Greenheck DG/DGX Pilot Ignition (470651_IOM) - Manual (Page 7)

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 Electric 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
high voltage wiring running through the unit in the
airstream must be protected by metal conduit, metal
clad cable or raceways.
CAUTION
If replacement wire is required, it must have a
temperature rating of at least 105ºC, except for an
energy cut-off or sensor lead wire which must be
rated to 150ºC.
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.
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).
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 the Optional Accessories
Reference the Ladder Diagram on the inside of the
control center door for correct wiring of the following
optional accessories:
• Selectra Stat
• Room Override
• Blower Switch
• Heat Switch • Indicating Lights
• Dirty Filter Indicator
• TSCP
• KSCP
NOTE
Wiring to the Selectra Stat should be in separate
conduit or run with shielded cable.
NOTE
TSCP has number-to-number wiring.
NOTE
Large evaporative coolers may require a separate
power supply.
6. Wire the Optional Evaporative Cooler
Reference the Ladder Diagram on the inside of the
control center door for correct wiring of the pump and
the optional auto-drain and flush.
SUP HP
MCA
EXH HP
MOP
VOLTS HZ PH
Unit’s Total MCA
Voltage, Hertz, Phase
SUP HP
MCA
EXH HP
MOP
VOLTS HZ PH
Voltage, Hertz, Phase
Electrical Nameplate
Model DG / DGX Pilot Ignition Make-Up Air 7
®