Install Instructions

23
Figure 11: Burner Disconnect Junction Box with Power Outlet Receptacle
(Mated to Burners with Disconnect Harness)
c. Refer to Paragraph R for details on use of
burner disconnect junction box provided with all
knockdown boiler builds.
Q. INSTALL TRIM AND CONTROLS WITH
RIELLO BURNER.
Water Boilers Only (see Figures 1A, 1B, 1C and 5).
Follow instructions in Paragraph N, Steps 1 through 7.
Steam Boilers Only (see Figures 1D and 5).
Follow instructions in Paragraph O, Steps 1 through 6.
7. Connect Field Wiring
a. Steam boiler with Hydrolevel CG450,
McDonnell & Miller PS-801 or McDonnell &
Miller 67 LWCO, Riello Burner.
Connect the eld wiring to the R8239A Control
Center. If equipped with tankless heater, connect
eld wiring from the aquastat control to the
R8239A Control Center’s “R-G” terminals.
Make the wiring connections as shown in
appropriate wiring diagram, refer to Figure 22,
23A, 23B, 24A or 24B.
Note: DO NOT remove "T-T" jumper unless
wiring diagram indicates a direct connection
from thermostat and/or tankless heater aquastat
control to the oil burner primary control's "T-T"
terminals.
Also refer to Section XI, Paragraph I, Item 2,
"Verify Oil Primary Control" for more details.
b. Refer to Paragraph R for details on use of
burner disconnect junction box provided with all
knockdown boiler builds.
R. BURNERS SUPPLIED BY U.S. BOILER
COMPANY utilize a burner disconnect harness that
is pre-wired into the burner junction box and primary
control. Packed in the canopy carton is the mating
burner disconnect junction assembly and mounting
hardware for use with these burners.
SECTION III: KNOCKDOWN BOILER ASSEMBLY (continued)