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1. Dangerous voltages may be present in these
instruments. Before installation or troubleshooting,
switch off and isolate power to all equipment. If a unit
is suspected of being faulty, it should be disconnected
and removed to a properly equipped workshop for
testing and repair. Component replacement and
internal adjustments should be performed by qualified
maintenance personnel only.
2. To minimize the risk of fire or shock hazards, avoid
exposing these instruments to rain or excessive
moisture.
3. Do not use these instruments in areas that are prone to
hazardous conditions such as excessive shock,
vibration, dirt, moisture, corrosive gases, or oil. The
ambient temperature of the areas should not exceed
the maximum rating specified.
WARNINGS
Mounting
When mounting one of these instruments, make sure the control and
the ambient temperature remain within the 10–125°F range. The
control may be mounted in any position. Once the control has been
inserted into the panel, use the two mounting brackets provided with
the unit to secure it. Use light to moderate pressure.
Manual Reset Adjustment
The reset adjustment is located on the front of the control.
Approximately half an hour after adjusting the set point, when the
process stabilizes, it may become necessary to adjust “reset” as well.
Start with the reset adjustment pointing to zero. If the temperature
indication stabilizes above the set point, adjust the reset to the
“minus” side; if the temperature stabilizes below the set point, adjust
to the “plus” side. Continue making adjustments until the temperature
indication stabilizes at the set point. Make sure to allow 15 minutes
between adjustments for stabilization.
Wiring
All wiring should conform to local and national codes.
When wiring the thermocouple, make sure that the thermocouple and
extension wire conform to the thermocouple type specified by the
instrument. The thermocouple and the extension wires must have the
same polarity and be the same alloy. For accurate measurements, the
total lead resistance should not exceed 100 ohms.
To assure effective lead resistance compensation when wiring three
wire RTDs (Resistance Temperature Detectors), make sure that all of
the leads that connect to the controller are the same gauge and
composition. Connect the two common wires of the three wire RTD to
terminals 17 and 18. When using a two wire RTD, install a jumper
between terminals 17 and 18.
