CLEAN BURN CB 140, Operator'S Manual

Page: 70 / 142

Operator's Manual: Models CB-1750, CB-2500 & CB-3250
5-4
Vacuum Testing the Oil Pump
Vacuum testing the oil pump is a very accurate way to determine the following:
• The condition of the pump -- the ability of the pump to pull a vacuum and suck oil from the tank.
• The condition of the fittings, gaskets and seals from the ball valve to the pump -- these
components must all be airtight to avoid suction leaks.
The following procedure provides instructions for vacuum testing the pump and canister filter on
systems equipped with a ball valve.
ATTENTION: For the pump to pull and hold vacuum, it is critical that all fittings are airtight. If any of these
fittings are loose, the pump may not pull a vacuum or may lose the vacuum rapidly. It is also critical that all
fittings in the suction line, including fittings on the canister filter, are 100% airtight.
1. Follow the instructions to prime the pump (previous procedure).
NOTE: The pump will not pull a vacuum if the pump is dry. There must be oil in the gears of
the pump before the pump can pull a vacuum.
2. With the pump running, open the bleeder two to three full turns, and make sure that oil is flowing
from the bleeder. DO NOT close the bleeder yet.
3. Refer to Figure 5A. Close the ball valve at the inlet to the canister filter. Observe the vacuum gauge.
NOTE: The ball valve must have a stainless steel ball and should be pressure tested by the
manufacturer to ensure that it does not leak. If the ball valve leaks, the vacuum test will not be
accurate.
4. The vacuum should increase within 30 seconds to 15 inches of vacuum. When the vacuum gauge reads
15 inches of vacuum, first close and tighten the bleeder, then turn the pump off and close the mini ball
valve at the outlet port of the pump. Observe the vacuum gauge.
NOTE:
If the pump will not pull at least 15 inches of vacuum, there is a very serious suction leak, or
the pump is damaged. Vacuum Testing the Oil Pump (continued)
9. Run the pump until a solid stream of oil flows from the pump bleeder. This will bleed all air out
of the suction line, oil filter and pump head.
ATTENTION: For the metering pump to operate correctly, it is very important that the system
is entirely full of oil and all air is bled out. The burner will shut down if there is any air in the
system.
10. Open the mini ball valve at the outlet port of the pump head to allow the pressure oil line to be filled.
11. Close and tighten the bleeder on the pump.
12. Turn the priming switch to the burner (DOWN) position so that the pump stops running.
13. Disconnect the pressure oil line from the burner and position a container to catch oil which will flow
from the pressure oil line during pump priming.
14. Turn the priming switch to the prime (UP) position. The pump should start running immediately .
15. Run the oil pump until the proper flow of oil has been established, and the oil line has been completely
flushed out.
16. Turn the priming switch to the burner (DOWN) position so that the pump stops running.
17. Re-connect the oil line to the burner.