H-20/35 VR Series Proportioning Unit
22
42942-VR-1, Issue 1
11. Properly ground all auxiliary equipment. The high velocity flow of fluid can create
static sparking, which may 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. Proceed as follows:
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.
d) Connect the material supply system to the inlet of the proportioning unit.
Use caution when connecting the chemical hoses to the appropriate
Proportioning Pump.
IMPORTANT: Before using the equipment, it is necessary to purge the entire
chemical system of air and mineral oil (left over from factory testing) and to verify
proper rotation of the motor.
13. To purge the machine and verify proper rotation proceed as follows:
a) Turn on the Main Air Supply to the Transfer Pumps and drums/day tanks.
b) Open both Iso and Polyol Inlet Supply Valves. It is a good practice at this
point to check for chemical leaks.
NOTE:
If the inlet chemical pressure is
below 40 psi, the audible alarm
will sound when the Control
Power Switch is turned ON.
c) Turn the Hydraulic Pump Flow Adjustment clockwise for both pumps until
approximately ¼” of the adjustment is showing.
d) Turn ON the red Main Disconnect. The white Main Power Light will light
up.
e) Turn ON the amber Control Power Switch. The light within the switch and
the Temperature Controllers will light up. If the audible alarm sounds, reset
by pressing Alarm Rest on side of console.
f) Take the Coupling Block and hold it with the Iso and Polyol Ports over
separate containers, open both manual valves.
g) Turn ON the Hydraulic Motor Switch.
h) Turn the Pump Mode to the SERVICE Position.
WARNING:
A QUALIFIED ELECTRICIAN SHOULD PERFORM THIS STEP.
If the pumps don’t cycle back and forth, the motor has been wired incorrectly. Turn OFF
Hydraulic Motor, Control Power Switch and Main Disconnect. Close inlet supply valves.
Remove power from power cord and switch any two leads to the Main Disconnect. Return
to step d)
i)
Allow material to flow out of the coupling block until all spitting of air stops
and all traces of residual material have disappeared.
NOTE:
Disposal of waste chemicals must
be in accordance with local, state,
and federal codes.
j)
Turn the Pump Mode to the RUN Position and close inlet supply valves.
k) Allow the Hydraulic Pumps to run for 10 –15 minutes to remove all residual
air in the hydraulic lines.
