Carrier 30HXC Installation, Operation And Maintenance Instructions

Also see for 30HXC Series: Installation, operation and maintenance instructions Installation, operation and maintenance instructions

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Carrier 30HXC Installation, Operation And Maintenance Instructions Manual pdf 38 page image

38NOTE: Before this operation we recommend draining the circuitand disconnecting the pipes to be sure that the bolts are correctlyand uniformly tightened.9.5 - Frost protection9.5.1 - Standard machineIf the chiller or the water piping is in an area where the ambienttemperature can fall below 0°C it is recommended to add anantifreeze solution to protect the unit and the water piping to atemperature of 10 K below the lowest temperature likely to bereached at the installation site. Use only antifreeze solutions,approved for heat exchanger duty. If the system is not protectedby an antifreeze solution and will not be used during the freezingweather conditions, draining of the cooler and outdoor piping ismandatory. Damage due to freezing is not covered by the warranty.IMPORTANT: Depending on the climatic conditions in your areayou must:• Add ethylene glycol with an adequate concentration to protectthe installation up to a temperature of 10 K below the lowesttemperature likely to occur at the installation site.• If the unit is not used for an extended period, it isrecommended to drain it, and as a safety precaution addethylene glycol to the heat exchanger, using the waterentering purge valve connection (a purge connection isavailable somewhere on the heat exchanger water box incase the machine is not perfectly level).At the start of the next season, refill the unit with waterand add an inhibitor.• For the installation of auxiliary equipment, the installermust comply with basic regulations, especially for minimumand maximum flow rates, which must be between the valueslisted in the operating limit table (application data).9.5.2 - Brine machine30HXC brine applications below 0°C leaving brine temperatureare not compatible with stopped situations where water flow ismaintained in the evaporator and stopped in the condenser.The water flow in the evaporator should preferably be stoppedafter unit shut down. If this is not possible, then the flow must bemaintained in the condenser too.In all cases, it is recommended to maintain the water flow in thecondenser few moments after the evaporator flow stopped to allowsafe pressure equilibrium.Special attention has to be given to the hydraulic design whenoption 152 is selected, in order to maintain the condenser floweven when the 0-10V signal asks for no-flow.9.6 - Operation of two units in master/slave modeThe control of a master/slave assembly is in the entering waterand does not require any additional sensors (standard configuration).It can also be located in the leaving water. In this case twoadditional sensors must be added on the common piping.All parameters, required for the master/slave function must beconfigured using the Service Configuration menu. All remotecontrols of the master/slave assembly (start/stop, setpoint, loadshedding etc.) are controlled by the unit configured as master andmust only be applied to the master unit.Each unit controls its own water pump. If there is only onecommon pump, in cases with variable flow, isolation valves mustbe installed on each unit. They will be activated at the openingand closing by the control of each heat pump (in this case thevalves are controlled using the dedicated water pump outputs). Seethe 30GX/HXC Pro-Dialog Plus Control IOM for a more detailedexplanation.30HXC with configuration: leaving water control9.3.2 - Condenser water flow switch (30HXC)The use of a condenser water flow switch is recommended. Theflow switch is not supplied, and must be installed on site andconnected in accordance with the wiring diagrams.The condenser water flow rate must be set to 10 l/s.9.4 - Evaporator and condenser for the 30HXC waterbox bolt tighteningThe evaporator (and condenser) are of the shell and tube typewith removable water boxes to facilitate cleaning. Re-tighteningor tightening must be done in accordance with the illustrationbelow.Water box tightening sequenceLegend1 Sequence 1: 1 2 3 4Sequence 2: 5 6 7 8Sequence 3: 9 10 11 122 Tightening torqueBolt size M16 - 171 - 210 Nm1 2Legend1 Master unit2 Slave unitControl boxes of the master and slave unitsWater inletWater outletWater pumps for each unit (included as standard for units with hydronicmodule)Additional sensors for leaving water control, to be connected to channel 1of the slave boards of each master and slave unitCCN communication busConnection of two additional sensors