Carrier 42 GW***B series Installation Manual

2742 GW...BEnglishFresh air renewal and conditioned airsupply to an adjacent roomSee fig. 44 - 45.Side knockouts allow connection of fresh air inlet ducts and ducts to•deliver conditioned air to an adjacent room.Remove the external prepunched anti-condensate insulation and•take away the knockout panels using a punch.Air distribution to adjacent roomWith a pencil, trace a line on the polystyrene around the inside edges ofthe panel that was previously removed.Cut away the polystyrene with a knife, taking care not to damage theheat exchange coil.Fresh air intakeRemove the polystyrene partition.Introduce the baffle supplied after the frame has been hooked as perabove figure.Following that tighten the assembly frame/grille using the 4 screws.Use locally purchased material, suitable for operating temperatures•of 60 °C (continuous). Conduits can be of flexible polyester (withspiral core) or corrugated aluminium, externally covered with anti-condensate material (fibre glass of 12 +/- 25 mm thickness).To complete the installation, all non-insulated ducts must be covered•with anti-condensate insulation (ex. expanded neoprene, 6 mmthickness).If these instructions are not observed, condensate may drip; themanufacturer will not be held responsible for any damage caused.The two prepunched side knockouts must not be used at the same•time to deliver conditioned air to an adjacent room.The return and supply duct lengths can be calculated in accordance•with the "air distribution to an adjacent room" and "fresh air renewal"diagrams (also taking into account the pressure drop through airdiffusers, grilles and fresh air filters), as well as the increase in noisecaused by these ducts.Fresh air renewal (See fig. 46)The optional supplementary fan for fresh air intake (field supplied)•has to be connected to terminal block as per diagrams enclosed.Fan motor operation is parallel to the thermo-electric control valve,and the motor stops when the valve shuts off.For winter operation with fresh air intake, an anti-freeze thermostat•set at 2°C is recommended, with the bulb placed on the water outletpipe, before the supplementary fan.The fresh air flow must be less than 10% of the total air flow, to avoid•operating problems or eccessive noise. For higher air flow a "primaryair kit" is available which uses the prepunched hole for air ducting toan adjacent room and a baffle so that the fresh air is introduced intothe room through a diffuser.Install an air inlet grille with filter inspection port to prevent dust•and dirt from entering and fouling the unit heat exchanger. Filterinstallation also makes the installation of a duct closing damperduring shut-down periods unnecessary.Conditioned air supply to an adjacent room(See fig. 47)Air supply to an adjacent room requires that the outlet•corresponding with the duct is closed, using the air supplyoutlet obstruction kit supplied. the kit cannot be used in unitsequipped with electric heater (mod. 42GWE).An air inlet grille must be fitted (if possible near the floor) betweenthe air conditioned room (where the unit is situated) and the adjacentroom or, alternatively, the door must be undercut, as shown in thedrawing.The duct lengths can be calculated in accordance with the “air•distribution to an adjacent room” diagram, also taking into accountthe pressure drop through air diffusers and fresh air filters.Do Not use active carbon or electrostatic filter kits for ducts•towards adjacent rooms.