Installation
8
311513D
Check the Resistance Between
the Supply Unit and the True
Earth Ground
Have a qualified electrician check the resistance
between each supply unit component and the true earth
ground. The resistance must be less than 0.25 ohms. If
the resistance is greater than 0.25 ohms, a different
ground site may be required. Do not operate the system
until the problem is corrected.
Checking Resistance
You can check the resistance of the supply unit's heat
sensors and heaters.
Sensor Resistance Checks
To verify the RTD sensors to be used with the 4-zone
heat control, refer to the table below.
An ohm meter can be used to check the resistance
between the terminals indicated. To check the 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.
3.
Replace any parts whose resistance readings do
not comply with the ranges listed in the chart below.
The resistance between the supply unit compo-
nents and true earth ground must be less than 0.25
ohms.
Use a meter that is capable of measuring resis-
tance at this level.
Do not open the electrical control panel unless you
are a trained professional. Before opening the con-
trol panel, make sure that all power has been
removed from the control panel.
Table 2: RTD Sensors, 4-Zone Control
Zone
Component
Terminals
Value
Range,
ohms
1
Dispense
Hose 1
2011 &
2021
108 +/- 2%
2
Dispense Gun
1
2041 &
2051
108 +/- 2%
3
Dispense
Hose 2
2081 &
2091
108 +/- 2%
4
Dispense Gun
2
2110 &
2111
108 +/- 2%
Check resistance at 63-77°F (17-25°C).
