T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
63-7147—3
30
T775M2030 Replacement for W973A Logic
Panel (continued)
NOTE: Fig. 35 is for wiring purposes only. A thorough review
of the existing W973A application is required in order
to determine the capability of the T775 controller
replacement.
Fig. 35. T775M2030 Wiring Connections for Replacing a W973A Logic Panel.
NOTE: The T775M2030 Replacement for W973A Logic Panel continues on the next page.
M28012
POWER
OUTPUT
HONEYWELL ELECTRONIC SERIES 90 MODUTROL MOTOR
2
3
5
MOD 1
1
HEATING
OTHER MOTORS SUCH AS 4-20 MA, 0-10 VDC, AND 2-10 VDC, MAY BE USED.
TO VERIFY OUTPUT, TEST OPEN CIRCUIT VOLTAGE BETWEEN THE MOD 1 TERMINALS W AND R.
- MINIMUM (DRIVE CLOSED) SIGNAL LESS THAN 0.17 VDC
- MAXIMUM (DRIVE OPEN) SIGNAL IS GREATER THAN 1.7 VDC
USE SEPARATE TRANSFORMER FOR T775M WHEN USING 24 VAC.
A 250 OHM RESISTOR PROVIDES 40% AUTHORITY WHEN USING A 150 OHM MINIMUM POSITION POTENTIOMETER.
INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.
POWER WITH 24 VAC OR 120/240 VAC AT THE APPROPRIATE TERMINAL BLOCK.
24 VAC POWER TERMINAL BLOCK.
1
2
3
5
4
T1
T2
B
W
R
4
HONEYWELL
ELECTRONIC
SERIES 90
MODUTROL
MOTOR
W
R
B
MINIMUM
POSITION
POTENTIOMETER
(Q209)
SPDT
CHANGEOVER
(H705)
3
5
COO
LING
MOD 2
1
OPTIONAL
B
R
W
+
–
C
S
V
T
T
–
+
C
+
SENSOR A (ROOM)
C
NO
NC
C
NO
NC
C
NC
NO
C
NC
NO
COM
NO
COM
NO
RELAY
3
RELAY
2
RELAY
1
RELAY
4
120
COM
240
B
R
W
+
–
T
T
T775M2030
SENSOR B (DISCHARGE)
L1 (HOT)
L2
COM
NO
COM
NO
HEAT 1
T675A
HIGH LIMIT
T675A COMPRESSOR
LOCKOUT
HEAT 2
COOL 1
COOL 2
6
120 VAC
6
7
7
B
W
R
T1 T2
