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ELECTROSTATIC DISCHARGE (ESD)
PRECAUTIONS PROCEDURE
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to unit
components.
Electrostatic discharge can affect electronic components.
Take precautions during furnace installation and servicing to
protect the furnace electronic control. Precautions will
prevent electrostatic discharges from personnel and hand
tools which are held during the procedure. These precautions
will help to avoid exposing the control to electrostatic
discharge by putting the furnace, the control, and the person
at the same electrostatic potential.
3. Disconnect all power to the furnace. Multiple disconnects
may be required. DO NOT TOUCH THE CONTROL OR
ANY WIRE CONNECTED TO THE CONTROL PRIOR
TO DISCHARGING YOUR BODY'S ELECTROSTATIC
CHARGE TO GROUND.
335122-201 REV. B LIT TOP
Fig. 4 - - Clearances to Combustibles
4. Firmly touch the clean, unpainted, metal surface of the
furnace chassis which is close to the control. Tools held in
hand during grounding will be discharged.
5. After touching the chassis, you may proceed to service the
control or connecting wires as long as you do nothing to
recharge your body (moving or shuffling feet, touching
ungrounded objects, etc.).
6. If you touch ungrounded objects, firmly touch a clean,
unpainted metal surface of the furnace again before
touching control or wires.
7. Use
(ungrounded) furnaces.
8. Before removing a new control from its container,
discharge your body's electrostatic charge to ground to
protect the control from damage. If the control is to be
installed in a furnace, follow items 1 through 4 before
bringing the control or yourself in contact with the
furnace. Put all used and new controls into containers
before touching ungrounded objects.
9. An ESD service kit (available from commercial sources)
may also be used to prevent ESD damage.
7
this
procedure
for
installed
A08435
and
uninstalled
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