Chapter 1 Description & Specifications General Description The ICE CFA1012A line of environmental control units (ECU) is designed for the telecommunication cabinet and shelter. Below are some of the features of the unit. • The CFA1012A is available in a cooling capacity of 12,000 BTUH. •...
General Operation Refrigerant Cycle (Cooling Mode) The CFA1012A uses R-410A refrigerant in a conventional vapor-compression refrigeration cycle to transfer heat from air in an enclosed space to the outside. A supply blower assembly pulls indoor air across the evaporator. Liquid refrigerant passing through the evaporator is boiled into gas by heat removed from the air.
Electronic Control Board Mode of Operation Normal 24 VAC power must be continuously applied to “R” and “C”. Upon a call for cooling “Y” and with the high pressure switch (HPS) closed, the compressor will be energized. (Note: See the delay on make feature.) The compressor will remain energized during the 3 minute timed low pressure by-pass cycle.
High Pressure Switch The high pressure switch is mounted on the liquid line. It is electrically connected to a lockout circuit on the board which shuts down the system if the refrigerant pressure rises to 650 PSIG. This protects the unit if airflow through the condenser is blocked or if the outdoor fan motor fails. Although the contacts of the high pressure switch close when the refrigerant pressure falls to approxi- mately 450 PSIG, the system must be manually reset once the lockout circuit is activated.
Chapter 2 Installation WARNING Failure to observe and follow Warnings and Cautions and these Instructions could result in death, bodily injury or property damage. Read this manual and follow its instructions and adhere to all Cautions and Warnings in the manual and on the ICE unit. Equipment Inspection Concealed Damage Inspect all cartons and packages upon receipt for damage in transit Remove cartons and check for...
4. Codes: Make sure your installation conforms to all applicable electrical, plumbing, building, and municipal codes. 5. Electrical Supply: The power supply must have the appropriate voltage, phase, and ampacity for the model selected. Voltage must be maintained above minimum specified values listed below. Refer to the Electrical Ratings (section 1.4) for ampacity requirements.
Additional Items Needed: Additional hardware and miscellaneous supplies (not furnished by ICE) are needed for installation. For example, the list below contains approximate quantities of items typically needed for mounting a unit on a concrete, fiberglass or steel frame structure. Concrete and fiberglass structures have different requirements.
system must be engineered to ensure sufficient air flow through the unit to prevent over-heating of the heater element. This includes proper supply duct sizing, sufficient quantity of supply registers, adequate return and filter area. Ductwork must be of correct material and must be properly insulated. Ductwork must be firmly attached, secured and sealed to prevent air leakage.
Mounting the Unit 1. Using an appropriate and safe lifting device, set the CFA1012A on the bottom support bracket mounted on the wall. You must stabilize the unit on the bracket with the lifting device or by some other means - the bracket alone is not sufficient. 2.
Chapter 3 Start-Up Start-Up & Commissioning Checklist Please complete the information on this form and return to Marvair by mail or fax. The mailing address and fax number can be found at the end of the form. A. Equipment Information Date: ________________Equipment Owner _______________________________________ Installing Company: _____________________________Installer: ____________________ Address: _______________________________________State _______________________...
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C. Check Rated Voltage at Terminal Block for Imbalance before starting of Unit. ❒208/230V 1 Phase ❒208/230V 3 Phase ❒460V 3 Phase ❒380V 3 Phase 50Hz. ❒575 3 Phase 60 Hz. Measured Line to Line Volts L1&L2_______V. L1&L3 ________V. L2&L3______V. (L1&L2 + L1&L3 + L2&L3)/3 = Avg.
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D. Heating Mode Check & Record Readings Circuit 1 Circuit 2 (if applicable) Room Temperature ________ ________ Outside Temperature ________ ________ Evap. Entering Air DB Temp ________ ________ Evap. Entering Air WB Temp ________ ________ Evap. Leaving Air DB Temp ________ ________ Evap.
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After 10 minutes of compressor operation, record the following: Circuit 1 Circuit 2 (if applicable) Room Temperature ________ ________ Outside Temperature ________ ________ Suction Pressure ________ ________ Suction Line Temperature ________ ________ Discharge Pressure ________ ________ Discharge Line Temperature ________ ________ Entering Condenser Air ________...
Chapter 4 Troubleshooting Overview WARNING Failure to follow these instructions could result in death, severe personnel injury and/or property damage. A comprehensive understanding of the operation of the CFA1012A is a prerequisite to troubleshooting. Please read the Chapter 1 for basic information about the unit. ICE CFA1012As are thoroughly tested before they are shipped from the factory.
PROBLEM/SYMPTOM LIKELY CAUSE(S) CORRECTION B. Unit runs for long periods or continu- 1. Dirty filter or reduced airflow 1. Check air filter(s). Check blower operation. Remove ously; cooling is insufficient. airflow restriction. 2. Low refrigerant. 2. Check for proper charge and possible refrigerant leak. 3.
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2. Running Amperage: Connect a clip-on type ammeter to the (common) lead to the compressor. Turn on the supply voltage and energize the unit. The compressor will initially draw high amperage; it should soon drop to the RLA value or less. If the amperage stays high, check the motor winding resistances.
Chapter 5 Maintenance Scheduled Maintenance Industrial Climate Engineering strongly recommends that the air conditioner be serviced a minimum of twice a year – once prior to the heating season and once prior to the cooling season. At this time the filters, evaporator coil, condenser coil, the cabinet, and condensate drains should be serviced as described below.
Chapter 6 Warranty Airxcel Commercial/Industrial Group Limited Product Warranty Marvair Inc., warrants its products to be free from defects in materials and workmanship under normal use to the original purchaser for the period of time in the table below. If any part of your product fails within 12 months from start-up, or 18 months from shipment from the factory, whichever comes first, Marvair, Inc.
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