Howe Rapid Freeze, Service Manual

Page: 67 / 78

15 Service & Adjustment
SELECTIVE PURPOSE Manual Page (61)
REPLACEMENT OF ELECTRIC EYES (ICE LEVEL CONTROL)
1. Turn off the main power and remove the 11-pin power module.
2. Locate the sensor to be replaced, and remove the sensor housing cover (if present).
3. Using two open-ended wrenches, and placing one on the back nut and one on the forward nut, remove the sensor.
4. Disconnect the sensor from the terminal strip (under the relay base).
5. Connect the replacement sensor to the terminal strip. (Connect black wire from receiver only to terminal marked “Black”).
6. Install the sensor in the mounting bracket, and tighten the locknuts.
7. Re-install the power module into the base.
8. Turn on main power.
9. Check alignment of the sensors. When proper alignment is achieved, the LED on the receiver will light. Adjust the
mounting brackets as necessary to ensure that the sensors are properly aligned.
10. Reinstall the sensor housing covers (if applicalble).
REPLACEMENT OF WATER PUMP
Turn off the main power to the flaker, Remove screws holding the stationary sump cover, loosen and
remove water tube fitting (Nylon compression fitting), remove the cover from the electrical junction
box, disconnect the water pump wires from the terminal strip. Lift the water pump (with cover
attached) off the sump. Remove the water tube hose and clamp. Loosen and remove four (4) nuts
which hold the pump onto the sump cover; the pump can then be removed from the cover.
Installing the new pump, simply reverse the above procedure. Use caution when routing the new cables
to insure they are secured to avoid accidental damage.
REPLACEMENT & ADJUSTMENT OF WATER FLOAT VALVE
Turn off main power to ice flaker.
Shut off the water supply to the ice flaker and drain the supply line. Loosen and remove the
compression fitting at the float valve. While holding the float valve body with a pliers or crescent
wrench, remove the water float valve fitting from the valve body. Using a 13/16" socket (a spark plug
wrench works well), remove the locking nut from the valve body, (you may need to hold the valve body
to keep it from turning). Remove the old valve and fibre washer. Install new valve (with fibre washer
on the inside of the water sump), tighten the locking nut with the socket. The valve body should be held
in place with the discharge port facing straight down. Re-install the float valve fitting. Reattach water
supply line. Turn on water shut off valve and check for leaks at the compression fitting and at the float
valve fitting. The water level should be maintained just below the lower edge of the water return trough
while the flaker is operating. To adjust the operating level, hold the float in one hand, and push or pull
on the brass shaft (depending on whether the water level is too high or too low.) Watch the operation
for a while to verify the water level. If the water level is still not where it should be, re-adjust the float.
REPLACEMENT OF EXPANSION VALVE
Pump down the ice flaker and evacuate refrigerant from the liquid line. Carefully cut back the insulation
on the suction line and remove the remote bulb. The bulb is secured to the suction line with two straps.
Loosen and remove flare nuts on the expansion valve and remove the old valve. Install the new valve and