Instructions

PRESTIGE Solo 175 & 250
Service Parts Instructions
5
Check Expansion Tank
Closed -Type Tank:
1. Ensure tank is partially filled with water leaving
an air gap as a cushion. Refer to the manufac-
turer’s instruction for proper fill level.
2. Ensure the tank is fitted with a device that
reduces gravity circulation of air-saturated tank
water back into the system. This device pre-
vents air from bubbling up through the water as
it returns from the system.
3. Ensure no automatic air vents are used in the
system. This will allow air to escape from the
system instead of returning to the tank.
Diaphragm Tank:
1. Ensure the system contains a minimum of one
automatic air vent. Recommended location of the
air vent should be atop an air eliminator.
2. Remove the tank from the system and check the
charge pressure. For residential applications the
charge pressure is typically 12 psig. If tank
does not hold a charge pressure, then the mem-
brane is damaged and the tank should be
replaced.
Check Boiler Relief Valve
1. Inspect the relief valve and lift the lever to ver-
ify flow at least annually or as recommended on
the warning tag of the valve.
Before manually operating the pressure relief
valve, ensure the discharge piping is directed to
a suitable place of disposal to avoid a potential
scald hazard. The discharge piping must be full
size without restriction and installed to permit
complete drainage of both the valve and line.
2. If after closing the valve, the valve fails to seat
properly or continually weeps, replace the relief
valve. Ensure the cause of the relief valve to
weep is the valve itself, not due to system over-
pressurization caused by an expansion tank that
is waterlogged or undersized.
Inspection of Sight Glass
1. Visually inspect sight glass and gasket for signs
of deterioration.
2. Replace sight glass if necessary.
Inspection of Igniter
1. Remove the igniter from the burner mounting
plate.
2. Verify igniter gap is within specifications
shown below.
3. Remove any white oxides accumulated on the
electrode using fine grit sandpaper or steel wool.
If the electrode does not clean to a satisfactory
condition, replace the igniter .
4. When replacing the igniter, ensure the gasket is
in good condition and correctly positioned.
Replace gasket if necessary.
5. Tighten igniter screws evenly. See Table 1, page
14 for torque specifications.
WARNING
MCBA: 3/16” to 9/32”
Fig. 4: Recommended Igniter Gap