Airplane Flight Manual

14.8 lb at Station 244.6 d. Alternate Aft Installation (Ceiling Evaporator) 15.0 lb at Station 242.0 Alternate Aft Installation (Ceiling Duct) 6.0 lb at Station 183.0 SECTION III SERVICE AND MAINTENANCE MANUAL II. REQUIRED PUBLICATIONS TO INSTALL34-010-59 AIRCONDITIONER KIT INSTALLATION DRAWINGS: 34-010 (SHTS. 1, 2, & 4) GENERAL ARRANGEMENT AND INSTALLATION 34-050 (SHTS. 1 4) INSTALLATION COMPRESSOR/CONDENSER INSTALLATION MANUALS: 34-010-59 P/L COMPUTERIZED PARTS LIST 34-010-59M INSTALLATION INSTRUCTIONS (THIS DOCUMENT) SERVICE DOCUMENTS: TR128 AIRCONDITIONING SERVICE MANUAL DESCRIPTION - AIRCONDITIONING SYSTEM The KEITH Airconditioning unit is composed to two major 1) the equipment package and 2) the evaporator component installations: package. The Equipment Package comprises the compressor, drive motor, condenser fan, coil, and receiver drier. The Evaporator Package consists of the evaporator coil, blower, blower drive motor, and the expansion valve. The control for the system is located on the pilot's switch panel and consists of a simple on-off switch; some units carry a fan only position. When the switch is placed in the ON position, the compressor, driven by an electric motor, compresses the Freon gas to a high pressure and high temperature. This gas is routed to the condenser where cooling from the fan removes heat from the gas, condensing it to a liquid. The liquid is then stored in the receiver drier, adjacent to the compressor, until it is used. The Freon is metered to the evaporator through the expansion valve at a rate to allow all the liquid to evaporate and return to the compressor at a reduced pressure. The cabin heat is absorbed from air passing over the evaporator cooling fins. See Figure No. 1. CAUTION WHEN THE AIRCONDITIONER IS TURNED OFF, IT IS RECOMMENDED THAT A MINIMUM OF THREE MINUTES ELAPSE BEFORE IT IS TURNED ON AGAIN: THIS ALLOWS THE COMPRESSOR HEAD PRESSURE TO BLEED OFF AND BRING THE STARTING LOAD TO NORMAL. TROUBLE SHOOTING THE AIRCONDITIONING SYSTEM TROUBLE Insufficient or no cooling (Low side gauge reads High, High side gauge reads Low) (Low side gauge reads High, High side gauge reads High) (Low side gauge reads High, High side gauge reads High) (Low side gauge reads Low, High side gauge reads Low) Insufficient or no cooling (Gauges read pressure as normal) PROBABLE CAUSE Inoperative evaporator blower Complete loss of Freon charge Partial loss of Freon charge (continual foam in sight glass after turning system on). Compressor malfunction Head gasket failure or valves not seating Condenser malfunction Condenser Fan malfunction Condenser blocked Expansion Valve mal- function Expansion Valve mal- function Compressor belts broken Expansion valve in- operative, stays open or closed Moisture or air in system Inoperative compressor motor CORRECTION Check wiring, circui breaker, repair or r place blower Evacuate system. Recharge system and check for leaks. Recharge system and check for leaks. Replace compressor a) Check fan circuit to verify correct functioning. b) Blow out condens c) Replace condenser Purge system, re- place valve, evacuat and recharge. Purge system, re- place valve, evacuato and recharge. Service valves im- properly set (should be maximum counter clockwise). Replace belts. (Tension to 30 lbs.) Replace expansion valve. Evacuate system and re-charge (per charg procedure). Inspect wiring, circ breakers. Repair or replace compressor n 2. i TROUBLE SHOOTING THE AIRCONDITIONING SYSTEM (Cont'd) TROUBLE Noisy Compressor Noisy Fan PROBABLE CAUSE Loose, torn or mis- aligned belt Foreign material or damaged port in com- pressor Compressor loose on bracket Fan striking housing Fan shaft bearings out EVACUATION AND CHARGING PROCEDURES CORRECTION Align or replace belt. Remove and replace compressor. Tighten compressor. Check fan travel. Replace bearings. The evacuation and charging procedures given are factory recommended. If followed, these procedures will give optimum results. The following equipment must be available to properly service the air- conditioning system. a) Charging manifold and hoses b) Refrigerant can adapter c) R-12 refrigerant cans or R-12 cylinder d) Vacuum pump capable or operating at least 28 to 29 inches Hg e) 1/4" open end wrench CONNECTING THE MANIFOLD AND HOSE a) Remove caps from service ports on compressor b) Connect compound gauge (low pressure) hose to suction port c) Connect high pressure gauge hose to discharge port d) Close valves on the charging manifold (turn clockwise) 3 RECHARGING THE SYSTEM Whenever it becomes necessary to replace any of the refrigerant. components or lines, the refrigerant pressure must be discharged. Open oil filler plug in compressor until seal is broken and Freon escapes slowly. CAUTION EXERCISE CARE WHEN RELEASING REFRIGERANT GAS. THIS IS A HIGH PRESSURE SYSTEM: GOGGLES AND GLOVES SHOULD BE WORN FOR PROTECTION. EVACUATION OF THE REFRIGERANT SYSTEM a) Connect manifold and hose in accordance with Connecting Procedures. b) Connect center hose from charging manifold to vacuum pump and turn pump on. c) Open service valves halfway (turn counter clockwise) on compound gauge (low pressure). d) Continue to pull a vacuum on the system for 30 minutes after compound gauge reaches 28 inches or more on vacuum gauge. e) Periodically check for leaks by closing valves and verify- ing that system is holding vacuum. NOTE IN THE EVACUATING PROCEDURES GIVEN, THE SPECIFICATION FIGURE, 28 INCHES OF MERCURY OR MORE IS USED. THIS FIGURE IS ONLY ATTAINABLE AT OR NEAR SEA LEVEL. FOR EACH 1000 FEET OF FIELD ELEVATION WHERE THIS OPERATION IS BEING PERFORMED, LOWER THE SPECIFICATION FIGURE ONE- (1) INCH. f) Close hand valve (clockwise) on compound gauge. g) Turn off vacuum pump and disconnect from charging hose. CHARGING THE REFRIGERANT SYSTEM a) Connect manifold and hose in accordance with Connecting Procedures. CAUTION USE ONLY R-12 IN THIS SYSTEM b) Connect center manifold hose to R-12 can, using can ad- apter or R-12 cylinder. Open valve on can adapter or cylinder. c) Slightly loosen connect of center hose at manifold to purge any air trapped in hose. (This should take ap- proximately one second.) Tighten center hose connection. d) Open low side valve and do not exceed 40 PSI on low side gauge. NOTE MOST OF THE FIRST CAN WILL BE PULLED INTO UNIT SYSTEM BY VACUUM. e) Connect APU or start engines and turn on airconditioning system, refrigerant will begin to be pumped from the can into the condensing unit. f) Charge to a High Pressure Reading as follows: Ambient Temperature 80 F 90 F 95 F 100 F 105 F High Side Pressure 150 - 170 psi. 175 195 psi. ; 185 - 205 psi. 210 - 230 psi. 230 - 250 psi. - 40 psi.) (Low side reading should be 20 CHARGE ONLY UNTIL THE SIGHT GLASS IN THE RECEIVER DRIER IS CLEAR OF BUBBLES. g) Close hand valve (clockwise) on compound gauge and close valve on can adapter or cylinder. h) Disconnect charging hoses from high side unit. (Some re- frigerant trapped in the hoses will be expelled at this time and sound as though the system is leaking. This is normal.) i) Back seat service valves (fully counter clockwise); replace caps on suction and discharge ports. 5.