Greenheck TSU Base Unit Manual (464441) - Manual (Page 6)

Make-Up Air Unit 6
®
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
MARK
EXH HP
AMPS
VOLTS
MODEL
HZ PH
Voltage, Hertz, Phase
S/N
Electrical Nameplate