Fig. 21. Controller wiring diagram (model PUL6438S shown) for typical AHU application. (For note 2, refer to Fig. 15.)
1
2
1
2
EARTH GROUND WIRE LENGTH SHOULD BE HELD TO A MINIMUM. USE THE HEAVIEST GAUGE WIRE AVAILABLE, UP TO
14 AWG (2.O MM
2
) WITH A MINIMUM OF 18 AWG (1.O MM
2
), FOR EARTH GROUND WIRE.
TO ASSURE PROPER ELECTRICAL CONTACT, WIRES MUST BE TWISTED TOGETHER BEFORE INSERTION INTO THE
TERMINAL BLOCK.
ANALOG OUTPUTS FROM SENSOR ARE 4 TO 20 mA SIGNALS. A 499 OHM 1% TOLERANCE (OR BETTER) PRECISION
RESISTOR IS REQUIRED TO DRIVE THIS AND OTHER 4 TO 20 mA SIGNAL DEVICES. PLACE THIS RESISTOR AS CLOSE
AS POSSIBLE TO THE DRIVEN DEVICE.
M29756
AO-1
DI-1
UI-1
UI-2
COM
24 VAC
24 VAC
COM
+
-
DO-1
DO-2
DO-3
DO-4
DO-8
UI-3
COM
3
COM
COM
COM
DISCHARGE
AIR TEMP
COM
UI-6
OUTDOOR
ENTHALPY
RETURN
ENTHALPY
20 VDC
20 VDC
3
499
2
COMP2
COMP 1
HEAT 2
HEAT 1
FAN
UI-4
499
SBUS1
SBUS2
AO-1
COM
AO-2
AO-3
COM
UI-1
COM
UI-2
UI-3
COM
UI-4
UI-5
COM
UI-6
DI-1
DI-2
COM
DI-3
20V DC
DI-4
NET-2
NET-1
SHLD
EGND
24 VAC
24VAC COM
DO-1
COM
DO-2
DO-3
DO-4
DO-5
COM
DO-6
COM
1
2
3 4 5 6
7 8
1 0 9 2 3 4 5 6 7 8 0 9
1 1 1 1 1 1 1 1 1 2 1
1 2 3 4 5 6 7 8 0 9
2 2 2 2 2 2 2 2 2 3 3
1 2 3 4 5 6 7 8 0 9
3 3 3 3 3 3 3 3 4
DO-7
DO-8
COM
LONWORKS-BUS
LONWORKS-BUS
DIP
SWITCH
S3 (TR23
AND TR24
ONLY.)
ON
SW1 SW2 SW3
DIP SWITCH S2
ON
SW1 SW2
DIP
SWITCH
S1
ON
SW1 SW2
DO NOT
CHANGE
THIS
SWITCH
POSITION.
1
11
10 9
8
7
65
4
3
2
12
GND
SENSOR
LON +
LON -
SETPT
LED
OVERRIDE
24 VAC
HUM
4
TR23-H
ONLY
DIP SWITCH S1 FOR HUMIDITY MODELS ONLY. SEE TR23 INSTALLATION INSTRUCTIONS, FORM NO. 62-0267,
FOR CONFIGURATION DETAILS.
4
UI-5
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