27
7)
Startup–EvapFM icon is on and Comp icon is flashing.
EvapFM energizes.
2-min. Comp delay timer starts. Comp icon flashes until 2-min. Comp delay timer
terminates.
Diagnosis:
Check that CT LEDs and EvapFM icon turn on. Next, check
that EvapFM energizes. If not, confirm that DS is engaged. Check across DS for 5VDC.
If 5VDC is not present, check DS activation lever and DS continuity. Note: DS contacts
are open when DS is engaged. If 5VDC is present, check CB EvapFM connector for
12VDC. If 12VDC is not present, replace CB. If 12VDC is present, check EvapFM wiring
connector for loose connection, EvapFM continuity, and fan blade for binding.
8)
Cool Down–EvapFM icon is on and Comp icon turns steady.
EvapFM continues.
2-min. Comp delay timer terminates. Comp energizes and 3-min. Comp run timer
starts.
Diagnosis:
Confirm CTh is at least 4
°
F above setpoint. Next, check that Comp
energizes. If not, check CB Comp connector for 115VAC. If 115VAC is not present,
confirm CTh status. See "IV.C. Thermistor Check." If CTh is in range and 115VAC is not
present, replace CB. If 115VAC is present, and Comp is off, check Comp wire harness
connections. Next check Comp external protector (integrated with start relay), Comp
start components, and Comp motor winding continuity. If Comp energizes and the
cabinet does not cool down, check for air leaks around the door (gasket), a restriction in
the refrigeration circuit, or refrigerant leak.
9)
Cool Down Achieved
–
EvapFM icon is on.
CTh cools to setpoint (default 39°F).
EvapFM continues. If Comp run time > 3-min., Comp icon turns off and Comp
de-energizes. If Comp run time < 3-min., Comp continues until 3-min. Comp run timer
terminates, then Comp icon turns off and Comp de-energizes.
Diagnosis:
If CTh is
in range and Comp does not de-energize, confirm Comp run time > 3 min. If Comp
continues after 3-min. Comp run timer terminates, replace CB.
10)
Cool Down Restart
–
EvapFM icon is on.
CTh warms to 4°F above setpoint (default
39°F). Comp icon turns on and Comp energizes. 3-min. Comp run timer starts.
Diagnosis:
See step 8 above.
11)
Defrost–EvapFM and Defrost icons are on. Cabinet Temperature is Displayed.
a) Automatic Defrost Initiation:
6-hr. DT terminates. 30-min. DT starts. EvapFM
continues. If Comp run time < 3 min., Comp icon and Comp continue until 3-min.
Comp run timer terminates. Once 3-min. Comp run timer terminates, Comp
icon turns off, Comp de-energizes, and defrost starts.
Diagnosis:
Has 6-hr. DT
terminated? If defrost icon is on, confirm that Comp de-energizes. If not, confirm
Comp run time > 3 min. If Comp continues after 3-min. Comp run timer terminates,
replace CB.
b) Manual Defrost Initiation:
To initiate a manual defrost, press and hold the "+" button
until the defrost icon turns. 30-min. DT starts. EvapFM continues. If Comp run time
< 3 min., Comp icon and Comp continue until 3-min. Comp run timer terminates.
Once 3-min. Comp run timer terminates, Comp icon turns off, Comp de-energizes,
and defrost starts.
Diagnosis:
If defrost icon is on, confirm that Comp de-energizes.
If not, confirm Comp run time > 3 min. If Comp continues after 3-min. Comp run timer
terminates, replace CB.
Содержание HR24A
Страница 25: ...25 B Wiring Diagram 1 HR24A ...
