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- User manual
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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
HZ
EXH HP
MOP
PH
Unit’s Total MCA
Electrical Nameplate
2. Provide the Opening(s) for the Electrical
Connections
Voltage, Hertz, Phase
Electrical openings vary by unit size and arrangement and are field supplied.
PH
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.
DGX Industrial Space Heating 7
®
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Table of contents
- 3 Clearance to Combustibles/Service Clearances
- 4 Indoor Unit
- 5 Unit Arrangement DB / HZ
- 6 Diffuser
- 6 Remote Panel (TSCP)
- 7 Electrical Wiring
- 8 Gas Piping
- 9 Blower
- 11 Direct Gas
- 11 100% Outdoor Air
- 12 50/50 Recirculation
- 15 Electrical without 7-Day Timer
- 16 Electrical with 7-Day Timer
- 17 Blower
- 18 Motor
- 19 Insufficient Airflow / Too Much Airflow
- 20 Excessive Noise or Vibration
- 21 Heater
- 24 Routine
- 27 Gas Train Layout, 400-800 MBH
- 27 Gas Train Layout, > 800 MBH
- 28 Control Center Layout / Dirty Filter Switch
- 29 Start-Up Check List
- 30 Maintenance Log