Carrier Atmosphera 42EM series Installation Instructions Manual

Also see for Atmosphera 42EM series: Manual Installation, operation and maintenance instructions

Contents

Carrier Atmosphera 42EM series Installation Instructions Manual Manual pdf 12 page image

12• 42EM units equipped with factory-installed Carriercontroller: Fig. 14.• Units without electronic control: access to six selectablefan speeds from outside at the optional terminal block:Fig. 15 (15a = customer connection, 15b = motor).Wiring for 42EM 2.1/2.2/2.3 and 42EM 3.1/3.2/3.3: Fig. 1642EM size 2.1 42EM size 2.2 42EM size 2.342EM size 3.1 42EM size 3.2 42EM size 3.3Neutral (com) 1 White White WhitePhase connected 2 Red Blue BlackNot connected 3 Blue Red RedNot connected 4 Black Black BlueWiring legend:Minimum speed = Terminal 6 Medium speed = Grey wire (14b)Maximum speed = Terminal 1 High speed = Black wire (14c)Low speed = Red wire (14a) L = Live4.2 - Water coil4.2.1 - Coil removal procedureWARNING: Disconnect the power supply to the Atmospherabefore carrying out any work on the unit.• Close the isolating valves on the manifolds.• Unscrew the union nuts to disconnect the flexiblewater pipes.• Remove the valve actuators taking care to identify thecooling and heating valves.• Disconnect the flexible condensate drain pipe which isheld in place by a collar (the collar is not supplied byCarrier).• Remove the two-way or four-way water flow controlvalve bodies. Depending how the Atmosphera is con-figured, the four-way valve coupling may be fitted witha heating/cooling changeover switch, if so do notremove it.• Remove the 4 torx screws (T20) and slide out the coiland drain pan assembly.• Replacement is by the reversal of the procedure des-cribed above. Ensure that all gaskets are changed (newgaskets fitted) and that the inlet and outlet connectionsto the coil are made correctly using an appropriatesealing compound applied to the valve body.• Bleed all air from the coil during refilling.ATTENTION: It is advisable to tighten the valve body tothe coils with caution (15 N·m is sufficient) to ensure theyare not damaged.NOTE: It is possible to change the coil connection on siteby changing the condensate pan and coil assembly in theguides.For Size 3 the water inlet and outlet need to be reversedto achieve the published performance.4.2.2 - Coil inlet/outlet positionsWater inlets/outlets, sizes 0.5, 1 and 2: Fig. 18.Water inlets/outlets, size 3: Fig. 19.ATTENTION: Carefully observe the direction indicatedby the arrow on the valves, based on the connection sideand the valve type.4.3 - Duct connection spigotsThese are manufactured from high density plastic with aVO fire rating, more or less equivalent to class M1 (Frenchstandard). They are encased inside the unit. The ductsshould be fixed to these spigots using circular collars oradhesive. Screws and rivets should not be used.WARNING: In order to guarantee good air tightness, theduct should overlap the whole of the spigot.Make sure that the maximum supply air temperature doesnot exceed 60°C.Do not lift or support the unit using the spigots, place loadson the spigots or damage the spigots during installation oroperation.4.4 - optional filter and filter access4.4.1 - DescriptionThe Carrier Atmosphera is fitted with a 85% gravimetricfilter (G3), according to standard EN 779. Medium firerating M1, metal wire frame.Different filter access options are available to suit differentsite requirements:• Unit with non-ducted return air: Access is from therear of the unit.• Unit with ducted return air: Access is from below.4.4.2 - Air filter replacementAir filters should be changed regularly. Filter life depends onthe rate at which the filter becomes clogged, which dependsupon the cleanliness of the working environment.If clogged filters are not changed they can increase the airpressure drop, trapped dust particles may be given off andentrained in the air supply, and the general performance ofthe Atmosphera may be degraded (as the air flow reduces).NOTE: When installing an Atmosphera in a ceiling void,check that no T-bars will obstruct filter access and removal.4.5 - Fresh air controller4.5.1 - Fresh air controller with constant air volumeThe 42EM Atmosphera can be fitted with a constant freshair flow controller allowing the introduction of fresh air andthe air change rate to be controlled.The following range of fresh air controllers is available:Option a: 8.3 l/s (30 m 3/h) (-10%; +20%)Option b: 16.6 l/s (60 m 3/h) (-10%; +20%)