25
RFHU - Multiuse Operator’s Manual
TEMPERATURE CHECK PROCEDURE
1. A digital temperature meter that has been
calibrated must be used to get an accurate
temperature reading. Use a thermocouple
surface temperature probe to measure
temperatures.
2. No pans should be in wells during the pre-
heat and temperature check. Pre-heat the
warmer for 30 minutes before taking any
temperature readings. Do not take readings
unless the cavity has been empty for 30
minutes. This will allow the temperature to
stabilize and will prevent false readings.
3. The warmer cavity should be cleaned and
empty before the temperature is checked.
Avoid any air drafts that might ow through the
cavity.
4. Temperature readings should be taken when
standing on the front side of the unit with on/
o switch. Locate the surface temperature
probe on the bottom of the rst cavity. Position
the probe half way back on the heat sink
beneath the rail as shown. The top readings
should be taken on either side of the rail half
way back on the heat sink. Four wide units
require 2 readings, left and right side.
5. All temperature controls exhibit a swing in
temperature as the control cycles on and o
while regulating to the set point. The correct
calibration temperature is the average of several
readings taken over a period of 20 minutes after
the warmer has been pre-heated. The average
temperature should be no greater than ± 10°F
(± 6°C) from the set point.
6. The allowable range of well temperatures
which can be programmed on the RHFU) is
140°F-280°F (60°C-137.8°C).
7. If the calibration temperature is greater than
+/- 10F (6C) from the set point, adjust the
temperature oset as described under the Tools
menu. The oset value should be set as the
dierence between the calibration temperature
and the set point.
8. Repeat for all heat sinks.
Center Probe Front to Back
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