Howe Rapid Freeze, Service Manual

Page: 31 / 78

Start & Adjust
25
7)________ After a few minutes, the ice maker will begin to freeze the water circulating over
the evaporator into ice.
8)________ Allow 10-15 minutes to let the ice flaker come down to temperature and balance
out.
9)________ Looking down into the evaporator, through the hand hole cover, check to make
sure the ice is being frozen and harvested over the entire surface of the evaporator. If it is not,
9a)________ check for bubbles in the sight glass.
9b)________ check the suction pressure @ the ice machine (connect low pressure
gauge to a charging valve mounted on the suction line). Suction temperature must
be maintained @ -5
° F(-20.5 ° C) to -10 ° F (-23.3 ° C) at all times. (For freshwater), -
30 ° F (-34.4 ° C) (For seawater).
10)________ Liquid line must have unrestricted flow at all times for proper performance of ice
flaker. On ice flakers connected to a rack system, liquid line should be connected directly to the
receiver, before any defrost restricting valves.
11)________ If suction temperature is between -5
°
F (-20.5
°
C) to -10
°
F (-23.3
°
C),
(For freshwater), -30 ° F (-34.4 ° C) (For seawater).
and there are no bubbles in the sight glass, and ice is not being frozen and harvested on the
entire surface of the evaporator, then the expansion valve must be adjusted.
(EXHIBIT 29)
12)________ Remove the adjustment stem cover and turn the adjustment stem 1/8 to 1/4 turn at
a time (clockwise to close the valve if it was overfeeding, counterclockwise to open the valve if
the evaporator was not freezing ice on its entire length.) Wait 10-15 minutes between each
adjustment to allow the valve and machine balance out. Repeat this step until ice is produced
and harvested all the way down to the bottom of the evaporator.
13)________ When the ice maker is adjusted and operating properly, turn off the on-off switch,
or block the electric eye beam path. (The electric eye control has a 15 second delay before it's
output opens.). When the output opens, or when the on-off switch is opened the shutdown
sequence (de-energize the solenoid valve, and start the off delay cycle for the drive motor &
water pump.) is initiated.