61
LP-520 REV. 5.1.17
PART 11 – START-UP PREPARATION
Thoroughly clean and flush any system that has used glycol before installing the appliance.
A. CHECK / CONTROL WATER CHEMISTRY
Chemical imbalance of the water supply may affect efficiency and cause severe damage to the appliance and associated equipment.
Water quality must be professionally analyzed to determine whether it is necessary to treat the water. Various solutions are available to
adjust water quality. Adverse water quality will affect the reliability of the system. In addition, operating temperatures above 135
o
F will
accelerate the build-up of lime scale and possibly shorten appliance service life. Failure of an appliance due to lime scale build-up, low
pH, or other chemical imbalance IS NOT covered by the warranty.
The water must be potable, free of corrosive chemicals, sand, dirt, and other contaminates. It is up to the installer to ensure the water
does not contain corrosive chemicals or elements that can damage the heat exchanger. Potable water is defined as drinkable water
supplied from utility or well water in compliance with EPA secondary maximum contaminant levels (40 CFR Part 143.3) as shown in the
table below. If the water contains contaminants higher than outlined by the EPA, water treatment is recommended and additional, more
frequent maintenance may be required.
If you suspect that your water is contaminated in any way, discontinue use of the appliance and contact an authorized technician or
licensed professional.
Total Hardness
(Residential Use - Below 140
o
F water
temperature)
200 mg/l
(12 grains/gallon)
Total Hardness
(Commercial Use - 140
o
F and above
water temperature)
120 mg/l
(7 grains/gallon)
Total Dissolved Solids (TDS)
Dissolved Carbon Dioxide
(CO2)
Table 26 – Water Chemistry Specifications
Clean system to remove sediment*
1. You must thoroughly flush the system (without the appliance connected) to remove sediment. The high-efficiency heat exchanger
can be damaged by buildup or corrosion due to sediment.
2. For zoned systems, flush each zone separately through a purge valve. (If purge valves and isolation valves are not already installed,
install them to properly clean the system.)
3. Flush system until water runs clean and you are sure piping is free of sediment.
*NOTE: It is recommended you clean heat exchanger at least once a year to prevent lime scale buildup. Follow the maintenance
procedure to clean the heat exchanger in this manual.
NOTE: APPLIANCE FAILURE DUE TO IMPROPER WATER CHEMISTRY IS NOT COVERED BY WARRANTY.
B. GLYCOL ANTIFREEZE SOLUTIONS
Use only inhibited propylene glycol solutions which are specially formulated for hydronic systems. Ethylene glycol is toxic and can
attack gaskets and seals used in hydronic systems. Glycol mixtures should not exceed 50%.
• Glycol in hydronic applications should include inhibitors that prevent the glycol from attacking metallic system components.
Make certain that the system fluid is checked for the correct glycol concentration and inhibitor level.
• The glycol solution should be tested at least once a year or as recommended by the glycol manufacturer.
• Anti-freeze solutions expand more than water. For example: A 50% by volume solution expands 4.8% in volume for a
temperature increase from 32
o
F to 180
o
F, while water expands 3% over the same temperature rise. Allowances must be made
in system design for expansion.
• A 30% mixture of glycol will result in a BTU output loss of 15% with a 5% increase in head against the system circulator.
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