Aprilaire 1150 Installation, Operation And Maintenance Manual page 20

fIgURE 14 – Steam Humidifier wiring and Utility Diagram
INPUT POwER
with ground.
Refer to wiring
STEAM
diagram .
OUTlET
Aprilaire Model 1150/1160/1180
Steam Humidifier
DRAIN wATER OUT
¾" COPPER or 1" HOSE
Field Wiring Terminal Block Designations
Command Signal Normally Closed, Common, &
1 NC
Normally Open relay terminals
2 Enable Input
O
for optional blower control by
+24 VDC
30 NO
humidifier or remote fault alarm
20
1 2 30 NC O NO C
fIElD
????? ???? ????? ??????
wIRINg Steam Fill Drain On/Off
TERMINAl
blOCK
SUPPly wATER IN
¼" COMPRESSION FITTING
High Voltage Wiring
Low Voltage Wiring
1+ 1- 24V C H+ H- ODT
2 wire shielded
cable with
ground shield
connected to C
3 wire shielded cable
with ground shield
connected to C
C NO NC
Automatic Steam
Humidifier Control
Terminal Designations
1+, 1- Serial Communications
(for optional devices)
H+ Command Signal to
Humidifier
H- Command Signal to
Ground (not used)
To Outdoor
Temperature
Sensor
Airflow Proving
C
Switch
NO
Connect ¼" plastic
NC
tubing from H (High)
side of proving switch
to the airflow sensing
probe located 1 .5 duct
diameters downstream
of blower . Leave L
(Low) side open to
atmosphere .
High Humidity
limit Switch
Switch will be closed
below high limit set
point
90-928