Frymaster Universal Holding Cabinet, Руководство по обслуживанию, Страница: 34 / 55

14-3
14.7 Heater Plate
1. Disconnect power to the cabinet. On stand-alone units, remove side and top panels. On stacked
units, see Service Procedures for instructions on accessing the top panel.
2. Disconnect the black heater lead and the two RTD leads (brown and red) of the suspect plate
from the master board. Measure resistance of the heater from the black lead to any terminal on
the white terminal block. Resistance should be 140-150 ohms.
3. Measure resistance across the brown and red RTD leads. Resistance must be within a range of
104-148 ohms. Resistance at room temperature is approximately 107 ohms. See chart on
Page
18-5 for resistance at different temperatures. If either resistance is incorrect, replace the heater
plate.
14.8 Display Meanings
1.
SLOT TEMP HIGH OR SLOT TEMP LOW
and no audible alarm. This is normal when
the slot is changing temperature in association with a menu change.
2.
LLLL
means the RTD indicates a temperature below 50°F (10°C). Unit will automatically heat
at 20 percent until temperature is above 50°F (10°C), then operate normally.
3.
HHHH
means RTD indicates the temperature is above 255°F (124°C), but below "Open" circuit
resistance, which causes
SENS ALARM
.
4.
UHC VERSION _ _ _
(version number will vary) appears for five seconds when the unit
is turned on. This is normal. If the
UHC VERSION _ _ _
stays in the display, the normal
cause is 120 VAC is applied instead of the nominal 200 to 250 VAC.