J&R MANUFACTURING 250R-FS, Руководство по эксплуатации и обслуживанию

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TROUBLESHOOTING
N
OTE
:
Always de-energize the unit or the component in the unit before
servicing and tag switches to warn others that service is in progress.
1. N
O
P
OWER
(
NOTHING WILL ENERGIZE
)
Check the power supply to the unit. If no supply voltage or improper
voltage, then check the breaker box. If power supply is OK then check for
proper voltage at the contact block on the unit. If the voltage there is
improper then repair the supply wiring from the junction box or from the
plug (or repair the plug). If there is the proper voltage at the contact block
then check the control fuse block and the high limit thermostat for
continuity. Replace if no continuity.
2. C
ONVECTION
F
AN
I
NOPERATIVE
Check the fuse and the high limit thermostat. Note that the unit must
be in the “COOK” or “COOK and HOLD” mode with EVAC off for this fan to
operate. Check the Convection Blower Contactor and Overload (CBO) (36
and 36A) and reset if needed (see enclosed sheet on the reset procedures). If
overload has not tripped then check for proper voltage between terminals 4
& 6 of the CBO. If OK, check the Convection Blower Motor (10) itself. It has
internal thermal protection. Replace the motor if defective. If the voltage
between terminals 4 & 6 is not correct then trace the circuit rearward to find
the problem.
3. EVAC F
AN
I
NOPERATIVE
Check the fuse and high limit thermostat. This fan will be operative in
the “EVAC”, “COOK”, and “COOK and HOLD” modes. Duplicate the steps for
the convection fan described in #2 above except check the overload and
terminals on the EVAC Blower Contactor and Overload (35 and 35A) rather
than the Convection Blower Overload.
4. C
ABINET
C
OOLING
F
AN
(
S
) I
NOPERATIVE
These fans should run at all times when the unit is plugged in or wired
into a power supply. Check the power supply and verify the proper voltage
to the contact block on the unit. If they are OK then check the wiring to
each motor. If the wiring is OK the fans should be replaced.
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