Figure 17: Air Handler Piping Installation
| Mixing Valve |
| 6” (15.2cm) |
| Air Gap Max. |
Metal Drain Pan | Adequate Drain |
•Do not use with piping that has been treated with chromates, boiler seal or other chemicals and do not add any chemicals to the water heater piping.
•If the space heating system requires water temperatures in excess of 120°F (48.9°C), a mixing valve (provided) must be installed per the manufacturer’s instructions
in the potable hot water supply to limit the risk of scald injury.
•Pumps, valves, piping and fittings must be compatible with potable water.
•A properly installed flow control valve is required to pre- vent thermosiphoning. Thermosiphoning is the result of a continuous flow of water through the air handler circuit during the off cycle. Weeping (blow off) of the temperature and pressure relief valve (T & P) or higher than normal water temperatures are the first signs of thermosiphoning.
•The hot water line from the water heater should be ver- tical past any mixing valve or supply line to the heating system to remove air bubbles from the system.
•Do not connect the water heater to any system or components previously used with
Storage Tank Installation
When installing the Polaris® with a storage tank, see figure 18 for piping suggestions.
Solar Installation
If this water heater is used as a solar storage heater or as a backup for the solar system, the water supply tempera- tures to the water heater tank may be in excess of 120°F (48.9°C). A mixing valve must be installed in the water sup- ply line to limit the supply temperature to 120°F (48.9°C).
Note: Solar water heating systems can often supply water with temperatures exceeding 180°F (82.2°C) and may result in water heater malfunction.
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