Hoshizaki FD-1001MWH(-C) User Manual

9

b) Connection to a Closed Loop System
• Condenser water supply inlet is 1/" female pipe thread (FPT). A minimum of 3/8" OD 

copper tubing is recommended for the condenser water supply line.

• Condenser return outlet is 3/8" FPT. A minimum of 3/8" OD hard pipe is recommended for 

the condenser return line.

• Shut-off valves and drain valves should be installed at both the condenser water supply 

inlet and condenser return outlet.

• The water supply to the condenser should not drop below 4 GPM. 
• The pressure differential between the condenser water supply inlet and condenser return 

outlet must be no less than 10 PSIG.

• When using a glycol blend, the solution mixture should be less than 30% glycol.
• In order to maintain the proper high side pressure, the condenser water supply inlet 

temperature should not drop below 45°F (7°C) and the condenser return outlet 
temperature must be in the 104°F to 115°F (40°C to 46°C) range. Once the icemaker 
installation is complete, confirm the condenser return outlet temperature 5 minutes 
after a freeze cycle starts. If the outlet temperature is not in the proper range, adjust the 
water-regulating valve to bring it into range.

Separate piping to approved drain. 

Leave a -inch (5-cm) vertical air gap 

between the end of each pipe and the 

drain.

-inch 

(5-cm) air 

gap

Floor

Drain

Condenser Water 

Supply Inlet

1/" FPT

Condenser 

Return Outlet 

3/8" FPT

Icemaker Water 

Supply Line 

Drain Valve

Icemaker

Icemaker Water 

Supply Inlet

1/" FPT

Bin Drain Outlet 

3/4" FPT

Icemaker 

Drain Outlet 

3/4" FPT

To convert to top water supply, 

install the optional Top Water 

Supply Kit (HS-13).

Storage Bin

Condenser Shut-Off Valves

Condenser Drain Valves

Icemaker Water 

Supply Line 

Shut-Off Valve