Installation & Service Manual
6
To Turn Off Gas to Appliance
1.Set the thermostat to the OFF position.
2.Turn off all electric power to the appliance if service is to be performed.
3a. 90,000 - 135,000 and 399,999 - 500,000 Btu/hr models, rotate the gas control knob on the gas valve clockwise to the “OFF” position. Do not force.
3b. 180,000 - 360,000 Btu/hr models, rotate the gas control knob on the gas valve clockwise to the line on the collar around the knob. Depress the knob and continue rotation to the “OFF” position. Do not force.
Should overheating occur or the gas fail to WARNING shut off, turn off the external manual gas
valve to the appliance.
Safety Shutoff Test for Spark Ignition Pilot System
1.Turn “OFF” gas supply to the appliance.
2.Turn thermostat to highest setting.
3.Turn electric power “ON”.
4.Pump relay pulls in to start pump.
5.The ignition will begin sparking at the pilot.
6.The ignition module will lock out after the 90 second trial for ignition period on the 90,000 through 399,999 Btu/hr models and after the 15 second trial for ignition period on the 500,000 Btu/hr model.
7.Immediately call a qualified serviceman or installer to repair an ignition system that fails to lock out and properly shut down burner operation.
8.After successful completion of the test, readjust the thermostat to normal setting.
9.Turn “ON” gas supply.
10.Turn power “OFF” then “ON” to reset ignition module.
11.If ignition system fails to operate properly, repair work must be performed by a qualified serviceman or installer.
Intermittent Pilot Spark Ignition System (F9/M9)
The ignition module is not repairable. Any modification or repairs will invalidate the warranty and may create hazardous conditions that result in property damage, personal injury, fire, explosion and/or toxic gases. A faulty ignition module must be replaced with a new module.
Ignition and Control Timings
F1 Standing Pilot Models (thermocouple supervised)
Pilot Flame Failure Response Time - 180 Seconds Maximum
F9 Intermittent Spark Ignition Pilot Models
Pilot Trial for Ignition Period - 90 Seconds (90,000 through 399,999 Btu/hr models)
Pilot Trial for Ignition Period - 15 Seconds (500,000 Btu/hr model)
Pilot Failure Response Time - 0.8 Seconds at less than 1.0 µA flame current
Pump Delay Timing (Standard on Water Heaters and Optional on Boilers) - 30 Seconds after burner shutdown
Freeze Protection
1.For water heaters and boilers that utilize the pump delay option, if either the inlet sensor or the optional multi- purpose temperature sensor reads below 40°F, the pump relay will turn ON. When the temperature rises above 50°F the pump relay will turn OFF.
2.Location - Heating boilers and water heaters must be located in a room having a temperature safely above freezing [32°F(0°C)].
3.Caution - A room where the appliance is installed and operating under a negative pressure may experience a downdraft in the flue of an appliance which is not firing. The cold outside air pulled down the flue may freeze a heat exchanger. This condition must be corrected to provide adequate freeze protection.
4.Freeze protection for a heating boiler or hot water supply boiler using an indirect coil can be provided by using hydronic system antifreeze. Follow the manufacturers instructions. DO NOT use undiluted or automotive type antifreeze.
5.A snow screen should be installed to prevent snow and ice accumulation around the appliance venting system in cold climates.
44 
