55
10
Start-up
Installation & Operation Manual
Check/control fi ll water chemistry
Conduct water quality testing prior to
installing the appliance. Various solutions
are available to adjust water quality.
Hardness between 5 and 15 grains per gallon
1. Consult local water treatment companies for hard water
areas (above 15 grains per gallon hardness).
2. Hardness levels that are above 15 grains/gallon can lead
to lime scale buildup throughout the boiler system. If the
fi ll water is below 5 grains/gallons, usually due to use of a
water soft ener, it is recommended to mix in some potable
water at the inlet to increase the hardness of the water to
above 5 grains/gallons.
pH between 6.5 and 9.5
1. pH levels below 6.5 can cause an increase in the rate of
corrosion. pH of 9.5 or higher can potentially cause lime
scale buildup.
Total Dissolved Solids (TDS) below 2,000 ppm
1. Total dissolved solids are all minerals, salts, metals, and
charged particles that are dissolved in water.
2. Th
e greater the amounts of TDS present, the higher the
corrosion potential due to increased conductivity in the
water.
3. If
using
soft ened water to fi ll the boiler, it is still possible
to have high TDS. Th
is water can be corrosive. It is
recommended to mix in some potable water with the
soft ened water to reduce this aff ect.
Chlorine concentration less than 200 ppm
1. Do not fi ll boiler or operate with water containing
chlorine in excess of 200 ppm.
2. Filling with fresh drinking water should be acceptable.
3. Do not use the boiler to directly heat swimming pool or
spa water.
Freeze protection
IMPORTANT
Fill water
Th
e manufacturer recommends the following for properly
fi lling your boiler with the appropriate water chemistry for
closed loop boilers. Good fi ll water quality will help extend
the life of the appliance by reducing the eff ects of lime scale
buildup and corrosion in closed loop systems.
1. Use glycol only if needed for freeze protection.
2. Propylene glycol is the recommended freeze protection.
3. Make
sure
to
fl ush the boiler system before adding glycol.
4. Determine the freeze protection fl uid quantity using
system water content, following the fl uid manufacturer's
instructions. Boiler water content is listed on page 6.
Remember to include expansion tank water content.
5. Local codes may require a backfl ow preventer or actual
disconnect from city water supply.
6. When using freeze protection fl uid with automatic fi ll, it is
suggested to install a water meter to monitor water makeup.
Freeze protection fl uid may leak before the water begins to
leak, causing the concentration to drop, which reduces the
freeze protection level.
7. Th
e freeze protection set points may be lowered when freeze
protection fl uid is used (see the Knight XL Service Manual).
8. Consult the glycol manufacturer for details on the suggested
mix of glycol and water for the desired freeze protection
level and the de-rate eff ect it will have on the boiler output.
Test / replace freeze protection fl uid
1. For systems using freeze protection fl uids, follow the fl uid
manufacturer's instructions.
2. Freeze protection fl uid must be replaced periodically due to
degradation of inhibitors over time.
3. It is recommended to test the glycol concentration annually
and adjust within the desired set points.
Ethylene glycol is toxic, DO NOT use as
your freeze protection. Ethylene glycol has a
sweet aroma which children and pets could
mistake as food and ingest; leading to death.
WARNING