Ingersoll-Rand ReliaTel, Manual, Page: 56 / 176

56 RT-SVD03L-EN
• Once the overflow condition has been cleared and
the input is OPEN for 6 seconds, all diagnostic
conditions will be cleared. The unit will return to
normal operation. Auto-reset clearing will occur
twice each time the unit is powered up. On the third
occurrence, the unit will initiate a lock-out and
require manual reset. If an auto-reset overflow
occurs once, but does not occur again for 72 hours,
the trip counter will reset allowing more auto-resets
to occur.
• If overflow occurs during morning warm up (MWU)
or daytime warm up (DWU), the unit will not return
to warm up once diagnostic has been cleared.
However, if the zone temperature remains lower
than the initiate setpoint for DWU, the unit will
enter DWU upon reset.
• If overflow trip occurs during a purge cycle on
dehumidification, purge will discontinue, but will
resume with a full 3 minute counter upon reset of
the trip.
• If unit power cycle is used to reset a trip, the unit
will not carry forward any previous mode.
• During manufacturing test mode, the overflow trip
indication will be reflected in the Modbus/BAS data
packets, but will not result in shutdown of any unit
components. The lockout trip counter will also be
continually reset to zero to allow unlimited trips
during this mode.
Fresh Air Measurement and
Control
Fresh air measurement and control function measures
the airflow through the outdoor air damper. Using this
measurement and comparing it with the desired
temperature, this function can vary the position of the
damper to keep the fresh air flow within the specified
range to maintain the desired temperature.
Service Test - Traq ™ control functionality will be active
during service test in all steps where the outside air
(OA) damper is held in the minimum position. This
would be all steps except the “economizing” step
which forces the damper open to 100%.
Sensor calibration adjustment - To make a minor
correction to the Traq
™ airflow reading that is
calculated internally by the ReliaTel ™ system an
adjustment pot is available on the RTVM. This pot can
be used to correct for static local factors such as
altitude. Variable factors such as drift, temperature,
humidity and other changing atmospheric conditions
are corrected as part of the conversion calculation.
Sequence for Setting Calibration
1. Adjust the minimum OA flow setpoint on the RTVM
to desired flow rate for minimum ventilation. Use
voltage vs CFM chart.
2. Initiate service test and step to the minimum
ventilation step. This will set the unit into a constant
ID fan speed and OA damper request to minimum
position. Minimum position will be from the Traq
™
calculation to maintain the OA flow at the setpoint
in
“Step 1,” p. 56 .
3. Wait for the damper position to settle to the desired
flow rate set by the setpoint, it should take about
one minute.
4. Measure OA flow rate via an air balancing
instrument.
5. Adjust calibration pot clockwise or counter-
clockwise to dial-in the flow to match instrument in
“Step 4,” p. 56 .
Table 15. Design minimum OA flow setpoints
Design Min OA Flow
Setpoint (R130)
DCV Min OA Flow
Setpoint (R41)
Voltage
Reading
Airflow CFM Airflow CFM
Voltage Vdc
1000 1000 0.2
1100 1100 0.22
1200 1200 0.24
1300 1300 0.26
1400 1400 0.28
1500 1500 0.3
1600 1600 0.32
1700 1700 0.34
1800 1800 0.36
1900 1900 0.38
2000 2000 0.4
2100 2100 0.42
2200 2200 0.44
2300 2300 0.46
2400 2400 0.48
2500 2500 0.5
2600 2600 0.52
2700 2700 0.54
2800 2800 0.56
2900 2900 0.58
3000 3000 0.6
3100 3100 0.62
3200 3200 0.64
3300 3300 0.66
3400 3400 0.68
3500 3500 0.7
3600 3600 0.72
3700 3700 0.74
3800 3800 0.76
3900 3900 0.78
4000 4000 0.8
4100 4100 0.82
4200 4200 0.84
4300 4300 0.86
4400 4400 0.88
4500 4500 0.9
4600 4600 0.92
4700 4700 0.94
4800 4800 0.96
4900 4900 0.98
5000 5000 1
5100 5100 1.01
5200 5200 1.02
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