Modulex Light Commercial Series
CHAPTER 4: Installation Instructions
OMM-0158_A
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Figure 4-32: Sensor and BCM Terminal Assignments
4.32 Starting Up: Filling And De-Aerating The Boiler
Carry out the following tasks in connection with maintenance, etc. to an already installed unit:
•
Shut down all programs
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Close the gas shutoff valve upstream from the boiler
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Shut off the power at the main power switch
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Close the C/H service valves (supply and return)
Necessary Precautions for Safety
Observe the following rules of safety:
•
All work on the unit must take place in a dry environment.
•
AERCO units should never be in operation without their cover panels, except in connection
with maintenance or adjustments.
•
Never allow electrical or electronic components to come into contact with water.
Supply Voltage, Gas Pressure, and Water pressure
The unit must be able to function during maintenance procedures or when adjustments are
performed. For this reaso
n, the unit’s supply voltage, gas pressure and water pressure must be
maintained and available during these activities.
W A R N I N G !
Following maintenance or other activities, always check the integrity of all parts through which
gas flows with a bubble test using soap spray to ensure there are no gas leaks.
