Tempco tec-220, Instruction Manual, Page: 11 / 36

Dangerous voltages capable of causing death are some-
times present in this instrument. Before installation or
beginning any troubleshooting procedures, the power to all
equipment must be switched off and isolated. Units suspected of
being faulty must be disconnected and removed to a properly
equipped workshop for testing and repair. Component replace-
ment and internal adjustments must be made by a qualified main-
tenance person only.
This instrument is protected by double insulation. To
minimize the possibility of fire or shock hazards do not
expose this instrument to rain or excessive moisture.
Do not use this instrument in areas under hazardous con-
ditions such as excessive shock, vibration, dirt, moisture,
corrosive gases or oil. The ambient temperature of the area
should not exceed the maximum rating specified in chapter 6.
Remove stains from this instrument using a soft, dry
cloth. To avoid deformation or discoloration do not use
harsh chemicals, volatile solvent such as thinner or strong deter-
gents to clean this instrument.
2–1 Unpacking
Upon receipt of the shipment, remove the unit from the carton
and inspect the unit for shipping damage.
2–2 Mounting
Make the panel cutout according to the dimensions shown in
Figure 2.1.
Take the mounting clamp away and insert the controller into the
panel cutout. Reinstall the mounting clamp.
7
Chapter 2 Installation
Wiring
, continued…
Transit Damage
If there is any damage due to transit, report it and
file a claim with the carrier. Write down the model
number, serial number, and date code for future ref-
erence when corresponding with our service center.
The serial number (S/N) is labeled on the box and
the housing of the control.
2–3 Wiring Precautions
• Before wiring, verify the correct model number and options on the label.
Switch off the power while checking.
• Care must be taken to ensure that the maximum voltage rating specified on
the label is not exceeded.
• It is recommended that the power for these units be protected by fuses or cir-
cuit breakers rated at the minimum value possible.
• All units should be installed in a suitable enclosure to prevent live parts from
being accessible to human hands and metal tools. Metal enclosures and/or
subpanels should be grounded in accordance with national and local codes.
• All wiring must conform to appropriate standards of good practice and local
codes and regulations. Wiring must be suitable for the voltage, current, and
temperature rating of the system.
• Beware not to over-tighten the terminal screws. The torque should not
exceed 1 N-m (8.9 lb-in or 10 KgF-cm).
• Unused control terminals should not be used as jumper points as they may
be internally connected, causing damage to the unit.
• Verify that the ratings of the output devices and the inputs as specified are
not exceeded.
• Except for thermocouple wiring, all wiring should use stranded copper con-
ductor with a maximum gage of 14 AWG.
• Electrical power in industrial environments contains a certain amount of
noise in the form of transient voltage and spikes. This electrical noise can
adversely affect the operation of microprocessor-based controls. For this
reason the use of shielded thermocouple extension wire which connects the
sensor to the controller is strongly recommended. This wire is a twisted-pair
construction with foil wrap and drain wire. The drain wire is to be attached
to ground in the control panel only.
Note: All model TEC-220 controls are supplied with
both mounting clamps and mounting screws. The
mounting screws have to be used in NEMA 4X appli-
cations as they allow the control to be held tighter
into the panel. The mounting clamp teeth are released
by depressing the ends of the clamp together.