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Operation - Honeywell T7100D Product Data

Microelectronic commercial thermostats and subbases
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T7100D,E,F MICROELECTRONIC COMMERCIAL THERMOSTATS AND Q7100A,C,D SUBBASES

OPERATION

Thermal Performance
During severe weather, the thermostat actually controls closer
to the setpoint than a electromechanical control. This is
because the heat anticipator is replaced by two electronic
control strategies—cycling by heat anticipation and
proportional plus integral control.
Electronic cycling by heat anticipation acts like a traditional
heat anticipator except that it never needs adjusting for
various control circuit load currents. It cycles off the heating
system slightly before the room temperature reaches the
setpoint to keep the heat remaining in the ductwork from
overheating the room.
In severe weather, a conventional control with a heat
anticipator tends to turn off the system too soon so the
effective setpoint is somewhat below the setpoint. In very cold
weather, the difference between setpoint and effective control
point can be 5°F or 6°F (2°C or 3°C) with a conventional
control. This phenomenon is called droop .
Proportional plus integral action eliminates droop by adjusting
the on time of the stage that is cycling longer or shorter until
the control point matches the setpoint. The thermostat
maintains the space temperature within 1°F of the setpoint.
The zero droop performance provides improved occupant
comfort and energy savings. Occupants do not need to
continually adjust thermostat settings to maintain desired
temperature, even during severe weather.
Operation Sequence
The thermostat energizes specific terminals, depending on
the Fan and System settings. The LCD displays the time,
room temperature, system and fan selection. Symbols are
displayed when the heating, cooling or fan is energized. See
Tables 9 and 10 for specific information.
NOTE: Not all the subbase models have all the terminals
listed in the Energize column.
68-0163—3
Table 9. Conventional Thermostat Sequence of Operation.
Selection
Fan System
Call
Off
None
Auto
On
Off
None
Auto
Cool
None
Auto
Cool or
Stage 1
Auto
Cooling
Auto
Cool or
Stage 2
Auto
Cooling
Auto
Heat
None
Auto
Heat or
Stage 1
Auto
heating
Auto
Heat or
Stage 2
Auto
heating
Auto
Auto
None
a
When Installer Setup 02 is set to 01 (electric heat), G is
energized and the fan symbol is also displayed.
b
Based on last piece of equipment called (cooling = O or
heating = B) and Installer Setup selection.
Table 10. Heat Pump Thermostat Sequence of Operation.
Selection
Fan System
Call
Off
None
Auto
On
Off
None
Auto
Cool
None
Auto
Cool or
Stage 1
Auto
Cooling
Auto
Cool or
Stage 2
Auto
Cooling
Auto
Heat
None
Auto
Heat or
Stage 1
Auto
heating
Auto
Heat or
Stage 2
Auto
heating
Auto
Heat or
Stage 3
Auto
heating
Auto
Em
None
Heat
Auto
Em
Stage 1
Heat
heating
Auto
Em
Stage 2
Heat
heating
Auto
Auto
None
a
Three-stage heat model only.
b
Aux Ht does not appear if it is a three-stage heat system.
c
Based on last piece of equipment called (cooling = O or
heating = B) and Installer Setup selection.
12
Energize
Display
None
None
G
O
None
O, G and Y or O,
and
G and Y1
O, G and Y2
and
B
None
a
B and W
or
and
a
B and W1
a
B and W2
and
b
None
O or B
Energize
Display
None
None
G
O
None
O, G and Y, or O,
and
G and Y1
O, G and Y2
and
B
None
B and W, B and
and
a
W1, or B and Y1
B and W2, or B
,
,
a
and Y2
and Aux Ht
B, Y1, Y2
,
,
and W3
and Aux Ht
B and X1
Em Ht
B, X1 and E
,
,
and Em Ht
B, X1, E
,
, Em Ht
and W2
and Aux Ht
c
None
O or B
b

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T7100eT7100fQ7100aQ7100cQ7100d