Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual

Also see for Aquasnap 30RAP010: Installation instructions Operation and service guide Product data Product data

Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual Manual pdf 26 page image

26Energy Management Module (Fig. 18) — Thisfactory-installed option (FIOP) or field-installed accessory isused for the following types of temperature reset, demandlimit, and/or ice features:• 4 to 20 mA leaving fluid temperature reset (requiresfield-supplied 4 to 20 mA generator)• 4 to 20 mA cooling set point reset (requires field-supplied 4 to 20 mA generator)• Discrete inputs for 2-step demand limit (requires field-supplied dry contacts capable of handling a 24 vac,50 mA load)• 4 to 20 mA demand limit (requires field-supplied 4 to20 mA generator)• Discrete input for Ice Done switch (requires field-supplied dry contacts capable of handling a 24 vac,50 mA load)See Temperature Reset and Demand Limit sections onpages 35 and 41 for further details.Loss-of-Cooler Flow Protection — A proof-of-cooler flow device is factory installed in all chillers. It is recom-mended that proper operation of the switch be verified on a reg-ular basis.Electronic Expansion Valves (EXV) — All units areequipped from the factory with EXVs. Each refrigeration cir-cuit is also supplied with a factory-installed liquid line filterdrier and sight glass.The EXV is set at the factory to maintain 9° F (5.0° C) suc-tion superheat leaving the cooler by metering the properamount of refrigerant into the cooler. The superheat set point isadjustable, but should not be adjusted unless absolutelynecessary.The EXV is designed to limit the cooler saturated suctiontemperature to 50 F (12.8 C). This makes it possible for unit tostart at high cooler fluid temperatures without overloading thecompressor.Capacity Control — The control system cycles com-pressors, digital scroll modulting solenoid (if equipped), andminimum load valve solenoids (if equipped) to maintain theuser-configured leaving chilled fluid temperature set point. En-tering fluid temperature is used by the main base board (MBB)to determine the temperature drop across the cooler and is usedin determining the optimum time to add or subtract capacitystages. The chilled fluid temperature set point can be automati-cally reset by the return fluid temperature, space, or outdoor-airtemperature reset features. It can also be reset from an external4 to 20-mA signal (requires energy management module FIOPor accessory).CAUTIONCare should be taken when interfacing with other manufac-turer’s control systems due to possible power supplydifferences, full wave bridge versus half wave rectification.The two different power supplies cannot be mixed.ComfortLink controls use half wave rectification. A signalisolation device should be utilized if a full wave bridge sig-nal generating device is used.CEBD430351-0396-01CTEST 1CEPL130351-01PWRTEST 2J1 J2J4 J3J5J6J7LENSTATUSRED LED - STATUS GREEN LED -LEN (LOCAL EQUIPMENT NETWORK) ADDRESSDIP SWITCHFig. 18 — Energy Management Module