FAQs

Are copper fin coils available?

Yes.  Please contact Magic Aire Customer Service for a special quote.

Are freezestats (low limit switches) provided with the Magic Aire Unit Ventilators?

All Magic Aire unit ventilators with Hydronic Coils include an automatic reset,  single-pole, double-throw low limit switch that changes state at 38°F and 42°F.  This is mounted on the leaving side of the coil (heating coil for 4-pipe).  The hydronic low limit is marked as LLT on the unit’s wiring diagram.

All Magic Aire unit ventilators with DX coils include an automatic reset,  single-pole, double-throw low limit switch that changes state at 28°F and 35°F.  This is mounted on the leaving side of the coil.  The DX low limit is marked as LLR on the unit’s wiring diagram.

Both low limits are snap-acting SPDT devices, with terminal 2 as the common.  Terminal 3 closes on temperature rise and Terminal 1 closes on temperature fall.

Low Limit wiring

Are Magic Aire Unit Ventilator TXV’s heat pump compatible? Can I use a Magic Aire Unit Ventilator for DX heat pump service?

Magic Aire Unit Ventilators DX coils are ready for heat pump service using bi-flow thermal expansion valves.  Electric heat can be ordered in combination with the DX coils but this combination is not available with a face and bypass damper.  Controls would need to be provided by others for a heat pump control sequence with supplemental electric heat.

Are the TXV valves used with the Unit Ventilator DX coils adjustable?

No. Unit Ventilator DX Coil TXV’s are biflow. Literature is available for each type (R-22 and R-410A).

Do Magic Aire Unit Ventilator DX coils come with a thermal expansion valve (TXV)?

Yes.  All unit ventilator DX coils come with a TXV.

In NM4, I can not select a DX coil when I have Electric Heat selected. Why?

The first reason could be that face and bypass control was selected.  Face and Bypass is not available with DX/Electric Heat configurations.

Another reason could be the number of heating elements selected.  The maximum number of heating elements available is 4 elements when in combination with a DX coil.

See coil combination chart below.

Coil Combos

What are the coil combinations available for a UV? What are the coil combinations available for a UH?

Coil Combos (1)

What are the fins per inch (fpi) for Magic Aire unit ventilator coils?

For Units 500-1500 CFM, the 5 row high capacity coils are 14 fpi and all other standard capacity coils are 10 fpi (hydronic and DX).  For 2000 CFM units, all of the coils (hydronic and DX) are 14 fpi. Therefore, there is not a different coil for “standard capacity 5 row coil” and a “high capacity 5 row coil”.