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2. Prep Table
1) Unplug the appliance from the electrical outlet.
2) Remove the rear panel.
3) Plug the appliance back into the electrical outlet.
4)
Startup/Cool Down–
Temperature above setpoint. CTh closed. Comp, ConFM, and
EvapFM energize.
Diagnosis:
Check that Comp, ConFM, and EvapFM energize.
If not, confirm that the appliance is not in a defrost cycle. DT is operating properly,
temperature is above setpoint, and CTh is closed. Check voltage on DT. In cooling,
115VAC is present on both DT terminal #1 (BK) and DT terminal #4 (BK) or (BR) to a
neutral (W). If 115VAC is present on terminal #2 (R) to a neutral (W), advance DT out
of defrost cycle or replace DT. Check both terminals of CTh (BK) or (BR) to a neutral
(W) for 115VAC. If 115VAC is present on one terminal and not the other, replace CTh.
If 115VAC is present on both terminals, check for voltage at Comp, external protector,
and Comp terminals. Check Comp winding continuity. Check voltage on ConFM and
EvapFM. Check ConFM and EvapFM winding continuity and fan blades for binding.
Note: CRMR60-xx and CRMR72-xx, also see "HPS Activation (CRMR60 and CRMR72
Prep Table)" below.
If Comp, ConFM, and EvapFM are energized and the cabinet temperature does not
cool down, check for a restriction in the refrigeration circuit, low refrigerant charge, or
inefficient Comp.
HPS Activation (CRMR60 and CRMR72 Prep Table):
Check continuity of HPS.
If open, allow time for system pressure to equalize and HPS to reset. If HPS does
not reset, replace HPS and diagnose reason for HPS activation. Confirm ConFM is
energized and fan blade turns freely. Check that the condenser coil is not clogged or
restricted. Check that there are no restrictions in the refrigeration circuit (drier).
Confirm that the appliance location meets factory requirements:
• This appliance is not intended for outdoor use. Normal operating ambient temperature
should be within 45°F to 100°F (7°C to 38°C).
• The appliance should not be located next to ovens, grills, or other high heat producing
equipment.
6)
Cool Down Achieved
–Temperature cools to setpoint. CTh opens. EvapFM continues.
Comp and ConFM de-energize.
Diagnosis:
If cabinet temperature has cooled to
setpoint and Comp and ConFM do not de-energize, check CTh continuity. If CTh
defective, replace CTh.
7)
Defrost–
Defrost Initiation:
DT terminates. EvapFM continues (auxiliary code C-5 and
earlier). If CTh closed, Comp and ConFM de-energize. EvapFM de-energizes (auxiliary
code C-6 and later) and DH energizes (CRMR48-xx aux. code C-7 and later. All others
aux. code D-8 and later).
Defrost Termination:
DT terminates. EvapFM continues (auxiliary code C-5 and earlier).
If CTh closed, Comp and ConFM energize. EvapFM energizes (auxiliary code C-6
and later) and DH de-energizes (CRMR48-xx aux. code C-7 and later. All others aux.
code D-8 and later).
