Maytag PCF2700ACW Service Manual page 6

Component Testing
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test
procedures require power to be connected. Discharge capacitor through a resistor before attempting to service.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
Component Description
Overload / Relay When voltage is connected and relay is
cool, current passes through relay to start
winding.
After a short time, current heats the
resistor in relay and resistance will rise
blocking current flow through relay.
Start winding remains in the circuit through
run capacitor.
Solid state relay plugs directly on
compressor start and run terminals. Relay
terminals 2 and 3 are connected within
relay. Run capacitor is connected to relay
terminal 3. L2 side of 120 VAC power is
connected to relay terminal 2.
Fresh Food Fresh Food temperature control is a
temperature capillary tube operating a single pole,
control single throw switch.
Fresh Food temperature control controls
run cycle through defrost timer.
Altitude Adjustment
When altitude adjustment is required on a
G.E. control, turn altitude adjustment
screw 1/7 turn counter clockwise for each
1,000 feet increase in altitude up to 10,000
feet. One full turn equals 10,000 feet
maximum.
In most cases the need for altitude
adjustments can be avoided by simply
turning temperature control knob to colder
setting.
Evaporator fan Evaporator fan moves air across
motor evaporator coil and throughout refrigerator
cabinet.
Switch, refrigerator Double pole, double throw switch
light, completes circuit for light when door is
open and completes a circuit for
evaporator fan when door is closed.
6
!
WARNING
Test Procedures
1. Disconnect power to the refrigerator.
2. Remove relay cover and disconnect leads.
3. Check resistance across terminals 2 and 3 with an ohmmeter:
Normal = 3 to 12 ohms
Shorted = 0 ohms
Open = infinite ohms
Check for proper calibration with thermocouple capillary in air supply well by
recording cut-in and cut-out temperatures at middle setting. Refer to tech sheet
for model being serviced for expected temperatures.
Check control contacts are opening by disconnecting electrical leads to control
and turning control knob to coldest setting. Check for continuity across
terminals.
Altitude Counter in Feet
Turn Screw
Feet Above Clockwise (Angular
Sea Level Degrees)
2,000 30
4,000 81
6,000 129
8,000 174
10,000 216
1. Disconnect power to unit.
2. Disconnect fan motor leads.
3. Check resistance from ground connection solder. Trace to motor frame must
not exceed .05 ohms.
4. Check for voltage at connector to motor with unit in refrigeration mode and
compressor operating.
Check resistant across terminals.
Switch button depressed
"NO" terminals
Switch button not depressed
"NC" terminals
16023030 Rev. 0
0
330
30
300
270
240
210
150
180
Open
Closed
©2004 Maytag Services
60
90
120