JOAP - Pressureswitches

Installation Instructions Pressure connection of the control must always be located on the top side of the refrigerant line or within 10 to 2 o’clock as shown in picture below. This reduces the possibility of sediment collecting inside the pressure sensing element which could cause the control to malfunction. In addition, the location of the tap point shall always be as indicated below, so that the safety function of the control is not defeated. Avoid Severe Pressure Pulsation on High-Side Pressure Connections. Install controls pressure away from the compressor discharge, to minimize the effects of pressure pulsation generated by reciprocating compressors. Fastening Torque To avoid any damage to the controls, the below instructions must be carefully followed: - The allowable fastening torque for copper or brass flare connections shall be within 13,5 to 15Nm - Do Not Over-Tighten Flare Nuts on Pressure Connection Fittings: over tightening flare connections may damage the threads on the flare nuts or flare connectors, and result in refrigerant leaks - Use two wrenches to apply the torque. Do not use control’s body for installation Control’s calibration may permanently change if excessive side loads have been applied to control’s body. Installing / Brazing Controls with Copper Tubes To assure a proper brazing, is recommended to follow the following instructions: - the connection areas shall be reasonably free from heavy oxides - during brazing do not aim torch toward the plastic body of the control - protect the tube with- a wet cloth to reduce the overheating during brazing process - recommended maximum soldering time: 15 seconds (using wet cloth) - max temperature allowed to the bottom of the tube (near the body): 100°C - do not shorten the length of the copper tube less than 35 mm: shorter tubes cause loss of calibration due to excess heat reaching the pressure sensing element - to prevent overheating, the torch tip should be held away from the surface of the work so that the inner cone of the flame is not in contact with the work piece. In manual torch brazing, the torch should be kept in motion to avoid localized overheating and should be kept on the more massive part. A multiple torch is recommended as it will heat faster and more uniformly than a single flame. Note: Flux is not ordinarily needed when brazing copper alloys. Note: overheating will cause the internal switch to fail.