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 TM 55-1905-219-14-9
4-37. REFRIGERATOR/FREEZER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
REPAIR (Cont)
12.
Control
OPERATION: The control is a S.P.S.T. snap
acting toggle switch that automatically cycles to
CLOSE the circuit on rise and OPEN the circuit
on drop of pressure within the refrigeration
system.
RANGE ADJUSTMENT: With the dial knob on
the Range adjustment screw, turn it counter
clockwise to raise, or clockwise to lower both the
" ut-out" points TOGETHER, according to the
c
graduations on the visible scale plate.
INTERCHANGING CONTROL KNOB
To Reset Controls - (Note the position of the
indicators on the scale plate before making an
OVER DIFFERENTIAL SCREW
adjustment).
" UT-OUT is CUT-IN less
C
DIFFERENTIAL" is on the scale plate. Use the Assemble to this position when control knob is to be used
Range Screw to adjust the " ut-in" point, then use for decreasing or increasing the differential to change " ut-
c
c
the Differential Screw to change the " ut-out" out" ONLY.
c
,
setting.
NOTE
DIFFERENTIAL ADJUSTMENT: The control dial
Adjustment Screws are slotted for screw drive use.
knob is generally furnished on the Differential
Screw, which directly changes the " ut-out" point
c
ONLY by turning the knob counter clockwise to
OVER RANGE SCREW
decease, or clockwise to increase the differential
on the scale plate.
Assemble to this position when control knob is to be used
to change both the " ut-out"and " ut-in"settings together.
c
c
TEMINALS: Front Access screw type terminals
are on General Application " 10" pressure This adjustment does NOT change the differential of the
0
controls, as illustrated.
control.
4-1002
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