Boiler Manual
Part Number 550-110-593/1099 47
❏ Start-up . . . . . . . . .
1. Perform start-up procedures section 6, pages 28-32,
including procedure to verify operation of burners
and vent damper on page 32.
2. Verify cold fill pressure is correct and that fill system
is working properly.
3. Verify antifreeze level (if used) is at the right
concentration and that inhibitor level is correct.
4. Check gas piping, per manual sections 4 and 6,
verifying no indications of leakage and all piping
and connections are in good condition.
5. Read the Lighting or Operating instructions
(manual section 8 or 9) applying to the boiler.
6. Start the boiler following the Lighting or Operating
instructions (manual section 8 or 9).
❏ Check/test . . . . . . .
Gas piping
1. Sniff near floor and around boiler area for any
indication of a gas leak.
2. Test gas piping using bubble test, per section 4,
page 26 of this manual, if there is any indication of
a leak.
Cold fill and operating pressures
1. While the system is cold, note the pressure reading
on the boiler pressure/temperature gauge. Verify that
cold fill pressure is correct.
2. Watch the pressure as the boiler and system heat
up to ensure pressure rise is normal. Too high a rise
would indicate a waterlogged or undersized
expansion tank.
Air vents and air elimination
1. Inspect automatic air vents (if used). Also inspect
air separators to ensure they are operational.
2. The cap must be unscrewed one turn to allow air to
escape.
3. See Figure 26. If the air vent is leaking, remove cap
Aand briefly push valve Band then release to clean
the valve seat.
4. Replace cap Aby twisting all the way onto valve B
and then unscrewing one turn.
Limit controls and cutoffs
1. Inspect and test the boiler limit control. Verify
operation by turning control set point below boiler
temperature. Boiler should cycle off. Return dial to
original setting.
2. Inspect and test additional limit controls or low
water cutoffs installed on system.
Figure 26 Automatic air vent, typical
59342
A
B
Expansion tank
1. Expansion tanks provide space for water to move in
an out as the heating system water expands due to
temperature increase or contracts as the water cools.
Tanks may be open, closed or diaphragm or bladder
type. See section 3, page 16 of this manual for
suggested best location of expansion tanks and air
eliminators.
Open-type — located above highest radiator or
baseboard unit, usually in the attic or closet. Has a
gauge glass and overflow pipe to a drain.
Closed-type— welded gas tight and located above
boiler. Tank is partially filled with water, leaving an
air cushion for expansion.
• Make sure this type of tank is fitted with a tank
fitting, such as the B & G Tank-Trol or Taco
Taco-Trol. This fitting reduces gravity