Starting Up: Filling And De-Aerating The Boiler And Installation; Requirements Of The Water System - Rinnai E75CN Installation & Servicing Instructions Manual

9

Starting up: Filling and de-aerating the boiler and installation

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CAUTION
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NOTICE
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NOTICE
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WARNING

9.1 Requirements of the water system

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WARNING
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WARNING
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NOTICE
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CAUTION
Observe the following rules of safety:
- All work on the unit must take place in a dry environment.
- Rinnai units may never be in operation without their housing, except in connection
with maintenance or adjustments (see Chapter 12 and 13).
- Never allow electrical or electronic components to come into contact with water.
NOTICE
Carry out the following tasks in connection with maintenance, etc. to an already-
installed unit:
- Shut down all programs
- Close the gas shut off valve
- Shut off the power at the main power switch
- Close the service valves (system supply and return)
NOTICE
Take note of the following when maintenance or adjustments are needed:
- The unit must be able to function during these activities; for this reason, the unit's
supply voltage, gas pressure and water pressure must be maintained. Ensure that
this is not a source of potential danger during these activities.
Following maintenance or other activities; always check the installation of all
parts through which gas fl ows (with bubble test using leak-search spray).
Before fi lling the heating system, the complete system, including all zones, must be
thoroughly cleaned and fl ushed to remove sediment. Flush until clean water runs
free of sediment. Rinnai suggests using an approved system cleaner to fl ush the
system, but not the boiler. Always use Rinnai approved antifreezes. See the list at
the end of this chapter. Never use reverse osmosis, D.I., or distilled water for fi lling
the heating system.
Do not use petroleum-based cleaning or sealing compounds in the boiler
system. Damage of seals and gaskets in boiler and system could occur,
resulting in substantial property damage.
The central heating installation needs to be fi lled with potable water.
Use only potable water or approved glycol for fi lling the heating system.
When the water hardness of the fi lling water exceeds > 10.5 gpg (200 mg/L)
and the volume of the installation > 20L/kW (5.2 gallons/3,412 BTU) the water
has to be treated until below the maximum value of 10.5 gpg (200 mg/L).
The pH value of the installation water must be between 6.5 and 8.5.
Check the pH value using proper equipment or by having the water analyzed by a
water treatment company.
If pH differs from above, contact Rinnai engineering for further assistance.
Failure to adhere to the water quality requirements will void the warranty.