Specifications

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Control input wiring

The internal controller offers four input control types, which are field adjustable. The factory default control type for Model 1150 is

the Automatic Steam Humidifier Control, on-off configuration as shown in Figure 20.

The factory default control type for Model 1160/1180 is the Automatic Steam Humidifier Control, modulating configuration as

shown in Figure 21.

IMPORTANT: For Model 1150 on/off control, verify that the shunt on the JP2 jumper is placed over the 2 & 3 position. For Model

1160/1180 modulating control, verify that the shunt on the JP2 jumper is placed over the 1 & 2 position.

To change the input control type on Model 1160/1180 to signal by others, see Figure 22 for a 0-10 VDC signal, and see Figure 23

for a 4-20 mA signal (input resistance 250 ohms).

IMPORTANT: Note the internal controller slide switch S1 settings in each control input wiring diagram.

90-917

FIGURE 21 – Model 1160/1180: Input Wiring for Automatic Steam Humidifier Control (modulating configuration)

90-916

FIGURE 20 – Model 1150: Input Wiring for Automatic Steam Humidifier Control (on/off configuration)

IMPORTANT:

LW420 controller board slide switch

S1 positions 1 and 2 are OFF

HIGH HUMIDITY

LIMIT SWITCH

AIRFLOW PROVING

SWITCH

STEAM HUMIDIFIER

FIELD WIRING

TERMINAL BLOCK

AUTOMATIC

STEAM

HUMIDIFIER

CONTROL

3-wire shielded cable with ground

2-wire shielded

cable with

ground

1+ 1-

24V

H+

H-

ODT

Serial communication

to Aprilaire Model 8570

thermostat (optional)

To outdoor temperature sensor

Set jumper to 2 and

3 position for on/off

configuration

JP2

1 2 3

Enable

+24VDC

Command signal

Common