User Guide

TStatSpec
TM
33
When Reset Temp Setpt and Reheat option are selected,
TStatSpec™ displays a warning message:
CAUTION
Selecting both Reheat and Reset Temp Setpt may
cause frequent setpoint adjsutments under certain
dehumidification load conditions. This selection is
not recommended. But TStatSpec will proceed
with this configuration.
Recovery:
The thermostat allows the adaptive intelligent recovery ramp
to continue to the next setpoint during schedule mode
changes. The Setpoints screen allows the user to configure
the recovery parameters. Setpoint recovery will apply to
setpoint changes associated with the following schedule
mode changes:
• Unoccupied to Standby
• Unoccupied to Occupied
Setpoint changes on occupied mode or standby mode to
unoccupied mode, occupied mode to standby mode, and
standby to occupied will use a step change in setpoint. The
heating or cooling recovery ramp will begin before the next
mode transition time. During the recovery ramps, the heating
and cooling set points will be ramped from the existing mode
setpoint to the next mode setpoint.
Refer the following figure
Fig. 29. Cool Recovery Ramp (Heat is upside down)
The setpoint ramp will be at the target setpoint 10 minutes
prior to the occupied/standby event time. This allows the
HVAC equipment an extra 10 minutes to get the space
temperature to the target setpoint during recovery.
Fig. 30. Heat and Cool setpoint Recovery Ramp
There will be two (2) standard options available for choosing
the heating and cooling ramp rates: Single Recovery and
Variable Recovery Ramp Rate.
For heating or cooling recovery, minimum and maximum
recovery ramp rates are provided. Making both of these the
same is called Single Recovery. Making these rates different
is called Variable Recovery.
See the section below for the description of each of the fields
that can be configured:
MINIMUM RAMP RATE:
Minimum Cool and heat recovery ramp rates are selectable
from 0 to 20 DDF/hr ( 0 - 11 DDK/hr). A ramp rate of 0 means
no recovery ramp (the setpoint steps from one setpoint to the
other).
The recovery ramp rate will vary as a function of outdoor
temperature.
The minimum and maximum outdoor temperature
corresponds to the minimum and maximum recovery rate.
Refer to Figure A for heating variable ramp rates and Figure B
for cooling variable ramp rates as given below.