POLYURETHANE
MACHINERY
CORPORATION
PHDX-2 SERVICE MANUAL
7. PROPORTIONER PURGING
7
PROPORTIONER PURGING
WARNING!
Use suitable Personal Protection Equipment
(PPE) and follow the recommendations in the Safety Informa-
tion provided by product suppliers when installing or working
with the unit.
WARNING!
Do not turn the Temperature Controllers ON
until the Proportioner purging procedure is complete and the
Primary Heaters and Heated Hoses are filled with material.
NOTE!
Before using the Proportioner it is necessary to purge
the entire system, including Heated Hoses of mineral oil left
over from Quality Control testing and air. The following pro-
cedure is also followed to purge air entrapped by running out
of material in the supply Drum/Reservoirs resulting in a sig-
nificant indicated material pressure imbalance as indicated by
the Pressure Gauges and sprayed material.
1. Ensure the following before proceeding:
a.
Air supply to Transfer Pumps is 90 - 110 psi (6 - 8 bar).
b.
Proportioner inlet ball valves are CLOSED.
c.
All connections are tight.
d.
Material should be stored to the material suppliers recommended temperatures.
e.
Spray gun coupling block is installed and manual valves are closed.
2. Slowly OPEN the Poly (R) Transfer Pump Air Shut-Off Valve allowing Pump to cycle
slowly as it fills the Material Delivery Hose to the Proportioner. Check for leaks.
3. OPEN Poly (R) Coupling Block Manual Valve over a waste container.
4. Slowly OPEN Proportioner Poly (R) Inlet Valve allowing Transfer Pump to move
material through the system. When all spitting of air stops and all traces of mineral
oil have disappeared, CLOSE Poly (R) Coupling Block Manual Valve. Clean Coupling
Block.
5. Repeat steps 2 to 4 for Iso (A) side.
CAUTION!
Properly dispose of all waste chemicals in accor-
dance with all applicable local, state and federal codes. DO
NOT turn on the Auto Countdown Switch or the Pressure
Balance Control Switch.
REVISION 1.1
30
