NorAire NC-FE series, Инструкция по установке и эксплуатации

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05/16/2014 22 NI216
User Instructions
External Aquastat or Controlling Thermostat
All operate on or off functions are controlled by the external aquastat or thermostat device connected to the W
(heating) or Y (cooling) terminal screw. Thus the user must become familiar with his/her hydronic system
design and hydronic (heat or cool) temperature control.
If the Electro Buffer Tank Controller is used and connected per special hookup instructions, the user operation
changes to the Buffer Tank Controller temperature controlling devices. In this case this NorAire unit is a
“slave” to the Buffer Tank Controller inputs, setups, front panel monitor. However, the NorAire IDU front
panel monitor will still respond with the expected functions.
The heat or cool system can be monitored by the front panel seven LED lights, see previous page.
If the SERVICE light repeatedly comes on after initial installation, the system design needs to be further
evaluated and corrected. For corrective action, note the status indication and associate with the SERVICE light
counts. This will assist in determining the problem.
Note: If there appears to be reduced capacity or inefficient performance, observe the SERVICE (and
ALARM) light for a complete heat or cool thermostat cycle.
If the ALARM light is on (or repeats), one of the conditions shown has been sensed. This can initiate a Hard
Hold which means in mode B or C the backup boiler will be controlled by stat W input. The boiler is on until
the W input is satisfied. The next W input basically cancels the Hard Hold and the internal alarm sequence and
sensor evaluation repeats. This should prevent winter freeze-up, but service and repair must be taken care of as
soon as possible. The front panel switch could be moved to the boiler position thus preventing this continual
cycling and “hunting” without any result.
Setup & Options
The Field Setup or Programming section in this manual may also have user information and attention
requirements. The Additional Hookup or Special Equipment Concerns section may have optional or
accessory installed items which will require user attention.
Configuration
Attached HX103 drawing set provides various plumbing/piping possibilities for typical hydronic system. If
possible it will be beneficial for the user to relate an appropriate piping drawing to his/her installed system. The
upper left descriptive statements and notes are very important. Btu/h sizing of the cooling forced air water coil
and determining whether this forced air water coil is cooling only or needs to be heating and cooling will
become significant for proper operating efficiency and long-term heat pump operating life. The heat pump
system needs long run periods, short cycling is harmful and very inefficient, and the front panel SERVICE or
ALARM light should never come on unless there is a flow or hydronic load deterioration or failure.
This IDU has the output or load circulator pump installed. Typically in most plumbing arrangements for radiant
floor heating or with
cooling only forced air water coil, the internal pump is adequate. However, this internal
pump only has a fixed circulation pressure or flow rate, if there is not adequate water flow to the field connected
load devices, inefficiencies will develop. In some cases an additional series pump in either the heat output pipe
or the chilled water direct output pipe may be required.
See
Preventative Maintenance section for proper component care.