9
2.4.7
Intermediate piping
Pipe as required between the terminal and the burner.
Ensure that the 3” (7.6 cm) piping is routed and supported in
accordance with local and national codes. Obey minimum
furnace clearances to combustibles when routing any
sections of 3” (7.6 cm) piping in the vicinity of the furnace.
2.5
INSTALLATION OF THE BVSO JUMPER
On units equipped with a BVSO connector, the jumper
provided and also included in kit #B03396 must be installed.
Refer to the instructions included with the kit and Figure 11
of this manual.
Figure 11 : BVSO jumper
3.0 OPERATION
The system is a sealed combustion system which means
that the furnace is isolated in relation to the interior of the
building. Therefore, the burner is not affected by pressure
fluctuations, making it ideal in buildings of air tight
construction.
A sealed combustion system can only be installed on
approved furnaces. Refer to the nameplate on the furnace
and Table 3 of this manual.
3.1
COMBUSTION GAS TEMPERATURE
VERIFICATION
After adjustments are made, based on the installation
instructions contained in the oil furnace manual, it is
recommended that a combustion gas temperature check be
made at the exit of the direct vent system. The reading
should be 93°C (200°F). In case it is impossible to obtain
this temperature after 5 minutes of operation, it is
recommended to relocate the furnace in order to shorten the
length of the vent pipe.
After the modification, let the system cool down for about 30
minutes and recheck by taking another reading, again after
a minimum of 5 minutes of operation. The temperature must
be at least 93°C (200°F).
3.2
BURNER POST PURGE DELAY ADJUSTMENT
The post purge delay on the oil-fired burners is factory set to
zero second. This delay is applicable for all installations with
chimney venting. For heating units installed with side wall
venting, the post purge delay must be set to 15 seconds
when installed with a Beckett burner. Post purge delay is not
necessary with a Riello Burner. Refer to the burner control
instruction manual and marking for proper adjustment of the
post purge delay.
4.0 MAINTENANCE
CAUTION
Before doing any servicing, be sure to shut off the fuel
supply and electrical power to the furnace. The 115 volt
circuit is dangerous and can potentially electrocute.
Refer to the installation manual for servicing the furnace.
Maintaining a sealed combustion system is the same as
maintaining a chimney with the following particularity:
Note: To perform maintenance service, remove the breech
plate by removing the brass nuts (see Figure 9). The
transition
(item H)
must not be removed from the flexible
vent pipe assemblies.
DNS-1165 Rev A
