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A1009091 - 661A0600_EN • A
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CHAPTER
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CHAPTER 1 - PRE-INSTALLATION
1.4. Potable DHW Water Quality Require-
ments
The domestic water supplied to the water heater must
be potable water that is free from contaminants, sedi-
ment, corrosive chemicals, and debris. It is the respon-
sibility of the installer to ensure the water meets all the
guidelines laid out in this manual. Water quality that ex-
ceeds the guidelines and results in damage or failure of
the indirect tank is not covered by warranty.
If the domestic potable water quality is not within the
allowable levels laid out in the document the water
must be treated. Special attention should be taken in
regard to sediment, hard water, pH, and chlorides.
• If sediment in the water supply is 5 microns or
greater, a water sediment filter must be used.
• If there is hard water, a water softening system
should be used.
• If the chlorides or pH are out of range, a water
treatment company should be consulted to
correct all water quality issues. Any water treat-
ment/conditioning system must be installed
and maintained in accordance with the manu-
facturer’s specifications.
Table 2- Drinking Water Quality
Chloride
less than 150 ppm or mg/l
pH value
min. 6, max. 8
Total hardness
3 - 7 grains/gallon or
50-120 ppm or mg/l.
Total Dissolved Solids (TDS)
less than 120 ppm or mg/l.
Iron
less than 0.3 ppm or mg/l.
Aluminum
less than 0.2 ppm or mg/l.
Copper
less than 1 ppm or mg/l.
Manganese
less than 0.05 ppm or mg/l.
Zinc
less than 5 ppm or mg/l.
Dissolved Carbon Dioxide (CO2)
less than 15 ppm (mg/l.)
Sulfate
less than 250 ppm (mg/l.)
Corrosivity
Non-corrosive
Fluoride
less than 2 ppm (mg/l.)
Foaming agents
less than 0.5 ppm (mg/l.)
1.5. Closed Loop Boiler Heating Water Quali-
ty Requirements
To maintain efficient operation of the heat ex-
changer in the MONARCH Tank the following
instructions must be followed. Failure to follow
these instructions will result in poor operation
of the appliance, lead to potential failure of the
product, and will void the warranty.
CAUTION
During installation and during the annual maintenance,
the water quality must be checked and if found outside
of the requirements, must be corrected.
A micro bubble air elimination device is required to
be installed in all heating systems. An air scoop or an
automatic air vent are not an acceptable substitute for
a micro bubble air elimination device and may not be
used as a substitute in the installation. A few examples
of acceptable devices are:
• Taco 4900 Series
• Caleffi Discal
• Spirovent
If an automatic feed valve is installed in the heating sys-
tem, it may not be left open indefinitely. A continuous
feed of fresh water could damage the system. It is re-
quired that after a short period of time, between one
to four weeks following the installation of MONARCH
Tank Indirect water heater into a heating system, the
automatic feed valve be closed and the water quality
be checked.
Plastic tubing such as PEX might be used in a heating
system for piping or underfloor radiant heat. If oxygen
permeable tubing is used in the heating system with
the MONARCH Tank, it must be separated from the rest
of the heating system with a heat exchanger. Only ox-
ygen barrier tubing can be used in the heating system
side of a MONARCH Tank indirect water heater.
1.6. Glycol
Boiler water (including additives) must be practically
non-toxic, having toxicity rating or class of 1, as listed
in Clinical Toxicology of Commercial Products, 5th Edi-
tion. A maximum 50/50 mixture of inhibited propylene
glycol is allowed. Less than a 20% concentration of gly-
col is not permitted. Glycol will acidify because of ther-
mal degradation overtime and could cause damage to
components in the heating system.
This degradation is why heating system specific propyl-
ene glycol only must be used, these glycols contain ad-
ditives and inhibitors or are meant to work with specific
system inhibitors. The service technician must follow
the antifreeze manufacturer’s instruction. Antifreeze
at a minimum must be checked on an annual basis or
what is specified by the manufacturer of the antifreeze.
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