Checking Resistance Of Electrical Components - Graco Therm-O-Flow 55-H Instructions-Parts List Manual

Checking Resistance of Electrical
Components
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.
You can check the resistance of the supply unit's heat
sensors and heaters.
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 heat sensors and controllers
for each of the heated zones. To check sensor resis-
tance:
1. Make sure the power is off and that the disconnect
switch is in the OFF position.
Installation
2. Make electrical resistance checks for the compo-
nents listed below. See the appropriate wiring
diagrams.
Model:
C32428
C32429
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-
RTD Sensors
Zone Component
1
2
3
4
5
6
VAC: Pages:
240 60 – 64
480 66 – 70
F).
ture (63 – 77
Terminals
Follower 1321 &
1331
Dispense 1521 &
Hose 1 1531
Dispense 1661 &
Hose 2 1671
Pump 1391 &
1401
Dispense 1591 &
Gun 1 1601
Dispense 1731 &
Gun 2 1741
Value Range
97.4 – 102.8 ohms
97.4 – 102.8 ohms
97.4 – 102.8 ohms
97.4 – 102.8 ohms
97.4 – 102.8 ohms
97.4 – 102.8 ohms
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