Carrier 52SE Installation, Operating And Maintenance Instructions

Contents

13OPERATING CONTROLSThe following controls are located on the right side ofthe chassis. (See Figure 20.) To obtain access to op-erating controls, remove the unit front panel as shownon page 2. FAN CYCLE SWITCH — (Not available on RCunits.) This allows the fan to operate in two modes:CON — This setting allows the fan to run continu-ously, circulating air even when the temperature set-ting has been satisfied. This switch helps to maintainthe room temperature closer to the thermostat setting.Use this switch position when maximum comfort isdesired.CYC — This setting allows the fan to cycle on and offwith the compressor during heating or cooling. The fanstops when the temperature setting is satisfied. Thisresults in longer unit off-time and wider variations inroom temperature and humidity. OUTDOOR THERMOSTAT (52SQ HEAT PUMPUNITS ONLY) — If the setscrew is left at the factorysetting (in the fully clockwise position), the unit willoperate in the reverse cycle heating mode. The controlis the defrost thermostat in this mode. The 52SQ ther-mostat sensing capillary is located between the fins ofthe outdoor coil. When the temperature at the capil-lary reaches 25° F, the outdoor frost thermostat closes,shutting off the compressor and energizing the electricheater. The electric heater remains on until the tem-perature at the outdoor thermostat capillary reaches40° F; then the electric heater is shut off and the com-pressor is energized. To set unit to operate in electricheat mode only, turn the setscrew to the fully counter-clockwise position. Once in electric heat mode, thecompressor is disabled for heating and cooling. VENT CONTROL — See Adjustments on page 10for vent operating information.CARE AND MAINTENANCEIn order to maintain proper performance of your pack-aged terminal air conditioner or heat pump, it is veryimportant that the fan and outdoor coils, the blowerwheel, blower scroll, electric heater, and all drain pas-sages are thoroughly cleaned at least once per year.Carrier recommends that as a minimum, the cleaningshould be conducted prior to the start of each heatingseason. The air inlet filter should be cleaned everymonth.Depending on local conditions, more frequent clean-ing of the unit may be required to ensure optimumperformance and long operating life. Examples ofthese special conditions include areas where construc-tion dust or heavy airborne dirt is found, or environ-ments that promote the growth of fungus.AIR INLET FILTER AIR INLET FILTER should be cleaned once eachmonth.1. If front panel has not been removed, remove panelas shown in Figure 2. To remove filter, grasp twofilter tabs and pull the filter forward (Figure 21).IMPORTANT: When unit is first started, highhumidity conditions can cause condensation toform on grille. Keep doors and windows closed.Room humidity decreases and moistureevaporates.Some local conditions and environments can causefungi to grow inside the air conditioner, especiallyon indoor blower section. Dried fungi, dirt and otherforeign material are fire hazards. Be sure to cleanunit according to the instructions that follow.HEATPUMPELECTRICHEATVENTCLOSEDOPENCONCYCOUTDOORTHERMOSTAT(ON HEATPUMP ONLY)FAN CYCLESWITCH(NOT ON RCUNITS)VENTLEVERHEATMODEHEATPUMPELECTRICNOTE: ELECTRIC HEATMODE WILL DISABLECOMPRESSOR OPERATING.52SQ506082 REV-VENT OPEN/CLOSEDFIGURE 20 — TYPICAL 52S SERIESOPERATING CONTROLS