Greenheck DG / DGX Industrial Space Heating (464044 IOM) (Pre-2009) - Manual (Page 6)

I - 4
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.
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.
Installation - Electrical Wiring
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.
CAUTION!
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.
DANGER!
High voltage electrical input is needed for this
equipment. This work should be performed by a
qualified electrician.
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.
Step 1 Determine the Size of the Main
Power Lines
The unit’s nameplate states the voltage and the unit’s
total amps. The main power lines to the unit should
be sized accordingly. See figure #10.
Step 2 Provide the Opening(s) for the
Electrical Connections
Electrical openings vary by unit size and arrangement
and are field supplied.
MODEL
VOLTS
SUP HP
MARK
AMPS
HTZ PH
S/N
EXH HP
Voltage, Hertz,
and Phase
Unit’s Total
Amps
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!
Greenheck’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.
Step 5 Wire the Remote Panel (TSCP)
Reference the ladder diagram on the inside of the
control center door for correct wiring of the TSCP.
NOTE!
TSCP has number-to-number wiring to the
control center in the unit.
Figure 10.
Electrical Nameplate