Aprilaire 1150 - Manual (Page 20)

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OM-4007
Fused
disconnect
Power
supply
FIGURE 14 – Line Power Wiring Requirements
WARNING
240 volts may cause serious injury or death from electrical shock. Shut off power at main breaker before
installing supply wiring for humidifier.
LINE POWER
The 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. Install a fused
quick disconnect box nearby the humidifier for easy access during
maintenance of humidifier. See
Figure 14.
208 VAC single-phase, 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 15. 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 15 – 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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