HM750A1000
33-00289EF—03 12
ELECTRICAL
Wiring to be performed by a licensed electrician.
Installation on a GFCI circuit is recommended.
Do not remove the cover when the humidifier
powered.
Equipment Damage Hazard
Failure to wire the humidifier in accordance with
the wiring instructions may cause permanent
damage to the product and will void the warranty.
Voltage Selection
To select the correct voltage (120 VAC or 240 VAC), ensure
that the jumper is properly placed between the
appropriate terminals of the humidifier control board. The
HM750 is factory-configured for 240 VAC. If the
humidifier will run on a 120 VAC circuit, move the jumper
to the 120 VAC terminals as seen in Fig. 20.
Fig. 20. Voltage selection jumper on
humidifier control board.
Connecting Power
Requirements
• 12 AWG or 14 AWG wire
• Dedicated 15 amp, 120/240-volt circuit (a GFCI circuit
is recommended)
• Disconnect switch (optional. The use of a disconnect
switch between the humidifier and the circuit breaker is
recommended and will be useful for future servicing.).
To comply with UL product listing, the HM750
must be hardwired to a dedicated 15 amp circuit.
All wiring must be done per governing electrical
codes. Failure to do so will void the product
warranty.
The use of electric cord plugs can cause
overheating and result in risk of damage to
property and/or personal injury.
Wiring Procedure
1. Install a disconnect switch between the humidifier
and the circuit breaker as shown in Fig. 21 and Fig.
22 (optional).
2. Route the power supply wire through the strain relief
located at the top of the red electrical box.
3. Connect the power wires to MAIN SUPPLY
terminals (L1, L2/N, and GND) on the humidifier
control board.
Fig. 21. 120 VAC (1 Phase) primary power connection.
Fig. 22. 240 VAC (1 Phase) primary power connection.
NOTES:
— Resideo recommends the use of a GFCI circuit
on this device to protect the homeowner from
electrical shock.
— Ensure that adequate power is available to
carry full humidifier amp draw as indicated on
the specification label.
— Do not use neutral wire as a ground; connect a
dedicated ground to ground termination.
— All wiring to be in accordance with national
and local electrical codes.
240VAC
120VAC
M36944
M37206
HM750
Status
Service
Power
Idle
Filling
Humidifying
Draining
Cylinder
Fault
Drain
Fault Codes In Front Cover
MAIN SUPPLY
L1
L2/N
GND
(OPTIONAL)
OFF ON
M36861A
HOT
NEUTRAL
GROUND
MAIN SUPPLY
L1
L2/N
GND
(OPTIONAL)
OFF ON
M36862A
HOT
HOT
GROUND
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