Time-Based Control Of Fan, Pump, Etc. - T775 (All Models); Configuration Example - Honeywell T775 Series Application Manual And Cross Reference

T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
Time-based Control of Fan, Pump, etc. –
T775 (all models)
Application Description
In this example, the T775B is able to energize a fan, pump,
lights, economizer, or other device based on a daily time
schedule rather than based on temperature.
Operation
In this example, one relay will energize at 6:00 a.m. and de-
energize at 6:00 p.m. daily to operate a fan, pump, or anything
at all.

Configuration Example

Place a 1,000 Ohm resistor at Sensor B (to simulate a
constant 32° F (0° C) temperature reading).
Wire the device to the normally open contacts on a relay.
Relay 1 is used in this example. See Fig. 7
Programming Example
Program in Setup for:
— Outputs
Options
Use Scheduler = YES
Program in Schedule for:
— Options
Set Date = current date
Set Time = current time
Set Daylight = YES or NO
— Mon-Fri
E1 Setpoint = Setpoint
E1 Time = 06:00 AM
E2 Setpoint = Setback
E2 Time = 6:00 PM
Relay 1: Control the device (fan, pump, etc.)
Program for:
— Setpoint = 0° F (-17° C)
— Differential = 1° F (-17° C)
— Sensor = Sensor B
— Setback =100° F (38° C)
— Action = Cool
Now the relay will close at 6:00 a.m. and open at 6:00 p.m.,
daily.
1
The Date must be set before the Time is set.
63-7147—3
1
NOTE: Keep in mind that if the scheduler is energized, all
relays will follow the time schedule. If you do not
want some outputs to go into a setback mode,
choose Scheduler = NO for those outputs, or
program the setpoint and setback to the same
temperature.
IMPORTANT
After the desired value is selected, be sure to press
the # or $ or HOME button in order to save that
value in the controller's memory.
Wiring
All output relays should have a common power wiring source,
which may or may not be the same as the T775 power wiring.
FAN,
L2
PUMP,
L1
LIGHTS,
(HOT)
ECONOMIZER,
OR
OTHER DEVICE
1 INSERT 1000 OHM RESISTOR.
24 VAC POWER TERMINAL BLOCK.
2
POWER WITH 24 VAC OR 120/240 VAC AT THE APPROPRIATE
3
TERMINAL BLOCK.
Fig. 7. T775B Wiring for time-based fan, pump or other
12
1
T
T775B
T
T
SENSOR B
T
2
+
C
RELAY RELAY
4 3
NC NC
C
C
NO
NO
NO NO
C C
NC NC
RELAY RELAY
1 2
device.
3
120 VAC
M28021