Adjustment Procedures
6-22
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
is recommended that the oil system be inspected from time to time to verify that pressures and viscosity are at the
proper operating levels.
Because of variation in oils, including chemical content, source, blends, and viscosity characteristics, the tempera-
tures and pressures listed in Chapter 5, and mentioned in the adjusting of the controls in the subsequent para-
graphs, will vary and thus may be regarded as tentative and to be changed to provide best firing conditions. The oil
viscosity chart (Figure 6-17) may be used as a guide, although your oil supplier will be able to give you more exact
information based on an analysis of the oil.
FIGURE 6-17. Oil Viscosity Chart
Review of the applicable maintenance instructions given in Chapter 8 will aid in maintaining an efficient fuel sys-
tem.
When the boiler is shut down, or switched over to gas firing, the pump must operate for a sufficient period of time
to cool the oil heater. Similarly, if an electric, steam, or hot water oil heater is removed for servicing, the tempera-
ture of the heater should be reduced by circulating oil until it has cooled.
NOTE: To prevent oil heater coking, the fuel oil pump must be in operation during all times that an oil heater is in
service. During any time that the oil pump is not operating, the oil heating system must be electrically shut down by
manually turning the oil heater switch to the “off ” position.
To Next Page
Loading...
