Van Air Systems FP-4 Installation, Operation & Maintenance Instructions Manual page 23

1. PROGRAMMING
PROGRAM
RELAY 1
DIFFRNTL
Fig. 29. Program - Differential or Throttling Range.
PROGRAM
RELAY 1
SENSOR
Fig. 30. Program - Sensor.
PROGRAM
RELAY 1
HEAT/COOL
Fig. 31. Program - Heat/Cool.
MENU
1.2.2. DIFFERENTIAL or THROTTLING RANGE
PROGRAM
RELAY 1
Differential is used for Relay outputs and Throttling Range
DIFFRNTL
is used for Modulating outputs.
1. From the menu, use the
2. Press the
20 o
F
3. Use the
ENTER
DIFFERENTIAL
FOR
RELAY 1
M24495
4. Press the
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.
MENU
1.2.3. SENSOR
PROGRAM
RELAY 1
SENSOR
1. From the menu, use the
SENSOR A
SENSOR B
2. Press the
3. Use the
4. Press the
SELECT
SENSOR FOR
RELAY 1
M24496
MENU
1.2.4. HEAT/COOL
PROGRAM
RELAY 1
HEAT/COOL
1. From the menu, use the
HEAT
COOL
2. Press the
3. Use the
4. Press the
SELECT
HEAT/COOL
FOR
RELAY 1
M24497
15
T775A/B/M SERIES 2000 CONTROLLER
and
light THROT RNG or DIFFERNTL.
button to display the throttling range
value.
and buttons to increase/decrease the
desired value.
Default: 20°F (-6.6°C)
Range: 1°F to 150°F (1°C to 66°C).
button to accept the value and display
the next option.
and
light SENSOR.
button to display the sensor selections.
and buttons to select Sensor A or B.
button to accept the highlighted sensor
and display the next option.
and
light HEAT/COOL.
Default: HEAT
button to display the heat and cool
selections.
and buttons to select Heat or Cool.
button to accept the highlighted selec-
tion and display the next option.
buttons to high-
buttons to high-
buttons to high-
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