On the L7224U the High Limit, High Limit Differential, Low Limit, and Low Limit Differential can be adjusted to the settings recommended by the boiler OEM. Adjusting Settings To discourage unauthorized changing of Aquastat® settings, a procedure to enter the adjustment mode is required. To enter the adjustment mode, press the UP, DOWN, and I buttons simultaneously for three seconds. Press the I button until the feature requiring adjustment is displayed: . HL.High Limit. . LL.Low Limit. . Ldf.Low

Introducing TrueZONE™ — the next generation of zoning panels from Honeywell. If you’ve ever installed a zoning system by setting manual dip switches, you’ll appreciate the simplicity, convenience and time savings that TrueZONE offers. TrueZONE helps eliminate callbacks by ensuring that the system is operating properly before the installer leaves the job site. It all adds up to true comfort for your customers and true profit for your bottom line. TrueZONETM features include: 1. 2.3.4.5.6.7.8.9.10

Hazards that can cause severe personal injury, death or substantial property damage. Hazards that will or can cause minor personal injury or property damage. Special instructions on installation, operation or maintenance that are important but not related to personal injury or property damage. The Boiler manual is for use only by a qualified heating installer/service technician. Refer only to this User’s Information Manual for your reference. Improper installation, adjustment, alteration, servic

• S9360A—Spark Ignition, Intermittent Pilot, Remote Display. • S9361A—Spark Ignition, Intermittent Pilot, “On board” Display. • S9370A—Hot Surface Ignition, Remote Display. • S9371A—Hot Surface Ignition, “On board” Display. • Enabled with EnviraCOM™ communication capability to support remote monitoring and diagnostics. • Limit-rated Temperature Sensing Probe. • One or Two Sensor Models. SPECIFICATIONS IMPORTANT: The specifications given in this publication do not include normal manufacturing tol

HIGH OR CALL FOR HEAT LOST SWITCH OPEN SWITCH CLOSE SWITCH OPEN FLAME DEB ON FLAME DEB OFF TIME OUT TIME OUT OR MANUAL RESET LIMIT SWITCH OPEN TIME OUT FLAME SENSED FLAME PROVED TIME OUT WATER TEMPERATURE HIGH OR THERMOSTAT CALL FOR HEAT LOST RETRY DELAYTIME OUT ATIME OUT RECYCLE DELAY DAMPER/ PRESSURE SWITCH OPEN CHECK FLAME POST-TRIAL FLAME DEB ON FLAME DEB OFF FLAME LOST ATIME OUT A TIME OUT TIME OUT B B CIRCULATOR ON CIRCULATOR OFF THERMOSTAT CALL FOR HEAT LOST IDLE ALL OUTPUTS OFF THERMOSTA

— Check for good metal-to-metal contact between the pilot burner bracket and the main burner. — Check the ground lead from the GND(BURNER) terminal on the module to the pilot burner. Make sure connections are clean and tight. If the wire is damaged or deteriorated, replace it with No. 14-18 gauge, moisture-resistant, thermoplastic insulated wire with 105° C [221° F] minimum rating. —Check the ceramic flame rod insulator for cracks or evidence of exposure to extreme heat, which can permit leakage

A separate automatic gas shutoff device is not required in a system that uses this control to meet requirements for CSA International ANSI Z21.87 and UL 353. The overall range of the setpoint is model-dependent but is within 130°F to 240°F (54°C to 116°C). Select devices may have different ranges. Adjusting Settings or Models with “On- Board” Display To discourage unauthorized changing of settings, a procedure to enter the adjustment mode is required. To enter the adjustment mode, press the UP,

Click on any "Contents" item to go to the corresponding page in the Manual.) Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. WHAT TO DO IF YOU SMELL GAS • Do not try to light any appliance. • Do not touch any electrical switch; do not use any phone in your building. • Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions. • If you cannot reach your gas supplier, call the fire departmen

Order number. 3. Order additional system components and system 2. Accessories, if desired. accessories separately. If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Home and Building Control Sales Office (please check the white pages of your phone directory). 2. Home and Building Control Customer Logistics Honeywell Inc., 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 In Canada—Honeyw