NorAire NC-FE series, Инструкция по установке и эксплуатации

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05/16/2014 13 NI216
Cooling/Chilled Water II Circuit Procedure
Comment – the previous page circuit had the chilled water return feeding directly to the hydronic IN pipe.
In this circuit the chilled water return feeds at the buffer tank top for buffer tank switchover application.
1. Condition the air stat 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. In this plumbing arrangement the water coil uses the buffer tank as it returns to the NorAire hydronic IN.
The buffer tank is used for both heat and cool thus switchover is required and needs to be controlled by
the added Buffer Tank Controller (HP-BTC).
3. Connect a city water or well water source as shown. This source connection can be anyplace forcing
either into the bottom of the buffer tank or directly into IDU IN (there may be a drain valve at the
bottom of the buffer tank).
4. All valves A and B (Radiant Heat Procedure) must be close but in this case open valve B which is
associated with the manifold having the source connection.
5. Close valve F and open valve E. Suggest valve F and drain hose bib as close as possible to the tee.
6. Begin adding source water.
a. Flow is through the source attached manifold/buffer tank/hydronic IN/internal pump/chilled
water OUT/water coil/drain.
7. Reread paragraph 5 (basics) above.
8. Close both source and drain hose bibs and open valves F and E.
9. 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.