Heavy Duty Fdo Control Thermostat - Garland G Series Technical Reference Manual

Heavy Duty FDO Control Thermostat

The FD Control is a heavy duty, high capacity gas thermostat.
It is a modulating snap by-pass.
Garland uses the FD Control for range ovens and Pizza decks.
Adjustments are at the front for by-pass and temperature
calibration.
Instructions for Model FDO
Heavy Duty Control
Indicator Mark
Dial
Stop
MODEL
FDO
Calibration
Plate
The model FDO is a precision made instrument, carefully set
at the factory to accurately control oven temperatures, from
150° F (66°C) to 500°F (260°C). All adjustments are accessible
from the front of the appliance after removing the dial. To
remove the dial, grasp the knob portion and pull straight out.
Page 44
1. With the oven cold, turn the dial counter-clockwise slowly
2. Remove the dial.
3. With a screw driver, turn the bypass fl ame adjuster
4. Replace the dial. CAUTION: While making this adjustment,
Below is the dial insert used by Garland on FD Control
thermostats. Note the space between 300°F and the 350°F
mark.
By-pass Flame
Adjuster
Calibration
Lock
Screws
B
Re-calibration
Field re-calibration is seldom necessary, and should not
be resorted to unless poor cooking results defi nitely prove
that the control is not maintaining the temperature to
which the dial is set. To check the oven temperature when
re-calibrating use an indicating potentiometer or reliable
mercury oven thermometer.
1. Place the thermocouple of the test instrument or
2. Light the main burner. Observe which indicator mark
3. Turn the dial so 400°F (240°C) lines up with the "low
from "Low Stop", until the bypass seat just snaps on.
screw counter-clockwise to increase the bypass fl ame
or clockwise to decrease the entire fl ame to a minimum
stable fl ame.
if the oven should become heated while the dial is set at
a low range below 350°F (177°C), the bypass fl ame will
shut off completely. If this occurs, turn the dial counter-
clockwise slowly until the bypass gas snaps on. Then
check the bypass adjustment as stated.
thermometer in the geometric center of the oven.
aligns with the low stop position of the dial. Use this
indicator mark for all settings.
setting" indicator mark.
Part # GCTRM Rev 3 (12/10/09)