Laars MSTWW199, Руководство по эксплуатации

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Mascot ST Tankless Water Heater
Page 31
4.14
Plumbing Guidelines.
- Ensure pipe material is suitable for the local codes and industry standards.
- The pipe must be cleaned and without any debris.
- Do not apply torch heat within 12˝ of the bottom connections of the unit.
- The pipe size used for supply heating water should be the same size used for the return heating water.
- The size of the hot water pipe should be 3/4˝ diameter.
- Isolation valves(Shutoff valve) will be used.
- All piping should be insulated.
Applicable Backflow Preventer
- Apply a backflow preventer valve in the make-up water supply (water Inlet) to the unit as required by local
codes.
Use at least the MINIMUM pipe size for all Water Heater loop piping
DWH pipe minimum size: 3/4˝
When using external recirculation mode with the built-in pump, observe the following maximum recirculation pipe
lengths including fittings (3/4” pipe is recommended):
-1/2” Pipe- 100’ (30m) of equivalent length -3/4” Pipe- 500’ (150m) of equivalent length. Lengths in excess of these
limits will require an external recirculation pump.
CAUTION
Water Quality
Potable water is defined as drinkable water supplied from a utility or from a well, in compliance with EPA secondary
maximum contaminant levels (40 CFR Part 143.3) as shown in Table 13. Water quality must be within these maximum
allowable parameters. If your water contains contaminants in quantities greater than outlined by EPA, then water
treatment is required and additional maintenance may also be required. If you suspect that your water is contaminated
in any way, discontinue use of the appliance and contact a qualified technician.
Contaminant
Maximum Allowable Level
Contaminant
Maximum Allowable Level
Total Hardness
200 mg/l (12 grains/gallon)
Manganese
0.05 mg/l
Aluminum 0.05 to 0.2 mg/l
pH
6.5 - 8.5
Chloride
250 mg/l
Sulfate
205 mg/l
Copper
1 mg/l
Total Dissolved Solids (TDS)
500 mg/l
Iron 0.3mg/l Zinc 205 mg/l
Table 13. Water Quality Specifications
3/4" PIPE
(DCW INLET)
3/4" PIPE (DHW OUTLET)
3/4" PIPE (GAS INLET )
Isolation valve
Backflow
preventer
Pressure relief
valve
Ball valve
Anti-scald rated
Mixing Valve
CAUTION
Scalding Risk: Manufacturer
strongly recommends the
use of an anti-scald mixing
valve at domestic hot water
outlet (boiler location) to
reduce potential for scalding.
Contact Manufacturer for
recommended models.
Check with local codes.
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