Hoshizaki AMERICA 73183 - Manual (Page 16)

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1b. Refrigerator-Control Module with Integrated Display
7) Startup/Cool Down–There is a slight delay, cabinet temperature appears on display.
Comp, ConFM, EvapFM, and MH energize.
a) 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 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.
b) MH Diagnosis: Confirm MH energizes. Check for 115VAC at MH. If 115VAC is not
present, confirm power supply and continuity of power switch. If 115VAC is present,
check amp draw of MH. If an amp reading is not present, check the continuity of
MH. If open, replace MH.
c) 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, check power switch,
power cord connections, and breaker/fuse. Confirm wiring connections are secure
for both CM L2 (BK) (power supply) and CM N3 (W) (neutral). If 115VAC is present
and display is off, replace CM.
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 at CM C1 (R) to
neutral (W), 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 #14 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 Comp
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.