Checking Resistance - Graco Therm-O-Flow 5 Instructions-Parts List Manual

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.
310528
16
Installation
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-
3-Zone RTD Sensors
Zone Component Terminals
1
2
3
4-Zone RTD Sensors
Zone Component Terminals
1
2
3
4
F).
ture (63_ – 77_
Follower 1311 &
1321
Dispense 1531 &
Hose 1541
Dispense 1601 &
Gun 1611
Follower 1311 &
1321
Dispense 1531 &
Hose 1541
Dispense 1601 &
Gun 1611
Pump 1381 &
1391
Value Range
107 – 109 ohms
97.4 –
102.8 ohms
97.4 –
102.8 ohms
Value Range
107 – 109 ohms
97.4 –
102.8 ohms
97.4 –
102.8 ohms
97.4 –
102.8 ohms