Carrier 40UV Installation, Start-up And Service Instructions Manual

Also see for 40UV: Installation and service instructions Installation, Start-Up and Service Instructions

50START-UPStart-up procedures vary depending on time of year (sum-mer or winter) and building characteristics (new building/oldbuilding, occupied/unoccupied, etc.).Start-up in the cooling mode requires proper care to avoidcondensation problems. Condensation forms on surfaces thatare colder than the dew point of the surrounding air. If a unit isstarted and is piped with low-temperature chilled water in ahot, humid atmosphere, condensation will form on many partsof the unit. In order to avoid excessive condensation, highertemperature water should initially be used (approximately 65 to70 F). Also, the building should be as completely closed aspossible. Close the unit’s outside-air dampers. Bathroom andkitchen exhaust fans should be off.As the building temperature drops, the chilled water temper-ature can be gradually reduced until it reaches 50 F. At thispoint the outside-air damper can be opened to take in minimumoutside air. When the chilled water temperature is reduced to itsdesign point, the exhaust fans can be turned on.SERVICEPreventing Excessive Condensation on Unit —Excessive condensation can be caused by running chilled waterthrough a unit with the unit fan off. If fan cycling is used, a waterflow control valve should be installed to shut off the water whenthe fan stops.Other methods of control which avoid condensation prob-lems are as follows:1. If condensation is forming on the unit, verify the chilledwater valve is closing off tightly. Dirt or debris may pre-vent the valve from closing completely.2. Continuous fan operation with motorized chilled watervalve controlled by a thermostat.3. Continuous fan operation with thermostat control toswitch fan from high to low speed (instead of off).Check Drain — Check drain pan, drain line, and trap atstart of each cooling season. A standard type pipe cleaner for3/4-in. ID pipe can be used to be sure pipe is clear of obstructionso that condensate is carried away. Check the drain line at filtercleaning time during the cooling season. Be sure that debris hasnot fallen into unit through supply air grille.Fan Motor Bearings — Standard motors are perma-nent split capacitor, which are equipped with permanentlysealed and lubricated bearings. No lubrication is requiredunless special motors have been supplied or unusual operatingconditions exist.Fan Shaft Ball Bearing — These mid and inboardbearings are permanently sealed and lubricated. No additionalmaintenance is required. The end bearings must be lubricated atthe start of each cooling and heating season. Add 5 to 10 dropsof SAE 20 or 30 non-detergent based oil to the bearing.Clean Fan Wheel — For access to fan assembly, removedischarge grille (if supplied). If unit is connected to ductwork,remove front (40UV) or bottom (40UH) panel, separate fanshaft from motor at bushing, remove motor, and slide fanassembly from track. Use a stiff brush or vacuum to removedirt and debris from scroll. Wipe all fan surfaces with a dampcloth. Reassemble as necessary.Clean or Replace Air Filters — At the start of eachcooling season and after each month of operation (more or lessdepending on operating conditions), replace throwaway filteror clean permanent filter.THROWAWAY FILTER — Replace filter with a good qualityfilter of the correct size. Do not attempt to clean and reusedisposable filters. See Table 1 for filter sizes.PERMANENT FILTER (Fiber Type)1. Tap on solid surface to dislodge heavy particles.2. Wash in hot water. If needed, use mild solution of com-mercial solvent such as sal soda or trisodium phosphate.3. Set filter on end so that water drains out through slots inframe. Allow filter to dry thoroughly.4. Recharge filter with recharging oil. Three ounces is suffi-cient for a medium size filter. Oil may be applied byinsect spray gun. For easier spraying, the oil can bewarmed.If the filter is dipped in the recharging oil, remove itimmediately and allow to drain through slots in frame.5. Replace filter in unit.If another type of filter is used, follow the filter manufactur-er’s instructions.ECM Motor Removal and Reinstallation(Fig. 36) — Carrier unit ventilators utilize an ElectronicallyCommutated Motor (ECM) to drive the indoor fan.The ECM is a factory programmed motor that is standardwith factory-supplied controls (CCN) and units withoutfactory-supplied controls that are used in high-static applica-tions or high-capacity coils.The ECM is programmed with an algorithm that maintainsa constant torque as the static pressure on the system varies.For example, as the filter pressure drop increases due to dirt,the fan will increase speed (rpm) to maintain the cfm.The ECM is identified by the two electrical receptacleslocated on the housing. See Fig. 8A, 8B, and 36.The first receptacle is a 5-row in-line connector that feedsthe motor line voltage. This may be either 115 volts or230 volts. Units that are wired for 230 volts have a jumper be-tween terminals 1 and 2 on this plug (see wiring diagram).The second receptacle on the motor is a 16-pin connectorand is used for speed switching. This is a low voltage (24-volt)connection. There is a jumper wire between terminals 1 and 3.This is a 24-volt ground. Voltage is present at all times whenthe motor is energized.NOTE: A time delay exists between the time the motor speedis switched and the motor’s reaction. This is designed into theelectronics and does not indicate motor problems.When replacing the motor, note the following:• Check the part number of the old motor against that ofthe replacement. There is a tag indicating the eight-digitpart number and begins with UVE. This is the programnumber used for this motor.• The motor must be installed per the instructions below.It is important to maintain the dimension between thefan compartment bulkhead and the coupling.Lock out and tag all power supplies to equipment and con-trols prior to servicing unit. Follow all safety codes. Failureto do so could result in personal injury.IMPORTANT: If a replacement cooling shroud has beensupplied, it should be installed and the old onediscarded. The motor shroud directs cooling air acrossthe motor to provide proper cooling. Never run themotor without the cooling shroud in place. Ensurethe shroud inlet ring does not touch the motor; a gap of1/16 in. to 1/8 in. is acceptable.