Carrier AQUAZONE 50HQP072-120 Installation And Service Instructions Manual

Contents

15Step 10 — Install Field Control WiringTHERMOSTAT CONNECTIONS — The thermostat shouldbe wired directly to the Aquazone™ control board. SeeFig. 18 and 19.The thermostat should be located on an interior wall in alarger room, away from supply duct drafts. DO NOT locate thethermostat in areas subject to sunlight, drafts or on externalwalls. The wire access hole behind the thermostat may in cer-tain cases need to be sealed to prevent erroneous temperaturemeasurement.Position the thermostat back plate against the wall so that itappears level and so the thermostat wires protrude through themiddle of the back plate. Mark the position of the back platemounting holes and drill holes with a 3/16-in. bit. Install sup-plied anchors and secure plate to the wall. Thermostat wiremust be 18 AWG (American Wire Gage) wire. Wire the appro-priate thermostat as shown in Fig. 20 and 21 to the low voltageterminal strip on the Complete C or Deluxe D control board.Most heat pump thermostats will work with a Carrier unit,provided the thermostat has the correct number of heating andcooling stages.WATER FREEZE PROTECTION — The Aquazone controlallows the field selection of source fluid freeze protectionpoints through jumpers. The factory setting of jumper JW3(FP1) is set for water at –1.1 C. In earth loop applications,jumper JW3 should be clipped to change the setting to –12.2 Cwhen using antifreeze in colder earth loop applications. SeeFig. 18.AIR COIL FREEZE PROTECTION — The air coil freezeprotection jumper JW2 (FP2) is factory set for –1.1 C andshould not need adjusting.ACCESSORY CONNECTIONS — Terminal labeled A onthe control is provided to control accessory devices such aswater valves, electronic air cleaners, humidifiers, etc. This sig-nal operates with the compressor terminal. See Fig. 19. Referto the specific unit wiring schematic for details.NOTE: The A terminal should only be used with 24 voltsignals — not line voltage signals.WATER SOLENOID VALVES — Water solenoid valves maybe used on variable flow systems and ground water installa-tions. A typical well water control valve wiring which canlimit waste water in a lockout condition is shown in Fig. 18. Aslow closing valve may be required to prevent water hammer.When using a slow closing valve, special wiring conditionsneed to be considered. The valve takes approximately 60 sec-onds to open (very little water will flow before 45 seconds) andit 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 lockout.2. Draw approximately 25 to 35 VA through the “Y” signalof the thermostat.a50-6268tf.tifAQUAZONE CONTROL (Complete C Control Shown)Fig. 18 — Typical Aquazone™ Control BoardJumper LocationsIMPORTANT: The use of a slow-closing water solenoidvalve can overheat the anticipators of electromechanicalthermostats. Only use relay based electronic thermostats.TYPICALWATERVALVECA24 VACTERMINAL STRIP P2Fig. 19 — Typical Aquazone Accessory Wiring(Control D Shown)THERMOSTATCompressor-Stage 1Reversing ValveFan24Vac HotY1Y2OGRYOGRCompleteC 1YOGR24Vac Com C CCompressor-Stage 2CALALALCompleteC 2Fig. 20 — Thermostat Wiring to Complete C BoardTHERMOSTATCompressor-Stage 1Reversing ValveFan24Vac HotY1Y2OGROGRDeluxe D 1YOGR24Vac Com C CCompressor-Stage 2CAL1AL1ALY1Y2COM 2 COM 2Deluxe D 2Fig. 21 — Thermostat Wiring to Deluxe D Board