NorAire NC-FE series, Installation & Operating Instructions Manual

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05/16/2014 12 NI216
Radiant Heat & Cooling/Chilled Water I Circuit Procedure
Comment – the following relates to the chilled water out piping and water coil circuit. It is assumed a
procedure similar to the previous will be used to take care of the heating water out and the radiant floor
circuits.
1. Condition the air stat (Y) or cool aquastat for a 10-second cooling call, remove jumper or condition stat
back to off. The front panel STATUS light should indicate cooling mode with a slight off blip.
a. This conditions the internal NorAire pump to “chilled water OUT”.
2. Suggest a hose and valving arrangement as shown, shutoff valves C and D with two connection hose
bibs. Valve D should be as close as possible to the tee and also the drain hose bib close to valve D.
3. Connect a city water or well water source as shown.
4. All valves A and B or any possible flow associated with radiant manifold circuit must be closed.
5. Close valve D and open valve C.
6. Valve C can be a “throttling valve” to limit pressure.
7. Begin adding source water, drain should show bubbles or discharge water.
a. Flow is through hydronic IN/internal pump/chilled water OUT/water coil/drain.
b. Comment – depending upon buffer tank/water coil arrangement (HX103 sheets 3, 4, 5, 6, 11)
where the buffer tank is heating only and feeds directly into the NorAire IN. Also, the next
section shows a buffer tank arranged for heat/cool switchover (HX103 sheets 7, 8, 9).
8. Reread paragraph 5 (basics) above.
9. Close both source and drain hose bibs and open valves D and C.
10. Probably recheck above steps 10 through 17 under Radiant Heat Procedure. The existing setup for
source and drain can be used to correctly set the system pressure.