Weil-McLain WM97+100 Manual page 115

WM97+ Series 2
Maintenance
Cleaning the heat exchanger WATER
SIDE, when required
1. Isolate the boiler from the heating system.
2. Obtain Sentinel X400 cleaner from Weil-McLain. Follow instruc-
tions supplied with the cleaner to clean the boiler heat exchanger.
Use ONLY the cleaning product available from Weil-
McLain, Sentinel X400. See the Repair Parts section at
the end of this manual for ordering information.
Using other cleaning materials or methods could cause
permanent damage to the boiler heat exchanger.
Inspect the heating system water. If there is evidence of
sediment or corrosion, the boiler must be isolated from
the system. The system must then be thoroughly cleaned
to remove all sediment.
Isolated the cause of the system corrosion and correct
the problem(s) before placing the boiler back in service.
Failure to comply could result in severe personal injury,
death or substantial property damage.
Checking the heat exchanger-to-
condensate dish seal
1. Remove the front door and rotate the control housing assembly
forward as shown in Figure 115 so it will be out of the way or
disconnect the wire harnesses and place the control aside in a safe
location.
2. Place a container under the boiler for drainage.
3. Disconnect the fl exible condensate drain tube from the condensate
drain piping so it's outlet end is free to move.
4. Loosen the condensate trap upper ferrule (see Figure 115) and
rotate the trap assembly so the fl exible drain tube can be lifted as
shown. Tighten the upper ferrule when in position.
The boiler is shipped with a 24-inch fl exible tube. If the
tube has been cut shorter, attach a ¾" PVC coupling to
the fl exible tube with tape. Then use a length of ¾" PVC
pipe long enough to locate the funnel as directed.
5. Insert a funnel into the open end of the fl exible tube. Wrap the
funnel-to-tube joint with tape so it will be watertight.
6. Lift the funnel up as shown in Figure 115 so it is from 6 to 10 inches
above the bottom of the boiler.
7. Pour one gallon of water (no more than one gallon) slowly into
the funnel. Use tape or cord to secure the funnel and fl exible tube
up in position so the funnel remains 6 to 10 inches above the bot-
tom of the boiler.
8. Use a fl ashlight and mirror to inspect around the perimeter of the
heat exchanger where it joins the condensate dish (see Figure 116
for a WM97+70 or 110 or Figure 117 for WM97+155).
9. There must be no signs of water leakage anywhere around the heat
exchanger-to-condensate dish joint.
If there are signs of leakage, wipe the area with a clean
rag to ensure there is a leak and not just splashed water. If
the leak continues, the boiler must not be operated until
a new sealing ring is obtained. Follow the instructions
supplied with the sealing ring kit to disassemble boiler
components as necessary to access and replace the seal.
10. If there are no indications of leakage, the seal is acceptable.
11. Remove the funnel, drain the water into the container below,
return the condensate trap assembly to its original position, and
re-connect the fl exible drain tube to the condensate drain tubing.
Part number 550-142-204/0117
-
GAS FIRED WATER BOILER
(continued)
— Boiler Manual
Figure 119
Adding water to exchanger for
condensate dish seal check
Funnel Funnel
Flexible condensate
drain tube drain tube
Condensate bracket not shown
Figure 120 I nspect the heat exchanger-to-
condensate dish joints — 70/110
Figure 121
Inspect the heat exchanger-to-
condensate dish joints — 155
Control housing Control housing
Upper ferrule Upper ferrule Upper ferrule
Inspect joints
Inspect joints
– 115 –