Installation & Operation Manual
6 System piping
Scalding
This water heater can deliver scalding temperature water at any faucet in the system. Be careful whenever using hot water to avoid scalding injury. Certain appliances such as dishwashers and automatic clothes washers may require increased temperature water. By setting the thermostat on this water heater to obtain the increased temperature water required by these appliances, you may create the potential for scald injury. To protect against injury, you should install a mixing valve in the water system. This valve will reduce point of discharge temperature by mixing cold and hot water in branch supply lines. Such valves are available from the local plumbing supplier.
Figure
Water with a hardness of less than 5 grains per gallon will usually have a pH which can be aggressive and corrosive causing
Piping components
Water heater system piping:
Water heater system piping MUST be sized per the pipe requirements listed in Table 6C. Reducing the pipe size can restrict the flow rate through the water heater, causing inadvertent high limit shutdowns and poor system performance.
Check valves:
Field supplied. Check valves are recommended for installation as shown in FIG.’s
Water heater 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 heater.
Anti-scald mixing valve:
The following chart (Table 6B) details the relationship of water | Field | supplied. An | mixing valve | is recommended | |||||||||||||||
temperature and time with regard to scald injury and may be | |||||||||||||||||||
when storing domestic hot water above 115°F. |
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used as a guide in determining the safest water temperature for |
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Unions: |
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your applications. |
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| Field supplied. Recommended for unit serviceability. |
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Table 6B Approximate Time / Temperature Scald Chart |
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Temperature and pressure relief valve: |
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APPROXIMATE TIME / TEMPERATURE |
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RELATIONSHIPS IN SCALDS |
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| Factory supplied on water heaters. The temperature and pressure | ||||||||||||||
120°F |
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| More than 5 minutes |
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| relief valve is sized to ASME specifications. Storage tanks may | |||||||||||
125°F |
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| 1 1/2 to 2 minutes |
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| require additional valves depending on local codes. |
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130°F |
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| About 30 seconds |
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| Tank sensor: |
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135°F |
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| About 10 seconds |
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| Lochinvar supplies a tank sensor. The tank | sensor must be | ||||||||||
140°F |
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| Less than 5 seconds |
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| installed in the tapping provided in the lower 25% of the storage | |||||||||||||
145°F |
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| Less than 3 seconds |
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| tank to achieve proper operation. As shipped from the factory, | |||||||||||||
150°F |
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| About 1 1/2 seconds |
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| the tank sensor is in the literature package shipped with the unit. | |||||||||||||
155°F |
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| About 1 second |
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| Placing the sensor in the tapping provided on the storage tank | |||||||||||||
Water chemistry |
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| will improve temperature response and prevent short cycles of | |||||||||||||
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| Water temperature rise and maximum |
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| operation. |
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NOTICE |
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| flow data is based on heating potable |
| Table | 6C Water Heater Pump Applications / Recommended | |||||||||||||||
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| water with a hardness of 5 to 25 grains |
| Temperature Rise |
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| per gallon and total dissolved solids |
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| Water Heater Pump Applications |
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| not exceeding 350 ppm. |
| Model | *Pipe | Armstrong |
| Grundfos | Flow Rate | Loss |
| Temp. | |||||||
The required temperature rise and the standard |
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| Size |
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| (GPM) | (FT/HD) |
| Rise | ||||||||
circulating pump are sized based on the heating of |
| 151 |
| E8 |
| 16 |
| 16.6 |
| 18°F | |||||||||
| 200 |
| E8 |
| 21 |
| 11.8 |
| 18°F | ||||||||||
potable water with a hardness of 5 to 25 grains per gallon |
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| 286 | 2" |
| E17 |
| 30 |
| 17.1 |
| 18°F | |||||||||
and a total dissolved solids | not exceeding 350 ppm. |
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| 400 | 2" |
| E24 |
| 39 |
| 21 |
| 18°F | |||||||||
Consult the manufacturer when heating potable water |
| 501 | 2" |
| E22 |
| 53 |
| 26 |
| 18°F | ||||||||
exceeding these specifications. |
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| 601 | 2" |
| E22 |
| 53 |
| 26 |
| 22°F | ||||||
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| 701 | 2" |
| TP | 63 |
| 32 |
| 22°F | ||||||||
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Heating of high hardness and/or high total dissolved |
| 801 | 2" |
| TP | 67 |
| 31 |
| 24°F | |||||||||
solids water may require a larger circulating pump, and a |
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| Pump sizing and flow requirements are based on 45 feet of | |||||||||||||
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| NOTICE |
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revised temperature rise specification based on the water |
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| piping, 4 - 90° elbows, and 2 - fully ported ball valves. | |||||||||||||||
chemistry of the water to be heated.
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