Grain Systems PNEG-584 - Manual (Page 14)

14
SERIES TWO HEATER
1. At heater turn toggle switch
to "ON" position.
2. Press the "PROGRAM TEM-
PERATURE" button.
3. Use the increase or decrease
button to set the "PLENUM
HIGH LIMIT SET POINT" to
desired setting (100°-160°*).
4. Press the "PROGRAM TEM-
PERATURE" button to continue
to set the "CYCLE SET
POINT". (hi-lo units only)
5. Use the increase or decrease
buttons to set the "CYCLE SET
POINT" to desired setting
(90°-150°*) (hi-lo units only).
6. Press the "PROGRAM TEM-
PERATURE" button to continue
to set the "TEMPERATURE
DIFFERENTIAL".
7. Use the increase or decrease
buttons to set the "TEMPERA-
TURE DIFFERENTIAL" to
10°*.
8. Open all manual gas shut off
valves, on and to the heater unit.
9. Start the fan unit.
10. Make sure that the blade is spin-
ning in the right direction. If not
place the toggle switch in the
"OFF" position and correct the
problem.
11. After the fan reaches full speed
the display should read "AIR-
FLOW" in the upper right hand
corner.
12. Press the start button on the
heater control.
13. After 10 seconds the burner
should ignite. If not, turn "OFF"
the toggle switch and then back
"ON". Repeat 12-15.
14. When the burner ignites the dis-
play should read "HI-FLAME" at
the left of the display. Loosen the
nut on the main regulator and turn
screw in, to increase pressure and
out to decrease pressure. The
pressure gauge should be set at
10-15 lbs. for LP units, or 4-6 lbs.
for natural gas units. (use the
charts on the following pages to
set pressure)
15. Press the "PROGRAM TEM-
PERATURE" button to
change the high limit set
point. Press i t
again to change the "CYCLE
SET POINT". (hi-lo units only)
16. Decrease the "CYCLE SET
POINT TEMPERATURE" until
the heater cycles to low flame. (hi-
lo units only)
17. Open or close the low cycle ball
valve until the gas pressure is
3-5 lbs. for LP, or 1-2 lbs. for
natural gas. (hi-lo units only)
18. Increase the cycle set point to
return to high flame. (hi-lo units only)
19. Watch heater run several min-
utes to make sure it cycles be-
tween hi and lo flame or on and
off properly.
20. Hi-flame pressure should be
adjusted so plenum reaches cy-
cling temperature easily.
21. Adjust pressure on on/off units
so that unit is on approximately
75% of the time.
After heater power is turned on, the
fan must be turned on. Attempting
to start the dryer without the air
switch indicating there is airflow will
cause an airflow alarm to go off when
the start switch is depressed. The air-
flow alarm is simply the entire display
going blank, and the "NO AIRFLOW"
message flashing for a few seconds.
The display must show "AIRFLOW"
before the dryer can be started.
To start the dryer, just push the
"START" switch. The first message
to come up will be the "PURGE"
message--the drying process begins
with a 10 second purge.
When multiple heaters are con-
nected together, drying may be
started from any heater control.
Programming the temperature
differential.
SETTING GAS PRESSURE
STARTING THE DRYER
*Temperatures are fahrenheit.
HEATER OPOERATION PROCEDURE