Bryant THERMIDISTAT TSTAT - Manual (Page 8)

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
UNIT MUST BE INSTALLED IN ACCORDANCE
WITH INSTALLATION INSTRUCTIONS
Cancels: New
© 1997 Bryant Heating & Cooling Systems, 7310 W. Morris St., Indpls., IN 46231
—8—
PRINTED IN U.S.A. Catalog No. 12TS-TA0 8-97
OPERATIONAL INFORMATION FOR ELECTRONIC MODELS
FIVE-MINUTE COMPRESSOR TIMEGUARD
This timer prevents the compressor from starting unless it has been off for at least 5 minutes. It can be defeated for 1 cycle by simulta-
neously pressing the FAN mode button and INCREASE TEMPERATURE (UP) button.
FIFTEEN-MINUTE CYCLE TIMER
This timer prevents the start of a heating or cooling cycle until at least 15 minutes after the last start of the same cycle. Its function is to
assure that equipment is not cycled more than 4 times per hr. This timer is defeated for 1 cycle when the desired temperature is manu-
ally changed. It can also be defeated for 1 cycle by simultaneously pressing the FAN mode button and INCREASE TEMPERATURE
button.
FIFTEEN-MINUTE STAGING TIMER
In multistage heating or cooling, this timer prevents any higher stage from turning on until preceding stage has been on for 15 minutes.
This timer is defeated if temperature error is greater than 5
°
F (usually due to a large change in desired temperature).
MINIMUM ON TIME
In normal operation, when a stage turns on, it will not turn off for a minimum of 2 minutes (3 minutes on Thermidistat Control).
HEAT/COOL SETPOINTS (DESIRED TEMPERATURE)
A minimum difference of 3
°
is enforced between heating and cooling desired temperatures. This is done by allowing 1 setting to “push”
the other, to maintain this difference. (Thermidistat Control 2
°
and adjustable.)
EQUIPMENT ON INDICATORS (THERMIDISTAT CONTROL)
When cooling equipment is ON, a COOL icon preceded by a small triangle is displayed below the cool setpoint. While cooling equip-
ment turn on is delayed by a staging or cycle timer, the triangle will be flashing. The same is true for the HEAT icon and its preceding
triangle located under the heat setpoint. These 2 triangles are also used to indicate the state of the humidify and dehumidify outputs.
See next section.
HUMIDIFY/DEHUMIDIFY OUTPUT ON INDICATORS (THERMIDISTAT CONTROL)
Within humidity select screen (selected by Humidity button and indicated by “hu” or “dhu” on clock display), the triangle under humidity
setpoint will be on while humidify output is on. The triangle under dehumidify setpoint will be on while dehumidify output is active (turned
off, because this output is reverse logic).
AUTO CHANGEOVER
When auto changeover mode is selected, a change from heat to cool (or vice versa) will not occur until an opposite mode demand has
existed for 20 minutes. If setpoint is changed, the 20 minute requirement is deleted.
EMERGENCY HEAT MODE
When thermostat is controlling as a heat pump and emergency heat is selected, all Y signals are locked out, and W becomes energized
upon a call for heat.
SMART RECOVERY
With Smart Recovery selected, transition out of setback begins a fixed time period before selected recovery time and gradually adjusts
room temperature so that the desired temperature will be achieved at selected recovery time.