P7810A-D PRESSURETROL® CONTROLLER
11
65-0268—1
Table 8. LED Fault Codes and Recommended Troubleshooting.
CHECKOUT
WARNING
Electrical Shock Hazard and Explosion Hazard.
Can cause severe injury, death or property
damage.
1. Live voltage is present at the P7810 and all
controller circuits. Use extreme care during
checkout.
2. This checkout procedure disables the Safety High
Limit function.
IMPORTANT
1. Do not put the system into service until all applicable
tests described in the Checkout section of the
instructions for the primary safety control and any
additional tests required by the burner or boiler
manufacturer are satisfactorily completed.
2. Close all manual fuel shutoff valves when trouble
occurs.
After installation and wiring, check out the P7810
Pressuretrol® Controller with the system in operation.
Checkout
1.
Allow the system to stabilize.
2.
Observe the operation of the P7810 while raising and
lowering the setpoint. Pressure increases when the
setpoint is increased and decreases when the setpoint
is decreased.
3.
Check the make and break points of the P7810. If they
do not agree with a separate, accurately calibrated
pressure gauge, make a slight adjustment according to
the scale. Use accurate pressure testing equipment
when checking out the P7810. Do not rely on
inexpensive gauges. The P7810 is carefully calibrated
at the factory.
Test the P7810 Pressuretrol® Controller as follows:
NOTE: Make sure the P7810 is operating properly by
checking the LED indicators. If the P7810 LEDs
indicate a lockout condition, press the manual reset
button.
NOTE: This procedure simulates pressure changes using
knob setpoint adjustments. Make knob adjustments
very slowly because of filtering delays within the
P7810 (20 to 25 seconds for full scale change).
Inaccuracy can result if knob adjustments are not
made very slowly. To observe actual P7810 control
accuracy, set the knobs to normal operating values.
Compare the knob settings to the boiler pressure
readings where P7810 actions occur.
To check the control setpoint of the P7810A,B,C,D:
1.
Note the boiler pressure by checking the boiler pressure
gauge. To properly perform these tests, the boiler
pressure should be near the middle of the P7810
pressure range.
2.
Turn the P7810 limit setpoint knob fully clockwise to
make sure this limit does not interfere during steps
4
and
5
. This setting must return to the proper operating
position when returning the system to normal operation.
3.
Check the control setpoint and control differential.
4.
Set the control differential knob to the center of its
range.
5.
Turn the control setpoint knob fully counterclockwise
and make sure the P7810 control circuit is open and the
green LED is off (no call for heat).
6.
Read the boiler pressure gauge and add this number to
the control differential setting.
7.
Turn the control setpoint knob slowly clockwise and
make sure the control circuit closes and the P7810 indi-
cates a call for heat (green LED on) when the P7810
control setpoint passes through the value determined in
step
6
.
8.
Turn the control setpoint knob slowly counterclockwise
and make sure the control circuit opens and the P7810
no longer indicates a call for heat (green LED off) when
the control setpoint passes through the boiler pressure
gauge value.
Check the modulation setpoint and modulation range of the
P7810B,C as follows:
1.
Set the P7810 modulation range knob to the center of
the range.
2.
Turn the modulation setpoint knob fully clockwise and
make sure the firing rate motor travels to the fully open
position (boiler is firing).
3.
Turn the modulation setpoint knob slowly
counterclockwise and make sure the firing rate motor
starts moving toward the closed position when the
modulation setpoint passes through the boiler pressure
gauge value. (Alternately, make sure the current starts
decreasing toward 4 mA.)
Fault Code
System Failure
Recommended Troubleshooting
11
High Limit Setpoint Exceeded.
When pressure in vessel returns to normal, P7810 can be reset.
12-32,
71-90, 92
Internal fault
Reset P7810; if same fault occurs again, replace P7810.
51, 54, 61
Internal fault—internal relays
welded
Verify loads do not exceed rating of P7810 contacts, then replace P7810.
52-69, 91
Relay fault
Verify that no voltage potential exists on Output terminal.
If code repeats after normal operation, look for back feed of voltage greater
than 50V (ac or dc) any time during boiler sequence.
Replacing P7810 will only result in same lockout on new control.
