Start-Up
40 RT-SVX23F-EN
• To Increase/Decrease Fan RPM turn DA COOL_FAN
SPD on the RTOM clockwise/counter-clockwise.
3. If the required CFM is too high, (external static
pressure is low causing motor HP output to be above
table value), change indoor fan speed and repeat Step
1 and Step 2.
• Stop the SERVICE TEST, turn the main power
disconnect switch to the “Off” position and reconnect
Economizer 4-pin power connector if disconnected for
this procedure.
• Proceed to the next component start-up procedure.
Return Air Smoke Detector
The return air smoke detector is designed to shut off the
unit if smoke is sensed in the return air stream. Sampling
the airflow entering the unit at the return air opening
performs this function.
In order for the smoke detector to properly sense smoke in
the return air stream, the air velocity entering the unit must
be between 500 and 4000 feet per minute. Equipment
covered in this manual will develop an airflow velocity that
falls within these limits over the entire airflow range
specified in the evaporator fan performance tables.
Economizer Start-Up ReliaTel™ Control
Minimum Position Setting for 7.5 - 10Ton with
Multi-Speed, or Single Zone VAV
1. Apply power to the unit
2. Using the ServiceTest Guide on unit access panel,
momentarily jump across theTest 1 &Test 2 terminals
on LTB1 one time to start indoor fan.
3. Turn the MIN POS - DESIGN potentiometer on the
RTEM clockwise to open or counter-clockwise to close.
The damper will open to this setting for low speed fan
operation. When adjusting minimum position, the
damper may move to the new setting in several small
steps.Wait at least 15 seconds for the damper to settle
at the new position.
4. Momentarily jump across theTest 1 &Test 2 terminals
on LTB1, cycle through test modes to Cool 2 (2-Step
Cooling applications) or Cool 3 (3-Step Cooling
applications).Verify the indoor motor rpm is at 100% of
the user selected airflow.
5. Turn the MIN POS - DCV potentiometer on the RTEM
clockwise to open or counter-clockwise to close.This
will set the minimum damper position for high speed
fan operation.
6. The economizer minimum damper position for all fan
speeds is complete.The RTEM will control minimum
damper position along an imaginary line between the
damper minimum positions based on fan speed.
7. Replace the filter access panel.The damper will close
when the blower circuit is de-energized.
Figure 43. Plenum fan rpm label
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical safety
precautions when exposed to live electrical
components could result in death or serious injury.
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
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