Electrical Wiring - Greenheck DGX Installation, Operation And Maintenance Manual

Installation of Electrical Wiring
IMPORTANT
Before connecting power to the unit, read and
understand the following instructions and wiring
diagrams. Complete wiring diagrams are attached on
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.
CAUTION
If replacement wire is required, it must have a
temperature rating of at least 105ºC, except for
energy cut-off or sensor lead wire which must be
rated to 150ºC.
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.
DANGER
High voltage electrical input is needed for this
equipment. This work should be performed by a
qualified electrician.
CAUTION
Any wiring deviations may result in personal injury or
property damage. Manufacturer is not responsible
for any damage to, or failure of the unit caused by
incorrect final wiring.
IMPORTANT
Manufacturer's standard control voltage is 24 VAC.
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.
®
1. Determine the Size of the Main Power
Lines
The unit's nameplate states the voltage and the unit's
MCA. The main power lines to the unit should be sized
accordingly. The nameplate is located on the outside of
the unit on the control panel side.
Voltage, Hertz, Phase
VOLTS
SUP HP
MCA
Unit's Total MCA
Electrical Nameplate
2. Provide the Opening(s) for the Electrical
Connections
Electrical openings vary by unit size and arrangement
and are field supplied.
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.
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.
5. Wire Accessories
Reference the Ladder Diagram on the inside of the
control center door for correct wiring of the following
accessories:
• Summer/Off/Winter Switch
• Indicating Lights
• Dirty Filter Indicator
• Industrial Space Heat TSCP
NOTE
TSCP has number-to-number wiring.
HZ PH
EXH HP
MOP
DGX Industrial Space Heating 7