RBI 8800 series Installation And Operation Instructions Manual page 28

Page 28
PROBLEM
Boiler Pounds or Knocks
Relief Valve Leaks
Sooting of Heat Exchanger
SERIES 8800 & 8900 INSTALLATION AND OPERATING INSTRUCTIONS
POSSIBLE CAUSES
Low or no water flow
Low or no system pressure
Heat exchanger blocked
System pressure too high
Expansion tank is waterlogged
Expansion tank is isolated
Return water temperature to low
Inadequate combustion air
Rated input has been exceeded
Incorrect fuel type
Trouble-Shooting
CORRECTIVE ACTION
Ensure that pump is operating
properly - look for voltage through
flow switch.
Ensure that all system valves are
open.
Ensure that all air has been bled
from the system.
Ensure that maximum temperature
rise of 35°F, 19°C has not been
exceeded.
Ensure that water makeup valve is
open and functioning.
Remove return header and inspect
the heat exchanger tubes.
Ensure relief valve is properly sized
for the system - never exceed
160 psi.
Ensure expansion tank is properly
sized for the system.
Ensure valve between expansion
tank and system is open.
Adjust balancing valves for a
minimum return water temperature
of 110°F, 43 °C.
Ensure that the make up air supply
is adequate per NFPA 54/ANSI
Z223.
Ensure that the vent system is sized
properly, is not blocked or restricted
and that there is adequate draft
present in the breeching.
Ensure that the input rate is correct.
Ensure that the fuel type supplied
matches the rating plate.