Graco 918334, Instructions-Parts List Manual

Page: 16 / 86

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Installation
Checking Resistance
WARNING
ELECTRIC SHOCK HAZARD
Do not open the electrical control panel,
unless you are a trained professional.
Before opening the control panel, make sure that
all power has been removed from the control panel.
Sensor Resistance Checks
WARNING
ELECTROCUTION HAZARD
To reduce risk of injury or damage to
equipment, conduct these electrical
checks with the main disconnect OFF.
The supply unit includes either three or four heat sen-
sors and controllers for each heated zone. To check
sensor resistance:
1. Make sure the power is off and that the disconnect
switch is in the OFF position.
2. Make electrical resistance checks for the compo-
nents. Refer to
Schematics
on page 67 for wiring
diagram information.
3. Replace any parts whose resistance readings do
not comply with the ranges listed in the chart
below.
NOTE: Check resistance at ambient room tempera-
ture (63 _ – 77 _
F).
3-Zone RTD Sensors
Zone Component Terminals Value Range
1 Follower 1311 &
1321 107 – 109 ohms
2 Dispense
Hose 1531 &
1541 97.4 –
102.8 ohms
3 Dispense
Gun 1601 &
1611 97.4 –
102.8 ohms
4-Zone RTD Sensors
Zone Component Terminals Value Range
1 Follower 1311 &
1321 107 – 109 ohms
2 Dispense
Hose 1531 &
1541 97.4 –
102.8 ohms
3 Dispense
Gun 1601 &
1611 97.4 –
102.8 ohms
4 Pump 1381 &
1391 97.4 –
102.8 ohms