Trane ReliaTel - Failure and Override Modes of Operation

11 2 RT-SVD03G-EN
Space Pressure Control with Statitrac (27.5-50 Tons)
Failure and Override Modes of Operation
Failure Modes
1. Space Pressure Sensor Failure: Diagnostic condition is called out and unit falls back to exhaust
fan and damper control w/o Statitrac. The exhaust damper position will track the active OA
Damper position once the OA Damper rises above the Exhaust Enable Setpoint and the exhaust
fan energizes. For the duration of the sensor failure, the RTRM System LED will flash the 2-blink
error code. Once the Space Pressure sensor returns within the valid range, the unit will resume
normal space pressure control with Statitrac.
2. Space Pressure Setpoint Failure: Unit falls back to using default setpoint values to continue
space pressure control.
3. RTVM Communication Failure:
If the RTVM loses communication with the RTRM, the following actions shall occur:
a. The Space Pressure Control function will be disabled.
b. The Exhaust Fan will be de-energized.
c. The Exhaust Damper will be closed to min position.
d. The Outside Air Damper will be forced to min position (economizing will be disabled.)
e. The RTRM System LED will blink a 2-flash error code after 2 minutes.
f. The RTVM System LED will blink the ¼ second ON and 2 seconds OFF error code.
4. RTOM Comm. Failure: The unit shall utilize the default Exhaust Enable Setpoint of 25% for
exhaust fan control.
5. RTEM Comm. Failure: The unit will disable space pressure control; the OA Damper and Exhaust
damper will be at min position and the Exhaust Fan will be OFF.
6. Supply Fan Failure: Once the unit has a supply fan failure, the exhaust fan will be de-energized
and the exhaust damper will be closed to min position until the unit goes through a manual
reset or power cycle.
Override Modes
1. Ventilation Override Modes
• Pressurize - During VOM Pressurize, the unit will de-energize the exhaust fan and override
the exhaust damper closed (2Vdc)if configured for Statitrac.
• Purge - During VOM Purge, the unit will energize the Exhaust Fan and open the Exhaust
Damper 100% if configured for Statitrac.
• Exhaust - During VOM Exhaust, the unit will energize the Exhaust Fan and open the Exhaust
Damper 100% if configured for Statitrac.
2. Service Test Mode
The exhaust damper shall actuate up to 100% during the Economizer step of Service Test when
the unit is configured with Statitrac. For all other service test steps, the exhaust damper will be
at minimum position.