Honeywell Pressuretrol P7810A Product Data page 8

P7810A-D PRESSURETROL® CONTROLLER
The High Limit Setpoint can be set above the internal stored
Maximum Fixed Stop Limit Value but it will have no functional
effect. For example the internal stored Maximum Fixed Stop
Limit Value is 12 psi and the knob is set at 14 psi. Lockout will
occur at 12 psi. the LED pattern will be green on and yellow
blinking fast.
When pressure increases to the high limit setpoint, the (1K1,
2K1) relay contacts open and the P7810C,D indicates a safety
lockout by alternately flashing the yellow and green LEDs.
Reset Switch Action
Press and Continuously Hold
Press and Release
P7810 Pressuretrol® Controller Setup
For P7810B,C and D Pressuretrol® Controllers with more
than one function(control, modulate and high limit [P7810C
and D]), adjust setpoints and differentials separately for each
function.
CAUTION
Equipment Damage Hazard.
Improper setting of control setpoint and control
range knob errors can damage the P7810.
Do not set control setpoint or control range knob
arrows past the scale plate endpoints.
Adjust setpoints and differentials using the knobs on the front
of the P7810 Pressuretrol® Controller.
Set the knobs to the desired points by aligning the center of
the knob arrow with the desired mark on the scale plate. See
Fig. 13.
Fig. 13. Setting control setpoint and control range knobs.
IMPORTANT
P7810C,D devices must set Maximum Fixed Stop
Limit Value function first.
65-0268—1
Table 4. Reset Switch Function, P7810A,B.
Lockout
Blink existing fault code until the reset
switch is released.
Clear the fault code and reset the P7810. Resets the control.
SCALE
PLATE
DIAL ARROW
M4880A
8
The P7810C,D remains in this condition until the manual reset
button (see Fig. 1) is pressed. The Alarm (3K1) relay contacts
will close, providing a 120 Vac output on the Alarm terminal.
Reset Switch Functions
The Reset Switch has the functions listed in Tables 4 and 5.
P7810A,B Modes of Operation
The green LED turns off and the yellow
LED turns on, waiting until the reset
switch is released.
Setting Maximum Fixed Stop Limit Value
(P7810C,D)
CAUTION
Equipment Damage Hazard.
Exceeding pressure vessel limits can damage
equipment.
The Maximum Fixed Stop Limit pressure setting
must not exceed the maximum working pressure
rating of the pressure vessel. Adjust the Maximum
Fixed Stop Limit setting to maximum working
pressure rating that is stamped on the pressure vessel
by the manufacturer.
IMPORTANT
The Maximum Fixed Stop Limit Value must be
programmed first for the P7810C or D to operate.
1. Initial Startup—Maximum Fixed Stop Limit Value is
unprogrammed.
a. Green LED (Control LED)—Blinking rapidly (1/2
second on, 1/2 second off).
b. Yellow LED (Power LED)—On steady and bright.
2. Setting the Maximum Fixed Stop Limit Value.
a. Monitor the 4 to 20 mA output. Long filtering delays
cause a lag between the 4 to 20 mA output and the
limit setting, i.e., 20 to 25 seconds for a full scale
change.
b. Turn the Limit Setpoint knob to the desired setting
and confirm by comparing the current noted to the
corresponding reading in Table 6. Ensure that the
mA output is stable before using the value.
c. Press and hold the Reset Switch.
d. Release the Reset Switch when both LEDs turn on.
e. The Maximum Fixed Stop Limit Value is set and the
device will recycle and attempt to enter Run mode.
f. After an accumulated run time (Call for Heat) of one
hour, the Maximum Fixed Stop Limit Value setting
will be permanently stored in the P7810C,D
memory. Changing the Maximum Fixed Stop Limit
Value setting after this time will then be ineffective.
(Run) Normal Operation