Beckett CG50 - Manual (Page 15)

15 CG15, CG25, CG50 Burner Manual
Figure 9A - Typical Wiring Using Model RM7897C for High/Low Control (For Reference Only)
in the RUN mode until the load demand is satisfi ed
or a limit opens.
For High/Low control wiring (Figure 9A), if
terminals RC1 and RC2 are jumpered, the burner
operates in the Low-High-Off mode. The burner
starts at Low and goes to High after the fl ame
stabilization period. Flame is extinguished when
the load is satisfi ed or a limit opens, and the
burner is sent to post purge.
For High/Low control wiring (Figure 9A), if a high
/ low control has been wired between terminals
RC1 and RC2 the burner starts at Low and is
released to go to High after the fl ame stabilization
period. It can repeatedly cycle between low and
high as necessary to meet load demand until the
load is satisfi ed or a limit opens, and the burner is
sent to post purge.
For modulating control wiring (Figure 9B), the
○
○
○
burner starts at Low and is released to modulate
after the fl ame stabilization period. It can modulate
between low and high as necessary to meet load
demand until the load is satisfi ed or a limit opens,
and the burner is sent to post purge.
Load Satisfi ed – The fuel valves are closed. After
a 15 second post purge, the burner switches to idle
until the next call for operation. 8.
This operation sequence is typical
and for reference only. The primary
control could vary, depending on the customer specifi cation
and code requirements. For the specifi c operating
sequence that applies to your installation, consult the
appliance manufacturer’s directions, wiring instructions,
and control manufacturer’s literature supplied with your
burner.
Section: Sequence of Operation