Use and Care Manual
57
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.
Clean system to remove sediment*
1. You must thoroughly ush the system (without the appliance connected) to remove sediment. The high-efciency heat exchanger can be damaged
by buildup or corrosion due to sediment.
2. For zoned systems, ush 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.
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Glycol in hydronic applications should include inhibitors that prevent the glycol from attacking metallic system components. Make certain that the
system uid is checked for the correct glycol concentration and inhibitor level.
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The glycol solution should be tested at least once a year or as recommended by the glycol manufacturer.
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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°F to 180°F, while water expands 3% over the same temperature rise. Allowances must be made in system design for expansion.
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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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A 50% mixture of glycol will result in a BTU output loss of 30% with a 50% increase in head against the system circulator.
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NOTE: BTU losses apply to both CH and DHW.
▪ B. GLYCOL ANTIFREEZE SOLUTIONS
▪ C. CHECK FOR GAS LEAKS
WARNING
WARNING
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%.
Before starting the appliance, and during initial operation, smell near the oor and around the appliance for gas odorant or any unusual
odor. Remove appliance front door and smell interior of appliance enclosure. Do not proceed with startup if there is any indication of a
gas leak. Repair any leaks at once.
PROPANE APPLIANCES ONLY – Both natural gas and propane (LP) have an odorant added to aid in detecking a gas leak. Some
people may not physically be able to smell or recognize this odorant. If you are unsure or unfamiliar with the smell of natural gas or
LP, ask the gas supplier. Other conditions, such as "odorant fade," which causes the odorant to diminish in intensity, can also hide or
camouage a gas leak.
It is highly recommended to carefully follow the glycol manufacturer’s recommended concentrations, expansion requirements, and
maintenance recommendations (pH additive breakdown, inhibitor reduction, etc.) You must carefully calculate the additional friction
loss in the system as well as the reduction in heat transfer coefcients.
CAUTION