Service Manual

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c) WV and HGVs Diagnosis: If WV is energized, check for 115VAC at CB K1 #6 (O)
to neutral (W). If 115VAC is present after PM energizes in harvest cycle, replace
CB. If 115VAC is not present, replace WV (bypassing). If HGVs (KMS and SRK) did
not de-energize at the end of harvest, check for 115VAC at CB K1 #2 (P) to neutral
(W). If 115VAC is present 50 sec. after PM energizes, replace CB. If 115VAC is not
present, replace HGV(s) (bypassing).
d) PM Diagnosis: Conrm water is owing over evaporator from PM and not WV.
IfPM de-energizes once freeze begins (except for anti-slush), check for 115VAC
at CB K1 #4 (R) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is
present and PM is de-energized, check for 115VAC at control switch #5 (W/R) to
neutral (W). If115VAC is present at CB K1 #4 (R) and not at control switch #5 (W/R),
check control switch continuity between #5 (W/R) and #4 (R). Replace as needed.
If115VAC is present at control switch #5 (W/R) to neutral (W), check PM capacitor
and motor winding continuity.
e) LLVs Diagnosis: If LLVs does not energize, check for 115VAC at CB K1#3 (BK) to
neutral (W). If 115VAC is not present, replace CB. If 115VAC is present, check coil
voltage and continuity.
f) Refrigerant Pressures, HM, and TXV Diagnosis: If evaporator is still not cooling,
check refrigerant pressures. See "VIII.A. Specication and Performance Data
Sheets." Next, check HM operation. If refrigeration pressures are above HM setpoint
and HMis bypassing, replace HM. Check TXV for proper operation. Remove TXV
bulb and hold it in your hand, refrigerant low-side pressure should rise, place
TXV bulb in ice water, refrigerant low-side pressure should drop. A 10 to 15 pound
pressure swing between warm and cold conditions indicate a good TXV. If a 10 to 15
pound swing is not present, replace TXV.
g) Freeze Termination Diagnosis: After 5 min. in freeze, disconnect CB K5 FS
connector. 15 sec. later appliance should switch out of the freeze cycle (15 second
delay after FS opens before terminating the freeze cycle). If appliance remains in
freeze longer than 15 sec. after FS removed, replace CB. If appliance switches with
FS removed but would previously not switch out of freeze with FS connected (long
freeze - 3 beep alarm), see "II.F. Float Switch Check and Cleaning."
Note: Normal freeze cycle will last 20 to 40 min. depending on model and conditions.
Cycle times and pressures should follow performance data provided in this manual.
See "VIII.A. Specication and Performance Data Sheets."
h) Short Freeze Cycle Diagnosis: Conrm water tank lls and overows during 1 min.
ll and harvest cycles. If not, check water supply lters, shut-off valve, WV screen.
Ifwater tank empties before 5 min. timer terminates and freeze cycle is short, check
that DV is not leaking by or energized (water owing through DV). If DV is leaking by,
remove and clean DV, replace as needed. If water tank is full, see "II.F. Float Switch
Check and Cleaning." for erratic operating FS.