4211-195 05-22-12
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AI
SERIES STEAM BOILER WITH T100 CONTROL
INSTALLATION INSTRUCTIONS
OPERATING INSTRUCTIONS (continued)
BOILER START The boiler operation may be started in one of two ways.
1. To start the boiler manually, place the BOILER OPERATION switch (located on the boiler’s switch panel) to its MANUAL RUN position. The switch
will show a red color at its left side to indicate that it has been turned on and the BOILER ON light will turn on to show the boiler is running. If an
optional Run Clock is installed, this manual switch will start the boiler regardless of the clock setting and the boiler will continue to run until the switch
is returned to the CLOCK RUN position.
2. To start the boiler using the optional Run Clock, leave the BOILER OPERATION switch in its CLOCK RUN position. Program the Run Clock to
the desired on (RUN) and off periods. To determine if the clock is switching properly, rotate the dial to the right: when an on period is reached the
BOILER ON light will turn on and the boiler will
fi
ll and heat as necessary. Continue rotating the clock dial until the clock is reset to the current time.
Check the Run Clock dial later in the day to ensure it is maintaining time correctly.
For digital clocks, refer to the Clock Operating instructions.
Normal boiler operation controls water
fi
ll and heating using three water levels. The lowest level serves as an automatically resetting low water cut-off
safety level: if the water level drops too far the heating elements are turned off to prevent damage. When the water level is near the bottom of the water
gage glass, there is enough water in the tank to allow heating it safely. When the water level reaches near mid-glass, the water level has reached its
maximum depth and the water valve will close until the level drops to about 1/4 of the glass again.
Water heating is controlled by the operating pressure switch. While there is enough water in the tank to allow heating, the elements will be energized if
the pressure in the tank is below the switch setting (about 3 psi) and the water will be heated until enough steam pressure is generated to build up pres-
sure in the tank to about 5 psi. At this point the elements are turned off until the pressure drops again.
If the steam bath is not turned on, no steam will be released to the room and the boiler will need to boil the water only to make up for temperature loss
from the boiler itself. During a steam bath, particularly during initial heating, the boiler may need to heat continuously to compensate for the steam being
released to the steam room. The boiler might not build up any pressure during this period.
When the boiler is started with an empty tank, the steam outlet valve(s) will open to release air pressure created by adding water. If not released, this
air pressure could be sensed by the pressure switch, preventing heating. When the water reaches the safe heating level, the heat will turn on and, if the
steam bath is not turned on, the steam valve(s) will close when the water reaches its maximum depth.
STEAM ROOM OPERATION The steam room begins heating when the thermostat or room switch is used to “turn on” the steam bath. While the steam
bath is on, steam is released to the room as needed to bring the temperature up to the thermostat setting. When the boiler supplies two rooms, the
rooms operate identically but independently. Only one room will be described here.
The T100 is the thermostat, controlling the steam bath temperature.
Refer to Amerec doc. 4209-53 for the detailed
T100 operating instructions
.
The T100 lets the user start and stop the steam bath, adjusts the bath temperature, and controls how long the bath
runs before automatically stopping. When the bath is turned off, the boiler’s steam valve will remain closed and the
corresponding ROOM STATUS LEDs on the boiler will remain turned off.
LIGHTS AND SWITCHES are provided to show boiler operating status, to indicate fault conditions and to allow manual
control of boiler functions for routine maintenance and troubleshooting. During normal steam bath operation, the
ROOM STATUS LEDs on the boiler will light steadily. These LEDs will blink in speci
fi
c patterns to indicate problems
with the steam bath temperature control or boiler water level control.
When the boiler is operating normally, the BOILER ON light will be lit. All switches will be set to the left except the
BOILER OPERATION switch will be set to MANUAL RUN (unless an optional Run Clock is installed).
The boiler’s STEAM VALVE OPEN lights will turn on when steam is released to heat the corresponding steam room.
Set a room’s ROOM LOCKOUT switch to the CLOSE VALVE position to prevent steam being released to that room
during servicing, room cleaning, etc.
Whenever the boiler is operating, the heat contactors will close as needed to turn on the heating elements, heating the
boiler’s water and creating steam. The BOILER HEATING light turns on when the elements are turned on. Place the
HEAT switch in the OFF position to prevent heating, such as during manual drain/blowdown. NOTE:
when a steam
valve opens to release steam to a room, the boiler heating is disabled for a few seconds. This is designed to increase
the elements’ working life
.
When the feedwater valve opens to re
fi
ll the boiler, the WATER VALVE OPEN light will turn on. Set the FEED-WATER
switch to STOP FILL to prevent water
fi
ll, such as during manual drain/blowdown.
