Hoshizaki AMERICA 73183 - Manual (Page 22)

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2b. Freezer-Control Module with Integrated Display
7) Startup/Cool Down– MH and PH energize. There is a slight delay, then Comp, ConFM,
and EvapFM energize. Cabinet temperature appears on display. Once DTh cools to
32
°F (0°C), 4-hr. Comp cumulative run timer starts.
a) MH and PH Diagnosis: Confirm MH and PH energize. Check for 115VAC at MH and
PH. If 115VAC is not present, confirm power supply and continuity of power switch.
If 115VAC is present, check amp draw of MH and PH. If an amp reading is not
present, check continuity of MH or PH. If open, replace MH or PH.
b) CM Diagnosis: Cabinet temperature appears on display. If not, check for 115VAC
at CM L2 (BK) to CM N3 neutral (W). If 115VAC is not present, confirm wiring
connections are secure on CM L2 (BK) (power supply) and CM N3 (W) (neutral).
If 115VAC is present and display is off, replace CM.
c) EvapFM Diagnosis: Confirm EvapFM energizes. If not, confirm doors are closed
and DS engaged. Next, check for 115VAC at DSR #8 (LBU) to DSR #7 neutral (W).
If 115VAC is not present, check DS continuity. If DS is engaged and contacts are
open, replace DS. If 115VAC is present, check for 115VAC at CM F5 (Y) to neutral
(W). If 115VAC is not present, replace CM. If 115VAC is present, check for 115VAC
at DSR #4 (DBU) to neutral (W). If 115VAC is not present, check for 115VAC at DSR
#6 (Y) to neutral (W). If 115VAC is present at DSR #6 (Y) to neutral (W) and not at
DSR #4 (DBU) to neutral (W), replace DSR. If 115VAC is present at DSR #4 (DBU)
to neutral (W), check EvapFM blades for binding and EvapFM continuity.
d) Comp and ConFM Diagnosis: Confirm Comp and ConFM energize. If not, check for
115VAC at CM C1 (R) to neutral (W). If 115VAC is not present, check CTh status.
See "II.D.Thermistor Check." If CTh ohm reading is in proper range, replace CM. If
115VAC is present at CM C1 (R) to neutral (W), check continuity of HPS. If open,
allow time for HPS to reset. If HPS does not reset, see "e) HPS Activation" below.
If HPS is closed, check for 115VAC at CR #5 (GY) to CR #6 neutral (W). If 115VAC
is present, check for 115VAC at CR #1 (R) to neutral (W). If 115VAC is not present,
replace CR. If 115VAC is present and ConFM is energized but Comp is not,
check for 115VAC at Comp protector if external (internal on 1-section, external on
2-section) to neutral (W). If 115VAC is not present, give time for Comp protector to
cool and reset. If Comp protector does not reset, replace Comp protector. If 115VAC
is present, check run capacitor, start capacitor, start relay, and Comp motor
windings. If ConFM is not energized, check ConFM fan blades for binding and motor
winding continuity.
If Comp and ConFM are energized and the cabinet does not cool down, check for a
restriction in the refrigeration circuit, correct TXV operation, and correct refrigerant
charge.
e) HPS Activation: Confirm ConFM is energized and fan blade turns freely. Confirm
condenser coil is not clogged or restricted. Confirm there are no restrictions in the
refrigeration circuit (TXV and drier). Let refrigeration circuit pressures equalize.
If HPS does not reset and pressures are equalized, replace HPS. If pressures are
not equalized, reclaim refrigerant and diagnose refrigeration circuit restriction.