Mini-Space Series Installation, Operation & Maintenance Manual

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Mini-Space Series Installation, Operation & Maintenance ManualSYMPTOM PROBABLE CAUSE RECOMMENDATIONNoisy Compressor a. Expansion valve stuck in open Ensure feeder bulb is tight on suction line.position (abnormally cold suction line). Check operation and superheat.b. Broken compressor valve Replace compressor.(compressor knocking, suctionpressure rises faster than 2lbs/minafter shutdown).c. Worn or scarred compressor Replace compressor.bearings.d. Liquid slugging. System overcharged. Reclaim excessrefrigerant.e. Scroll compressor not properly Phase correctly at main power source.phased.DO NOT REWIRE THE COMPRESSORCompressor Fails to Start a. Temperature setpoint too high. Adjust to desired temperature.b. Compressor internal protector Check compressor for short circuitis open.or ground.c. Complete loss of refrigerant charge Locate and repair leak. Recharge system.(low pressure safety switch).d. Condenser pressure too high Check condenser for obstructions.(high pressure safety switch).e. Minimum off time has not expired. Wait for time to expire.System Short of Capacity a. Low refrigerant (indicated by bubbles Check for leaks. Repair and rechargein sight glass).system.b. Expansion valve stuck or obstructed Remove valve and clear obstruction or(short cycling or continuous running). replace valve.c. Clogged drier/strainer (feels cold). Replace with new drier/strainer.d. Reduced airfl ow. Check belt tension, filters andevaporator coil.Compressor Short Cycles a. Low line voltage causing Check power source for cause of lowcompressor to overheat.line voltage.b. Dirty or iced-over evaporator coil. Defrost and/or clean coil.c. Reduced airfl ow. Check filter and belt tension (whenapplicable).d. Lack of refrigerant. Check for leak. Repair and rechargesystem.4-7(©April, 2008)Air Technology Systems, Inc.
Mini-Space Series Installation, Operation & Maintenance ManualSYMPTOM PROBABLE CAUSE RECOMMENDATIONCompressor Short Cycles e. Short cycling of conditioned air. 1. Supply and/or return grilles are(cont.)incorrectly oriented. Reorient.2. Supply and return grilles are too closetogether. Move further apart.heat load to compensate.3. Insufficient heat load. Add temporaryf. Remote temperature sensor is Check for supply registers that mayimproperly located.be too close to the remote temperaturesensor. Relocate if necessary.Heater Inoperative a. Fuses blown. Check for short circuit, replace fuse.b. Temperature setpoint too low. Increase temperature setpoint.c. Overheat switch open. Insufficient air across heater elements.Check for dirty filters or obstructions thatmay reduce air flow. Correct or replaceas needed.d. Manual reset overheat safety Reset manual overheat safety switchswitch tripped.(See item immediately above).e. Heater element burned out. Check continuity with an ohmmeter.Replace heater element.Humidifier Inoperative a. Water supply has been turned off Connect and/or turn on water supply.Note: See Humidifier or not connected.Manual for AdditionalHelp. b. Humidifi er switch is in “Off” position. Turn switch to “Auto/On” position.c. Electrical connections are loose. Tighten electrical connections.d. Humidifi er circuit breaker tripped. Check for over current by the humidifierelectrodes. Drain water from tank andrefi ll. Reset circuit breaker.e. Relative humidity is above setpoint. Adjust humidity setpoint.f. Electrode canister change cylinder 1. Consult humidifier manual.light is on.2. Water conductivity is too lowand water is at the top of thecylinder (see next item).g. Water conductivity is too low. Add a teaspoon of table salt to the waterthrough the top of the cylinder. Typicallyonly on initial start-up.(©April, 2008)4-8Air Technology Systems, Inc.
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