Model FF-2500 Proportioning Unit
26
25942-1, Issue 4
6. HEATING RODS- If the primary heater has any of these symptoms listed below it is
possible that one or more of the four heating rods are not working.
•
primary heater turns on, but takes excessively long to reach the temperature
desired. (Normal warm-up is about 2 minutes)
•
primary heater has abnormally long “ON” cycles.
•
primary heater does not turn off during dispensing.
The primary heater contains four 1500-watt (34 ohms each) heating rods wired in
parallel. To check operation of the rods, proceed as follows:
a) Turn OFF and lock out incoming power at the source.
b) Remove the heater cover box by removing the acorn nut and sliding the cover
box away from the heater.
c) Read the resistance across the four Heating Rods. The resistance should be 8.5
ohms. A higher resistance indicates that one or more rods are not working.
If this is the case, proceed to step d).
d) Disconnect the heating rods and measure the resistance of each rod. Each rod
should measure 34 ohms. If not replace the faulty rod or rods. DO NOT under
any circumstances operate the primary heater with one or more heating rods
missing.
The design of the primary heater allows it to maximize the heat transfer from the
power available. However, under certain conditions, reducing the flow rate is
necessary when the heater is not able to reach the required temperature.
