C - A 20
TCONT900AC43UA Installer’s Guide
4 Heat/3 Cool/ Heat Pump
Communicating Programmable 3-Wire Hookup
(A/T)CONT900AC43UA Installer 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.
Table 6. Installer System Tests Continued.
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,
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