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Figure 8: Float-Type Low Water Cut-Off and
Pressure Limit Installation
Figure 9: Pressure Limit Installation for Probe
LWCO Equipped Boilers
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. 2
e. An L404F pressure limit does not require
leveling.
7. On units with a heater opening, install the aquastat
controller well in the ½" NPT or ¾" NPT tapping in
tankless heater plate or cover plate. Slip the bulb of
the aquastat into the well and secure the control in
place with the set screw.
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8. Connect the fi eld wiring to the pressure limit, the
LWCO, the R8239A Control Center/J-box and the
burner J-box or burner disconnect J-box.
If equipped with tankless heater, connect fi eld
wiring from the aquastat control to the R8239A
Control Center transformer terminals or oil burner
primary control's "T-T" terminals.
Make the wiring connections as shown in Figures
19, 20 and 21.
NOTE:
• The R7184P Primary Control has pre-installed
• Do not remove (cut) "T-T" jumper unless
Refer to Paragraph S for details on use of burner
disconnect junction box provided with all
knockdown boiler builds.
O. INSTALL TRIM AND CONTROLS WITH
BECKETT BURNER. - Water Boilers Only (See
Figures 1A, 1B, 1C and 5).
1. Thread ½" NPT pipe plugs into gauge glass tappings
in the upper right side of front section.
2. Thread ¾" NPT pipe plug in probe low water cut off
n i
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tapping (just left of gauge glass tappings).
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3. Thread combination pressure/temperature gauge into
n i
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¼" NPT tapping. Tighten with wrench applied to the
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square shank of the gauge.
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4. Screw drain valve into ¾" NPT side outlet of the
. c
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1½" NPT x 90° elbow (note - lower front section
tapping "G" is used for standard return on water
boilers).
5. If circulator (not supplied with boiler) is to be
mounted directly to 1½" NPT boiler return tapping
"G", use the piping arrangements outlined in steps a.
thru e. as follows: (see Figures 13A, 13B and 13C)
a. Thread 1½" NPT x 3" long nipple and 1½"
W
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"T-T" jumper resistor. To activate "T-T"
terminals, "T-T" jumper must be removed. To
remove, use side cutting pliers to cut jumper (see
Figure 28).
wiring diagram indicates a direct connection
from thermostat and/or tankless heater aquastat
control to the oil burner primary control's "T-T"
terminals.
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NPT x 90° elbow with ¾" NPT side outlet
into the return tapping and tighten with a pipe
wrench.
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