York CH012 Installation Instructions Manual

Contents

York CH012 Installation Instructions Manual Manual pdf 5 page image

036-33073-001 Rev. A (0701)Unitary Products Group 5TABLE 3: WATER VALVE SIZESWATER REGULATING VALVE –INSTALLATIONThe water regulating valve can be installed inside the com-pressor and condenser compartment on model CU units. It isrecommended that the water regulating valve be installedoutside the cabinet on model CH units.The water regulating valve is to be installed in the condenserwater inlet line to the unit within l8 inches of the inlet connec-tion on the unit. The capillary tube from the sensing bellowson the valve must be connected to the 1/4 inch male flareconnection, which is on the refrigerant liquid line in the con-denser compartment. To connect the valve sensing capillarytube to the unit, first remove the screw cap on the 1/4 inchflare nut on the end of valve sensing capillary tube. Makesure there is a Schrader valve core depressor inside the flarenut. If there is not, it will be necessary to use a separate 1/4flare male to I/4 inch flare female adapter, which does have aSchrader valve core depressor in it. If using one of theseadapters, first connect the capillary tube flare nut to theadapter. Then connect the adapter to the unit. If the capillarytube flare nut has a Schrader valve core depressor in it, con-nect the capillary tube flare nut directly to the unit male flarefitting. When one is making this connection, it is normal forsome refrigerant to escape as the valve core is being openedand the nut is being tightened. Complete the tightening of thenut as soon as possible to minimize the loss of refrigerant. Donot over-tighten, as this can cause the flare connection toleak. It is very important to leak test this joint as soon as theconnection has been completed. If a halide or electronicrefrigerant detector is not available, use a soapy water solu-tion. This leak test should also be repeated after the unit hasbeen running for several minutes when the normal operatingpressure will have been reached.The condenser water outlet connection should be piped to adrain or back to the cooling tower or chilled water systembeing used. It is recommended that manual shut-off valves beinstalled in both the condenser water inlet and outlet connec-tions so as to isolate both the unit and the water regulatingvalve from the rest of the piping system. A bibcock or aplugged tee fitting should be installed between the shut-offvalves and the unit in both the inlet and outlet pipes. Theseconnections are to provide for acid cleaning of the condenser,if this should become necessary.WATER REGULATING VALVE –ADJUSTMENTThe water regulating valve needs to be adjusted to maintain aleaving water temperature between 90°F and 100°F. If usinga refrigerant discharge pressure gauge, adjust the watervalve to maintain a condensing pressure of 170 to 220 PSIG.The valve is adjusted by turning the 1/4 inch square shaft ontop of the spring housing. Turning the adjusting screwcounter clockwise will raise the opening pressure and raisethe condensing pressure being maintained. Turning theadjusting screw clockwise will lower the opening point andlower the condensing pressure being maintained. If mainswater is being used, make sure the valve closes soon afterthe compressor stops. If the flow does not stop after a fewminutes, raise the opening pressure by turning the adjustingshaft counter clockwise until the flow stops.If the unit is running on mains water, we recommend adjust-ing the water regulating valve to give 100°F leaving watertemperature or 220 PSIG condensing temperature. This willgive the best compromise between low water flow and highoperating efficiency. If the condenser water is being re-circu-lated through a cooling tower or a chilled water system, it isrecommended that the water regulating valve to set for alower condensing temperature. This will provide higher effi-ciency, lower operating cost and a lower sound level. Theminimum condensing pressure required for satisfactoryexpansion valve operation is 170 PSIG. This corresponds to aleaving water temperature of 90°F.CONDENSATE DRAIN PIPINGThe drain connection on the unit consists of a 3/4 inch steelpipe socket. The cooling coil compartment and drain pan willbe under a negative pressure when the blower is running.Therefore, a P trap must be used in the drain line.It is recommended that a 3/4 inch drain line be run all the wayto an open drain. If it is not possible to reach an open drain bygravity flow, a pump kit, which is available as an accessory,can be mounted close to the unit.TABLE 4: R-22 REFRIGERANT CHARGERECOMMENDED VATER VALVE SIZEWater Cooling Tower Mains or Chilled Water60 to 90°F Supply Temp. 10°Rise40 to 60°F Supply Temp. 30°RiseUNIT/MODELValveSizeWaterFlowUS/GPMPress.Drop PSIValve &CondenserValveSizeWaterFlowUS/GPMPress.Drop PSIValve &CondenserCH/CU012 3/8 3.0 1.8 + 4.6 3/8 1.0 0.8 + 0.8CH/CU018 3/8 4.5 4.0 + 2.8 3/8 1.5 1.0 + 0.5CH/CU024 1/2 6.0 3.0 + 4.6 3/8 2.0 1.3 + 0.8CH/CU030 1/2 7.5 4.7 + 6.5 3/8 2.5 1.6 + 1.3CH/CU036 1/2 9.0 7.0 + 6.0 3/8 3.0 1.9 + 1.5CH/CU048 3/4 12.0 4.0 + 6.7 3/8 4.0 3.5 + 1.7CH/CU060 3/4 15.0 7.0 + 7.4 3/8 5.0 5.5 + 1.1UNIT SIZE CAPACITY TONS CH -HORIZ. CU –VERT.060 5 4 IBS. -10 oz. 4 lbs. -13 oz.048 4 3 lbs. -14 oz. 4 lbs. -1 oz.036 3 2 lbs. -10 oz. 2 lbs. -13 oz.030 2.5 2 lbs. -5 oz. 2 lbs. -7 oz.024 2 2 lbs. -2 oz. 2 lbs. -4 oz.018 1.5 1lbs.- 9oz. 1 Ibs.-10oz.012 1 1lbs. -2 oz. 1 IBS. -3 oz.