Carrier Aquazone 50RHE 006 Installation, Operation And Maintenance Instructions

Contents

93.7 - Piping connectionsDepending on the application, there are three types of water-source heat pump piping systems to choose from: water loop,ground-water and ground-loop. Refer to piping section ofCarrier System Design Manual for additional information.All water-source heat pump units use low temperature solderedfemale pipe thread fittings for water connections to preventannealing and out-of-round leak problems which are typicallyassociated with high temperature brazed connections. Refer toTable 1 for connection sizes. When making piping connections,consider the following:• Use a backup wrench when making screw connections tounit to prevent internal damage to piping.• Insulation may be required on piping to avoid condensationin the case where fluid in loop piping operates at tempera-tures below dew point of adjacent air.• Piping systems that contain steel pipes or fittings may besubject to galvanic corrosion. Dielectric fittings should beused to isolate the steel parts of the system to avoid galvaniccorrosion.3.7.1 - Water loop applicationsWater loop applications usually include a number of unitsplumbed to a common piping system. Maintenance to any ofthese units can introduce air into the piping system. Therefore,air elimination equipment comprises a major portion of themechanical room plumbing.The flow rate is usually set between 0.040 and 0.054 l/s per kWof cooling capacity. For proper maintenance and servicing,pressure-temperature (P/T) ports are necessary for temperatureand flow verification.In addition to complying with any applicable codes, considerthe following for system piping:• Piping systems using water temperatures below 10°Crequire 13 mm closed cell insulation on all piping surfacesto eliminate condensation.• Avoid all plastic-to-metal threaded fittings due to thepotential to leak. Use a flange fitted substitute.• Teflon tape thread sealant is recommended to minimiseinternal fouling of the heat exchanger.• Use backup wrench. Do not overtighten connections.• Route piping to avoid service access areas to unit.• Flush the piping system prior to operation to remove dirtand foreign materials from the system.3.7.2 - Ground-water applicationsTypical ground-water piping is shown in Fig. 8. In addition tocomplying with any applicable codes, consider the followingfor system piping:• Install shut-off valves for servicing.• Install pressure-temperature plugs to measure flow andtemperature.• Connect boiler drains and other valves using a “T” connectorto allow acid flushing for the heat exchanger.• Do not overtighten connections.• Route piping to avoid service access areas to unit.• Use PVC SCH80 or copper piping material.NOTE: PVC SCH40 should not be used due to system highpressure and temperature extremes.Fig. 8 - Typical ground-water piping installationPressure-TemperaturePlugsBoilerDrainsStrainer – Field-Installed Accessory(16 to 20 mesh recommended forfilter sediment)Shut-OffValveWaterControlValveFlowRegulator PressureTankWater OutWater InFrom PumpWatercontrolvalveFlowregulatorPressure tankWater outWater inFrom pumpShut-off valveStrainer - field-installed accessory(16 to 20 mesh recommended forfilter sediment)BoilerDrainsPressure-temperatureplugs