22
6. Install the bulb on the suction line exiting the
evaporator (Figure 37). The T.X.V. bulb should always
be mounted on the top of the horizontal line. Good
contact between the bulb and suction line is
necessary for proper operation of the valve. The bulb
must also be well insulated.
7. Replace filter drier using the appropriate brazing
material (Figure 38).
Figure 37. Bulb Installation
Figure 38. Filter Dryer
4.9
HOPPER
A parallel refrigeration circuit feeds the hoppers. A
capillary tube is used to meter the refrigerant to each
hopper. An E.P.R. (Evaporator Pressure Regulating)
valve is used to control the refrigerant flow at the outlets.
The E.P.R. valve controls the hopper pressure so during
heavy dispensing periods, hopper temperatures will not
drop and freeze the mix in the hopper. The adjustable
E.P.R. valve is preset at the factory. If the hopper
temperature is too cold or too warm, an E.P.R. valve
adjustment may be necessary.
4.10
E.P.R. VALVE ADJUSTMENT
To adjust the E.P.R. valve, refer to the following
procedures:
1. Remove the Phillips head screws from the bottom of
the front panel and remove the panel by sliding down
and out.
2. Remove the cap from the E.P.R. Schrader access
fitting (Figure 39).
3. Install a 0-100 P.S.I.G. gauge onto the E.P.R.
Schrader access fitting.
4. Start the refrigeration cycle and read the pressure.
Figure 39. E.P.R. Schrader Access Fitting
8. Once the T.X.V. and filter drier are installed, the
refrigeration system must be leaked checked, purged
and evacuated to 500 microns of mercury or less at
either barrel outlet access fitting proceeding suction
line solenoid valves.
Summary of Contents for E131G
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