Remotely-installed Hydraulic Module

Transcription

1 Remotely-installed Hydraulic Module HDM Single or twin pump ACC-PRC001E-GB

2 Table of Contents Application Considerations Unit sizing...4 Unit placement... 4 Minimum water volume... 4 Selection Procedure...5 Performance and General Data...6 Mechanical Specifications Trane ACC-PRC001E-GB

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4 Application Considerations Optimum performance of the hydraulic module will be achieved only if proper application guidelines are followed. Where the application varies from the guidelines presented, it should be reviewed with your local Trane sales engineer. Unit sizing Hydraulic module has to be chosen in order to have enough static pressure available at a given water flow to overcome the pressure drop in the piping, the evaporator and in the terminal units. The static pressure available is given in Table 1. Unit placement Foundation A base or foundation is not required if the selected unit location is level and strong enough to support the unit s operating weight. Isolation and sound emission Structurally transmitted sound is reduced by using the four rubber pad isolators provided as standard. They have to be installed between the unit and the ground. An acoustics engineer should always be consulted on critical applications. Water drainage Ensure there is adequate drainage to drain away water from the unit in the event of shutdown or repair. Minimum water volume It is important to pay attention to the following parameters that have a great influence on the water temperature stability. Why water volume is an important parameter? The water volume is an important parameter because it allows a stable chilled water temperature and avoids short cycle operation of the compressors thus increase reliability and life span. Parameters which influence water temperature stability Number of capacity steps. Minimum time between two starts of a compressor. Water loop volume. Load fluctuations. Minimum water volume for a comfort application For comfort application we can allow water temperature fluctuation at part load. The parameter to take into account is the minimum operating time of the compressor. In order to avoid lubrication problem on a scroll compressor it must run at least 2 minutes (120 seconds) before it stops. The minimum volume can be determined by using the following formula Volume = Cooling capacity x Time / Number of steps / Specific heat / Dead band Minimum operating time = 120 seconds Specific heat = 4.18 kj / kg Dead band recommended = 3 C With these value the formula becomes Volume = Cooling capacity X 9.56 / Number of capacity steps Minimum water volume for a process application or for a chiller which has to run with ambient temperature below 0 C. For Process applications we have to minimise the water temperature fluctuation at part load. In order to avoid problems on a scroll compressor it must run at least 2 minutes (120 seconds) before it stops and the minimum time between two starts is 5 minutes (300 seconds). The water volume has to be able to provide the cooling capacity while the unit is shut down. The minimum volume can be determined by using the following formula Volume = Cooling capacity x Time / Number of steps / Specific heat / Dead band Minimum time = 180 seconds ( ) Specific heat = 4.18 kj / kg Dead band recommended = Function of the process With these value the formula becomes : Volume = Cooling capacity x 43 / Number of capacity steps / Dead band 4 ACC-PRC001E-GB

5 Selection Procedure To select a hydraulic module, the following information is required : Water flow. Static pressure required to overcome the pressure drop in the piping, the evaporator and in the terminal units. Selection example - Comfort application Unit size: CGCL 200 Nominal Delta T: 5 K Water flow: 1.8 l/s Water pressure drop in the evaporator: 25 kpa Water pressure drop in the piping: 60 kpa Water pressure drop in the terminal units: 20 kpa Total pressure drop in the air conditioning system: = 105 kpa Single pump Table 1 available pressure at the hydraulic module connection indicates that for 1.8 l/s, an HDM 1.1 single pump has an available pressure of 170 kpa. 105 kpa is required. The water flow required will be adjusted thanks to the balancing valve fitted as standard in the module. ACC-PRC001E-GB 5

6 Performance and General Data Table 1 - Available pressure at the hydraulic module connections Available pressure (kpa) HDM 1.1 HDM 1.1 HDM 2.2 HDM 2.2 Water flow (l/s) Single pump Twin pump Single pump Twin pump Table 2 - General Data HDM 1.1 HDM 2.2 Power supply (V/Ph/Hz) 400/3/50 400/3/50 Maximum water flow (l/s) Nominal power input (kw) Nominal amps (A) Starting amps (A) Expansion tank volume (l) Water tank volume (l) Water connection diameter (Inch) 1½ 2½ Water connection type ISOR7 male ISOR7 male Width (mm) Height (mm) Length (mm) Shipping weight with single pump (kg) Shipping weight with twin pump (kg) Single pump model Salmson LRL /1.1 LRL /2,2 Twin pump model Salmson JRL /1.1 JRL /2,2 * without water 6 ACC-PRC001E-GB

7 Mechanical Specifications The hydraulic module includes the following components : Pump Centrifugal pump, impeller dynamically balanced, directly mounted on the motor shaft. Motor bearings selected to obtain a quiet operation. Two pole motor (3000 RPM), class F, IP54 is protected with temperature sensor, automatic reset. Water tank The water tank is provided with an internal anti-corrosion protection to ensure long life. Expansion tank The expansion tank accommodates volume changes due to temperature changes in the chilled water circuit. It has an internal anti-corrosion protection. Strainer Cleanable water strainer avoiding evaporator fouling. Shut off valves placed before and after the strainer allows for easy maintenance. Antifreeze protection As an option, the hydraulic module can be provided with an electric heater to avoid freezing risk down to 10 C. Chilled water pump command The chilled water pump is controlled by the control module of the chiller. The water pump contactor can be provided as an option or as a kit. Circuit diagram of the hydraulic module 1 Isolating valve to allow the installation of a gauge 2 Valve for filling and emptying 3 Automatic air vent 4 Water tank 5 Expansion vessel 6 Safety valve (3 bars) 7 Ball valve 8 Strainer 9 Water pump 10 Optional twin pump 11 Balancing valve ACC-PRC001E-GB 7

8 Trane optimizes the performance of homes and buildings around the world. A business of Ingersoll Rand, the leader in creating and sustaining safe, comfortable and energy efficient environments, Trane offers a broad portfolio of advanced controls and HVAC systems, comprehensive building services and parts. For more information visit Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice Trane All rights reserved ACC-PRC001-GB November 2015 Supersedes ACC-PRC001-E4_0606 We are committed to using environmentally conscious print practices that reduce waste.