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A1009091 - 661A0600_EN • A
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CHAPTER
1
CHAPTER 1 - PRE-INSTALLATION
• Artificially softened boiler/heating wa-
ter from a salt based water softener is not
allowed on the heating side of the water
heater
• Distilled or RO water is not allowed on the
heating side of the water heater
NOTICE
Table 1 - Boiler/Heating Water Quality
Boiler water hardness
Less than 7 grains/gallon
pH level
Between 6.0 and 8.0
Chlorine
Less than 120 ppm (mg/l)
Chlorides
Less than 150 ppm (mg/lL)
Conductivity
100 to 300 µS/cm
TDS (Total Dissolved Solids)
50 to 300 ppm (mg/L)
Molybdate Corrosion Inhibitor
100 to 300 ppm
Glycol
50% maximum inhibited pro-
pylene glycol only non-toxic
1.3. Operating Restrictions
• Maximum domestic hot water temperature is 180ºF
(82°C) for commercial applications and 160ºF (71°C)
for residential applications.
• Maximum boiler water temperature is 210ºF (99° C).
• Maximum working pressure for tank (domestic wa-
ter) is 150 psig.
• Maximum working pressure for the coil (boiler wa-
ter) is 30 psig.
• Water quality limitations (based on E.P.A National
Secondary Drinking Water Regulations). See
Table
2 on page 3.
In hard water areas (more than 7 grains of
hardness) use a water softener on the cold do-
mestic supply water to the appliance to prevent
scaling.
BEST PRACTICE
BEST PRACTICE
• Any water conditioning system for pota-
ble domestic water must be installed and
maintained in accordance with manufac-
turer’s specifications.
• Do not install the water heater on any appli-
cation if the boiler piping contains non-ox-
ygen barrier tubing or if the boiler piping is
considered an “open system”. Exposing the
tank of the water heater to oxygen contam-
ination will lead to premature tank failure
and denial of the warranty.
NOTICE
The MONARCH Tank Indirect Water Heater requires
both the closed loop boiler heating water and the open
loop domestic water to meet certain criteria to ensure
the safe and reliable operation of the unit and to main-
tain the warranty. The guidelines laid out below must
be followed for all installations of the MONARCH Tank
Indirect Water Heater.
NOTICE
Failure to follow the instructions contained in
this section will void the Warranty.
