User Guide

28
VII: SYSTEM START-UP (continued)
7. CAD CELL LOCATION AND SERVICE
The burner is supplied with a cadmium sulde ame
detector mounted at the factory, mounted on the
bottom of the electronic ignitor. See Figure 22. To
service cad cell or to replace the plug in portion,
swing open the ignitor. After service is complete, be
sure to fasten down the ignitor.
I. CHECK FOR CLEAN CUT OFF OF BURNER.
1. AIR IN THE OIL LINE between fuel unit and
nozzle will compress when burner is on and will
expand when burner stops, causing oil to squirt from
nozzle at low pressure as burner slows down and
causing nozzle to drip after burner stops. Usually
Figure 22: Cad Cell Location
cycling the burner operation about 5 to 10 times will
rid oil line of this air.
2. IF NOZZLE CONTINUES TO DRIP, repeat
Paragraph H, Step 1 above. If this does not stop the
dripping, remove cut-off valve and seat, and wipe
both with a clean cloth until clean, then replace and
readjust oil pressure. If dripping or after burn
persist replace fuel pump.
J. TEST CONTROLS
1. Check thermostat operation. Raise and lower
thermostat setting as required to start and stop
burner.
WARNING
Before installation of the boiler is considered
complete, the operation of all boiler controls must
be checked, particularly the primary control and
high limit control.
2. VERIFY OIL PRIMARY CONTROL FEATURES
using procedures outlined in Instructions furnished
with control or instructions as follows:
a. GeniSys 7505 Control Features, see Figure 23
i. The GeniSys 7505 is a microprocessor-
based control. The indicator light provides
Figure 23: GeniSys 7505 Oil Primary Terminals,
LED's and Reset Button
diagnostic information for lockout, recycling
and cad cell status. There is a manual reset
button to exit the Lockout Mode.
ii. Pump Priming Cycle: To facilitate purging
air from the oil lines and lters, the 7505 can
be placed in a purge routine by:
• After the burner starts, press and hold the
reset button for 15 seconds until the
yellow light turns on. This indicates that
the button has been held long enough.
• Release the reset button. The yellow
light will turn off and the burner will start
up again.
• At burner start up, click the reset button
while the igniter is till on. This will
transition the control to a dedicated
Pump Prime mode, during which the
motor, igniter, and valve are powered for
four (4) minutes. The yellow light will be
on.
• At the end of four (4) minutes, the yellow
light will turn off and the control will
automatically return to standby mode.
iii. Limited Recycle: This feature limits the
number of recycle trials (for each call for
heat) to a maximum of three trials. If the
ame is lost three times and does not