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4.14 Plumbing Guidelines.
- E nsure pipe material is suitable for the local codes and industry standards.
- The pipe must be cleaned and without any debris.
- D o not apply torch heat within 12˝ of the bottom connections of the unit.
- T he 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
- A pply a backflow preventer valve in the make-up water supply (water Inlet) to the unit as required by local
codes.
Isolation valve
Backflow preventer
Pressure relief valve
Ball valve
Use at least the MINIMUM pipe size for all Water Heater loop piping
D WH 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.
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
Total Hardness
Aluminum
Chloride
Copper
Iron
Table 13. Water Quality Specifications
3/4" PIPE (GAS INLET )
3/4" PIPE (DHW OUTLET)
CAUTION
Maximum Allowable Level
200 mg/l (12 grains/gallon)
0.05 to 0.2 mg/l
250 mg/l
1 mg/l
0.3mg/l
LAARS Heating Systems
3/4" PIPE (DCW INLET )
Contaminant
Manganese
pH
Sulfate
Total Dissolved Solids (TDS)
Zinc
Maximum Allowable Level
0.05 mg/l
6.5 - 8.5
205 mg/l
500 mg/l
205 mg/l
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