Specifications

LWLCWH COLUMBIA BOILER COMPANY REV. 13106

LENGTH OF PROBE ROD IN “WL” AND UP TO” CWH-780 & UP” SERIES BOILERS

BOILER WL-60 WL-90 WL-120 WL-140 WL-180

MODEL CWH-780 CWH-1200 CWH-1510 CWH-1810 CWH-2460

ROD LENGTH 14-1/2" 14-1/2" 14-1/2" 14-1/2" 14-1/2"

Table 1b

Other secondary LWCO s include combination LWCO / Water Feeders. These devices are typically

connected externally using an equalizing line, and piped into the available 1" NPT fittings found in

boiler top, and left side or front. Most commonly used combination units are McDonnell & Miller 42

Series Pump Controls and Low Water Cut-Off or McDonnell & Miller No. 247-2 Feeder Combination.

For piping diagram, see the List of Figures on the Table of Contents Page of this manual.

NOTE: Mount a combination unit so the low water cut-off line on the device is approximately 3

inches above the lowest permissible water level plate found on the left side jacket panel of

he boiler.

Water Gauge

The water gauge is piped into the (2) 1/2" NPT fittings located in the left side of the boiler. During oper-

ation, the boiler s water level should always be above the Lowest Permissible Water Level indicator

label found on the left side jacket panel of the boiler. Hot water boilers do not require a Water Gauge.

Pressure Controls

Low pressure, 15 PSI controls are supplied with steam units only. These controls consist of an

Operating Control and a Safety Limit. An additional operating control may also be supplied for burn-

ers that function with low-high-low operation. Pipe the Pressure Control and the 30 PSI Steam Gauge

using the supplied steam syphons. See Drawing PL-099 in the Appendix.

The Pressure Control must be level in order to operate accurately. A Pressure Control is level when

the leveling indicator hangs freely with its pointer directly over the index mark, inside the back cover

of the case.

Aquastat Controllers

Aquastat Controllers are used to regulate boiler water temperature. Columbia supplies an Operating

Control (Honeywell L4006A Aquastat

) and a Safety Limit (Honeywell L4006E Aquastat

) with all hot

water boilers and water heaters. An additional Operating Aquastat

may also be supplied for burners

that function with low-high-low operation or steam boilers using an optional coil. Aquastat

’s are

mounted in the 3/4" NPT fittings located on the coil plate on the front of the boiler.