SPX Marley NC8409 - Intermittent Wintertime Operation

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Intermittent Wintertime Operation:
Ifperiodsofshutdown(nights,weekends,etc.)occurduringfreezing
weather,measuresmustbetakentopreventthewaterinthecold
waterbasin—andallexposedpiping,bothinternallyandexternally—
from freezing.
Several methods are used to combat this, including:
—automatic water basin heater systems available from Marley.
— field installation of heat tracing of piping, both internally and externally.
— field modification to provide a weep hole by drilling a
3
⁄16" hole in PVC piping,
7” up from the base of the flange of the internal riser. The hole should be
plugged with a ¼" tap screw with sealing washer. For steel piping, drill a
13
⁄64"
diameter hole 2" up from the base of the flange of the internal riser and tap
for a ¼-20 bolt with sealing washer that will be used as a plug. See figures
below for drilling details. Normally weep holes are plugged during tower
operation and plugs removed during downtime in freezing temperatures. To
leave the hole unplugged during operation, drill a
3
⁄16" hole at an upward angle
that will allow the water flow to drain downward into the basin.
Unless some means of freeze prevention is incorporated into your
system,thetowerbasinandexposedpipeworkshouldbedrained
at the beginning of each wintertime shutdown period.
If tower basin is drained, verify that all basin heaters have been shut
off either by automatic cutoff or disconnect switch.
It is recommended that you discuss your freeze prevention options with your
local Marley sales representative.
Caution
operation
Warning
DRILL FOR PLUGGING HOLES
DRILL FOR NO PLUG
TAP SCREW
OR BOLT
Warning