Honeywell T775A - Page 15

T775A,B,C,D REMOTE TEMPERATURE CONTROLLER
15 63-2489—2
Fig. 14. Four-stage control, 24 Vac input; 24 Vac load.
HEAT MODE
NULL
DIFFERENTIAL 3
TEMPERATURE
RISE
SETPOINT 3
RELAY 1,2 AND 3
ENERGIZED
DIFFERENTIAL 2
SETPOINT 2
RELAY 1 AND 2
ENERGIZED
DIFFERENTIAL 1
SETPOINT 1
RELAY 1 ENERGIZED
TEMPERATURE
FALL
COOL MODE
DIFFERENTIAL 2
TEMPERATURE
RISE
RELAY 1 AND 2
ENERGIZED
RELAY 1 ENERGIZED
DIFFERENTIAL 1
SETPOINT 2
SETPOINT 1
NULL
RELAY 1,2 AND 3
ENERGIZED
DIFFERENTIAL 3
SETPOINT 3
TEMPERATURE
FALL
NOTE: FOR THERMOSTAT APPLICATIONS, CONNECT CONTACT NO OF COOLING STAGE TO Y1 (AND SECOND STAGE TO Y2)
CONNECT CONTACT NO OF HEATING STAGE TO W1 (AND SECOND STAGE TO W2).
SENSOR A
LOAD 4
LOAD 3
LOAD 2
SELECT
SET
ENTER
12
3
4
1
2
3
4
SA SB
C \ F
SENSOR
A
SENSOR
B
TOD
24V
5
6
120V
COM
240V
OUTPUT 2
OUTPUT 1
OUTPUT 3 OUTPUT 4
NO
COM
NC
NO
COM
NC
NC
COM
NO
7
8
NC
COM
NO
M7425A
LOAD 1
L1
(HOT)
L2
1
24 VAC
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
FOR T775B,D: CONNECT SENSOR B TO PINS 7 AND 8.
DIP SWITCHES FOR SENSOR SELECTION. PRESENT OF T775B,D ONLY.
1
2
3
2
2
3