Mini-Space Series Installation, Operation & Maintenance Manual

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Mini-Space Series Installation, Operation & Maintenance Manual4.2 TroubleshootingTurn off all power to the unit before conducting any troubleshooting procedures, unless the procedure specificallyrequires the system to operate. For troubleshooting purposes, the system may be operated withthe doors open by using a pair of channel lock pliers to turn the shaft of the main power disconnect switchto the “On” position. When the switch is turned on, high voltage will be present inside the cabinet.WARNINGTo prevent injury, keep hands, clothing and tools clear of the electrical terminals and rotating components.Ensure that your footing is stable at all times.SYMPTOM PROBABLE CAUSE RECOMMENDATIONSuction Pressure Too Low a. Loss of refrigerant (bubbles in Locate leak and repair. Recharge system.sight glass).b. Expansion valve stuck or obstructed Remove and clean or replace valve.(short cycle or continuous running).c. Clogged drier/strainer (feels cold). Replace with new drier/strainer.d. Dirty air fi lters (reduced airflow). Clean/replace fi lters.Water/Glycol Valve Fails a. Temperature setpoint too high. Adjust to correct temperature setting.to Open or Closeb. No control power to the valve. Valve actuator is wired incorrectly. Checkwiring schematic and rewire if required.c. Actuator failed. Replace actuator.Evaporator Coil Ices a. Low airfl ow. 1. Check filters. Replace as needed.2. Check for and clear any obstructionsacross or in the (supply) dischargeairstream.3. Check correct rotation of evaporatorblower.4. Check evaporator blower speed.5. Check clearance height of raised floor.b. Temperature setting too low Increase temperature setpoint.(68°F min.).c. Discharge air short cycling Check discharge grille orientation.back to return.d. Low refrigerant charge. Find leak, repair and recharge system.Blower Fails to Start a. Power failure. Check main voltage power source inputcable.b. Control transformer circuit Check for short circuit or ground fault, ifbreaker tripped.none reset circuit breaker.4-5(©April, 2008)Air Technology Systems, Inc.
Mini-Space Series Installation, Operation & Maintenance ManualSYMPTOM PROBABLE CAUSE RECOMMENDATIONBlower Fails to Start(cont.)c. Defective contactor. Repair or replace.d. Condensate switch open. 1. Ensure unit is level.2. Check that condensate pan is drainingproperly. Clear obstructions.e. Motor starter protector tripped. Reset motor starter protector and checkamperage of motor. Compare to settingon motor starter protector and adjust toFLA.Control is Erratic Wiring improperly connected or broken. Check wiring against schematic diagram.Condenser Pressure a. Noncondensable gas or air in the Recover system, vacuum to 50 micronstoo High system. and recharge. Install new drier/strainer.b. Condenser air intake is blocked. Remove debris and clean condenser.c. Overcharge of refrigerant. Reclaim excess refrigerant from system.d. Low water/glycol flow to Determine cause and fix.condenser.e. Condenser fan not operating. Check pressure/temperature operatingswitches and motor. Replace as needed.f. Water/glycol temperature too high. Check flow and operation of drycooler.g. Condenser pressure regulating valve Adjust to obtain correct pressure.setting too high.h. Flow of water/glycol too low. 1. Check glycol solution level andconcentration.2. Valves not open or partially open.Repair/replace as needed.3. Air in system - bleed system.4. Check all strainers and clean if needed.i. Water/glycol solution not mixed prior Remove solution and premix.to adding to system.Refill system.Condenser Pressure too a. Loss of refrigerant (indicated by Locate and repair leak. Recharge system.Lowbubbles in sight glass).b. Condenser fan controls not set Adjust or repair controls.properly.c. Water regulating valve adjusted Readjust to 240-250 psig.too low.(©April, 2008)4-6Air Technology Systems, Inc.
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Mini-Space Series Installation, Operation & Maintenance Manual

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