Weil-McLain 2 Series Manual page 81

®
SlimFit Series 2
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 47 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 cor-
rected 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 44 for component locations.)
Fill condensate trap with water
1. Fill the condensate trap with fresh water, either by removing, fi ll-
ing and re-installing or by pouring water into the inspection caps
near the fl ue connection (piping end of boiler).
2. , see page 44 for information.
a. Loosen the two stainless steel hose clamps on the fl exible
coupling
b. Slide the fl exible coupling over the 1" PVC pipe connected
to the trap.
c. Loosen the condensate trap inlet connection.
d. Remove condensate trap and fl ush as needed.
Th e condensate trap must be fi lled with water during
all times of boiler operation to avoid fl ue gas emission
from the condensate 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 73 ). Replace if necessary.
2. Inspect and verify att achment of the plastic gas valve/venturi
reference line ( Figure 81, page 90 ). 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.
Part number 550-100-180/0917
COMMERCIAL CONDENSING GAS
- — Boiler Manual
FIRED WATER BOILER
Pressure switches
WHITE hose
to blower housing
BLACK hose to burner end sec-
tion lower center hose barb
WHITE hose to hose barb on
the side of the venturi
❏ 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 distribution
problems and noise.
❏ Check system piping for leaks. If found, shut down boiler and
repair immediately.
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 opera-
tion, 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 severe personal injury, death or substantial
property damage.
Y-fi tting with WHITE
hoses to top of switches
Min air
fl ow switch
Flue pressure
switch
. Continual fresh make -
81