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TPI CORPORATION

P.O. Box 4973, CRS

Johnson City, TN 37602-4973

FORM: 9459

OPERATING INSTRUCTIONS

UTILITY UNIT HEATERS 680 SERIES

MODEL NO

WATTS

BTUH

VOLTS

60 HZ

LINE AMPS

PLUG

ON CORD SET

HF684TC

4000/3000

13,562/10,239

240/208

16.7/14.4

20AMP

HF685TC

4800/3600

16,393/12,295

240/208

20.0/17.3

30AMP

HF686TC

5600/4200

19,113/14,335

240/208

23.3/20.2

30AMP

CAUTION

Check heater voltage and phase on data tape on back of heater to make sure they are the same as the electrical service 

supplied.  Heater coded with “HF” will operate on either 240 or 208 volts.  High Temperature, Keep Electrical Cords, Drapery, 

And Other Furnishings At Least 0.9M (3 ft.) Away From The Front, Side And Rear Of Heater.

INSTALLATION INSTRUCTIONS

Be sure that the electrical receptacle is of the configuration and capacity appropriate for the heater.  The heater may be 

used as a heavy duty portable.  It may also be hung on the wall or ceiling by loosening the vertical adjustment knobs on 

each side of the heater and swinging the cradle to a position where the “bottom” of the cradle is to the rear or above the 

heater.  The heater may be hung to the wall or ceiling using the keyhole slots in the base or holes provided for threaded rod 

(supplied by others).  The wall/ceiling hanging structure and anchoring provisions must be of sufficient strength to support 

the combined weight of the heater and hanging bracket.  To facilitate hanging of the heater, it may be removed from the 

cradle and replaced after the cradle is hung.  The proper receptacle can be installed adjacent to the hanging location.  

OPERATION

To operate heater, turn thermostat knob as far as it will go in a clockwise direction.  When temperature reaches desired 

comfort level, slowly turn thermostat counterclockwise until heater shuts off.  One or two minor adjustments may be necessary 

as the heat becomes better distributed throughout the area.

MAINTENANCE

Heaters are equipment with a permanently lubricated motor and, therefore, no maintenance other than occasional cleaning 

is required.

“WHEN CLEANING OR DISASSEMBLING HEATER, BE SURE TO DISCONNECT HEATER CIRCUIT.”

THERMAL CUTOFF DEVICE

All heaters are equipped with a thermally actuated manual reset limit control which automatically disconnects heating element 

and motor in the event normal operating temperatures are exceeded.  If heater should fail to operate with thermostat turned 

clockwise to its limit, disconnect heater and wait a few minutes allowing heater to cool.  Using a small straight object such 

as a pencil, push in button located inside small hole marked RESET.  The thermal cutout almost invariably indicates a partial 

or complete blockage of the air intake or exit.  Be sure to keep these areas clear in order to allow proper circulation of air.

30 Amp Plug Configuration2

0 Amp Plug Configuration

NEMA #6-30PN

EMA #6-20P

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