Service manual
Table Of Contents
- Important Safety Information
- I. Construction and Refrigeration Circuit Diagram
- II. Sequence of Operation and Service Diagnosis
- III. Controls and Adjustments
- IV. Refrigeration Circuit and Component Service Information
- V. Maintenance
- VI. Preparing the Appliance for Periods of Non-Use
- VII. Disposal
- VIII. Technical Information
13
CRES Factory Default Temperature Settings:
a) Setpoint: 35°F (2°C).
b) Display Scale: °F.
For further details, see "III. Controls and Adjustments."
Note:
There is a minimum 2-min. Comp on time and 2-min. Comp off time.
1) Unplug the appliance from the electrical outlet.
2) Remove the front panel.
3) Plug the appliance back into the electrical outlet.
4) Conrm 115VAC at CM L2 (BK or BR) to neutral (W).
5) Startup/Cool Down–There is a slight delay, cabinet temperature appears on display
and Comp and EvapFM icons turn on. Comp, ConFM, and EvapFM energize.
a) CM Diagnosis: Cabinet temperature appears on display. If not, check for 115VACat
CM L2 (BK or BR) to CM N3 neutral (W). If 115VAC is not present, check power
cord connections and breaker/fuse. Conrm wiring connections are secure for both
CML2 (BK or BR) (power supply) and CMN3(W) (neutral). If 115VAC is present
and display is off, replace CM.
b) Comp/ConFM Diagnosis: Conrm Comp and ConFM energize. Ifnot, check
for 115VAC at CM C1 (BR or BK) to neutral(W). If 115VAC is not present at
CMC1(BRor BK) to neutral (W), check CTh status. See "II.C. Thermistor Check."
If CTh ohm reading is in proper range, replace CM. If 115VAC is present at CM C1
(BR or BK) to neutral(W), check continuity of HPS (if applicable). If open, allow time
for HPS to reset. If HPS does not reset, see "d) HPS Activation" below. If ConFM
is energized but Comp is not, check for 115VAC from both sides of Comp external
protector to neutral (W). If 115VAC is present on one side and not the other, allow
time for Comp external protector to cool and reset. If Comp external protector does
not reset, replace Comp external protector. If115VAC is present on both Comp
external protector wires, 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 and correct refrigerant charge.
c) EvapFMDiagnosis:
1. CPT: Conrm EvapFM energizes. If not, check for 115VAC at CMF5(DBU) to
neutral (W). If 115VAC is not present, replace CM. If 115VAC is present, check
EvapFM blades for binding and EvapFM continuity.
2. CRES: Conrm EvapFM energizes when Comp energizes. If not, check for 115VAC
at CM C1 (BR) to neutral(W). If 115VAC is not present, replace CM.
If115VAC is present, check for a loose wire, EvapFM blades binding, and
EvapFM continuity.
d) HPS Activation: Conrm ConFM is energized and fan blade turns freely.
Conrmcondenser coil is not clogged or restricted. Conrm there are no restrictions
in the refrigeration circuit (drier). Let refrigeration circuit pressures equalize. IfHPS
does not reset and pressures are equalized, replace HPS. Ifpressures are not
equalized, reclaim refrigerant and diagnose refrigeration circuit restriction.