Internal Condenser Volume; Condenser ∆T; Refrigerant Charge; Quick-Connect Fittings - Manitowoc J250 Service Manual

Section 2

INTERNAL CONDENSER VOLUME

The multi-circuit condenser internal volume must not
be less, nor greater, than that used by Manitowoc.
Do not exceed internal volume and try to add
charge to compensate. Compressor failure will
result.
CONDENSER ∆ ∆ ∆ ∆ T
∆T is the difference in temperature between the
condensing refrigerant and the entering air. The ∆T
should be 15-20°F at the beginning of the freeze
cycle (peak load conditions) and drop to 12-17°F
during the last 75% of the freeze cycle (average load
conditions).
Refrigerant
Model
Type Charge
J450 R404-A 6 lb.
J600 R404-A 8 lb.
J800 R404-A 8 lb.
J1000 R404-A 9.5 lb.
J1300 R404-A 14 lb.
J1800 R404-A 17 lb.
1
Amount reflects additional refrigerant added to nameplate charge to ensure proper operation at all ambient conditions.
J1300 has an additional 1.5 lb., J1800 has an additional 2.0 lb.
CAUTION
Internal
Heat of Condenser
Rejection Volume
(cu. ft.)
Avg. Peak
Min. Max.
BTU/Hr BTU/Hr
7,000 9,600 0.020 0.035
9,000 13,900 0.045 0.060
12,400 19,500 0.045 0.060 pressure,
16,000 24,700 0.065 0.085 2500 psig
24,000 35,500 0.085 0.105
1
36,000 50,000 0.130 0.170
1
Installation References

REFRIGERANT CHARGE

Remote ice machines have the serial plate refrigerant
charge (total system charge) located in the ice maker
section. Remote condensers and line sets are supplied
with only a vapor charge.
Never add more than nameplate charge to ice
machine for any reason.

QUICK-CONNECT FITTINGS

The ice machine and the line sets come with quick-
connect fittings. It is recommended that matching
quick-connects (available from Manitowoc
distributors) be installed in the multi-circuit
condenser, and a vapor "holding" charge (5 oz.) of
refrigerant be added.
Quick-Connect
Design Stubs-Male Ends
Pressure
Discharge
500 psig coupling
safe P/N 83-6035-3 P/N 83-6034-3 P/N 83-6809-3
working
mounting
flange
burst P/N 83-6006-3 P/N 83-6005-3
pressure
CAUTION
Head Pressure
Control
Valve
Liquid
coupling Manitowoc
mounting NO SUBSTITUTES
flange
2-17