Weil-McLain SVF 1500 Manual page 95

SVF
™
Series 1
Commercial Condensing Gas-Fired Water Boiler — Boiler Manual
Annual startup
Following installation, the valve lever must be operated
AT LEAST ONCE A YEAR
clear. Certain naturally occurring mineral deposits may adhere
to the valve, rendering it inoperative. When manually operating
the lever, water will discharge and precautions must be taken to
avoid contact with hot water and to avoid water damage. Before
operating lever, check to see that a discharge line is connected
to this valve directing the fl ow of hot water from the valve to
a proper place of disposal. Otherwise severe personal injury
may result. If no water fl ows, valve is inoperative. Shut down
boiler until a new relief valve has been installed.
Check expansion tank
1. Expansion tanks provide space for water to move in and out as the
heating system water expands due to temperature increase or con-
tracts as the water cools. Tanks may be open, closed or diaphragm
or bladder type. See section 3 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 att ic or closet. Has a gauge glass and over-
fl ow pipe to a drain.
Closed-type — welded gas tight and located above boiler.
Tank is partially fi lled with water, leaving an air cushion for
expansion.
Make sure this type of tank is fi tt ed with a tank fi tt ing, such as the
B & G Tank-Trol or Taco Taco-Trol. Th is fi tt ing reduces gravity
circulation of air-saturated tank water back to the system and
prevents the air from bubbling up through the water as it returns
from the system.
Do not use automatic air vents in systems with closed-type tanks.
Th e air will escape from the system instead of returning to the
tank. Eventually, the tank will waterlog and no longer control
pressurization. Th e boiler relief valve will weep frequently.
Diaphragm- or bladder-type
membrane to separate the tank pressurizing air and the water. May be
located at any point in the system, but most oft en found near the boiler.
Systems with this type of expansion tank require at least one
automatic air vent, preferably located on top of an air elimina-
tor, as shown in examples in this manual.
2. If relief valve has tended to weep frequently, the expansion tank
may be waterlogged or undersized.
Closed-type tank — tank is most likely waterlogged.
Install a tank fi tting if not already installed. Th en check fi ll level
per fi tt ing manufacturer's instructions. If fi ll level is correct, check
tank size against manufacturer's instructions. Replace with a larger
tank if necessary.
Diaphragm- or bladder-type — fi rst, check tank size to be
sure it is large enough for the system. If size is too small, add additional
tank (or tanks) as necessary to provide suffi cient expansion. If tank size
is large enough, remove tank from system and check charge pressure
(usually 12 psig for residential applications). If tank won't hold pres-
sure, membrane has been damaged. Replace tank.
Inspect ignition electrode / fl ame sense rod
1. Remove the ignition electrode from the boiler combustion cham-
ber. See Figure 85 .
2. Remove any white oxides accumulated on the ignition electrode
and fl ame sense rod using steel wool. If the ignition electrode
cannot be cleaned satisfactorily, replace ignitor with a new one.
3. Flame sense rod is longer than the ignition electrode.
4. Replace gasket if necessary.
5. Reinstall ignition electrode, making sure gasket is in good condi-
tion and correctly positioned.
6. Make sure the ignition electrode ground wire is att ached to spade
connection.
Part number 550-100-250/0819
(continued)
to ensure that waterways are
—
welded gas tight with a rubber
7. Inspect the fl ame sense rod harness and connections. Replace if
necessary.
SVF 1500/2000 – Male spade for fl ame sense.
SVF 2500/3000 – Female spade for fl ame sense.
Failure to use the correct ignition electrode/fl ame sense
rod assembly may result in severe personal injury, death
or substantial property damage
Figure 85
Ignition electrode / fl ame sense rod –
SVF 2500/3000 shown
Ignition
electrode
Ground
rod
Figure 86
Correct orientation of ignition electrode / fl ame
sense rod sight glass in down position.
Th e ignition electrode must be sealed gas-tight to pre-
vent fl ue gas spillage and carbon monoxide emissions
which will result in severe personal injury or death.
Check ignition wiring
1. Check ignition cable electrical resistance. A good cable will have
resistance between 900 and 1000 ohms. Replace if not acceptable.
2. Inspect boiler ground wire from ignition electrode to ground
terminal strip.
3. Verify all wiring is in good condition and securely att ached.
4. Check ground continuity of wiring using continuity meter.
5. Replace ground wires if results are not satisfactory.
Flame sense
rod
95