Control Response Rate; Cycle Rate; Auto Changeover - Trane ACONT900AC43UA Service Manual

(A/T)CONT900AC43UA Installer Guide
recommended that the fan only be used in the
AUTO mode.

Control response rate

A set of more/less aggressive Proportional-Integral
control constants can be chosen to increase/decrease
the responsiveness of the temperature control per-
formance. Choosing a more aggressive rate may
cause overshooting. Furthermore, selecting a less
aggressive rate may result in undershooting.

Cycle rate

Cycle rate is the selected number of system cycles
per hour at 50% load. If the cycle rate were set to 3,
C - A 20
Table 6. Installer System Tests Continued.
TCONT900AC43UA Installer's Guide
each ON/OFF cycle would be 20 minutes long when
operating at 50% load. The total ON and/or OFF
times depends on the actual indoor space load. A
shorter cycle rate may be desired for Heating mode
to maintain tighter control to indoor setpoint. A longer
cycle rate may be desired for Cooling mode to allow
the system to remove moisture from the air and im-
prove indoor comfort.

Auto changeover

When the system mode is set to Auto, the control
automatically switches between heating and cooling
modes to maintain the desired comfort level.
4 Heat/3 Cool/ Heat Pump
Communicating Programmable 3-Wire Hookup