1. PROGRAMMING T775A/B/M SERIES 2000 CONTROLLER
15 62-0254–03
Fig. 29. Program - Differential or Throttling Range.
1.2.2. DIFFERENTIAL or THROTTLING RANGE
Differential is used for Relay outputs and Throttling Range
is used for Modulating outputs.
1. From the menu, use the S and T buttons to high-
light THROT RNG or DIFFERNTL.
2. Press the X button to display the throttling range
value.
3. Use the S and T buttons to increase/decrease the
desired value.
Default: 20°F (-6.6°C)
Range: 1°F to 150°F (1°C to 66°C).
4. Press the X button to accept the value and display
the next option.
In heating mode, the Differential is below the setpoint.
The relay de-energizes when the temperature rises to the
setpoint. As the temperature drops to the setpoint minus
the Differential, the relay energizes.
In cooling mode, the Differential is above the setpoint.
The relay de-energizes when the temperature falls to the
setpoint. As the temperature rises to the setpoint plus the
Differential, the relay energizes.
The Throttling Range brackets the setpoint setting, e.g., if
the setpoint is 72°F and the throttling range is 10°F, then
the effective throttling temperature range is 67°F to 77°F.
This applies to both modulating outputs and floating
outputs.
Fig. 30. Program - Sensor.
1.2.3. SENSOR
1. From the menu, use the S and T buttons to high-
light SENSOR.
2. Press the X button to display the sensor selections.
3. Use the S and T buttons to select Sensor A or B.
4. Press the X button to accept the highlighted sensor
and display the next option.
Fig. 31. Program - Heat/Cool.
1.2.4. HEAT/COOL
1. From the menu, use the S and T buttons to high-
light HEAT/COOL.
Default: HEAT
2. Press the X button to display the heat and cool
selections.
3. Use the S and T buttons to select Heat or Cool.
4. Press the X button to accept the highlighted selec-
tion and display the next option.
ENTER
DIFFERENTIAL
FOR
RELAY 1
PROGRAM
RELAY 1
DIFFRNTL
MENU
PROGRAM
RELAY 1
DIFFRNTL
20
F
o
M24495
MENU
PROGRAM
RELAY 1
SENSOR
SELECT
SENSOR FOR
RELAY 1
SENSOR A
SENSOR B
PROGRAM
RELAY 1
SENSOR
M24496
PROGRAM
RELAY 1
HEAT/COOL
MENU
PROGRAM
RELAY 1
HEAT/COOL
SELECT
HEAT/COOL
FOR
RELAY 1
HEAT
COOL
M24497
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