| US 7,559,207 B2 | ||
| Method for refrigerant pressure control in refrigeration systems | ||
| John Terry Knight, Moore, Okla. (US); Anthony William Landers, Yukon, Okla. (US); Patrick Gordon Gavula, Oklahoma City, Okla. (US); and Stephen Blake Pickle, Norman, Okla. (US) | ||
| Assigned to York International Corporation, York, Pa. (US) | ||
| Filed on Jun. 23, 2005, as Appl. No. 11/159,878. | ||
| Prior Publication US 2006/0288716 A1, Dec. 28, 2006 | ||
| Int. Cl. F25B 41/00 (2006.01) | ||
| U.S. Cl. 62—196.4 [62/115] | 22 Claims |
| 1. A method for controlling refrigerant pressure in an HVAC system comprising the steps of:
providing a compressor, a condenser and an evaporator connected in a closed refrigerant loop, the condenser having a header
arrangement capable of distributing refrigerant to a plurality of refrigerant circuits within the condenser and capable of
selectively isolating at least one of the circuits from refrigerant flow;
providing at least one valve arrangement capable of controlling refrigerant flow into and out of at least one of the circuits
that can be selectively isolated from refrigerant flow;
sensing refrigerant pressure at a predetermined location in the refrigeration system;
isolating at least one of the refrigerant circuits, in response to the sensed refrigerant pressure;
selectively drawing refrigerant from the at least one refrigerant circuit isolated from refrigerant flow into the refrigerant
loop to increase the refrigerant pressure in the refrigerant loop; and
selectively drawing refrigerant into the at least one refrigerant circuit isolated from refrigerant flow from the refrigerant
loop to decrease the refrigerant pressure in the refrigerant loop.
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