Carrier AquaSnap 30RAP010-150 Installation Instructions Manual

Also see for AQUASNAP 30RAP010-150: Start up & operation manual Installation instructions Controls, start-up, operation, service, and troubleshooting Controls, start-up, operation, service, and troubleshooting

Carrier AquaSnap 30RAP010-150 Installation Instructions Manual Manual pdf 35 page image

35PREPARATION FOR YEAR-ROUND OPERATION — Ifthe unit is in operation year-round, add sufficient suitableinhibited antifreeze solution such as propylene or ethylene gly-col to chilled water to prevent freezing under low-ambienttemperature operating conditions. Consult a local water treat-ment specialist on characteristics of water and recommendedinhibitor.Motormaster® low ambient temperature head pressure con-trol is required if ambient temperatures are below 45 F (7 C) onsize 018-030 units, and 32 F (0° C) on size 035-150 units. Mo-tormaster control is standard on size 010 and 015 units.Accessory wind baffles are required with Motormaster headpressure control if the wind velocity is anticipated to be greaterthan 5 mph (8 km/h). Unit sizes 010-030 require one baffle andunit sizes 035-060 require two baffles. Unit sizes 070-150require one baffle. See Table 11.Table 11 — Wind Baffle Accessory QuantitiesFREEZE PROTECTION — The 30RAP units are providedwith a water strainer and a flow switch to protect against freez-ing situations that occur from no water flow. While the flowswitch (thermal dispersion) is helpful in preventing freezingduring no-flow situations, it does not protect the chiller in caseof power failure, or in other cases where water temperaturefalls below the freezing mark. Appropriate concentrations ofinhibited ethylene glycol or other suitable inhibited antifreezesolution should be considered for chiller protection where am-bient temperatures are expected to fall below 32 F (0.0° C).Consult local water treatment specialist on characteristics ofthe system water and add a recommended inhibitor to thechilled water.1. If the pump will be subjected to freezing temperatures,steps must be taken to prevent freeze damage. If thepump will not be used during this time, it is recommend-ed to drain the pump and hydronic package and thesecomponents back-flushed with inhibited glycol. Other-wise, a glycol-water solution should be considered as theheat transfer fluid. Units have a drain mounted on the pip-ing leaving the heat exchanger. Drains are located on thesheet metal base of all units.NOTE: Do not use automobile antifreeze, or any otherfluid that is not approved for heat exchanger duty.Only use appropriately inhibited glycols, concentratedto provide adequate protection for the temperatureconsidered.2. Use an electric tape heater for the internal piping (exclud-ing those within the pump box) if unit will be exposed tofreezing temperature.3. Ensure that power is available to the chiller at all times,even during the off-season, so that the pump and coolerheaters have power. Also make sure that the piping tapeheaters have power.4. On units with pump packages, a heater is supplied in thepump box that will protect this section from freezing inoutdoor-air temperatures down to –20 F (–29 C), exceptin case of a power failure.5. Cooler heaters that will protect down to –20 F (–29 C)can be installed as a factory option. It should be noted thatthese heaters will not protect the cooler from freezing inthe event of a power failure.PREPARATION FOR WINTER SHUTDOWN — Do notshut off power disconnect during off-season shutdown. At theend of the cooling season:1. Drain water from system.2. Replace drain plug(s) and add sufficient inhibited ethyl-ene glycol (or other suitable inhibited antifreeze) tocooler, pump and piping to prevent freezing of residualwater.3. At the beginning of the next cooling season, refill coolerand add recommended inhibitor.Step 5 — Make Electrical ConnectionsPOWER SUPPLY — Electrical characteristics of availablepower supply must agree with unit nameplate rating. Fieldwiring size and supply voltage must be within limits shown inTable 12. See Tables 13-24B for component electrical data.POWER WIRING — All power wiring must comply withapplicable local and national codes. Install field-suppliedbranch circuit fused disconnect per NEC (National ElectricCode, U.S.A.) of a type can be locked OFF or ON. Disconnectmust be within sight from and readily accessible from unit incompliance with NEC Article 440-14.General Wiring Notes1. The control circuit does NOT require a separate powersource. Control circuit power is obtained by a step-downtransformer from the main three-phase power supply. TheLVT (low voltage terminal) strip is provided for field-wired control devices.2. Cooler and pump heaters (if factory installed) are wiredin the control circuit so they are operable as long as themain power supply to the unit and heater safety device isON. A factory-installed and set overload device protectsthem.NOTE: The field-supplied disconnect should never be offexcept when unit is being serviced or is to be down for a pro-longed period, in which case cooler should be drained. Sinceall water cannot be drained completely, add an appropriateamount of inhibited glycol as noted for winter shutdown.IMPORTANT: Glycol antifreeze solutions are highlyrecommended since heater tapes provide no protectionin the event of a power failure.ACCESSORYPART NO.30RA-900---UNIT SIZE 30RAP010,015018,020025,030035,040045-060070-150054 1 — — — — —055 — 1 — 2 — —056 — — 1 — 2 —005 — — — — — 1CAUTIONTo avoid damage to refrigerant coils and electronic compo-nents, use extreme care when drilling screw holes andattaching fasteners.CAUTIONDo not circulate water through unit without strainer in place.Failure to use the strainer represents abuse and may impairor otherwise negatively affect the Carrier product warranty.WARNINGElectrical shock can cause personal injury and death. Shutoff all power to this equipment during installation. Theremay be more than one disconnect switch. Tag all disconnectlocations to alert others not to restore power until work iscompleted.IMPORTANT: Operating unit on improper supply voltageor with excessive phase imbalance constitutes abuse andmay affect Carrier warranty.