20
LP- 446 REV. 9.3.14
Water with a high TDS concentration will greatly accelerate lime and scale formation in the hot water system. Most high TDS
concentrations precipitate out of the water when heated. This can generate a scale accumulation on the heat transfer surface that will
greatly reduce the service life of a water heater. This scale accumulation can also impede the ability of the heat exchanger to transfer
heat into the water. A heat exchanger damaged or blocked by lime/scale accumulation must be replaced.
The manufacturer of the water heater has no control of water quality, especially TDS levels in your system. Total dissolved solids in
excess of 2,000 ppm will accelerate lime and scale formation in the heat exchanger. Heat exchanger failure due to total dissolved solids
in excess of 2,000 ppm is a non-warrantable condition.
Failure of a water heater due to lime scale build up on the heating surface
IS NOT covered by the warranty.
Hardness:
7 grains
Chloride levels:
100 ppm
pH levels:
6-8
TDS:
2000 ppm
Sodium:
20 mGL
*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 12 of this manual).
Piping components
Water heating system piping:
Water boiler system piping MUST be sized per technical pipe requirements listed in Table 7. Reducing pipe size can restrict flow rate
through the 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.
Anti-scald mixing valve:
Field supplied. A thermostatic mixing valve is recommended when storing domestic hot water above 115°F.
Unions:
Field supplied: Recommended for unit serviceability.
DO NOT USE DIELECTRIC UNIONS!
ONLY BRASS, COPPER, OR STAINLESS STEEL.
Pressure relief valve:
Factory supplied on VWH. The pressure relief valve is sized to ASME specifications. Storage tank may require additional relief valves
depending on local codes.
Summary of Contents for 500 HL
Page 12: ...12 LP 446 REV 9 3 14 Figure 2 Dimensions and Specifications ...
Page 21: ...21 LP 446 REV 9 3 14 H PIPING DIAGRAMS Figure 6 ...
Page 44: ...44 LP 446 REV 9 3 14 E GAS VALVE Figure 26 Mod Con 500 Gas Valve ...
Page 52: ...52 LP 446 REV 9 3 14 Figure 33 Mod Con Internal Connection Diagram LP 428 K ...
Page 71: ...71 LP 446 REV 9 3 14 Figure 36 ...
Page 72: ...72 LP 446 REV 9 3 14 Figure 37 ...
Page 73: ...73 LP 446 REV 9 3 14 Figure 38 ...
Page 74: ...74 LP 446 REV 9 3 14 Figure 39 ...
Page 77: ...77 LP 446 REV 9 3 14 ...
Page 78: ...78 LP 446 REV 9 3 14 ...
