HEAD PRESSURE CONTROL VALVES - Фригодизайн

1 CATALOG 301 Page 47 HEAD PRESSURE CONTROL VALVESHigh and Low Ambient Stability The design of air conditioning systems utilizing air cooled con-densing units involves two main problems that must be solved if the system is to operate reliably and ambi-ent and low ambient operation. If the condensing unit is properly sized, it will operate satisfactorily during extremely high ambient temperatures. However, some units will be required to operate at ambient temperatures below their design dry bulb temperature dur-ing most of the year, the solution to low ambient operation is more good head PRESSURE CONTROL during low ambient opera-tion, the system can experience both running cycle and off-cycle problems.

2 Since the PRESSURE differential across the thermostatic expansion valve port affects the rate of refrigerant flow, low head PRESSURE generally causes insufficient refrigerant to be fed to the evaporator. Failure to have sufficient head PRESSURE will result in low suction PRESSURE and/or iced evaporator primary off-cycle problem is refrigerant migration to the condenser. Insufficient flow through the TEV will cause a low suc-tion typical method of maintaining normal head PRESSURE in a re-frigeration system during periods of low ambient temperature is to restrict liquid flow from the condenser to the receiver, and at the same time divert hot gas to the inlet of the receiver.

3 This backs liquid refrigerant up into the condenser reducing its capacity which in turn increases the condensing PRESSURE . At the same time the hot gas raises liquid PRESSURE in the receiver, allowing the system to operate Head PRESSURE CONTROL for systems with air cooled con-densers can be accomplished using one of several valve options; the non-adjustable OROA-5, the adjustable ORI/ORD combina-tion, or the economical LAC by Under writers Laboratories, Inc. Guide SFJQ 2 File No. SA5 4 6 0 Specifications and DimensionsFor complete information consult your nearest Sporlan Wholesaler or email europecold @ and request Bulletin 9 0-3 TYPESTANDARDFACTORY SETTINGbarCONNECTIONS ODF SOLDER (Inches)DIMENSIONS mmWEIGHTkgREPL ACEMENT PARTSINLET(S)OUTLETABCDEFGINETSHIPORI-6- 65.

4 Strainer825-57/87/882 5-71-1/ 81-1/ 81-1/ 8280139167 / 81-3 / 88 2 5 . , 5/82 5/85 5/82 7/87/8157102546182 5-7 ORI 6 65/225 7/ 8 ODF With Strainer HValve Type:Open on Rise of Inlet PressurePort Size Eighths of an InchNominal Adjustment Range (psig)Connections - SolderInlet Strainer (Optional)Designates High PRESSURE BellowsOROA 5 180 5/ 8 ODF With Strainer ORD 4 20 Valve Type: Open on Rise of Outlet PressurePort Size Eighths of an InchPressure Set ting (psig)Connections - SolderInlet Strainer (Optional)Valve Type:Open on Rise of Differential PressurePort Size Eighths of an InchOpening PRESSURE Differential (psi)CBAR eceiverCondenserBC92 mmADDischargeReceiverCondenserABORIOROAO RD-4 ORI Valve Nomenclature/Ordering InstructionsOROA Valve Nomenclature/Ordering Instructions ORD-41 Discharge Connection 2 Condenser ConnectionPage 48 CATALOG 301 HEAD PRESSURE CONTROL VALVESLAC 4 DS 100 /180 3/8 x3/8 x3/8 ODFV alve Type.

5 Low AmbientControlValve SizeDual Set ting Omit for standard dome elementValve Set ting (s) (psig)Specify one set ting for standard dome elementDischarge Connection (Inches)Condenser Connection (Inches)Receiver Connection(Inches)Solder ConnectionsLAC 5 180R 5/8 x5/8 x3/8 ODFV alve Type:Low AmbientControlValve SizeValve Set ting (s) (psig)Indicates Remote Bulb Model Delete for standard dome elementDischarge Connection (Inches)Condenser Connection (Inches)Receiver Connection(Inches)Solder mmDischargeReceiverCondenserDCEAB92 mmDischargeReceiverCondenserD3L102 mm19mm92 mmR3 LLAC-4 LAC-4-DSLAC-5 & 10 LAC Valve Nomenclature/Ordering Instructions To eliminate shipment delays, specify complete valve designations.

6 VALVE TYPESTANDARDFACTORY SETTINGbarCONNECTIONS ODF SOLDER (Inches)DIMENSIONS mmWEIGHTkgREPL ACEMENT PARTSINLET(S) , . ElementsNot Available3/83 Dome Element : D3L (specify set ting) or Non-Adjustable Remote Bulb Element : R3L (specify set ting)5/85 81-1/ AC-101 1-3 / 82 7/87 1-3 / 82 1-1/ 81-1/ Discharge Connection2 Condenser ConnectionSpecifications and DimensionsCATALOG 301 Page 49 REFRIGERANTV alve Setting (bar)MINIMUM AMBIENT DESIGNTEMP. CPRESSURE DROP ACROSS VALVE (bar)VALVE TYPEREFRIGERANTV alve Setting (bar)MINIMUM AMBIENT DESIGNTEMP. CPRESSURE DROP ACROSS VALVE (bar)VALVE TYPELAC-4 LAC-5L AC-10 OROA-5 ORD-4 LAC-4 LAC-5L AC-10 OROA-5 ORD-422407C( bar) 404A( bar) 32 7.

7 7. 46 7. 0 7. 7. 7. 67 7. 6134a( bar) 507( bar) .127. 3 217. 6 7. 23 7. 7. 05 7. 3 3 .14 2 . 4 .16 4 . 7. 7. ( bar) 2 7. Low Ambient (WINTER) Capacities kW of RefrigerationCapacities are based on -20 C evaporator temperature, 35 C condenser, 6 C subcooled PRESSURE CONTROL VALVESREFRIGERANTPRESSURE DROP ACROSS VALVE (bar)VALVE TYPEREFRIGERANTPRESSURE DROP ACROSS VALVE (bar)VALVE TYPELAC-4 LAC-5L AC-10 OROA-5 ORI-6 ORI-10 ORD-4 LAC-4 LAC-5L 7. 7. 65 7.

8 9 817. 23 0116 83 7. 2 . 7. 43 42 7. 8 2 . 7. 0 7. 59 4 .1 03 7. High Ambient (SUMMER) Capacities kW of RefrigerationCapacities are based on -20 C evaporator temperature, 43 C condenser, 6 C subcooled complete information consult your nearest Sporlan Wholesaler or email europecold @ and request Bulletin 9 0-3 0.