Honeywell S8910U User Manual

Fig. 6. Typical hookup when S8910U replaces Honeywell S89/S890.
STARTUP AND CHECKOUT
WARNING
FIRE OR EXPLOSION HAZARD. CAN CAUSE PROPERTY DAMAGE, SEVERE INJURY, OR DEATH.
1. If you smell gas or suspect a gas leak, turn off gas at the 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.
2. Perform a gas leak test, as described in Steps 1 and 6 in the Startup and Checkout section, for initial installation
and any time work is done involving the gas piping.
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.
Determine maintenance frequency individually for each application; see Maintenance section.

Honeywell S8910U Specifications

General

Brand	Honeywell
Model	S8910U
Category	Control Unit
Language	English

Summary

APPLICATION

REVIEW THE INSTALLATION

INSTALLATION

Mount New Ignition Module

Guidance on mounting the new S8910U module, considering environmental factors and orientation.

Install Selection Tab

Wire the Module

Instructions on how to correctly wire the S8910U ignition module.

STARTUP AND CHECKOUT

Gas Leak Test

Check Safety Lockout Operation

MAINTENANCE

OPERATION

Purge/Prepurge

Igniter Warmup

Trial for Ignition

Explains the ignition trial time and flame sensing process for burner ignition.

Burner Operation

Describes how the flame sensor detects flame and holds the gas control open.

Safety Shutdown

Explains safety shutdown procedures for one-trial and three-trial systems.

TROUBLESHOOTING

Status LED Used to Troubleshoot

Explains how to use the status LED to diagnose system status and errors.

Ignition System Checks

Guides for checking the igniter wire harness, grounding, and flame sensing circuit to troubleshoot issues.