MASCOT MSTWW, Инструкция по установке и эксплуатации

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LAARS Heating Systems
Page 32
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 X. 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