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Modulex Light Commericial Series
CHAPTER 4: Installation Instructions
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
•
Close the gas shutoff valve upstream from the boiler
•
Shut off the power at the main power switch
•
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 reason, the unit's supply voltage, gas pressure and water pressure must be
maintained and available during these activities.
WARNING!
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.
4.33 FILLING THE SYSTEM
Necessary Precautions While Filling the System
Do not mix the C/H system's water with anti-freeze or anti-corrosion solutions using incorrect
concentrations! Doing so can cause damage to the gaskets and might cause noise during
normal boiler operation.
WARNING!
AERCO refuses all liability for injury to persons, animals or damage to property deriving from
not having respected the above mentioned recommendations.
Before filling the heating system, the complete system, including all zones, must be thoroughly
cleaned and flushed to remove sediment.
Flush until clean water runs free of sediment. AERCO suggests using an approved system
cleaner to flush the system, but not the boiler. Always use AERCO approved antifreezes. See
the list in Section 2.8.3, Water Quality Requirements.
Never use reverse osmosis, deionized, distilled water or mineral treated water for filling the
heating system.
OMM-0087_J • GF-143 • 11/17/2020
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 69 of 150
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