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S8921D HOT SURFACE IGNITION MODULE
BURNER
THERMOSTAT
GROUND
ROLLOUT
LIMIT
FUSE
SWITCH
Wire the Module
CAUTION
Hazardous Voltage.
Can Cause Personal Injury
Or Equipment Damage.
• Disconnect the power supply before installing or
servicing.
• Check the wiring diagram furnished by the
appliance manufacturer, if available. Carefully
follow the instructions and procedures outlined
in this section.
IMPORTANT:
1.
All wiring must comply with applicable
electrical codes and ordinances.
2.
Hot surface igniter leadwires should not be
allowed to rest against grounded metal
surfaces.
3.
A common ground is required for the S8921D
and the main burner. The 24V (GND) terminal
internally grounds one side of the transformer.
Any auxiliary safety controls or limits must not
be in the grounded leg of the transformer.
4.
Make sure the transformer has adequate VA.
The ignition module requires 0.4A at 24 Vac.
Add the current draws of all other devices in
the control circuit, including the pilot and main
valves in the gas control, and multiply by 24 to
determine the total VA requirement of these
components. Add this total to 9.6 VA (for the
ignition module). The result is the minimum
transformer VA rating. Use a Class II trans-
former when replacement is required.
5.
Check that L1 (hot) and L2 (neutral) are wired
to the proper terminals at the appliance and at
the S8921D. The S8921D is not sensitive to
line voltage polarity for flame sensing.
However, proper L1 and L2 wiring helps to
minimize the potential electrical shock hazard.
69-0924—2
S8921D HOT SURFACE IGNITER CONTROL
AIR PROVING
SWITCH
GAS VALVE
SYSTEM
CONTROL
TRANSFORMER
Fig. 2. Typical wiring diagram for the S8921D.
FUSE
INTERLOCK
To Wire the Module:
1. Connect the wires to the S8921D Ignition Module as
shown in Fig. 2. Make sure that adequate system
ground is provided. Where a change in quick-
connect is required, cut off the original quick-
connect, strip the leadwire and firmly crimp in place
a new quick-connect.
2. Verify the thermostat anticipator setting as explained
in the preceding Important, item 4.
STARTUP AND CHECKOUT
Check out the gas control system:
• At initial installation of the appliance.
• As part of regular maintenance procedures.
• At maintenance intervals determined by the application.
• As the first step in troubleshooting.
• Any time work is done on the system.
Maintenance frequency must be determined individually
for each application; see Maintenance section.
WARNING
Fire Or Explosion Hazard.
Can Cause Property Damage,
Severe Injury, Or Death.
• If you smell gas or suspect a gas leak, turn off
gas at manual service valve and evacuate the
building.
• Do not try to light any appliance; do not touch
any electrical switch or telephone in the building
until you are sure no spilled gas remains.
• Gas leak test must be done as described in the
following steps 1 and 6 for initial installation and
any time work is done involving the gas piping.
4
FLAME
SENSOR
COMBUSTION
BLOWER
IGNITER
ELEMENT
L2 (N)
TO 120 VAC
POWER SUPPLY
L1 (H)
M7595
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