Desert Aire SelectAire Plus SP Series, Инструкция по установке и эксплуатации

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Desert Aire - SP Manual
with an appropriate concentration of inhibited glycol solution. Residual fluid can be left in
the coil without the threat of freeze damage provided the correct concentration of inhibited
glycol was used. The recovered fluid can then be used to flush other coils. Select an
inhibited glycol solution that will protect the coil from the lowest possible temperatures that
can occur at the particular coil’s locality. The following tables have been provided for
convenience.
Estimate the volume of the coil in gallons:
For 0.625” tubes (1.5” face tube spacing):
fin height (in) x finned length (in) x # of rows x 0.0011 = gallons
For 0.5” tubes (1.25” face tube spacing):
fin height (in) x finned length (in) x # of rows x 0.00083 = gallons
• Isolate the coil from the rest of the system by closing the valves on both the supply and
return lines.
• Drain the coil by opening all drain valves and/or the drain plug. Remove the vent lug to aid
the draining process.
• Close the drain valve(s) and drain plug.
• Connect the flushing system to the coil. A typical system is shown in Figure 40
• With the throttling valve closed, start the pump and operate until the air vented from the
coil. Next, close the air vent.
• Open the throttling valve about half-way and circulate the fluid through the coil for 15
minutes. Check the strength of the fluid. A hydrometer or test kit from the fluid
manufacturer is suitable for this application.
• Adjust the solution strength as needed and circulate the fluid for another 15 minutes.
• Repeat steps above until the desired concentration is reached.
• Shut the pump down and drain the inhibited glycol from the coil.
• The recaptured fluid can be used to flush other coils.
NOTE: Be sure to follow the manufacturer’s recommendations before utilizing any glycol based anti
freeze solution. Additional fluid will be required for the pump, connected piping and fluid reservoir.
Formulas are for estimation purposes only.