Try to keep the measuring hose at with
the inner wall of the pipe. Use a small
opening to insure you are measuring
static pressure and not velocity pressure
P (1, 2, 3) A
These will be negative pressures relative to atmosphere
P (1, 2, 3) F
These will be positive pressures relative to atmosphere
Example
P1A = -0.32” wc
P1F = 0.4” wc
Then the total pressure drop is:
∆P total = -(P1A) + P1F = -0.32 + 0.4 = 0.72” wc
Calculations are done with:
• All boilers at high re
• Water temperature 160/180ºF (gives the hottest ue gasses)
• All readings must be taken with boiler front cover installed
Doing the measurements under these conditions will give the most accurate results. There may be minor differences between appliances.
Use of a static pressure
tip for measurement is
also recommended
49
PART 8. MAINTENANCE
• A pH test must be performed at the exit point of the condensate neutralizer with litmus paper to test for
acidity. pH level should be within 6.6–7.0. If the pH is less than 6.6, replace neutralizing medium.
• Checking the minimum and maximum settings on the display must be performed as a final check.
• All findings and concerns should be discussed with the appliance owner after the inspection is complete.
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