Concept Of Exchange; Removal Of Defective Compressor; Measurement Of Oil Amount In The Defective Compressor - Toshiba Super MMU-AP0091H Service Manual

15-2. Replacing Compressor

Concept of exchange

When exchanging the compressor, extract oil from the defective compressor and decide to exchange the
defective compressor or two compressors based upon the limit sample.
(If oil color ASTM is 4.0 or more, both compressors should be replaced.)
A compressor weighs 20kg or more. The two personnel
should work for a compressor.
<Removal of defective compressor>
• Turn off power of the troubled outdoor unit.
• Take off the front panel. (M5 × 7)
• Take off cover of the electric parts box. (M4 × 2)
• Take off the screws (M5 × 2) fixing the electric parts box to
the outdoor unit.
• Take off claw for temporary hooking from the lower part of the
electric parts box.
(NOTE) Pay attention that the electric parts box may fall out
due to the center of gravity.
• Take off the hooks from the upper part of the electric parts
box and move it to the valve side.
(NOTE) If installed status of the moved electric parts box is
unstable, it may fall down. When the electric parts
box is unstable, take off all the cables inside of the
electric parts box, and then remove the entire
electric parts box completely.
• Remove the lower duct. (M4 × 4)
• Take off the sound-insulation mat.
• Remove the crank case heater.
• Take off the terminal cover of the compressor, the wiring to
the compressor, and the case thermostat unit.
(NOTE) Be sure to apply insulate to the removed cable
terminals with insulating tape, etc. To exchange the
compressor, remove cables of the compressor only.
• Remove the discharge pipe, suction pipe, and oil-equation
pipe.
• Take off the hexagonal bolts fixing the compressor.
(One side of hexagon: 13mm × 2 pcs. a compressor)
(NOTE) Only two hexagonal bolts are provided to a com-
pressor, but it is not lack.
• Remove the compressor.
<Measurement of oil amount in the defective compressor>
• Put the troubled compressor on a scale and measure oil amount.
Oil amount of the troubled compressor:
A [cc] = (Removed compressor mass (kg) –23.5) × 1042
(NOTE)
• When the compressor holds no oil, the compressor mass is 23.5kg.
CAUTION
(Specific gravity of oil: 1042 [cc/kg])
Hooks
Be careful that oil in the pipe may emit
fire when broiling the welded point with a
burner.
Compressor/
Sound-insulation mat
243
M5 screws
(2 positions)
Claw for
temporary hooking
WARNING
Positions to be removed
(3 positions)
(In case of right side)
* Left side is same
as right side
Lower duct
M4 screws
(4 positions)