Unit Start-Up
RT-SVX22M-EN
49
4. Reset based on Outdoor Air Temperature - When DIP
Switch #3 and #4 are “On”,a selectable supply air reset
setpoint of 0°F to 100°F via RTAM potentiometer or
Tracer is permissible.
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.
There are certain models however, if operated at low
airflow, will not develop an airflow velocity that falls within
the required 500 to 4000 feet per minute range. For these
models, the design airflow shall be greater than or equal
to the minimum CFM specified in the table provided
below. Failure to follow these instructions will prevent the
smoke detector from performing its design function.
Economizer Start-Up
Minimum Position Setting for 17 Plus, 7.5-10
Ton with Multi-Speed, or Single Zone VAV
1. Apply power to the unit
2. Using the Service Test 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 - DCV 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. Range of damper for this setting is
0-100%.
4. Momentarily jump across theTest 1 &Test 2 terminals
on LTB1, to cycle through test modes to Cool 1.
5. Turn the DCV SETPOINT - LL potentiometer on the
RTEM clockwise to open or counter-clockwise to close.
This will set the minimum damper position at an
intermediate point of fan operation range of damper
for this setting is 0-75%.
6. Momentarily jump across theTest 1 &Test 2 terminals
on LTB1, to cycle through test modes to Cool 2.
7. Turn the MIN POS - DESIGN potentiometer on the
RTEM clockwise to open or counter-clockwise to close.
This will set the minimum damper position at
maximum fan speed. Range of damper for this setting
is 0-50%.
8. The economizer minimum damper position for all fan
speeds is complete. The RTEM will control minimum
damper position along an imaginary line between the
3 damper minimum positions based on fan speed.
Note: The RTEM will limit intermediate minimum
damper position to ensure proper ventilation based
upon the low fan speed minimum damper position set
in
Step 3
.
9. Replace the filter access panel. The damper will close
when the blower circuit is de-energized.
ReliaTel™ Control:
Using the Service Test Guide in
Table 9, p. 43
, momentarily jump across the Test 1 & Test
2 terminals on LTB1 one time to start the Minimum
Ventilation Test below.
Electro Mechanical Control:
Using the Service Test
Guide perform the proper test mode connections.
1.
Set the minimum position setpoint for the economizer
to the required percentage of minimum ventilation
using the setpoint potentiometer located on the
Economizer Control (ECA).
The economizer will drive to its minimum position
setpoint, exhaust fans (if applicable) may start at
random, and the supply fan will start when the
SERVICE TEST is initiated.
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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