TTHERM GEO TVA series, Инструкция по установке и эксплуатации

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12/06/2012 17 GI202
Figure 6: Open Loop
– Typical piping diagram.
Note
TTHERM GEO heat pumps are factory set for open loop operation.
Open Loop Operation
– TTHERM GEO heat pumps are factory set for open loop operation. Open or Closed
loop operation is set with jumper J11 on the left side of the GEO Logic controller.
The jumper must be in
place on J11 if the unit is operated on an open loop.
The GEO Logic controller protects the heat exchanger
from freezing by causing the compressor to shut down when the leaving water temperature reaches 39° F. The
compressor will remain off for 2 Anti-Cycle-Delay’s, and the EARTH LOOP FLOW/ SOURCE WATER
LIMIT & HP STAGE 1 LED’s will pulse, while the water runs and warms up. The compressor will then restart
again providing heat until the LWT again reaches 39° F. If this routine continues the heat pump may not be able
to maintain the temperature in the house and the backup heat will come on.
Possible causes would include:
1. Supply water filter that needs cleaning
2. Inadequate water supply
3. Water discharge line that is plugging up
4. Entering water temperature less than 50 degrees
Water Coil Maintenance
– Water quality is a major concern for open systems. Problems can occur from
scaling, particle buildup, suspended solids, corrosion, pH levels outside the 7-9 ranges, or biological growth. A
cupronickel heat exchanger is recommended for open loop applications. If poor water quality is known to exist
in your area a closed loop system may be the best alternative. Water coil cleaning on an open loop system may
be necessary on a regular basis.