Burnham MEGASTEAM MST288 - Manual (Page 20)

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7. Screw LWCO to External Wiring Enclosure wiring
harness (end with fork and female disconnect
terminals) connector into low water cut-off J-box
top fitting, and attach wires to the terminals per
LWCO wiring detail shown in Figure 9 "Float-Type
LWCO and Gauge Glass Installation".
8. Re-install #67 LWCO J-box cover.
9. Pick-up the LWCO harness Molex end and feed it
into the enclosure, thru external electrical enclosure
top flange front left 7/8” hole; then, snap-in harness
BX connector into the hole, and, plug-in Molex
connector into dedicated LWCO receptacle inside
the enclosure (middle left off transformer/relay). See
“ Control Plug-In Diagram” label attached to inside
of the enclosure cover for details.
10. Pick-up the pressure limit harness Molex end
and feed it into the enclosure, thru External
Electrical Enclosure top flange rear left 7/8” hole;
then, snap-in harness BX connector into the hole,
and, plug-in Molex connector into dedicated pressure
limit receptacle inside the enclosure (upper left off
transformer/relay). See “ Control Plug-In Diagram”
label attached to inside of the enclosure cover for
details.
P. AqUASTAT CONTROLLER INSTALLATION
(BOILERS wITH TANkLESS HEATER ONLY).
1. On boilers with tankless heater, install the L4006A
aquastat controller well (found in Part Carton) into
½” NPT tapping in tankless heater plate.
2. Remove the L4006A aquastat controller with factory
attached harness from Control Carton.
3. Slip the bulb of the aquastat controller into the well
and secure the controller in place with the set screw.
WARNING
Aquastat bulb must be fully inserted into the
well.
4. Feed the L4006A aquastat controller harness end
thru external electrical enclosure top flange middle
right bushed hole. See “ Control Plug-In Diagram”
label attached to inside of the enclosure cover for
details.
5. See Figures 19, 20 and 21 (whichever applicable)
for tankless heater aquastat connection details.
6. Using needle nose pliers form hook on harness each
stripped end and wrap hooks around screws under
terminals "R" and "G" of the R8285C Transformer-
Relay; then, tighten screws securely.
q. SAFETY VALVE AND DRAIN VALVE
INSTALLATION.
1. Remove safety valve and related piping (3/4”
NPT x 3” lg. black nipple, 3/4” NPT x 8” lg. black
nipple, ¾” NPT 90° black elbow and ¾” NPT black
coupling) from Part Carton.
2. Thread 3/4" NPT x 3” lg. black nipple into rear
section safety valve tapping, install ¾” NPT 90°
black elbow facing upward, then, thread 3/4" NPT
x 8” lg. black nipple into the elbow, and, install ¾”
NPT black coupling onto nipple end.
3. Thread safety valve into the ¾” NPT black coupling.
Pipe the safety valve discharge as shown in Figure
12 “ Recommended Boiler Piping For Gravity
Return Steam Boiler” shown in Section III of this
manual. Installation of the safety valve must be
consistent with ANSI/ASME Boiler and Pressure
Vessel Code, Section IV.
WARNING
Safety valve discharge piping must be piped near
floor to eliminate potential of severe burns. Do
not pipe in any area where freezing could occur.
Do not install any shut-off valves, plugs or caps.
4. Remove 1-1/2" NPT x 5” lg. black nipple, 1-1/2”
x 1-1/2” x ¾” NPT black tee and drain valve from
Part Carton.
NOTICE
Lower rear section Tapping "H" is used for
standard condensate return on steam boilers.
5. Thread 1-1/2" NPT x 5” lg. black nipple into lower
rear section tapping, then, install 1-1/2” x 1-1/2” x
¾” NPT black tee onto nipple end. Black tee side
outlet may be oriented to either left, or, right side.
6. Install the drain valve into black tee ¾” NPT side
outlet.
R. OIL BURNER INSTALLATION.
1. Install oil burner, refer to Figure 10.
a. Open burner carton and remove contents.
b. Check oil nozzle in burner for size, angle and
type, inspect electrode settings, check head
setting, check air band and air shutter settings,
refer to Table 8 at rear of this manual.
c. Place oil burner gasket on burner and align holes.
CAUTION
Do not install burner without gasket.
d. Remove three (3) 5/16-18 x 3/4 lg. cap screw
from burner swing door used for mounting
burner.
e. Thread (1) 5/16-18 x 3/4 lg. cap screw,
approximately three (3) full turns, into tapping
located at 12:00 o'clock on burner swing door.