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Compatibility Guide for Safety and Temperature Controls
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Johnson engineers have developed special automatic temperature and safety control systems for Johnson Furnaces. Each system has been designed to provide accurate temperature control and safe operation at minimum cost.
 
A specific control system has been custom-designed for each furnace. Because furnaces vary in their design, function and temperature range, the types of controls required for individual furnaces will also vary. The graph below indicates the types of controls used with each individual furnace.

Johnson
Sets of Temperature and Safety Control Equipment

Furnace and System Components:

Furnace Number System Components
70, 120, 121, 142, 142SL, 142DL, 143, 125, 125SL Indicating Pyrometer Package:

Simpson Pyrometer Scale 0-2400° F., chromel alumel straight type thermocouple, 10' lead wire, thermocouple flange.

With platinum rhodium thermocouple for use above 2000° F.

Automatic Temperature and Ultra-Violet Safety Controls:

Fuji Control Scale 32°-2400° F., chromel alumel straight type thermocouple, 10' lead wire and solenoid valve.

Ultra-Violet flame scanner, air switch, flame relay, ignition relay, pressure regulator, shut off valve, electric ignition system with stop-start station. Safety system price included with furnace--Automatic temperature control package extra.

With platinum rhodium thermocouple for use above 2000° F.

654, 706, 706SL, 150, 175, 175SL, 127, 127SL Indicating Pyrometer Package:

Simpson Pyrometer Scale 0-2400° F., chromel alumel straight type thermocouple, 10' lead wire, thermocouple flange.

Automatic Temperature and Safety Controls:

Fuji Control Scale 32°-2400° F., straight type chromel alumel thermocouple, 10' lead wire, solenoid valve and thermocouple flange. Baso Safety valve, pilot burner and thermocouple. Safety price included with furnace--Automatic temperature controls extra.

536, 536A, 537, 537A, 538, 538A, 546, 546A, 547, 547A Automatic Temperature and Safety Controls: (Included in price of furnace)

Fuji control. Baso valve, thermocouple and pilot.

539, 539A, 540, 540A, 541, 541A, 542, 542A, 543, 543A Automatic Temperature and Safety Controls: (Included in price of furnace)

Fuji Control Scale 32°-2400° F., 10' lead wire, angle type chromel alumel thermocouple, 18" cold leg. 12" hot leg. Baso switch, Baso thermocouple, solenoid valve.

568, 569, 580, 581, 565, 565A, 575, 575A, 575B, 528, 529, 530, 531, 532, 533, 535 Indicating Pyrometer Package:

Simpson Pyrometer Scale 0-2400° F., angle type chromel alumel thermocouple, 10' lead wire, thermocouple bracket.

Automatic Temperature and Safety Controls:

Fuji Control Scale 32°-2400° F., angle type chromel alumel thermocouple, 10' lead wire, solenoid valve and thermocouple flange. Ultra-Violet safety system. Safety price included with furnace--Automatic temperature controls extra.

379, 313, 616 Automatic Temperature and Safety Controls:

Fuji Control Scale 32°-2400° F., chromel alumel thermocouple, with 8" hot leg with cast iron protection tube, solenoid valve and 10' lead wire. Baso safety valve, pilot burner and thermocouple.

527, 719, 721, 725, 726 Automatic Temperature and Safety Controls:

Fuji Control Scale 32°- 2400° F., 10' lead wire, angle type chromel alumel thermocouple with cast iron protection tube, solenoid valve. Ultra-Violet safety system. Safety price included with furnace--Automatic temperature controls extra.

718, 720, 724, 526 Automatic Temperature and Safety Controls:

Fuji Control Scale 32°-2400° F., angle type chromel alumel thermocouple with cast iron protection tube, solenoid valve. Baso switch, Baso thermocouple with pilot. Safety price included with furnace--Automatic temperature controls extra.

900, 900SS, 920, 950 Indicating Pyrometer Only:

Simpson w/Thermocouple and 25' lead wire.

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