Trane ReliaTel - Operation for RTRM 8.0 and Later with RTEM

RT-SVD03G-EN 159
Outdoor Air Flow Compensation for VAV Units
Operation for RTRM 8.0 and Later with RTEM
Once configured appropriately as described above, the potentiometers "Design Min Pos" and "DCV
Min Pos" must each be set in order to control the OA damper position. The Design Min Pos
potentiometer determines the OA damper position (from 0 to 50%) when the IGV / VFD is at 100%.
The DCV Min Pos potentiometer determines the OA damper position (from 0 to 50%) when the IGV
/ VFD is at 0%.
Note: This function is disabled if a building management system (ICS, Tracer, LonTalk) is providing
an OA damper minimum position setpoint to the unit. This function is disabled if the unit
is using a CO2 sensor input at the DCV input or if a building management system (ICS,
Tracer, LonTalk) is providing a CO2 sensor input to the unit.
The Active Economizer Minimum Position will be computed as a linear function, based on reported
inlet vane or VFD position, given the two endpoints:
1. Minimum Position with IGV @ 100%
2. Minimum Position with IGV @ 0%
Table 51.
OA damper minimum position when IGV is closed /VFD at min. HZ
MIN POS 0%
(CCW)
MIN POS 25%
MIN POS 50%
(CW)
DCVSP (DCV UL SP)0% 0 (closed) 25% 50%
DCVSP (DCV UL SP) 50% 25% 37.5% 50%
DCVSP (DCV UL SP)100% 50% 50% 50%
Figure 87. OA Damper Minimum Position with IGV/VFD at 0% and 100%