Amana Bottom Mount Refrigerator service manual Component Function and Testing

Component Function and Testing

Capacitor	Run capacitor connects to relay terminal.
					WARNING
					To avoid electrical shock w hich can cause severe personal
					injury or death, discharge capacitor through a resistor before
					handling.
		1.	Disconnect pow er to refrigerator.
		2.	Remove capacitor and disconnect capacitor w ires.
		3.	Discharge capacitor by shorting across terminals w ith a resistor for
			1 minute.
		4.	Check resistance across capacitor terminals w ith ohmeter set on
			"X1K" scale.
			• Needle should jump tow ards 0 ohms and quickly move back to
				infinity.
			•	If needle does not move, the capacitor is open.
			•	If needle reads a constant value at or near 0 ohms, the capacitor is
				shorted.
			•	If needle jumps tow ards 0 and then moves back to a constant high
				resistance (not infinity), the capacitor has a high resistance leak.
Capillary tube	Capillary is sized in diameter and length to
	feed proper amount of refrigerant to
	evaporator.
	Capillary is soldered to suction line to transfer
	heat from capillary and add additional
	superheat to gas refrigerant in compressor
	suction line.
	Capillary discharges into evaporator.
Compressor	When compressor electrical circuit is energized, the	Check for resistance betw een:
	start w inding current causes PTC relay to heat. After an	Terminals "S" & "C"
	amount of starting time the start w inding circuit turns	Terminals "R"& "C"
	off. PTC relay w ill sw itch off the start w inding circuit
	even though compressor has not started (as w hen	Ground Test
	attempting to restart after momentary pow er	Disconnect pow er to refrigerator .Remove compressor leads and use an
	interruption).	ohmmeter set on highest scale. Touch 1 lead to compressor body (clean
	With "open" PTC relay, compressor w ill not start	point of contact) and the other probe to each compressor terminal. If a
		reading is obtained, compressor is grounded and must be replaced.
	because there is little or no current to start w indings.
	Overload protector w ill open due to high locked rotor	Operation Test
	run w inding current.	If motor w inding tests fail to show cause for failure:
	With "shorted" PTC relay or capacitor, compressor w ill	1.	Disconnect pow er to refrigerator. Wire a test cord to disconnect
			sw itch.
	start and overload protector w ill quickly open due to	2.	Place time delayed fuse, w ith U.L. rating equal to amp rating of motor,
	high current of combined run and start w indings.		in test cord socket.
	With open or w eak capacitor, the compressor w ill start	3.	Remove overload and relay.
		4.	Connect start, common, and run leads of test cord on appropriate
	and run as normal but w ill consume more energy.		terminals of compressor.
		5.	Attach capacitor leads of test cord together. If capacitor is used,
			attach capacitor leads to a good capacitor of same capacity.
		6.	Plug test cord into volt-w att meter to determine start and run w attage
			as w ell as check for low voltage w hich can also be a source of
			trouble.
		7.	With pow er to volt-meter, press start cord sw itch and release. If
			compressor motor starts and draw s normal w attage compressor is
			okay and trouble is in capacitor, relay, overload, freezer temperature
			control, adaptive defrost control, or elsew here.

RS1200001 Rev. 1 20 April 1998