Honeywell T775 Series 2000 Application Manual page 34

T775 SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
T775M2030 Replacement for W973A
Logic Panel (continued)
OPTIONAL
CHANGEOVER
POTENTIOMETER
1 HONEYWELL
ELECTRONIC
MODUTROL
L1 (HOT)
L2
1 OTHER MOTORS SUCH AS 4-20 MA, 0-10 VDC, AND 2-10 VDC, MAY BE USED.
2 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
3 USE SEPARATE TRANSFORMER FOR T775M WHEN USING 24 VAC.
4 A 250 OHM RESISTOR PROVIDES 40% AUTHORITY WHEN USING A 150 OHM MINIMUM POSITION POTENTIOMETER.
5
INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.
6 POWER WITH 24 VAC OR 120/240 VAC AT THE APPROPRIATE TERMINAL BLOCK.
7
24 VAC POWER TERMINAL BLOCK.
Fig. 43. T775M2030 wiring connections for replacing a W973A Logic Panel.
NOTE: The T775M2030 Replacement for W973A Logic Panel continues on the next page.
63-7147—05
HONEYWELL ELECTRONIC SERIES 90 MODUTROL MOTOR
SPDT
T1 T2
(H705)
POWER
4
OUTPUT
MINIMUM
POSITION
(Q209)
SERIES 90
MOTOR
3
T675A COMPRESSOR
LOCKOUT
COOL 2
HEAT 1
HEAT 2
COOL 1
NOTE: Fig. 43 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.
HEATING
2
B R W
SENSOR A (ROOM)
3
–
C T
B +
S
T
MOD 1
–
R
V
5
+
W
T
B
T
MOD 2
–
R
T775M2030
5
+
W
7
+
C
RELAY RELAY
4 3
NC
NC
COM
C
C
NO
NO
NO
NO
NO
COM
C
NC
RELAY RELAY
1
34
1
SENSOR B (DISCHARGE)
6
120 VAC
NO
C
NC
2
NO
COM
COM
NO
M28012