Honeywell S8910U - INSTALLATION

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-around 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. A NEMA 4 enclosure is recommended for the ignition
module; see the Electronic Ignition Service Manual, form 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. A NEMA 4 enclosure is recommended for the ignition module;
see the Electronic Ignition Service Manual, form 70-6604.
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, A NEMA 4 enclosure is recommended for the ignition module; see the Electronic Ignition
Service Manual, form 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. A NEMA 4 enclosure is recommended for
the ignition module; see the Electronic Ignition Service Manual, form 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. Assure that proper insulation or shielding was
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 Tables 2, 3, and 4 to confirm that the S8910U is a direct replacement for the existing module.
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.
1. 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.
2. Liquefied petroleum (LP) gas is heavier than air and can 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.
3. Do not attempt to disassemble or clean the module. Improper reassembly and cleaning can cause unreliable
operation.