Model FF-2500 Proportioning Unit
14
25942-1, Issue 4
3. Close the console cover. Reinstall the four (4) screws retained from Step 1.
4. Set up the chemical supply, air supply and moisture control systems as required.
See the system instructions for proper set-up and operating procedures.
5. Properly ground all auxiliary equipment. If not grounded, the high velocity flow of
fluid can create a static charge, which may spark and cause fire or explosion.
Certain solvents that are commonly in use with this equipment are flammable and
may present a flash danger to the operator.
a) Ground the material supply (transfer pumps/day tanks).
b) The 2:1 transfer pump has a ground lug. Ground the pump in accordance with
the instructions provided with the pump.
c) Check that the proportioning unit ground at the main electrical source is
installed in accordance with the National Electrical Code. If a generator will
be powering the unit, consult with your electrician about additional grounding
measures that may be required.
Material Supply Connections
Connect the material supply to the inlets of the proportioning unit as follows:
1. Ensure that the A- and R- inlet ball valves on the proportioning unit are closed.
2. Connect and tighten the R- (resin) supply hose to the 3/4 FPT swivel fitting on the
R- inlet ball valve, and to the resin transfer pump.
3. Connect and tighten the A- (isocyanate) supply hose to the 1/2 FPT swivel fitting on
the A- inlet ball valve, and to the isocyanate transfer pump.
4. Connect the air supply to the 1/4 MPT nipple on the 2:1 transfer pump. Remove the
cap to access it.
5. Connect the main air supply to the proportioning unit. The main air inlet at the air
filter requires a 3/8 NPT fitting.
IMPORTANT: The main air supply must be clean and free of contaminants.
A minimum of 3/8-inch inside diameter air line (not supplied) should be used to
deliver the air supply to the proportioning unit. A main air shutoff valve to the
proportioning unit is recommended.
