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23
TROUBLESHOOTING GUIDE
StartUpConditions
ThermalExpansion








of heated water.

increases the pressure of the water system. If the relieving point

the valve will relieve the excess pressure. Thetemperature-
pressurereliefvalveisnotintendedfortheconstantrelief
ofthermalexpansion. This is an unacceptable condition and
must be corrected.
It is recommended that any devices installed which could create
a closed system have a by-pass and/or the system have an


stores and through the Sears Service Centers. Contact the local


26 and Figure 26 A.
FIGURE 26.
FIGURE 26A.
ThermalExpansionTankSpecications
TankDimensions Pipe
Model Capacity
inInches Fitting
Number InGallons Diameter Length OnTank
    
TABLE 1.
NOTE:Expansiontanksarepre-chargedwitha40psiair
charge.Iftheinletwaterpressureishigherthan40psi,the
expansiontank’sairpressuremustbeadjustedtomatch
thatpressure,butmustnotbehigherthan80psi.
StrangeSounds
Possible noises due to expansion and contraction of some metal
parts during periods of heat-up and cool-down do not represent
harmful or dangerous conditions.
Condensation causes sizzling and popping within the burner area
during heating and cooling periods and should be considered
normal. See Condensation section.
DraftHoodOperation
 
depressurization of the building. With all doors and windows





necessary air supply changes to correct.
Condensation

condensate will form while the burner is on. A water heater may

