Carrier AQUASNAP 30MPA Installation Instructions Manual

Also see for AQUASNAP 30MPA: User manual Operation and service manual Controls, start-up, operation, service, and troubleshooting

Contents

1130MPW UNITS — In order to minimize the water pressuredrop in the system, use as few bends as possible in the fieldwater piping, and run the lines as short as possible. Size thewater lines according to the available pump pressure (not neces-sarily the connection size), especially on cooling tower applica-tions. See Carrier System Design Manual, Part 3, Piping Design.See Fig. 12 for condenser pressure drops.Set water regulating valve, if installed, to maintain designhead pressure. Do not adjust to compensate for high head pres-sures caused by fouled condensers, excess refrigerant, or thepresence of noncondensables. Due to changes in water temper-ature, it may be necessary to adjust the valve seasonally. Afteradjusting for design head pressure, shut unit down. The waterregulating valve should shut off the flow of water in a few min-utes. If it does not, raise head pressure setting. Make sure thatthe capillary tube from each water regulating valve is connect-ed to the proper condenser access fitting.Provide a means for draining the system in the winter (if notused) and for maintenance.Water leaving the condenser is under pressure and shouldnot be connected directly into sewer lines. Check local codes.EVAPORATOR DESCRIPTION — All 30MP units use abrazed-plate heat-exchanger type evaporator. The heat ex-changer is constructed essentially the same as the brazed-platecondenser used on 30MPW units. See 30MPW Condenser De-scription section on page 10 for more details. Similar to thecondenser, the evaporator can only be chemically cleaned. SeeFig. 13 for evaporator pressure drops.EVAPORATOR PIPING — Plan evaporator fluid piping forminimum number of changes in elevation, and for the fewestnumber of bends possible. Install manual or automatic ventvalve at high points in the line. Maintain system pressure byusing a pressure tank or a combination of relief and reducingvalves.A strainer with a minimum of 40 mesh must be installedwithin 10 ft of the evaporator fluid inlet to prevent debris fromclogging or damaging the heat exchanger. This strainer is re-quired and is available as an accessory.See Carrier System Design Manual, Part 3, Piping Design,for chilled fluid piping details.The evaporator fluid inlet and outlet connections are victau-lic. The fluid enters at the top connection and leaves at the bot-tom connection. Procedures for making the connections are thesame as for the 30MPW condensers. See 30MPW Condensersection on page 10 for more details.Run the pump for 10 minutes, then clean the strainer beforestarting the unit.An evaporator flow switch is standard on all units. This is athermal dispersion type switch that is installed in evaporatorfluid outlet. The switch is set to open when the evaporator fluidflow drops below the minimum set point.For variable primary flow applications, it may be necessaryto adjust the flow switch set point to avoid nuisance trips. Con-tact Carrier service engineering for the method needed to adjustthe switch.See Table 5 for minimum flow rates. See Table 6 for mini-mum loop volume.Table 5 — Minimum Evaporator and CondenserFlow RatesTable 6 — Minimum Fluid Volume in CirculationLEGENDThe thermistors used to sense entering and leaving fluidtemperature are factory-installed in the evaporator entering andleaving fluid nozzles.AIR SEPARATION — For proper system operation, it isessential that water loops be installed with proper means tomanage air in the system. Free air in the system can causenoise, reduce terminal output, stop flow, or even cause pumpfailure due to pump cavitation. For closed systems, equipmentshould be provided to eliminate all air from the system.The amount of air that water can hold in solution dependson the pressure and temperature of the water/air mixture. Air isless soluble at higher temperatures and at lower pressures.Therefore, separation can best be done at the point of highestwater temperature and lowest pressure. Typically, this pointwould be on the suction side of the pump as the water is return-ing from the system or terminals. Generally speaking, this isthe best place to install an air separator, if possible.1. Install automatic air vents at all high points in the system.(If the 30MP unit is located at the high point of thesystem, a vent can be installed on the piping entering theheat exchanger on the ¼-in. NPT female port.)2. Install an air separator in the water loop, at the placewhere the water is at higher temperatures and lowerpressures — usually in the chilled water return piping.On a primary-secondary system, the highest temperaturewater is normally in the secondary loop, close to thedecoupler. Preference should be given to that point on thesystem (see Fig. 14). In-line or centrifugal air separatorsare readily available in the field.Fig. 11 — Install the Victaulic Couplinga30-1245UNIT SIZE EVAPORATOR CONDENSERGal./Min L/s Gal./Min L/s30MP015 22 1.4 22 1.430MP020 28 1.8 28 1.830MP030 43 2.7 43 2.730MP040 55 3.5 55 3.530MP045 64 4.0 64 4.030MP UNITSIZENORMAL AIRCONDITIONINGAPPLICATIONgal/ton (L per kW)PROCESS COOLING ORLOW AMBIENT OPERATIONAPPLICATIONgal/ton (L per kW)Std Unit HGBP Digital Std Unit HGBP Digital015 6 (6.5) 4 (4.3) — 10 (10.8) 10 (10.8) —020-030 6 (6.5) 4 (4.3) 3 (3.3) 10 (10.8) 10 (10.8) 6 (6.5)040-045 3 (3.3) 3 (3.3) 3 (3.3) 6 (6.5) 6 (6.5) 6 (6.5)HGBP — Hot Gas Bypass