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Part number 550-110-260/0200
27
Boiler Manual
Determine if water treatment is needed
Do not use petroleum-based cleaning or sealing
compounds in boiler system. Severe damage to boiler
will occur, resulting in substantial property damage.
Eliminate all system leaks. Continual fresh makeup
water will reduce boiler life. Minerals can build up in
sections, reducing heat transfer, overheating cast iron,
and causing section failure.
Start-up — preparation7a
Fill the system with water
1. Close manual and automatic air vents and boiler
drain cock.
2. Fill to correct system pressure. Correct pressure
will vary with each application. Typical cold water
fill pressure for a residential system is 12 psi.
3.
Purge air from system:
a. Connect a hose to the purge valve (see drain
valves, item
6, in suggested piping diagrams
on pages 17 through 21, Figure 6 through
Figure 11). Route hose to an area where water
can drain and be seen.
b. Close the boiler or system isolation valve
between the purge valve and fill connection to
the system.
c. Close zone isolation valves.
d. Open quick-fill valve on cold water makeup
line.
e. Open purge valve.
f. One zone at a time, open the isolation valves.
Allow water to run through the zone, pushing
out the air. Run until no noticeable air flow is
present. Close the zone isolation valves and
proceed with the next zone. Follow this
procedure until all zones are purged.
g. Close the quick-fill water valve and purge valve
and remove the hose. Open all isolation valves.
Watch that system pressure rises to correct
cold-fill pressure.
h. After the system has operated for a while,
eliminate any residual air by using the manual
air vents located throughout the system.
i. If purge valves are not installed in system, open
manual air vents in system one at a time,
beginning with lowest floor. Close vent when
water squirts out. Repeat with remaining vents.
4. Open
automatic air vent (diaphragm-type or
bladder-type expansion tank systems only) one
turn.
5. Open other vents:
a. Starting on the lowest floor, open air vents one
at a time until water squirts out.
b. Repeat with remaining vents.
6. Refill to correct pressure.
Verify water chemistry
Consult local water treatment companies for unusually
hard water areas (above 7 grains hardness) or low pH
water conditions (below 7.0). Boiler water pH of 7.0
to 8.5 is recommended.
Freeze protection (when used)
Use antifreeze made especially for hydronic systems.
Inhibited propylene glycol is recommended.
Do not use ethylene glycol,
automotive or undiluted
antifreeze
. Severe personal injury
or death can result.
1. Determine
antifreeze quantity according to system
water content. Boiler water content is listed on
page 59. Remember to include expansion tank water
content.
2. Follow antifreeze manufacturer's instructions.
3. A 50% solution of propylene glycol/water provides
maximum protection to about -30 °F.
4. Local codes may require back flow preventer or
actual disconnect from city water supply.
5. When using antifreeze in a system with automatic
fill, install a water meter to monitor water makeup.
Glycol will leak before the water begins to leak,
causing glycol level to drop. Added water will dilute
the antifreeze, reducing the freeze protection level.
Check for gas leaks
Before starting the boiler, and during initial operation,
smell near the floor and around the boiler for gas
odorant or any unusual odor. Do not proceed with
start-up if there is any indication of a gas leak. Repair
any leak at once.
Propane boilers only — Your propane supplier mixes
an odorant with the propane to make its presence
detectable. In some instances, the odorant can fade, and
the gas may no longer have an odor. Before start-up
(and periodically thereafter), have the propane supplier
verify the correct odorant level in the gas.