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8) Freeze Cycle – "GM" and "COMP" LEDs are on."GM"LED,GMR(X2onCB),
GM,GMPR,andEHcontinue."COMP"LEDturnsonandPDSenergizes.Oncethe
refrigeration circuit low-side pressure rises to 29 PSIG, CLPS closes, energizing MC,
which energizes Comp and FMR. Iceproduction begins 4 to 6 minutes after Comp and
FMR energize depending on ambient and water conditions.
FS Diagnosis:Checkthat"COMP"LEDisonandthatPDSenergizes.If"COMP"LED
is off, check DC voltage across GMPR terminals 3 and 5 white/orange (W/O) wires.
If 5VDC is present, GMPR contacts are open. Check GMPR solenoid voltage and
solenoidcontinuity.ReplaceGMPRifnecessary.If"COMP"LEDremainsoff,CBisbad
andmustbereplaced.If"COMP"LEDisonandPDSisnotenergized,conrm115VAC
at CB X1 relay brown (BR) to white (W) neutral and CB X1 relay dark blue (DBU) to
white (W) neutral. If 115VAC is present on CB X1 brown (BR) and not on CB X1 dark
blue (DBU) CB is bad and must be replaced. Next, check for 115VAC from PDS dark
blue (DBU) to white (W) neutral. If 115VAC is present and PDS is closed, check for
continuity through PDS solenoid. If open or if PDS is sticking closed, replace PDS.
SRCDiagnosis: Conrm that CLPS closes. Once CLPS closes, MC energizes,
energizing Comp and FMR. If not, check CLPS, SLPS (manual reset), and HPS
(automatic reset).
CLPS: When PDS is energized, CLPS closes when refrigeration circuit low-side
pressure rises to 29 PSIG. If CLPS is open, check that refrigeration circuit low-side
pressure has reached 29 PSIG. If refrigeration circuit low-side pressure is too low,
conrm proper TXVoperation, check for refrigerant restrictions (drier, PDS), and correct
refrigerant charge. Recover, evacuate, and recharge if necessary.
SLPS: If SLPS is open, manually reset SLPS. Conrm proper TXV operation, check for
refrigerant restriction (drier, PDS), and correct refrigerant charge. Recover, evacuate,
and recharge if necessary.
HPS: HPS automatically resets when refrigeration circuit high-side pressure is within an
acceptable range. If HPS does not reset (open), allow pressures to equalize and HPS
to reset. If refrigeration circuit high-side pressure does not drop, recover, evacuate, and
recharge if necessary. Before restarting unit, check for dirty or clogged condenser. Once
unit is restarted, check for proper FMR operation and fan blade for binding. Check for
refrigeration circuit refrigerant restriction (receiver, service valves, PDS, and drier). Also
check for proper HM operation. If refrigerant pressures have returned to an acceptable
range and HPS does not close, replace HPS.
MC: If MC energizes and Comp does not energize, check 208-230VAC at MC T1 black
(BK) to MC T2 red (R). If 208-230VAC is not present, check incoming power supply and
MC contact continuity. If 208-230VAC is present and Comp does not start, check Comp
start relay, start capacitor, run capacitor, and Comp motor windings. If FMR does not
energize, check 115VAC at MC T3 dark blue (DBU) to white (W) neutral. If 115VAC is
present and FM does not energize, check FM capacitor and motor windings.