Refrigeration System - Follett T400A Installation, 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 specifi cations will void the warranty.
Model
T400A, MCD400A, MFD400A, R400A, D400A (air-cooled)
T400W, MCD400W, MFD400W, R400W , D400W (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.
Ambients
Air temperature 1
Water temperature 2
1 Ambient air temperature is measured at the air-cooled condenser coil inlet.
2 Ambient water temperature is measured in the ice machine fl oat reservoir.
Ice capacity test
Ice machine production capacity can only be determined by weighing ice produced in a specifi c time period.
1. Replace all panels on ice machine.
2. Run ice machine for at least 15 minutes.
3. Weigh and record weight of container used to catch ice.
4. Catch ice for 15 or 20 minutes.
5. Weigh harvested ice and record total weight.
6. Subtract weight of container from total weight.
7. Convert fractions of pounds to decimal equivalents (ex. 6 lbs 8oz = 6.5 lbs).
8. Calculate production using following formula:
1440 min. x wt. of ice produced
Total test time in minutes
9. Calculated amount per 24 hours should be checked against rated capacity for same ambient and water
temperatures in Ice Production Tables.
R404A ice machine charge specifi cations
Minimum Maximum
50 F/10 C 100 F/37.8 C
40 F/4.4 C 90 F/32.2 C
=
28
Charge
19oz (539g) R404A
9oz (255g) R404A
Production capacity/24 hr. period
Refrigerant type