at desired location. Insert duct
distributor and secure with self tapping sheetmetal screws
(supplied by others).
Fiberboard Duct:
Make a 1-1/4” hole in the duct at desired location. Insert duct
distributor and mark the four holes on flange. Drill holes at
marked locations. Fasten distributor with bolts (supplied by
others).
Steam Distribution
HERRMIDIFIER supplies a stainless steel duct distributor for
injecting pure steam into the duct. This can be installed in the side
(recommended) or the bottom (alternate) of the duct. (See Figure
5.) When installing in the side of the ductwork, make sure the unit
is positioned to allow condensate to drain back down the steam
hose to the steam generator. The duct distributor pipe has a built-
in pitch to allow condensate to drain back into the hose. The hose
must be installed with a minimum 8% (1” per foot) pitch back to the
humidifier to allow condensate to drain back to the steam cylinder.
(See Figure 5.) The steam hose may be used up to a maximum of
10 feet between the unit and the steam distributor. (Additional hose
may be required.) There can not be sags in the steam hose, as
this will create a trap and will produce back pressure in the steam
cylinder and may blow condensate in the duct. (See Figure 6.)
VERTICAL DUCT
HORIZONTAL DUCT
MIN. 8%
10.00 MIN.
(254 mm)
NO SAGS
ALLOWED
Herrtronic
®
Model 6500
HORIZONTAL DUCT
INCORRECT
NO SAGS ALLOWED
Note: Internally lined duct should be removed in the
steam evaporation zone.
Figure 5
Figure 6
