GSA
Gas-Fired Steam Boilers –
Boiler Manual
7
Part Number 550-110-738/0703
2
Prepare boiler
continued
Pressure test
continued
Draft diverter & spill switch
Draft diverter installation
1. Secure draft diverter to flue collector hood with sheet metal
screws. See Figure 16, items 1 and 9, on page 26. Use boiler
cement to provide gas tight seal.
Failure to maintain gas-tight seal can cause flue gas
spillage and carbon monoxide emissions, resulting
in severe personal injury or death.
Do not alter boiler draft diverter or place any
obstruction or non-approved vent damper in
breeching or vent system. CSA certification will
become void. Flue gas spillage and carbon monoxide
emissions will occur causing severe personal injury
or death.
Spill switch installation
1. Fasten spill switch to draft diverter as shown in Figure 16, item
20, page 26.
2. See Wiring diagram on page 17 to connect wires.
Install vent piping
1. Connect from draft diverter or vent damper outlet to chimney or
vent with same size vent connector.
2. Where possible, vertical venting to the outside from the draft
diverter or vent damper outlet will offer best performance.
3. Where horizontal vent connector is used, slope upward at least
¼" per lineal foot toward chimney or vent and support with
hangers to prevent sagging.
4. Breeching must not be connected to any portion of a mechanical
draft system that can operate under positive pressure.
Long horizontal vent connector, excessive number
of elbow or tees, or other obstructions that restrict
the flow of combustion gases should be avoided.
Severe personal injury, death or substantial property
damage could result.
Drain and remove fittings
1. Drain boiler and repair leaks if found.
Leaks must be repaired at once. Failure to do so can
damage boiler, resulting in substantial property
damage.
Do not use petroleum based cleaning or sealing
compounds in boiler system. Severe damage to boiler
will result, causing substantial property damage.
2. Retest boiler after repairing leaks.
3. Remove plugs from any tappings that will be used for controls
and accessories. Refer to Table 4 and Figure 3, below.
Table 4
Control tapping
Figure 3
Control tapping locations
Float-type low water cutoff — If field installing a float-
type low water cutoff, it must be piped only to the
gauge glass tappings, items H, Figure 3. The tappings
are spaced 9" on center. Use only float-type low water
cutoffs with quick-connect hookups that will provide
a low water cutoff point no higher than 2" above the
center of the bottom tapping. See page 11, Figure 9,
for a typical installation.