Carrier AQUASNAP 30RA010-055 Product Data

Also see for AQUASNAP JUNIOR 30RA015: User manual

Carrier AQUASNAP 30RA010-055 Product Data Manual pdf 38 page image

38Chiller locationDo not locate near sound sensitive areas without properacoustic consideration. Pad isolated from building rooftopmounting requires consideration for structure-borne trans-mission. Unit must be level within 1/ 8-in. per ft wheninstalled to ensure proper oil return to the compressors.Clearances must be provided around chillers for airflow,service and local code requirements. See dimensionaldrawings for specific unit clearance requirements. Chillerfan discharge must be at or above adjacent solid walls.Installation in pits is not recommended.Oversizing chillersOversizing chillers by more than 15% at design conditionsmust be avoided as the system operating efficiency isadversely affected (resulting in greater or excessive electri-cal demand). When future expansion of equipment isanticipated, install a single chiller to meet present loadrequirements and add a second chiller to meet the addi-tional load demand. It is also recommended that 2 smallerchillers be installed where operation at minimum load iscritical. The operation of a smaller chiller loaded to agreater percentage over minimum is preferred to operatinga single chiller at or near its minimum recommended value.Minimum Load Control should not be used as a means toallow oversizing chillers. Minimum Load Control should begiven consideration where substantial operating time isanticipated below the minimum unloading step.Cooler fluid temperature1. Maximum leaving chilled fluid temperature (LCWT)for unit is 60 F (16 C). Unit can start and pull downwith up to 95 F (35 C) entering-fluid temperature. It isrecommended that entering-fluid temperature notexceed 70 F (21 C).2. Minimum LCWT for standard unit is 40 F (3.3 C). Forleaving-fluid temperatures from 34 to 39.9 F (1° to3.28 C) a 20% anti-freeze solution, or greater isrequired. Application of chiller within the 39.9 to15 F (3.3 to –9.4 C) range is possible by ordering thefactory-installed ‘brine’ option.NOTE: Water flowing through cooler should not exceed100 F (38 C).Cooler flow/rangeRatings and performance data in this publication are for acooling temperature rise of 10° F (6° C), and are suitablefor a range from 5 to 20 F (2.8 to 11.1 C) temperature risewithout adjustment. The 30RA chillers may be operatedusing a different temperature range, provided flow limitsare not exceeded. For minimum flow rates, see Minimumand Maximum Cooler Flow Rates table. High flow rate islimited by pressure drop that can be tolerated. Use thePackaged Chiller Builder Program to obtain the rating if atemperature rise other than 10° F (6° C) is used.Minimum cooler flow (maximum cooler tempera-ture rise) — The minimum cooler flow for standard unitsis shown in Minimum and Maximum Cooler Fluid FlowRates table. When system design conditions require alower flow (or higher rise) than the minimum allowablecooler flow, follow the recommendations below.1. Multiple smaller chillers may be applied in series, eachproviding a portion of the design temperature rise.2. Cooler fluid may be recirculated to raise the flow rateto the chiller. However, the mixed temperature enter-ing cooler must be maintained a minimum of at least5° F (2.8° C) above the LCWT.NOTE: Recirculation flow is shown below.Maximum cooler flow — The maximum cooler flow(approximately 5° F [2.8° C] rise) results in a practical max-imum pressure drop through cooler.Return fluid may bypass the cooler to keep the pressuredrop through the cooler within acceptable limits. This per-mits a higher delta T with lower fluid flow through coolerand mixing after the cooler.NOTE: Bypass flow is shown below.MINIMUM AND MAXIMUM COOLER FLOW RATESENGLISHSI30RASIZEMIN. FLOWRATE (Gpm)MAX. FLOWRATE (Gpm)010 12 46015 16 66018 19 76022 25 98025 29 114030 33 131035 42 167040 45 181045 52 206050 57 227055 65 26030RASIZEMIN. FLOWRATE (L/s)MAX. FLOWRATE (L/s)010 0.76 2.90015 1.01 4.16018 1.20 4.79022 1.58 6.18025 1.83 7.18030 2.08 8.25035 2.65 10.52040 2.84 11.40045 3.28 12.98050 3.59 14.30055 4.10 16.38RECIRCULATION FLOWa30-4042BYPASS FLOWa30-533Application data