[G] Condenser Cooling Fan Motor - Hoshizaki FM-251AFE Service Manual

b) Water-cooled Condenser (Tube-in-tube type)
Cooling water flows in the inner tube and refrigerant gas flows in the outer tube in opposite
directions (counterflow) for efficient heat exchange. The valve position of the Water
Regulator is automatically controlled to regulate the discharge pressure in the refrigerant
circuit and change the flow rate of cooling water.
Scale, slime and corrosion will affect heat exchange. Scale such as silica and iron oxide is
the most common cause of problems and must be removed if any. Dissolve a scale
remover in cold or warm water, and chemically remove scale inside the Condenser by
either of the following procedures:
< Procedure 1 >
Leave the above cleaning solution inside the Condenser for 12 hours.
< Procedure 2 >
1) Prepare the following:
Pump Motor-----------------May be used for another icemaker.
Dissolving Tank ------------Holds at least 10L plastic bucket.
Connecting Hose ----------Vinyl hose ø9 x ø15 x 1.5m (x 2)
Cold or warm water -------10L (50°C water is most effective)
Scale Remover-------------Appropriate amount
Note: The cleaning procedure may vary depending on the remover used. Follow the
instructions of the manufacturer.
Others ------------------------W16 Flare Nut (x 2), Wire, Connecting Pipe (with one flared
end, x 2)
2) Remove the cabinet, and check the Condenser joint for corrosion or water leak.
3) Disconnect the flare nuts at the Condenser inlet and outlet
4) To prepare a circulation circuit, connect the Condenser outlet (top) with the hose to the
Tank and the Condenser inlet (bottom) with the hose from the Pump Motor.
5) Operate the Pump Motor to clean the Condenser.
6) Circulate the solution for 0.5 - 2 hours, depending on the amount of scale. The solution
may turn reddish black in 30 minutes with dissolved scale. It will not reattach during
circulation. Also, the solution may bubble in the Dissolving Tank by chemical reaction,
which will not affect cleaning.
7) After cleaning, rinse the circuit until the water becomes clear.
8) After rinsing, reconnect the Condenser, and restart the icemaker.
9) The cleaning effect should be checked by the amount of scale dissolved during the
circulation cleaning or by comparison of suction and discharge pressures and cooling
water amount between before and after the cleaning.

[g] CONDENSER COOLING FAN MOTOR

The Fan Motor cools the Air-cooled Condenser and sends air to condense refrigerant gas
inside the Condenser.
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