Carrier AQUAZONE 50KQE Series Installation, Operation And Maintenance Instructions

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Carrier AQUAZONE 50KQE Series Installation, Operation And Maintenance Instructions Manual pdf 11 page image

113.4.2 - 220-Volt operationAll 220-240-Volt units are factory wired for 240 Volts. The trans-formers may be switched to 220-Volt operation (as illustrated inthe wiring diagram) by switching the red (220-Volt) wire withthe orange (240-Volt) wire at the PB(1) terminal.Fig. 8 - Typical field-installed wiringFIELD SUPPLIEDDISCONNECT SWITCHROOM THERMOSTATHEAT PUMPABField-supplieddisconnect switchHeat pump Room thermostatA = Two power wires for single-phase units.B = 1 heat/1 cool/manual or auto changeover remote 24-V thermostat.Note: All customer-supplied wiring to be copper only and must conform to nationaland local electrical codes. Wiring shown with dashed lines must be field-suppliedand field-installed. “B” wiring only required with systems using remote-mountedthermostats.CAUTION: Use copper conductors only to prevent equipmentdamage.WARNING: Disconnect electrical power source to preventinjury or death from electrical shock.3.5 - Low voltage wiring3.5.1 - Water freeze protectionThe Aquazone control allows the field selection of source fluidfreeze protection points through jumpers. The factory setting ofjumper JW3 (FP1) is set for water at -1.1∞C. In earth loop appli-cations, jumper JW3 should be clipped to change the setting to-12.2∞C when using anti-freeze in colder earth loop applications(see Fig. 9).3.5.2 - Accessory connectionsTerminal A on the control is provided to control accessory devicessuch as water valves, electronic air cleaners, humidifiers, etc.This signal operates with the compressor terminal (see Fig. 10).Refer to the specific unit wiring schematic for details.NOTE: The A terminal should only be used with 24-Voltsignals - not line voltage signals.3.5.3 - Water solenoid valvesWater solenoid valves may be used on variable flow systemsand ground water installations. A typical well water control valvewiring approach, which can limit waste water in a lockout con-dition, is shown in Fig. 10. A slow-closing valve may be requiredto prevent water hammer. When using a slow-closing valve,consider special wiring conditions. The valve takes approximately60 seconds to open (very little water will flow before 45 seconds)and it activates the compressor only after the valve is completelyopened by closing its end switch. When wired as shown, thevalve will have the following operating characteristics:1. Remain open during a lockout2. Draw approximately 25 to 35 VA through the “Y” signalof the thermostat.IMPORTANT: Connecting a water solenoid valve can overheatthe anticipators of electromechanical thermostats. Only userelay based electronic thermostats.3.5.4 - Optional wall-mounted thermostatThe 50KQE water-source heat pump units are built withstandard internal thermostats in either manual changeover(MCO) or automatic changeover (ACO) configuration (refer toFigs. 11-14).When desired, the unit can be furnished with a 24-Volt controlcircuit which is field-wired to a Carrier-supplied accessoryremote thermostat. Most heat pump thermostats can be usedwith the controller. Use a thermostat with Y, G, O and Woutputs. Refer to unit wiring diagrams in Figs. 15 and 16 andAquazone controls, operation and troubleshooting instructionsfor additional information.Vendor installation instructions and additional installationinformation is shipped with each thermostat.NOTE: Low-voltage wiring between the unit and the wallthermostat must comply with all applicable electrical codes(i.e., national and local codes), and be completed before theunit is installed.Table 3 lists recommended wire sizes and lengths to install thethermostat. The total resistance of low-voltage wiring must notexceed 1 ohm. Any resistance in excess of 1 ohm may cause thecontrol to malfunction because of high voltage drop.Table 3 - Recommended thermostat wire sizesWire size Max. wire length*18-Gauge 23 m16-Gauge 38 m14-Gauge 62 m* Length = Physical distance from thermostat to unit.Fig. 9 - Typical Aquazone control board jumperlocationsClip JW3when usinganti-freezeClip for drycontactbetweenAL1-AL2Aquazone control (complete control shown)Comp.relayTestDip switchesOff OnStatusLEDAlarmrelayFig. 10 - Typical Aquazone accessory wiringTypicalWaterValveCA24 VACTerminal StripTerminal strip24 V a.c. Typical water valve