Carrier Aquazone 50PTH036 Installation, Start-up And Service Instructions Manual

Also see for Aquazone 50PTH024: Installation, Start-Up and Service Instructions

28NOTE: Cooling always overrides Reheat mode. In the Coolingmode, the unit cools and dehumidifies. If the cooling thermo-stat is satisfied but there is still a call for dehumidification, theunit will continue to operate in Reheat mode.COMPLETE C AND DELUXE D BOARDSYSTEM TESTTest mode provides the ability to check the control opera-tion in a timely manner. The control enters a 20-minute testmode by momentarily shorting the test terminals. All time de-lays are sped up 15 times. The follow operations are commonto both Complete C and Deluxe D controls.Retry Mode — In Retry mode, the staus LED will flashthe code for the corresponding fault. If the fault clears and therthermostat call (Y) is still present the Complete C or Deluxe Dcontroller will run the compressor once the ASC (anti-short cy-cle) timer has expired and will try to satisfy the call. If the callis satisfied the unit will resume its normal operation.If 2 or 4 consecutive faults occur (depending on the DIPswitch setting) within 1 hour, the controller will lock the com-pressor operation out and will flash the alarm code on the statusLED as well as alarm dry contact output. When the CompleteC or Deluxe D controller enters lockout mode the alarm willalso be shown on the panel mounted LED.LED Fault Indication — Two LED indicators are pro-vided. The GREEN power LED indicates 18-30 VAC presentat the board.The RED LED is a fault indicator with blink codes as follows:• One Blink = High pressure lockout• Two Blinks = Low pressure lockout• Three Blinks = Freeze sensor lockout• Four Blinks = Condensate overflow• Five Blinks = BrownoutBoard Default Settings — The board will come fromthe factory with the following default settings:• Freeze — “Terminals not jumped” on all the time• Temp — 30 F• Lockout — 2• Reset — Y• Alarm — PULSE• Test — NO• Dry Contact — Normally Open (NO)SERVICEPerform the procedures outlined below periodically, asindicated. An annual “checkup” is recommended by a licensedrefrigeration mechanic. Recording the performance measure-ments of volts, amps, and water temperature differences (bothheating and cooling) is recommended. This data should becompared to the information on the unit’s data plate and thedata taken at the original start-up of the equipment.Periodic lockouts almost always are caused by air or waterflow problems. The lockout (shutdown) of the unit is a normalprotective measure in the design of the equipment. If continuallockouts occur call a mechanic immediately and have themcheck for: water flow problems, water temperature problems,airflow problems or air temperature problems. Use of the pres-sure and temperature charts for the unit may be required toproperly determine the cause.Filters — Filter changes or cleanings are required at regularintervals. The time period between filter changes will dependupon type of environment the equipment is used in. In a singlefamily home, that is not under construction, changing or clean-ing the filter every 60 days may be sufficient. In other applica-tions such as motels, where daily vacuuming produces a largeamount of lint, filter changes may be need to be as frequent asbiweekly. See Fig. 1-3 for replacement filter sizes. Note thathorizontal units containing two filters are taped together at thefactory to facilitate removal. This should be done by end useras new filters are installed..Water Coil — Keep all air out of the water coil. Checkopen loop systems to be sure the well head is not allowing airto infiltrate the water line. Always keep lines airtight.Inspect heat exchangers regularly, and clean more frequent-ly if the unit is located in a “dirty” environment. Keep the heatexchanger full of water at all times. Open loop systems shouldhave an inverted P trap placed in the discharge line to keepwater in the heat exchanger during off cycles. Closed loopsystems must have a minimum of 15 psig during the summerand 40 psig during the winter.Check P trap frequently for proper operation.Condensate Drain Pans — The condensate drainshould be checked annually by cleaning and flushing to ensureproper drainage.Refrigerant System — Verify air and water flow ratesare at proper levels before servicing. To maintain sealed circuit-ry integrity, do not install service gages unless unit operationappears abnormal.Check to see that unit is within acceptable superheat andsubcooling temperature range. If the unit is not within theseranges, recover and reweigh in refrigerant charge.Compressor — Conduct annual amperage checks to en-sure that amp draw is no more than 10% greater than indicatedon the serial plate data.Fan Motors — All units have lubricated fan motors. Fanmotors should never be lubricated unless obvious, dryoperation is suspected. Periodic maintenance oiling is NOTrecommended as it will result in dirt accumulating in the excessWARNINGTo prevent injury or death due to electrical shock or contactwith moving parts, open unit disconnect switch before ser-vicing unit.IMPORTANT: When a compressor is removed from thisunit, system refrigerant circuit oil will remain in the com-pressor. To avoid leakage of compressor oil, the refrigerantlines of the compressor must be sealed after it is removed.IMPORTANT: All refrigerant discharged from this unitmust be recovered without exception. Technicians must fol-low industry accepted guidelines and all local, state and fed-eral statutes for the recovery and disposal of refrigerants.IMPORTANT: To avoid the release of refrigerant into theatmosphere, the refrigerant circuit of this unit must only beserviced by technicians who meet local, state and federalproficiency requirements.IMPORTANT: Units should never be operated withouta filter.CAUTIONTo avoid fouled machinery and extensive unit clean-up,DO NOT operate units without filters in place. DO NOTuse equipment as a temporary heat source duringconstruction.