Carrier 42N *** S Series Installation And Operation Manual

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Carrier 42N *** S Series Installation And Operation Manual Manual pdf 13 page image

22English42N_S 42N_E 23English42N_S 42N_EControls Low Energy Consumption Fan MotorElectric heaters are controlled by “B”-type CARRIER control.The electric heaters are equipped with two safety thermostats, onewith automatic reset, the second with manual reset, to protect the unitagainst overtemperature that may happen in case of incorrect filtercleaning or obstructions of the air flow.NOTES:In the size 15 unit with “HIGH -LOW POWEr” heating element, the•ULOW speed wire (rED MOTOr WIrE) must be disconnected andinsulated.The LOW SPEED WIrE (YELLOW MOTOr WIrE) must be connectedin its place.In case of failure in the electric fan, replace the electric heater too.•Only qualified personnel should carry out this operation.T-o access the control box panel, remove the screw located at thebottom of the cover and delicately bend the tab to remove the cover.Connect the power supply to the electric heater terminal. Size thecables according to current drawn (see table III “Technical data ofelectric heater).It is important not to obstruct the supply or air flow and toperiodically check that the filter is clean.NOTE:The simultaneous use of hot water and electric heater is possiblein “ONLY LOW POWEr” mode. Electric heaters and hot water cannot be used in high power mode. To operate the additional heatingfunction you need to buy the 42N9084 kit and connect the specialsensor as described in the installation manual. After this, thecorresponding dip switch no. 5 of the type B control must be set toON.Fan MotorThe units have tangential/centrifugal motors with selectable speeds.There are 5 speeds available:Ultra Low- Low-Medium-High-Super High.All machines are configured at the factory as follows:ULTRA LOW - MEDIUM – SUPER HIGH.In the case of particular needs, it is possible to move the speedconnections (with Faston quick-connectors) following the enclosedtable and relative drawing (see Fig. 29).MOTOR SPEED CABLE COLORENGINEFACTORYCONNECTIONULTRA LOW RED REDLOW YELLOWMEDIUM WHITE WHITEHIGH ORANGESUPER HIGH BLACK BLACKMOTOR NEUTRAL BLUE BLUELow Energy Consumption Fan Motor versionThe fan coil units of the series 42NE… can ensure a 0% - 100% constantair flow modulation (and therefore the thermal and refrigeratingcapacity) thanks to the Inverter technology combined with the lastgeneration of high energy-efficient electric motors (EC brushless). Thisenables a constant control on the power supplied according to theroom that need to be conditioned. The result is 50% electric energysaving compared to traditional 3-speed asynchronous motors and aconsiderable reduction of acoustic emissions.The new range of fan coil units 42NE is equipped with 4 Low EnergyConsumption Fan Motors one of which is tangential and 3 centrifugal.The table below shows the electrical characteristics of the four types ofmotors.NOTE:The values showed on table are reported only at the Low Energy•Consumption Fan Motor to they are necessary add the controlinput power which correspond about 5WThe fan coil units of the series 42NE are submitted by Carrier to the NTCcontrol (see attached additional manual) for best regulation of roomtemperature.No further electrical connections are necessary (beside power supplyand communication bus)for this unit.All connections between electric components and motor are factorymade.In the centrifugal units, the inverter regulation board is directly installedon the motor frame and protected by a metal case.See fig. 42-43.Due to the lack of space, in the tangential units the regulation board isinstalled in the electric panel of the NTC controller.See fig. 41.42NE E19 E29 E39 E49MINIMUM SPEEDPOWEr INPUT (W) 4,5 4,6 6,6 9CUrrENT DrAWN (A) 0,057 0,061 0,076 0,09MAXIMUM SPEEDPOWEr INPUT (W) 14,5 14,5 30,1 60,9CUrrENT DrAWN 0,144 0,144 0,271 0,514Diagnostic warningsThe following alarm situations are indicated:Defective sensors: the red LED flashes.Possible causes:failure or short circuit of internal or remote sensor;•failure or short circuit of water temperature sensor (optional and only•on type “A” control).Incorrect configurationThe yellow LED flashes.This happens when:in type “A” control, both centralised seasonal changeover signals “RC•and RH” are enabled.AutotestThe autotest function is activated by holding the seasonal changeoverbutton pressed and at the same time pressing the “ ” button threetimes within 1 second.In this way it is possible to check the starting of all fan coils.The blue and red LEDs will begin to flash.Each of the various units will be activated for 10 seconds in the followingsequence:Low fan speed.Medium fan speed.High fan speed.CV Motorized cold-water valve.HV Motorized hot-water valve, or electric heater (only type “B”control versions).Elapsed 1 minute the control ends the test mode.Electric heaterMaintenanceIMPOrTANT:The following maintenance operations should be carried out byqualified personnel.Disconnect the mains power supply prior to any maintenanceoperations or prior to handling any internal parts of the unit.Air filterCheck and make sure the filter is cleaned every two months or moreoften if unit is located in a dusty room.A dirty filter reduces the air flow and unit efficiency.To inspect filter proceed as follows:switch the unit off;•loosen the two screws located at the base of the unit and the•corresponding plates and the corresponding plates or the rear closinggrille (if installed);lower the two guides and withdraw filter (See fig. 38)•clean the filter gently with soapy water or with a vacuum cleaner;•reinsert and position the filter in the guides, keeping the•photocatalytic filter tabs upwards as illustrated (See fig. 39)return the filter guides to their original position (See fig. 40)•tighten the screws and associated plates.•It is advisable to clean and if necessary replace the air filter beforethe winter season.Condensate drainingDuring the summer season check that the condensate drain is free fromdust and lint that could clog it, causing condensate water overflow.Heat exchanger coilAt the beginning of any winter and summer season it is advisable tocheck that the coil fins are not clogged with dust, lint or other foreignmatter.Clean the heat exchanger after having removed the supply grille, takingcare not to damage the fins.MotorThe motor is permanently lubricated.Therefore no periodical maintenance is required.Fan Motor