Honeywell T775 Series 2000 Application Manual page 39

T775L Replacement for S984 Step
Controller (continued)
DIGITAL INPUT
(HEAT/COOL CHANGEOVER)
2 T6031 OR T675A
L1
(HOT)
24 VAC
L2
COOL 2
COM
NO
NO
HEAT
COM
1
HEAT
2
COOL 1
Fig. 47. T775L wiring connections for replacing a S984 Step Controller.
In this replacement application, the T775L provides the following, as described in Table 4:
SENSOR A (C7100D1001)
SENSOR B (SPACE OR OUTDOOR TEMPERATURE)
T
T
T775L
T
T
1
–
+
–
+
4
+
C
RELAY RELAY
4 3
NC
NC
C
C
NO
NO
NO NO
C
C
NC
NC
RELAY RELAY
1 2
COM
NO
1 T775 BUS TERMINALS PROVIDE WIRING CONNECTIONS TO/FROM T775L AND T775S.
SETUP THE CONTROL (T6031 OR T765) SO THAT IT CLOSES ON A TEMPERATURE FALL.
2
3 POWER WITH 24 VAC OR 120/240 VAC AT THE APPROPRIATE TERMINAL BLOCK.
4 24 VAC POWER TERMINAL BLOCK.
T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
NOTE: Fig. 47 is for wiring purposes only. A thorough review
of the existing S984 application is required in order to
determine the capability of the T775 controller
replacement.
1
–
+
4
+
C
3
RELAY
8
NC
C
NO
NO
NO
COM
C
NC
RELAY
5
COM
NO
39
T775S
3
120 VAC
RELAY
7
NC
C
NO
NO
COOL 4
NO
COM
C
NC
RELAY
6
COOL 3
M28018
63-7147—05