Refrigeration System | Section 7 |
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Self-Contained Charging Procedures
Important
The charge is critical on all Manitowoc ice machines. Use a scale or a charging cylinder to ensure the proper charge is installed.
1. Be sure the toggle switch is in the OFF position.
MANIFOLD SET
CLOSEDOPEN
LOW SIDE | FRONTSEATED | BACKSEATED | HIGH SIDE |
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SERVICE |
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| SERVICE |
VALVE |
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CHARGING
CYLINDERVACUUM PUMP/
RECOVERY UNIT
CLOSED
OPEN
SV1404B
Figure 7-9. Charging Connections
2.Close the vacuum pump valve, the low side service valve, and the low side manifold gauge valve.
3.Open the high side manifold gauge valve, and backseat the high side service valve.
4.Open the charging cylinder and add the proper refrigerant charge (shown on nameplate) through the discharge service valve.
5.Let the system “settle” for 2 to 3 minutes.
6.Place the toggle switch in the ICE position.
7.Close the high side on the manifold gauge set. Add any remaining vapor charge through the suction service valve (if necessary).
NOTE: Manifold gauges must be removed properly to ensure that no refrigerant contamination or loss occurs.
8.Make sure that all of the vapor in the charging hoses is drawn into the ice machine before disconnecting the charging hoses.
A.Run the ice machine in freeze cycle.
B.Close the high side service valve at the ice machine.
C.Open the low side service valve at the ice machine.
D.Open the high and low side valves on the manifold gauge set. Any refrigerant in the lines will be pulled into the low side of the system.
E.Allow the pressures to equalize while the ice machine is in the freeze cycle.
F.Close the low side service valve at the ice machine.
G.Remove the hoses from the ice machine and install the caps.
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