L.B. White AW250(building controller) - Manual (Page 12)

■
Use customer supplied 1/4 insulated female terminals
when interconnecting the building’s environment
controller to the heater.
■
Use 18 gauge electrical wiring for supply of DC volts or
milliamp signal from building controller to signal
conditioner.
1. Open the heater’s control box for access to signal
conditioner. See Fig.7 for location.
FIG. 7
2. Remove the strain relief at the back of the control box.
All wiring from the building controller to the signal
conditioner will be routed through this hole. Reinstall
the strain relief around all wiring after connections have
been made.
A. Connecting heater to building controller with 0-10 VDC
signal. See Fig.8.
a. Connect the positve (+) lead of building controller
to the resistor connected at signal conditioner.
b. Connect the negative lead from building controller to
the terminal marked negative (-) on conditioner.
FIG. 8
B. Connecting heater to building controller with 4-20
milliamp output signal.
a. Remove the resistor from the positve (+) terminal
of the signal conditioner. Discard the resistor. See
Fig.8.
b Connect postive and negative wiring from the
building controller to the positive and negative
terminals of the signal conditioner.
C. See Fig. 9 for typical connections, two heaters per zone.
FIG. 9
INTERCONNECTION FOR VARIABLE HEAT
RESISTOR:
+
12
STRAIN RELIEF
SIGNAL CONDITIONER
1 2 3 4 5 6
HEATER 2
ZONE 1 OR ZONE 2 CONNECTIONS
FROM BUILDING CONTROLLER
TO SIGNAL CONDITIONER IN HEATER
* RESISTOR: USE
ONLY WITH 0-10 VDC
SIGNAL. REMOVE
WHEN USING 4-20 mA
SIGNAL
* *
+ +
1 2 3 4 5 6
HEATER 1