Columbia CT Series, Installation, Operation And Maintenance Manual

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FM-148 COLUMBIA BOILER COMPANY, REV 6-06
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TESTING OF BOILER COMPONENTS
Refer to Boiler Check & Maintenance Lists earlier in this section for frequency of testing.
Warrick Series DF Low Water Cut-Off and Pump Control
Testing while operating . (Red LED ON indicates normal operating condition.)
1. Fill the boiler to a level higher than the normal operating water level.
2. With the burner running, lower the water level in the boiler by using the bottom
blow down valve. At about the normal boiler water level the pump should come
on and start pumping water into the boiler.
3. When the water level drops approximately 1-1/2 inches below the level at
which the pump turned on, the burner should turn off and the alarm circuit will
close, and activate the optional alarm bell (if so equipped).
Testing while not in operation.
1. Fill the boiler to a level high than the normal operating water level.
2. Open the Panel Box and locate the terminal blocks; TB1 is the upper block, TB2
is the lower block.
3. Using an AC Continuity Tester, Check for continuity between terminal “PH” and
Ground , indicating the high Water probe circuit is functioning properly.
4. Check for continuity between terminals TB1-A2 and TB2-3 , indicating the burn-
er circuit is making, and the burner would be operating.
5. Terminals TB2-M and TB2-M2 should be open, indicating the pump circuit is not
energized.
6. Open the bottom blow down valve and allow the water level to drop below the
normal operating water level.
7. Check for continuity between terminals TB1-A2 and TB2-3 , indicating the burn-
er circuit is making, and the burner would be operating.
8. continuity across Terminals TB2-M1 and TB2-M2 signifies the boiler feed pump
circuit is energized, causing the pump to operate.
9. Open the bottom blow down valve and allow the water level to drop below the
Low probe level. Check for continuity between terminals TB1-A2 and TB2-3 .