Specifications

LWLCWH COLUMBIA BOILER COMPANY REV. 13106

Gauge Glass Replacement Instructions:

1. Make absolutely certain that the new water level gauge glass is 5/8" O.D. and is the

correct length Pyrex

red line, high pressure, high temperature glass tubing with fire

polished ends.

2. Close gauge glass valves.

3. Remove gauge glass protector.

4. Remove the old glass, gaskets, brass washers, and brass nuts. Be sure threads on the

gauge valves are clean.

5. Install brass nuts, brass washers, and gaskets on each end of the gauge glass.

6. Insert glass tube into top gauge valve and lower the glass tube into the bottom gauge

valve which contains a seat. Then raise glass 1/16". Do not allow glass to rest directly

on the valve.

7. Hand tighten the lower glass nut and then the upper nut. While tightening these nuts,

be sure to keep the red line opposite the viewing side.

8. With a wrench, snug up the bottom nut and then the top nut.

9. Replace gauge glass protector.

10. Open gauge glass valves fully. Failure to completely open the gauge glass valves

renders the ball check safety feature inoperative.

11. Without pressure on boiler and with gauge valves closed, snug up the bottom nut and

then the top nut with a wrench, after 1 day of operation.

Blowdown

Perform blowdown procedures on boilers that require make-up water such as steam boilers. Hot

water and indirect hot water heaters (CWH-Series) are closed loop systems that recirculate the same

water. These boilers should require minimal make-up water.

Blowing down the boiler is done to remove excess total dissolved solids. The actual amount of blow-

down should be determined through boiler water analysis, done by a water treatment specialist. Until

an analysis of your boiler water is made, the following guidelines should be used.

Blow down the boiler after firing equipment has been shut down for the evening. Allow boiler water

to settle for approximately 10 minutes. Then open blowdown valve at a pressure between 5 and 10

psi for 30 seconds then close. Use this same procedure with the low water cut off blowdown ball

valve. Then go back to the boiler blowdown valve, open and close the valve, very fast, two more

times. Repeat this procedure with the low water cut off valve. This will rid the boiler of most precip-

itated sediment. DO NOT EMPTY THE BOILER OF ALL ITS WATER.