Weil-McLain WM97+70 Manual page 88

WM97+ -
gas fired water boiler
Startup — final checks
Final checks before starting boiler
Read the instructions to adjust and set up the WM97+
❏ ❏
control.
❏ ❏ Verify that the boiler model is set correctly in the WM97+
control, and that it displays correctly.
Verify that the boiler and system are full of water and all
❏ ❏
system components are correctly set for operation.
❏ ❏ Verify that condensate trap is filled with water.
❏ ❏ Verify electrical connections are correct and securely at-
tached.
Inspect vent piping and air piping for signs of deteriora-
❏ ❏
tion from corrosion, physical damage or sagging. Verify air
piping and vent piping are intact and correctly installed per
this manual.
To start the boiler
1. Turn OFF the boiler ON/OFF switch.
2. Follow the Operating Instructions, Figure 95, page 89.
3. The WM97+ control display will show installed sensors when
first powered. Make sure the right sensors are detected and
the correct boiler model is identified. If not, determine the
cause and correct before proceeding.
If boiler does not start correctly
1. Check for loose connections, blown fuse or service switch off?
2. Are external limit controls (if used) open? Is boiler water
temperature above 200 °F?
3. Are thermostats set below room temperature?
4. Is gas turned on at meter and boiler?
5. Is incoming gas pressure less than the minimum values given
on page 18?
6. Are WM97+ control settings correct for the application?
7. Is the warm weather shutdown activated?
8. If none of the above corrects the problem, refer to Trouble-
shooting, beginning on page 100.
Check system and boiler
❏
❏
Check water piping
1. Check system piping for leaks. If found, shut down boiler and
repair immediately. (See WARNING on page 85 regarding
failure to repair leaks.)
2. 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 vent piping and air piping
1. Check for gas-tight seal at every connection and seam of air
piping and vent piping.
Venting system must be sealed gas-tight to prevent
flue gas spillage and carbon monoxide emissions
which will result in severe personal injury or death.
– 88 –
— Boiler Manual
(continued)
❏
Check gas piping
1. Check around the boiler and inside the boiler jacket for gas
odor following the procedure of page 61 of this manual.
If you discover evidence of any gas leak, 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 re-
sult in severe personal injury, death or substantial
property damage.
❏
Propane boilers — verify conversion
1. Verify boiler has been converted for propane. See page 14 for
WM97+70 or 110 or page 16 for WM97+155.
DO NOT attempt to mea-
sure gas valve outlet pres-
sure
DO NOT adjust or attempt to measure gas valve outlet
pressure. The gas valve is factory-set for the correct outlet
pressure. This setting is suitable for natural gas and propane,
requiring no field adjustment.
Attempting to alter or measure the gas valve outlet pressure
could result in damage to the valve, causing potential severe
personal injury, death or substantial property damage.
WM97+ boilers are shipped ready to fire natural gas ONLY.
Failure to comply could result in severe personal injury,
death or substantial property damage.
❏
Check flame & combustion with instruments
1. Initiate a call for heat on one of the thermostat inputs.
2. Access the WM97+ control installer menus by pressing and
holding the UP and DOWN arrow keys for seven seconds.
3. See Figure 85, page 77. Make sure the Max firing rate is set to
the maximum given in the table. If not, adjust as necessary.
Then navigate to DIAGNOSTICS — Manual test mode (see
Figure 89, page 81) and force the firing rate to MAX (high
fire).
4. Look at the flame through the flame inspection window.
The high fire flame should be blue and should be stable. The
burner surface should be covered with orange dots.
5.
Insert combustion analyzer probe
temperature sensor from the flue pipe and insert a combus-
tion test probe.
6. Test for CO (or O
2
with Figure 97, page 91. If results are acceptable, proceed to
step 7.
IF NOT
Adjustment" on page 90 or page 91 to set the throttle screw
position. See
CONTINUED AFTER NEXT PAGE
— Remove the flue
) and for CO. The CO values must comply
2 2
, follow the instructions under "Throttle Screw
on page 90 upper left.
WARNING
Part number 550-142-085/0712