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Provide electronic control of intermittent pilot ignition systems used on gas-fired furnaces, boilers and other heating appliances.


  • Provide ignition sequences, flame monitoring and safety shutoff for intermittent pilot central furnaces and heating appliances.
  • Functional equivalent of S86, S860, and S90 modules. Include spark cable adapter to allow field replacement of S86, S860, and S90 without replacing existing spark cable.
  • Include relay contacts for use with any intermittent pilot gas control string with maximum 1.0A pilot and 2.0A main valve rating; VR8204, VR8304, or VR8440 combination gas control recommended. S8670D is for use with natural or LP gas; modules provide 100 percent pilot gas shutoff and lockout if pilot fails to light.

Product Specifications

Dimensions (in.)
3 15/16 in. high x 5 7/16 in. wide x 2 5/8 in. deep
Dimensions (mm)
100 mm high x 138 mm wide x 67 mm deep
Item Type
Electrical Ratings
24 Vac
60 Hz
Approvals, Canadian Standards Association
Design Certified
Flame Failure Response Time (sec)
2 seconds maximum
30 seconds
Ambient Temperature Range (C)
-40 C to +79 C
Ambient Temperature Range (F)
-40 F to +175 F
Ignition System Type
Intermittent Pilot
Ignition Sequence
Typical Gas Control
VR8204, VR8304
Type of Gas
Natural or LP
Flame Sense
Single Rod
Ignition Source
Internal high voltage spark generator
Ignition Trials To Lockout
Lockout Timing
15 seconds
Ignition Trial Time (sec)
15 sec.
Maximum Valve Load @ 24 Vac (Amps)
1A Pilot, 2A Main @ 24Vac
Typical Ignition Hardware
Q345, Q3451
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