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MISCELLANEOUS COMPONENTS
CONTROL STOP/START
The Main Control circuit is energized by pushing the
green START button. The green light on the START
button indicates the control circuit is ON and that all the
safety switches are reset.
Push the red STOP button to stop the dryer control cir-
cuit.
FAN SWITCHES
The group of FAN switches controls the UPPER and
LOWER fan motors. The green START button will light
when the fan motor contactor has been energized.
MAIN/SAFETY GAS SHUT-OFF VALVE
VALVE OPERATION — This valve is an electrically
energized, manual reset type valve. The valve's elec-
tric solenoid is energized only when the dryer CON-
TROL CIRCUIT is turned ON. See Figs. 6-1 for valve
location.
The valve has a "free handle" lever that cannot allow
gas flow to the dryer until the dryer control circuit is
energized. Only then does the lever engage to allow
the handle to be manually raised to the latched posi-
tion, thereby opening the valve. The gas flow will stop
when the valve's solenoid is de-energized (see CAU-
TION below).
CAUTION: Do not use the operating handle to close
the valve. Always de-energize the electrical hold-
ing circuit while the valve is fully open for positive
closing action.
An "open" and "shut" indicator is provided on the side
of the Main/Safety Shut-off valve. (An orange indicat-
ing bar aligns itself with the words "open" or "shut.")
See Fig. 6-2.
BURNER SWITCHES
The group of BURNER switches controls the UPPER
and LOWER burners. Each burner switch has a red
light to indicate a LOCKOUT condition.
Each burner is ignited by turning the appropriate burn-
er switch ON. Ignition should take place after a short
purge time.
NOTE: In order to light the burner, the Main/Safety Gas
Shut-off Valve's handle must be manually reset to
OPEN and the appropriate fan must be ON.
Both burner switches should be ON for FULL HEAT
drying. The lower burner switch should be OFF for
DRY/COOL drying. Turn the burner selector switch
OFF to stop each burner.
A dryer shutdown will occur and the appropriate burner
LOCKOUT light will be energized if the burner fails to
ignite or the burner flame is not sensed for a period of
approximately 60 seconds. Several minutes may be
required to allow the lockout to automatically reset itself
before ignition may again be attempted.
PLENUM TEMPERATURE CONTROLS
PLENUM CONTROLLER OPERATION — Drying tem-
peratures are controlled by the Electronic Temperature
(ET) plenum controllers located on the ASC control
panel. Each fan-heater is controlled by a separate con-
troller (see Fig. 6-7).
The controller senses air plenum temperature and
cycles burner from Hi-Fire to Lo-Fire operation to main-
tain desired drying temperature as indicated by plenum
temperature indicator on the asc panel.
CHECKING AND ADJUSTING PLENUM TEMPERA-
TURE — To determine drying temperature within the
air plenum chamber(s), depress the appropriate
CHECK SWITCH (labeled "HOLD TO READ") and
observe temperature indicated on the meter. To reset
the plenum drying temperature, simply rotate the prop-
er adjustment knob to the desired temperature setting.
The ET system will automatically cycle the burner to
maintain the set temperature (see Fig. 6-7).
HI/LO FIRE PRESSURE CONTROLS
HI-FIRE / LO-FIRE — When a heater is operating on
Hi-Fire, its burner is supplied with a relatively large flow
of gas from both the Hi-Fire gas solenoid valve and the
Flow Control valve. When a heater is operat ing on Lo-
Fire, only the Flow Control valve supplies gas flow to its
burner.
PROPANE HI-FIRE — On propane models, the Hi-Fire
gas pressure for the burner is controlled by the Gas
Pressure Regulator. For maximum heat capacity, the
regulator should be adjusted WHILE OPERAT ING ON
HI-FIRE to provide maximum burner pressure, as
shown by the pressure gauge on the unit. For maxi-
mum pressure, see Table 2-1 - Fuel System
Specifications (maximum listing for LP "Operating
Pressure Range").
NATURAL GAS HI-FIRE — For natural gas models,
the Hi-Fire gas pressure is controlled by adjusting the
large Manual Shut-off valve within the line which sup-
plies the fan-heater. For maximum heat, set the shut-
off valve to provide approx. 8 PSI of pressure WHILE
BURNER IS OPERATING ON HI-FIRE. For maximum
pressure, see Table 2-1 - Fuel System Specifications
(maximum listing for Natural Gas "Operating Pressure
Range").
LO-FIRE — The Lo-Fire gas pressure is controlled by
the Flow Control valve (see Fig. 6-4).
PROPANE LO-FIRE — On propane models, set the
Lo-Fire gas pressure to the lowest setting listed in the
LP "Operating Pressure Range" in Table 2-1, by rotat-
ing the knob on the Flow Control valve. Lock setting
with an Allen wrench after making this adjustment.
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