Refrigeration System (All Models) - Follett MCD425A/W Operation And Service Manual

Refrigeration system (all models)

All service on refrigeration systems must be performed in accordance with all federal, state and local laws . It is the
responsibility of the technician to ensure that these requirements are met . Recharging ice machine to other than
factory specifications will void the warranty .
Model
MCD425A, MFD425A, R425A, P425A (air-cooled)
MCD425W, MFD425W, R425W, P425W (water-cooled)
Refrigerant replacement requirements
1. Non-contaminated refrigerant removed from any Follett refrigeration system can be recycled and returned
to the same system after completing repairs . Recycled refrigerant must be stored in a clean, approved
storage container . If additional refrigerant is required, virgin or reclaimed refrigerant that meets ARI
standard 700-88 must be used .
2. In the event of system contamination (for example, a compressor burn out, refrigerant leak, presence of
non-condensibles or moisture), the system must be repaired, evacuated and recharged using virgin or
reclaimed refrigerant that meets ARI standard 700-88 .
3. Follett Corporation does not approve of recovered refrigerants . Improper refrigeration servicing
procedures will void the factory warranty .
Evacuation
Evacuate the system to a level of 500 microns . When the 500 micron level is reached, close valves and both
manifold and shut down the vacuum pump . Allow the system to sit for approximately 20 minutes . During this period
the system pressure should not rise . If the system pressure rises and stabilizes there is moisture in the system and
further evacuation is needed . If the pressure continues to rise check the system for leaks .
Ice capacity test
Ice machine production capacity can only be determined by weighing ice produced in a specific time period .
Replace all panels on ice machine .
1. Run ice machine for at least 15 minutes .
2. Weigh and record weight of container used to catch ice .
3. Catch ice for 15 or 20 minutes .
4. Weigh harvested ice and record total weight .
5. Subtract weight of container from total weight .
6. Convert fractions of pounds to decimal equivalents (ex . 6 lb 8 oz . = 6 .5 lb) .
7. Calculate production using following formula:
1440 min . x wt . of ice produced
Total test time in minutes
8. Calculated amount per 24 hours should be checked against rated capacity for same ambient and water
temperatures in Ice Production Tables .
24 MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines
R404A ice machine charge specifications
= Production capacity/24 hr . period
Charge Refrigerant type
15 oz . (425 g) R404A
9 oz . (255 g) R404A