Checkout - Honeywell T775A User Manual

After the controller is installed and wired, apply power.
Make initial adjustments and desired settings.
1. As shown in Fig. 8, record the sensed temperatures for
both Sensor A and Sensor B as displayed on the device. Use
the Select key to advance through the programming loop to
determine and then write on the Checkout Table which loads
are controlled by each sensor.
2. Write the operating mode (heat or cool) for each stage
in the Checkout Table.
3. Write the sensed temperature for each load on the
Sensed Temp. line.
4. Write the differential for each load on the Differential
line.
5. Write the setpoint for each stage (Off temperature).
Calculate the On temperature for each stage. (On tempera-
ture is setpoint plus differential for cooling and is setpoint
minus differential for heating.)
6. Plot the on and off (open/closed) values at which the
device will energize and de-energize each output load, (Re-
fer to the Device Programming Worksheet.)
7. Verify which loads are energized by using the Check-
out Table. As shown in the example, the display will indi-
cate, in the lower right corner, which stages are energized. If
no stages are energized, the words "stage energized" will not
appear.
NOTE: If the sensed temperature is between the On and Off
temperatures, the load may either be energized or de-
energized. Refer to the Control Algorithm section for
further explanation.
8. If an error message flashes, refer to the description of
these messages. If SF flashes, check the sensor connections.
If properly connected and SF continues to flash, check the
sensor location to make sure it is located in an ambient con-
dition that is within the sensor capability (-40° to +220°F).
9. If an error message other than SF flashes, the device
cannot be field repaired. Replace the device.
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T775A,B,C,D

CHECKOUT

Checkout
63-2489