Specifications

OM-4049
Fused
disconnect
Power
supply
FIGURE 18 – Line Power Wiring Requirements
WARNING
Line voltage may cause serious injury or death from electrical shock. Shut off power at main breaker before
installing supply wiring for humidifier.
LINE POWER
The 1150/1160 humidifier is designed for 240 VAC, single phase,
50/60 Hz input power. The Model 1150 requires a 25 amp (minimum)
breaker while the Model 1160 requires a 45 amp (minimum) breaker.
The Model 1180 is designed for 240 VAC, three phase, 50/60 Hz input
power. The Model 1180 requires a 50 amp (minimum) breaker. Install
a fused quick disconnect box nearby the humidifier for easy access
during maintenance of humidifier. See Figure 18.
208 VAC, 50/60 Hz input power may also be used. Note that when
using 208 VAC the steam capacity of each unit will be reduced by
approximately 25% compared to rated capacity at 240 VAC.
Line power grounding requirements
The ground connection must be made with solid metal to metal
connections. The ground must be a good radio frequency earth.
Ground wire should be the same size as power wiring.
Proper control wiring prevents electrical noise.
Electrical noise can produce undesirable effects on electronic
control circuits, which affects controllability. Electrical noise
is generated by electrical equipment such as inductive
loads, electric motors, solenoid coils, welding machinery, or
fluorescent light circuits. The electrical noise or interference
generated from these sources (and the effect on controllers)
is difficult to define, but the most common symptoms are
erratic control or intermittent operational problems.
IMPORTANT
• For maximum electromagnetic compatibility effectiveness,
wire all humidity, high limit, and airflow controls using
multicolored shielded plenum-rated cable with a ground
wire for the shield. Connect the ground wire to the
C terminal on the field wiring terminal block in the
humidifier. See Figure 19. Use wire less than 2” (50 mm)
in length for the shielded cable ground wire.
• Do not ground shield at the device end.
C terminal
FIGURE 19 – Shielded Cable Wire Connection to C Terminal
CONTROL WIRING
OM-4015
WARNING
Failure to properly ground unit may result in property damage due to fire, or serious injury or death from
electrical shock.
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