Dow FROTH-PAK Refill Systems - Manual (Page 29)

dow Building Solutions
25 . Re-open the on-off valve located near the filter and
allow the chemical to flow in an appropriate container .
If the chemical flow is unobstructed, the blockage
exists in the chemical hose which must be replaced .
26 . If the blockage persists, examine the tank filter . The
arrow on the filter should be pointing away from the
tank . If not, change the filter direction, steps 31-41 . If
the filter was installed correctly, continue with step 42 .
27 . Close the on-off valve .
28 . Close the chemical tank valve .
29 . Open the on-off valve located near the filter to
depressurize the filter .
30 . Disconnect the on-off valve from the filter .
31 . Disconnect the filter from the chemical tank valve .
32 . Reconnect the new filter with the arrow pointing away
from the tank .
33 . Reconnect the on-off valve with the swivel to the filter .
34 . Tighten all connections with an adjustable wrench .
35 . Verify that the on-off valve is closed . The handle should be
perpendicular to the valve .
36 . Open the chemical tank valve .
37 . Open the on-off valve and allow the chemical to
flow in an appropriate container . If the flow is full,
reconnect the chemical hose and Gun/Hose assembly
and perform steps 16-23 . If the flow is weak the problem
exists in the tank . Contact your Dow Sales Representative
for assistance .
Section 11
Yield Notes
Board foot yields are based on the free rise of the total weight of
the chemicals in the tanks . Many factors affect the yield in field
applications .
11 .1 Operator Technique
For best results, apply multiple layers of foam . When spraying,
apply one-quarter to one-half inch thickness of uncured foam .
This will produce a one to one-and-one-half inch thickness of
fully cured foam .
11 .2 Application
avoid spraying over rising foam .
11 .3 Temperature
To ensure proper chemical mix, reaction, cure, and optimum
yields, chemicals should not be dispensed if the chemical
temperature is below 65°F (18°C) . Insufficient operating
temperatures can cause improper mix, extend cure time, and
adversely affect final physical properties and yields .
nOTe: When using polyurethane foam, estimate 30% more foam than is
required. This yield buffer is recommended so that you will not run out of
chemical on a job site.
21