Graco Therm-O-Flow 20, Instructions - Parts Manual

Page: 18 / 66

Operation
18 309858K
High Temperature Alarm
Should a component temperature go outside the preset
range for any of the zones, power to heated components
is interrupted, and the HIGH TEMPERATURE ALARM
light turns ON. F
IG
. 5, page 17. The alarm automatically
turns OFF and the system resets when the temperature
is back in range.
Auto Heat Off
Your system may have an inactivity (worklife) timer. If the
pump does not operate for a set amount of time, the
inactivity timer turns off power to the heaters, and the
the AUTO HEAT OFF (64) light turns on.
To set the inactivity timer, see the documentation pro-
vided inside the control panel.
To reheat the supply unit:
1. Turn the HEAT switch (66) OFF, then ON. F
IG
. 6.
2. Wait until all supply unit components return to oper-
ating temperature.
3. Resume operation.
Ground Fault Interrupt
The control panel includes a ground fault interrupt (GFI)
circuit breaker (F
IG
. 7). If the main electrical disconnect
is ON, but all lights on the electrical control panel are off,
have a qualified electrician check the ground fault inter-
rupt.
To reset:
.
1. Turn main electrical disconnect OFF.
2. Open electrical control box and locate the Ground
Fault Interrupt switch (71). The GFI should be in a
neutral position, between ON and OFF.
3. Turn GFI switch OFF, then ON.
4. Close the door and turn the main electrical discon-
nect ON.
For more information about the GFI switch, see the elec-
trical control panel documentation.
F
IG
. 6
ON OFF
HEAT
66
WARNING
The main electrical disconnect must be OFF and qual-
ified electrician must perform service. Read warnings,
page 4.
F
IG
. 7
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WIRE DUCT 1 X 2
WIRE DUCT 1 X 2
WIRE
DUCT
1-1/2
X
2
WIRE
DUCT
1
X
2
WIRE
DUCT
1
X
2
WIRE DUCT 1 X 2
108
GFI
BUSS
GND
DISC
TR112
CR
166 125
TR168
FU103 FU104
SSR138
FU100
SSR160
CR118 MCR125
MCR
CR118
SSR160
CR166
SSR140
SSR138
SSR153
SSR153
SSR140
FU101
FU102
SSR131
SSR133
CON127
SSR131
SSR133
OFF
ON
108
OFF
ON
OFF
ON
71