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R7426A,B,C,D TEMPERATURE AND UNIVERSAL INPUT CONTROLLERS
UNOCCUPIED
MAIN
TEMPERATURE
SENSOR
OCCUPIED
IO1
LIMIT OR
+
–
CASCADE
CPA/SPA
SENSOR
+
1
2
3
4
5
R7426A
15
16
17
18
19
L1
(HOT)
1
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
TERMINALS 13 AND 14 ARE A SERIAL INTERFACE FOR A PANEL BUS.
3
RELATIVE HUMIDITY INPUT IS EQUAL TO 200 mV DIVIDED BY PERCENT RH.
UNOCCUPIED
MAIN
TEMPERATURE
SENSOR
IO1
LIMIT OR
OCCUPIED
+
–
CASCADE
SENSOR
CPA/SPA
IO2
+
1
2
3
4
5
R7426C
15
16
17
18
19
HUMIDITY
XWRH
SENSOR
+
–
3
L1
(HOT)
1
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
TERMINALS 13 AND 14 ARE A SERIAL INTERFACE FOR A PANEL BUS.
OPERATION
Main Temperature Control
The controller compares the actual temperature value
measured by the main sensor (I01) with the calculated setpoint
(CTRP1) and generates a proportional (X
plus integral (X
) deviation signal. CTPR1 is the sum of the
wi
compensation effect, the CPA and the unoccupied offset.
63-2565
COMPENSATION
FREEZE
SENSOR
PROTECTION
IO3
OFF
+
–
ON
PLANT/
SYSTEM
OFF
IO2
–
ON
6
7
8
9
10
11
12
O1
CLOSE
OPEN
OUT
OUT
20
21
22
23
24
25
26
HONEYWELL
SERIES 61
ACTUATOR
Fig. 2. R7426A,B typical wiring.
COMPENSATION
FREEZE
SENSOR
PROTECTION
IO3
OFF
+
–
PLANT/
ON
SYSTEM
OFF
–
ON
6
7
8
9
10
11
O1
O2
0/2 TO
0/2 TO
10 Vdc
10 Vdc
OUTPUT
OUTPUT
+
–
+
–
20
21
22
23
24
25
HONEYWELL
HONEYWELL
SERIES 70
SERIES 70
ACTUATOR
ACTUATOR
Fig. 3. R7426C,D typical wiring.
) or proportional
w
UNOCCUPIED
MAIN
TEMPERATURE
SENSOR
OCCUPIED
IO1
+
–
CPA/SPA
2
1
2
3
4
13
14
R7426B
27
28
15
16
17
18
HUMIDITY
X
WRH
SENSOR
+
–
3
L1
(HOT)
1
L2
CPA/
SPA
IO1
+
–
2
12
13
14
1
2
3
4
R7426D
O3
0/2 TO
10 Vdc
OUTPUT
+
–
15
16
17
18
26
27
28
4
HONEYWELL
SERIES 70
L1
ACTUATOR
(HOT)
L2
1
3
RELATIVE HUMIDITY OUTPUT (Xw). EQUAL TO 200 mV DIVIDED BY PERCENT RH.
4
RELATIVE HUMIDITY INPUT IS EQUAL TO 200 mV DIVIDED BY PERCENT RH.
NOTE: All diagrams show proportional control action only . If
P+I control is in operation heating and cooling slopes
are not defined.
4
COMPENSATION
FREEZE
SENSOR
PROTECTION
OFF
IO3
+
–
ON
LIMIT OR
PLANT/
CASCADE
SYSTEM
SENSOR
OFF
IO2
+
–
ON
5
6
7
8
9
10
11
12
O1
O2
CLOSE
OPEN
CLOSE
OPEN
CLOSE
OUT
OUT
OUT
OUT
OUT
19
20
21
22
23
24
25
26
HONEYWELL
HONEYWELL
SERIES 61
SERIES 61
ACTUATOR
ACTUATOR
COMPENSATION
FREEZE
SENSOR
PROTECTION
IO3
OFF
+
–
PLANT/
SYSTEM
ON
OFF
IO2
+
–
ON
5
6
7
8
9
10
11
O1
0/2 TO 10 Vdc
OUTPUT
+
–
19
20
21
22
23
24
25
RELAY
HONEYWELL
SERIES 70
ACTUATOR
2
13
14
O3
OPEN
OUT
27
28
HONEYWELL
SERIES 61
ACTUATOR
M17483
2
12
13
14
ON/OFF
OUTPUT
26 27
28
M17446
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