GENERAL INSTRUCTIONS
Before seasonal start up it is advisable to have a competent service agency check the boiler for soot and scale in the flues, clean the burners, and check the gas input rate to maintain high operating efficiency.
On steam boilers make certain the boiler is filled to the water line as indicated in figure
15.The gauge cocks should be normally open. To remove dirt from the gauge glass the petcock may be opened to flush out the glass.
WARNING:
DISCHARGE WILL BE BOILING HOT WATER.
The radiator valves on a
Air vents on steam radiators and the supply main release air from the system. If radiators do not heat satisfactorily, make sure the air vents are clean and operational.
The lever of the safety valve, shown in figure 15 below, on the boiler should be operated periodically to make sure that it is functioning properly.
WARNING:
DISCHARGE WILL BE BOILING HOT WATER AND STEAM.
The safety valve should open before the steam pressure exceeds the 15 lb. reading on the gauge, (figure 15 to right). If this pressure is
exceeded and the safety valve does not open, it must be replaced. If the safety valve leaks steam when the boiler is operating at normal pressures, it should be immediately replaced. Corrosion can build up rapidly at the valve seat and prevent its functioning as a safety device.
During the heating season the drain cock, on the bottom rear of the boiler, should be opened once a month to flush out the boiler so the device will be free to function properly. Use a pail to catch the discharge.
WARNING: DISCHARGE 
FIGURE 15
WILL BE BOILING HOT WATER.
If the water in a steam boiler appears to be dirty or oily, or the water level in the gauge glass fluctuates considerably, the boiler should be cleaned and skimmed (See page 18 for instructions). A competent service person will use approved cleaning compounds and properly clean and flush out the boiler. He/she should also clean or replace air vents and traps, clean flue passages and check for proper operation of all controls and safety devices.
The venting system should be inspected at the start of each heating season. Check the vent pipe from the boiler to the chimney for signs of deterioration by rust or sagging joints. Repair if necessary. Remove the vent pipe at the base of the chimney or flue and, using a mirror, check for obstruction.
The boiler flue gas passageways may be inspected by a light and mirror. Remove the burner access door, (figure 15 above). Place a trouble lamp in the flue collector through the
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