Model DP Oil-Fired Heater
Page 15
SECTION 7.
Operating Instructions
7.1 Normal Operation
The XL-3 heater is capable of automatic
operation based on a call for heat at preset
temperatures. The heater has an internal safety
system which allows operation in a variety of
conditions and prevents operation when certain
adverse conditions are encountered.
When the heater is powered, water is flowing
through the heater, and the temperature of the water
entering the heater is below the temperature control
setting, an operating cycle is initiated by the automatic
control. The ignition cell will energize, the burner
motor will start and fuel will be forced through the
nozzle into the firebox where it is ignited. Operation
will continue until the temperature of the water
entering the heater reaches the temperature control
setting.
If ignition is unsuccessful, or if the flame fails
during normal operation, the ignition control shuts off
the motor. Subsequent cycles are initiated after the
reset button on the ignition control is pushed.
When every part of the system is working
properly, the heater will go through the following
detailed sequence:
1.
When the filter pump builds up enough pressure
in the piping, the contacts in the heater pressure
switch close.
Figure 14. Wiring Diagram, 60 Hz Model.
2.
The heater thermostat calls for heat completing
the circuit between the two thermostat terminals
on the primary control of the oil burner.
3.
The primary safety control on the oil burner goes
through a self-test sequence. One of the steps in
the sequence is to check out the cadmium cell
flame detector. If the cad cell senses light, the
burner will not fire. If everything checks out, the
burner motor and ignition transformer are
powered. The ignition transformer operates
during the entire burner operation.
4.
If the cad cell does not sense a good flame within
30 seconds the primary control de-energizes the
motor and ignition transformer. This turns off the
heater. It can be manually restarted by pushing
the reset button after waiting about one minute.
5.
During the period when the filter pump is running,
which is set by the time clock, the thermostat will
turn the burner on and off as required to maintain
the water temperature set on the thermostat.
6.
If a time clock is used, the contacts in the
Fireman switch open about 20 minutes before the
pool filter cycle is completed. This shuts off the
oil burner. The oil burner cannot be restarted
during this period. The filter pump continues to
run for another 20 minutes, transferring any heat
stored in the firebox to the pool.
Содержание DP3000
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