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Figure 78
Pressure switch tube locations
SVF
™
Series 1
Commercial Condensing Gas-Fired Water Boiler
— Boiler Manual
Part number 550-100-250/0819
87
Startup — fi nal checks
Check thermostat circuit(s)
1. Disconnect the two external wires connected to the boiler
thermostat terminals (see instructions beginning on page 59
for terminal locations).
2. Connect a voltmeter across these two incoming wires. Close
each thermostat, zone valve and relay in the external circuit one
at a time and check the voltmeter reading across the incoming
wires.
Th
ere should NEVER be a voltage reading. Applying
voltage across the thermostat terminals will damage
the control. If a voltage does occur under any condi-
tion, check and correct the external wiring. (Th
is is a
common problem when using 3-wire zone valves.)
3. Once the external thermostat circuit wiring is checked and
corrected if necessary, reconnect the external thermostat circuit
wires. Allow the boiler to cycle.
Inspect/fi ll condensate system
Inspect/check condensate lines and fi ttings
1. Inspect the condensate drain line and condensate trap. (See
page 46 for component locations.)
Fill condensate trap with water
1. Fill the condensate trap with fresh water by removing, fi lling
and re-installing onto heat exchanger condensate drain.
2.
4OREMOVETHETRAP
, see page 46 for information.
Th
e condensate trap must have check fl oat in place
and be fi lled with water during all times of boiler
operation to avoid fl ue gas emission from the con-
densate drain line. Failure to fi ll the trap could result
in severe personal injury or death.
Inspect pressure switch hoses
Th
e pressure switch sense lines must be in good con-
dition and fi rmly att ached to the correct locations.
Incorrect placement or disconnected sense lines can
result in unreliable boiler operation.
1. Inspect all pressure switch sense hoses and verify that they are
correctly installed ( Figure 78 ). Replace if necessary.
2. Inspect and verify att achment of the plastic gas valve/venturi
reference line ( Figure 87, page 96 ). Replace if necessary.
Final checks before starting boiler
❏
Read the instructions to adjust and set up the control module.
Verify that all sett ings have been made correctly.
❏
Verify that the boiler and system are full of water and all system
components are correctly set for operation.
❏
Vent any remaining air from system using manual vents. Air in
the system will interfere with circulation and cause heat distri-
bution problems and noise. Check system piping for leaks. If
found, shut down boiler and repair immediately.
Eliminate all system leaks
. Continual fresh make -
up water will reduce boiler life. Minerals can build up
in sections, reducing heat transfer, overheating heat
exchanger, and causing heat exchanger failure.
❏
Fill condensate trap with water (see above for procedure).
❏
Verify electrical connections are correct and securely att ached.
❏
Inspect vent piping and air piping (direct vent systems) for signs of
deterioration from corrosion, physical damage or sagging. Verify vent
piping and air piping are intact and correctly installed per this manual.
Venting system must be sealed gas-tight to prevent fl ue gas
spillage and carbon monoxide emissions which will result
in severe personal injury or death.
Before starting the boiler, and during initial operation, use
a leak detector or smell near the fl oor and around the boiler
for gas odorant or any unusual odor. Remove boiler access
door and smell interior of boiler enclosure. Do not proceed
with startup if there is any indication of a gas leak. Repair
any leak at once.
If you discover evidence of any gas leak during operation,
shut down the boiler at once. Find the leak source with
bubble test and repair immediately. Do not start boiler
again until corrected. Failure to comply could result in se-
vere personal injury, death or substantial property damage.
Flue
Pressure switch
Air Filter
Indicator
BLUE hose goes
from gas valve to
Air Filter Indicator
BLUE hose goes
from gas valve
to shroud
BLACK hose goes from
Flue Pressure switch to hose
barb on condensate dish.