Graco 259079 Operation Manuals page 31

The proportioner coolant loop circulates coolant
through secondary heat exchangers (HE) located
on the back of the proportioner to heat the A
and B component material before the material is
pressurized in the proportioner pumps (PA, PB). After
the A and B material has been heated in the heat
exchangers, the material enters the fluid manifold
(FM) and heated hose.
PB
A and B Component Material Flow
Figure 22
3A1705E
For models with a booster heater, the A and B
material enters the booster heater after the material
is pressurized in the proportioning pumps to heat the
material higher than 140°F (60°C).
FM
HE
PA
Overview
31