Install Instructions

General Filters
Incorporated
11 | P a g e
3.4.2 Steam Manifold Injection (Additional Kit Required) (Used when air flow is between 600 and 1000 CFM.)
If a duct steam manifold is to be used, select an accessible location on the duct, allowing at least 36” of straight duct (no elbows or
obstructions) after the point where the nozzle/manifold will be installed and the clearances can be maintained as per the following
drawings. To mount the steam manifold, cut or drill a 2-1/2” hole in the duct (See Figure 3.j.). Apply caulk to the mounting plate of
the manifold. Attach the manifold to the duct using (4) #10 sheet metal screws (supplied). The manifold must be level, or vertical
with condensate outlet oriented to the bottom.
: Allow 5 feet (1-1/2 M) of straight return duct downstream of the distributor pipe or nozzle for absorption of the steam.
Always allow 3 feet (0.9M) of straight supply duct upstream of the distributor pipe or nozzle for evaporation of the steam. Turbulent
air flow may require longer lengths.
Optional stainless-steel steam manifold
(Canada: GF-DPO30 Kit 12” or GF-DPO45 Kit 17 ½” / USA: DPO30D22R 12” or DP045D22RO 17.5”).
Installing the Steam Nozzle (Section 3. 4.1) or Manifold (Section 3.4.2)
1. Cut a round hole in the side of the duct to match either the nozzle or manifold diameter.
2. Apply silicone sealant to the mounting plate and insert the nozzle or manifold through the hole and secure with sheet metal
screws (See Figure 3.k.).
3. Connect the steam and condensate hoses using the hose clamps supplied. (Note: end support bracket supplied only
with 36” and longer distributors.)
3.4.3 Return Condensate Connection
The return condensate hose from the nozzle must be trapped. Coil the hose into a vertical loop and secure it below the nozzle. This
trap prevents steam from being released into the cabinet. The hose end may be run through the knockout at the top of the humidifier
and inserted into the hole located on top of the fill cup. The hole may be enlarged to suit (See Figure 3.l. below).
3.4.4 Steam Hoses
: MOST OPERATIONAL PROBLEMS ARE CREATED BY IMPROPER STEAM PIPING FROM THE
HUMIDIFIER UNIT TO THE DUCT DISTRIBUTOR PIPES.
To avoid these problems, remember one simple fact when running the steam hose: steam naturally flows up hill and condensate
naturally flows downhill. Run the steam hose or piping to avoid any kinks, sharp elbows, or low spots that could collect or restrict the
flow of steam to the distributor pipe, or the flow of condensate back to the humidifier. Support the hose adequately to avoid sags.
The following diagrams (See Figure 3.m. on next page) are provided as guidelines. Contact General Filters for unusual installations.
3.4.5 Steam Cylinder Hose Adapter (See Figure 3.l.)
Open sealed bag. FOLLOW INSTRUCTIONS to avoid damaging the black steam adaptor.
1. First slip narrow end of adapter into blue steam hose.
2. Insert the steam adapter with the hose installed into the steam unit through upper hole in the
shelf.
3. Insert the red O-ring into large end of black adapter.
4. Slide and lock the fixing bracket to mesh with the 2 slots in the black adapter.
5. Fix the adapter onto the cylinder, then fix the bracket using the supplied screws.
6. Firmly tighten the steam hose clamp (max tightening torque 6Nm – 53 in-lbs.)
Figure 3.j.
Figure 3.l.
25-12 Steam cylinder
hose adapter
Figure 3.k.
Condensate hose
connector
Steam Manifold
Steam Manifold