HEAT CONTROLLER, INC.
R e s i d e n t i a l S p l i t - 6 0 H z R 4 1 0 A
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Open Loop - Ground Water Systems
(“Indoor” Compressor Section Only)
The “outdoor” version of the compressor section may not be used with open loop systems due to potential freezing of water piping. Typical open loop piping is shown in Figure
9.Shut off valves should be included for ease of servicing. Boiler drains or other valves should be “tee’d” into the lines to allow acid flushing of the heat exchanger. Shut off valves should be positioned to allow flow through the coax via the boiler drains without allowing flow into the piping system. P/T plugs should be used so that pressure drop and temperature can be measured. Piping materials should be limited to copper or PVC SCH80. Note: Due to the pressure and temperature extremes, PVC SCH40 is not recommended.
Water quantity should be plentiful and of good quality. Consult Table 4 for water quality guidelines. The unit can be ordered with either a copper or
Water Quality Standards
Table 4 should be consulted for water quality requirements. Scaling potential should be assessed using the pH/Calcium hardness method. If the pH <7.5 and the Calcium hardness is less than 100 ppm, scaling potential is low. If this method yields numbers out of range of those listed, the Ryznar Stability and Langelier Saturation indecies should be calculated. Use the appropriate scaling surface temperature for the application, 150°F [66°C] for direct use (well water/ open loop) and DHW (desuperheater); 90°F [32°F] for indirect use. A monitoring plan should be implemented in these probable scaling situations. Other water quality issues such as iron fouling, corrosion prevention and erosion and clogging should be referenced in Table 4.
Expansion Tank and Pump
Use a closed,
The pump should be sized to handle the home’s domestic water load (typically
Motorized Modulating Water Control Valve
Note the placement of the water control valve in figure 9. Always maintain water pressure in the heat exchanger by placing the water control valve(s) on the discharge line to prevent mineral precipitation during the
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