Weil-McLain WM97+70 Specifications download pdf (Page 90)

Part number 550-142-120/0113

WM97+ gas-fired water boiler — Boiler Manual

– 90 –

Startup — ﬁnal checks (continued)

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 99, page 91.

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 102.

 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 87 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.

 Check gas piping

1. Check around the boiler and inside the boiler jacket for gas

odor following the procedure of page 63 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 89, page 79. 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 93, page 83) 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.

Insert combustion analyzer probe — Remove the ﬂue

temperature sensor from the ﬂue pipe and insert a combus-

tion test probe.

6. Test for CO

(or O

) and for CO. The CO

values must comply

with Figure 101, page 93. If results are acceptable, proceed to

step 7. IF NOT, follow the instructions under “Throttle Screw

Adjustment” on page 92 or page 93 to set the throttle screw

position. See WARNING on page 92 upper left.

CONTINUED AFTER NEXT PAGE

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Weil-McLain WM97+70 Specifications Page 90

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