Hoshizaki AMERICA 73183 - Manual (Page 18)

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2a. Freezer-Control Module with Remote Display Module
7) Startup/Cool Down–MH and PH energize. There is a slight delay, then Comp, ConFM,
and EvapFM energize. Cabinet temperature appears on DM. 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 and DM Diagnosis: Cabinet temperature appears on DM. If not, check for
115VAC at CM L3 (BK) to CM N5 neutral (W). If 115VAC is not present, check power
switch, power cord connections, and breaker/fuse. Confirm wiring connections are
secure for both CM L3 (BK) (power supply) and CM N5 (W) (neutral). If 115VAC is
present and DM is off, confirm display cable connection is secure. If DM is still off,
replace CM and DM with HS kit.
c) EvapFM Diagnosis: Confirm EvapFM energizes. If not, confirm doors are closed and
DS engaged. Next, check for 115VAC at DSR #8 (LBU) to #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 F6 (BK) to neutral (W). If 115VAC
is not present, replace CM and DM with new HS kit. 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 (BK) to neutral (W). If 115VAC is present at DSR #6 (BK) 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 and DM with HS kit. 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.