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CONDUCTIVITY
HARDNESS
Table 8 – Water Quality Requirements
Clean system to remove sediment*
1. You must thoroughly flush the system (without boiler 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 the Maintenance Section (Part 14 of this manual).
Test/replace freeze protection fluid
1. For systems using freeze protection fluids, follow fluid manufacturer's instructions to verify inhibitor level and that other fluid
characteristics are satisfactory.
2. Freeze protection fluid must be replaced periodically due to degradation of inhibitors over time. Follow all fluid manufacturer
instructions.
Piping components
Heating system piping: Water boiler system piping MUST be sized per technical pipe requirements listed in Tables 4 through 7.
Reducing pipe size can restrict flow rate through the water boiler, causing inadvertent short cycling and poor system performance.
Check valves: Field supplied. Check valves are recommended for installation as shown in Piping Details.
Water boiler isolation valves: Field supplied. Full port ball valves are required. Failure to use full port ball valves could result in a
restricted flow rate through the water boiler.
Mixing valve: Field supplied. A mixing valve is recommended when storing domestic hot water above 115°F.
Unions: Field supplied: Recommended for boiler serviceability. DO NOT USE DIELECTRIC UNIONS! ONLY BRASS, COPPER, OR
STAINLESS STEEL.
Pressure relief valve: Factory supplied on Boiler. The pressure relief valve is sized to ASME specifications. Storage tank may require
additional relief valves depending on local codes.
055, 080, 110
155, 199, 285
399
Table 9
K. FILL AND PURGE HEATING SYSTEM
1. Attach the hose to balance and purge hose connector or drain valve and run hose to nearest drain.
2. Close the other side of the balance and purge valve or shut off valve after the drain.
3. Open the first zone balance and purge or drain valve to let water flow out of the hose. If zone valves are used, open the valves one at
a time manually. NOTE: You should check zone valve manufacturer's instructions prior to opening valves manually, so as not to
damage the zone valve.
4. Manually operate fill valve regulator. When water runs out of the hose, you will see a steady stream without bubbles. Close the
balance and purge valve or drain to stop the water from flowing. Disconnect the hose and connect it to next zone to be purged.
5. Repeat this procedure for additional zones (one at a time).
ACIDITY
CHLORIDE
IRON
COPPER
SODIUM
MINIMUM PIPE SIZES
6 to 8 pH
Less than 400 uS/cm at 25
Less than 100 ppm
Less than 0.5 mg/L
Less than 0.1 mg/L
Less than 20 mg/L
Less than 7 Grains
1" NPT or Copper
1 ¼" NPT or Copper
1 ½" NPT or Copper
WHL-016 REV. 12.18.14
32
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