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3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends
on pump capacity.
4) Close the low-side valve and high-side valve on the gauge manifold.
5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a
refrigerant service cylinder. Remember to loosen the connection and purge the air
from the hose. For the required refrigerant charge, see the nameplate. Hoshizaki
recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard
700 (latest edition) be used.
6) A liquid charge is required when charging an R-404A system (to prevent fractionation).
Place the service cylinder on the scales; if the service cylinder is not equipped with
a dip tube, invert the service cylinder, then place it on the scales. Open the high-side
valve on the gauge manifold.
7) Allow the system to charge with liquid until the proper charge weight is met.
8) If necessary, add any remaining charge to the system through the low-side.
NOTICE!
To
prevent compressor damage, use a throttling valve or liquid dispensing device
to add the remaining liquid charge through the low-side refrigerant access valve
with the appliance running.
9) Close the high and low-side gauge manifold valves, then disconnect the gauge manifold
hoses.
10) Cap the access valves to prevent a possible leak.
B. Important Notes for Component Replacement
NOTICE
When replacing a component listed below, see the notes to help ensure proper
operation.
Component
Notes
Compressor
Install a new start capacitor, run capacitor, and start relay.
Thermostatic
Expansion Valve
• Attach the thermostatic expansion valve bulb to the suction line in the same location as
the previous bulb.
• The bulb should be between the 10 and 2 o'clock positions on the tube.
• Secure the bulb with the clamp and holder, then insulate it.
Fan Motor
Install a new capacitor (if applicable).
Thermistor
• Attach the new thermistor in the same location as the previous thermistor.
• Be very careful to prevent damage to the leads.
High-Pressure
Switch
• Control Board adapts to an open or closed high-pressure switch by recognizing and
accepting the high-pressure switch condition at startup.
