Mini-Space Series Installation, Operation & Maintenance Manual

Mini-Space Series Installation, Operation & Maintenance Manual1.5.1 Electric Box AccessThe electrical components are protected behind thefront, hinged access door located on the right side ofthe unit. The electric box door is locked in 2 places.To open the access door, turn the door locks with thetriangular key wrench provided. The electric box dooris also safety interlocked with the main power servicedisconnect switch preventing the door from openingwhen the switch is in the “On” position. The switchmust be turned “Off” to gain access to the electricalcompartment.The service disconnect switch may be used to turnthe unit off for emergency shutdown or when routinemaintenance is performed. The handle of the switchmay be locked in the “Off” position to prevent unintendedoperation.1.5.2 Circuit Breakers / Motor Start ProtectorsIndividual overload protection is provided by circuitbreaker(s) and motor start protectors. These switchesmust be manually reset once the overload conditionis cleared.1.5.3 Heaters (Optional)Heaters may be furnished for reheating the supplyair, as required to offset the sensible cooling of thesystem during the dehumidification cycle, and forthe automatic heating mode. As a standard, electricresistance heating elements are factory installed inthe supply airstream to heat the supply air.As an option, hot water reheat may be selected. A hotwater heating coil is factory installed in the supply airstream to heat the supply air. A valve is provided tocontrol the flow of hot water through the coil to maintainthe correct reheat temperature.1.5.4 Coil(s)The cooling and optional hot water reheating coils arealuminum fi nned/copper tube construction. The coilsare leak tested and cleaned before installation by thefactory.1.5.5 BlowerThe unit is equipped with a centrifugal blower withforward curved blades. The blower is dynamically andstatically balanced to minimize vibration. The bloweris contained in a double-width, double-inlet housing.The blower motor is ODP industrial duty. Smallerunits, models CCU/D-41/121, use a direct drive blowerwhich may be adjusted via a fan speed controllerlocated in the electric box.(©April, 2008)Larger units, models CCU/D-171/201 use a belt driveblower. The motor is mounted on an adjustable basefor belt tensioning and is furnished with an adjustablepitch sheave to adjust the blower speed.1.5.6 Temperature/Humidity SensorAs a standard for room air control, a temperature/humidity(T/H) sensor is factory mounted in the returnair stream. The (T/H) sensor monitors the return airconditions and provides input signal(s) to the systemcontroller to manage the operation of the A/C unitconsistent with the setpoints entered in the systemcontroller. As an option, sensor(s) may be shippedloose for fi eld installation. Refer to the electricaldrawing supplied with your unit for details specifi c toyour system.1.6 Optional Equipment1.6.1 Humidifier (Optional)Mini-Space systems may utilize an optional electrode,steam humidifi er. The humidifi er is factoryinstalled inside the air conditioner and includes fi lland drain valves and associated piping. Operationof the humidifi er’s fill and drain cycles is based onwater conductivity and is maintained by the humidifiercontroller. An operating manual for the humidifier isprovided under separate cover. Refer to that manualfor detailed information on operation of the humidifi er.1.6.2 Condensate PumpAn optional condensate pump may be used for automaticremoval of condensate from the air conditionerand fl ush water from the humidifi er. An internal overflo w safety switch is wired to the system controllerto automatically shut down the precision A/C systemshould an overfl ow occur.1.6.3 Smoke DetectorOptionally mounted in the return air stream, a photoelectricsmoke detector is used to sense the presenceof smoke and signal the controller when asmoke alarm condition exists.1.6.4 FirestatOptionally mounted in the return air stream, a fi re detectorsenses high return air temperature and signalsthe controller when a fi re alarm condition exists.1-7Air Technology Systems, Inc.