NorAire NC-FE series, Installation & Operating Instructions Manual

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05/16/2014 11 NI216
11. Control board, left center, locate a tab marked “pump”. Clip jumper R voltage to the “pump” tab. This
will force the internal circulator pump on and you should be experiencing flow throughout the system.
12. Depending upon the air separator and air relief system, loosen the top air cap.
13. Open all manifold valves – A and B.
14. Depending upon the number of zones and the zone control system, the zone controller may need to be
bypassed to activate zone valves or to turn on zone pumps to adequately verify flow within the total
system.
15. If the pressure gauge goes down or fluctuates there is probably still air in the system. Again, depending
upon the quality of the air separator it may purge out itself or you may need to start over.
16. Open all radiant zones and the manifold individual loop valves. Depending upon the manifold features,
you may have small flow indicators which can verify equal or adequate flow in each loop.
17. After you feel comfortable there is good circulation and all the air has been purged, recheck pressure
gauge. A one or two story building/house system with cold water should be set at about 10 to 12 psig.
Using the still connected city water set correct pressure.
18. Disconnect city water hose and drain hose and remove the “pump” jumper.
Purge or Recheck Defrost Boiler Bypass
1. Setup or source/drain should be the same as above and in heating mode.
2. This should actually be run before step 15 above.
3. On the back of the NorAire control board, upper right, at the heat pump connection remove the “D” wire.
Be prepared to clip jumper R to D.
4. This test needs to verify that the water going through the pump begins to heat up from the boiler during
a simulated defrost. If it does not heat up at the pump (but the top of the boiler vessel gets hot), you
must assume the ½” pipe between the vessel top and the tee at the pump input is air logged and has
caused the pump to stop circulating.
5. Jumper heat pump R to D terminal block point, wait approximately 2 minutes and you should begin
feeling warm water entering the pump. As time goes on the ½” pipe should be getting hotter and hotter
because water is simply circulating through the boiler/pump/heat exchanger/ back through the boiler.
WARNING
DO NOT LEAVE THIS TEST UNATTENDED.
6. With confidence that the warm water is indeed circulating through the heat exchanger, remove the R to
D jumper and replace the wire from the ODU into the D screw terminal block point (reference step 3
above).
7. Continue step 15 above.