DCS RF151, Руководство по обслуживанию

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3.2 evaporator
The evaporator uses evaporating refrigerant to remove heat from the water that flows over the evaporator plate to form an ice
slab. The ice slab will simply slide down the evaporator plate onto the cutter-grid during harvest.
The evaporator plate will over time have a build-up of mineral deposits. The evaporator will NOT need to be replaced due to the
mineral deposits. However, these deposits must be removed periodically for proper Ice Maker performance.
The evaporator must also be free of nicks and scratches. A nice polished and smooth evaporator will allow the Ice Maker to per-
form correctly, giving the best performance by allowing the ice slab to slide freely and allowing the water to have proper evapora-
tor to water contact. If nicks and scratches are found, replacement is not needed. Simply remove the nicks and scratches with fine
sanding material and then use a polish for stainless steel.
If the evaporator has a leak, it should be replaced. A leak detection device will confirm a leaking evaporator assembly. REMEM-
BER, IF A LEAK IN THE EVAPORATOR, ACCUMULATOR, OR LOW SIDE TUBING IS FOUND, THE COMPRESSOR, DRIER, AND HOT GAS
VALVE WILL NEED TO BE REPLACED.
The temperature control thermistor sets on the bottom of the evaporator plate on a copper bracket. This bracket should be
checked at the solder joint. Any cracks will break the proper thermal conductivity between the evaporator plate and the therm-
istor and result in a long production cycle with a thick slab on the plate. The thermistor should be tightly secured and have full
contact to the copper bracket or thermal conductivity again will be sacrificed.
Removing the Evaporator:
Disconnect power, water line, and drain line. If a drain pump is used, it will need to be disconnected and removed. 1.
Remove the door from the front of the unit. 2.
Remove the escutcheon panel. 3.
Remove the cutter-grid (see Section 6.1, Cutter-Grid). 4.
Remove the ice deflector. 5.
Remove the reservoir (see Section 6.2, Reservoir). 6.
Remove the circulation pump (see Section 6.3, Circulation Pump), hose, and distributor. 7.
Remove the evaporator thermistor fastened on the bottom of the evaporator with a stainless hex head or Phillips screw. 8.
Remove the four screws securing the evaporator plate. 9.
Remove the back panel and lower shroud (see Figure 3.3). 10.
Remove the bin sensing tube with the bin thermistor remaining inside it. It is not necessary to remove the bin thermistor 11.
from the sleeve. Remove through the opening in the back of the liner.
Remove the putty and the water line from the opening in the back of the liner. 12.
Remove the grill by removing the two or four screws (depending on grill style) and disconnecting the three wires to the 13.
rocker switch.
Remove the drain valve. 14.
Remove the water valve. 15.
Take out the two screws that secure the top of the electrical bracket located in the front of the mechanical area (see 16.
Figure 3.5).
Remove the six screws that secure the baseplate to the cabinet on the bottom of the unit (see Figure 3.5). 17.
Gently slide the mechanical out the back of the unit just enough to gain access to the assembly (see Figure 3.6). 18.
Install the access valve and recover refrigerant. After recovering, be sure to cap off the access valve to prevent contamination 19.
of the system.
Remove the cap from the back of the compressor. 20.
Disconnect the starter relay and overload behind the compressor electrical cap by pulling off the starter and then the over- 21.
load. You will not need to disconnect the wires.
Unbraze and remove the capillary tube from the drier assembly. 22.
Unbraze the hot gas valve tube at the evaporator bypass tube (see Figure 3.2). 23.
Unbraze and remove the drier assembly at the condenser (see Figure 3.1). 24.
Unbraze and remove the suction line at the compressor (see Figure 3.8). 25.
SEALEd SySTEM COMpONENTS