Hoshizaki REFRIGERATED PREP TABLE WITH RAISED RAIL 73168 Service Manual page 41

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
Compressor
Rail Expansion Valve
Rail Low-Side
Access Valve
Rail High-Side
Access Valve
Compressor
Access Valve
Rail Refrigerant Tubes
Receiver Tank
Fig. 1
Condenser
Drier
Hex Head Bolt
Cabinet Liquid Line Valve
Cabinet Expansion Valve
Rail High-Side Service Valve
41
Upper Attachment Nut
and Washer
Power Switch
Rail Cooling Switch
Lower Attachment Nut
and Washer
Wire Cover
Rail Low-Side Service Valve
Rail Service Valve Bracket