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S8921D HOT SURFACE IGNITION MODULE
PLANNING THE INSTALLATION
WARNING
Fire Or Explosion Hazard.
Can Cause Property Damage,
Severe Injury, Or Death.
Follow these warnings exactly:
• Review the installation as outlined in this
section.
• Plan for frequent maintenance as described in
the Maintenance section.
When hot surface ignition systems are used on heating
equipment in barns, greenhouses, and commercial
properties and on heating appliances such as commer-
cial cookers, agricultural equipment, industrial heating
equipment and pool heaters, heavy demands are made
on the controls. Special steps may be required to prevent
nuisance shutdowns and control failure due to frequent
cycling, severe environmental conditions related to
moisture, corrosive chemicals, dust or excessive heat.
These applications require Honeywell Home and
Building Control Engineering review; contact your
Honeywell Sales Representative for assistance.
Review the following conditions that can apply to your
specific installation and take the precautionary steps
suggested.
Frequent Cycling
These controls are designed for use on appliances that
typically cycle only three to four times an hour during the
heating season. In year-round applications with greater
cycling rates, the control can wear out more quickly.
Perform a monthly checkout.
Water or Steam Cleaning
If a module or gas control gets wet, replace it. If the
appliance is likely to be cleaned with water or steam,
protect (cover) the controls and wiring from water or
steam flow. Mount the controls high enough above the
bottom of the cabinet to avoid getting wet during normal
cleaning procedures. NEMA 4 enclosure is recom-
mended for the ignition module; see the Electronic
Ignition Service manual, 70-6604.
High Humidity or Dripping Water
Dripping water can cause the module to fail. Never install
an appliance where water can drip on the controls.
In addition, high ambient humidity can cause the gas
control to corrode and fail.
If the appliance is in a humid atmosphere, make sure air
circulation around the controls is adequate to prevent
condensation. Also, regularly check out the system. NEMA
4 enclosure is recommended for the ignition module; see
the Electronic Ignition Service manual, 70-6604.
69-0924—2
Corrosive Chemicals
Corrosive chemicals can attack the module and gas
control, eventually causing a failure. If chemicals are used
for routine cleaning, avoid contact with the controls. Where
chemicals are suspended in air, as in some industrial or
agricultural applications, NEMA 4 enclosure is recom-
mended for the ignition module; see the Electronic Ignition
Service manual, 70-6604.
Dust or Grease Accumulation
Heavy accumulations of dust or grease can cause controls
to malfunction. Where dust or grease can be a problem,
provide covers for the module and the gas control to limit
contamination. NEMA 4 enclosure is recommended for the
ignition module; see the Electronic Ignition Service
Manual, 70-6604.
Heat
Excessively high temperatures can damage controls.
Make sure the maximum ambient temperature at the
control does not exceed the rating of the control. If the
appliance operates at very high temperatures, use
insulation, shielding, and air circulation as necessary, to
protect the controls. Proper insulation or shielding should
be provided by the appliance manufacturer; verify proper
air circulation is maintained when the appliance is
installed.
INSTALLATION
When Installing this Ignition System...
1. Read these instructions carefully. Failure to follow
them could damage the components or cause a
hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
the application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out component
and appliance operation as provided in these
instructions.
WARNING
Fire Or Explosion Hazard.
Can Cause Property Damage,
Severe Injury, Or Death.
If the ignition module gets wet, it can malfunction,
leading to accumulation of explosive gas.
• Never install where water can flood, drip or
condense on the module.
• Never use a module that has been wet.
Replace it.
• Liquefied petroleum (LP) gas is heavier than air
and will not vent upward naturally.
• Do not light pilot or operate electric switches,
lights or appliances until you are sure the
appliance area is free of gas.
• Do not attempt to disassemble or clean the
module. Improper reassembly and cleaning can
cause unreliable operation.
2
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