Greenheck DGX Installation, Operation And Maintenance Manual page 8

Before connecting power to the unit, read and understand the following instructions and wiring
diagrams. Complete wiring diagrams are attached to the inside of the control center door(s).
IMPORTANT!
All wiring should be done in accordance with the
latest edition of the National Electrical Code
ANSI/NFPA-70 and any local codes that may
apply. In Canada, wiring should be done in
accordance with the Canadian Electrical Code.
IMPORTANT!
The equipment must be properly grounded.
Any wiring running through the unit in the
airstream must be protected by metal conduit,
metal clad cable or raceways.
Any wiring deviations may result in personal injury or property damage. Greenheck is not responsible
for any damage to, or failure of the unit caused by incorrect final wiring.
Control wire resistance should not exceed 0.75 ohms (approximately 285 feet total length for 14 gauge
wire; 455 feet total length for 12 gauge wire). If the resistance exceeds 0.75 ohms an industrial-style,
plug-in relay should be wired in place of the remote switch. The relay must be rated for at least 5
amps and have a 24 VAC coil. Failure to comply with these guidelines may cause motor starters to
chatter or not pull in, resulting in contactor failures and/or motor failures.
Step 1 Determine the Size of the Main
Power Lines
The units nameplate states the voltage and the unit's
total amps. The main power lines to the unit should
be sized accordingly. See figure #18. The nameplate
is located on the outside of the unit on the control
panel side.
Step 2 Provide the Opening(s) for the
Electrical Connections
Electrical openings vary by unit size and arrangement
and are field supplied.
Step 3 Connect the Main Power
Connect the main power lines to the disconnect switch and main grounding lug(s). Torque field connections to
20 in-lbs. See the control center layout in the reference section for main disconnect and grounding lug(s)
locations.
Step 4 Wire the Optional Convenience Outlet
The convenience outlet requires a separate 115V power supply circuit. The circuit must include short circuit
protection which may need to be supplied by others.
Installation - Electrical Wiring
IMPORTANT!
CAUTION!
IMPORTANT!
Greenheck's standard control voltage is 24 VAC.
CAUTION!
If replacement wire is required, it must have a
temperature rating of at least 105°C, except for
energy cut-off or sensor lead wire which must be
rated to 150°C.
DANGER!
High voltage electrical input is needed for this
equipment. This work should be performed by a
qualified electrician.
Unit's Total
Amps
MODEL
VOLTS HTZ
AMPS
SUP HP
MARK
Figure 18. Electrical Nameplate
8
Voltage, Hertz,
and Phase
PH
S/N
EXH HP