Graco 259079 Operation Manuals page 32

Overview
Coolant only flows through the secondary heat
exchangers when the heat exchanger control valves
(VA, VB) are open and the A and B component
temperatures are below the target temperatures set
on the ADM. See Fig. 24.
When the control valves (VA, VB) close, the A
and B material has reached target temperature.
Coolant flows through the bypass control valve (VC),
circulation pump (CP), sight glass (SG), proportioner
coolant fill bottle (HF), and back to the heat exchanger
in the engine coolant loop. See Fig. 23
CP
VC
VB
HE
Proportioner Coolant Loop — A and B Valves Closed
(not heating material)
Figure 23
32
SG
VA
HE
CP
VC
VB
HE
Proportioner Coolant Loop — A and B Valves Open
(heating material)
Figure 24
SG
VA
HE
3A1705E