Hoshizaki 73168 service manual

3)Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends on pump capacity.

4)Close both gauge manifold valves.

5)Turn off the vacuum pump. Disconnect the vacuum pump hose and attach it to a refrigerant service cylinder. Remember to loosen the connection, and purge the air from the hose. See the nameplate for the required refrigerant charge. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard No. 700 (latest edition) be used.

6)A liquid charge is recommended for charging an R-404A system. Invert the service cylinder and place it on scales.

7)Open the high-side gauge manifold valve and allow the system to charge with liquid until the proper charge is met.

8)If necessary, add any remaining charge to the system through the compressor access valve. Use a throttling valve or liquid dispensing device to add the remaining liquid charge through the compressor access valve with the unit running.

9)Back out the receiver service valve stem all the way and tighten. Disconnect the gauge manifold hoses.

Note: Be sure the receiver service valve stem is backseated all the way out and tight before disconnecting the gauge manifold hose.

10)Cap the valves to prevent possible leaks.

Power Cord

Rail Liquid Line Valve

Receiver Service Valve

Upper Attachment Nut

and Washer

Power Switch

Rail Cooling Switch

Lower Attachment Nut

and Washer

Wire Cover

Compressor		Condenser
Receiver Tank	Drier	Hex Head Bolt

Rail Expansion Valve	Cabinet Liquid Line Valve
Rail Low-Side	Cabinet Expansion Valve
Access Valve
Rail High-Side	Rail Low-Side Service Valve
Access Valve	Rail Service Valve Bracket
Compressor
	Rail High-Side Service Valve
Access Valve
Rail Refrigerant Tubes

Fig. 1

41