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Boiler Components
Tankless Water Heater (EG and PEG only)
If boiler is used to supply domestic hot water, limit
control should be set to supply adequate hot water.
Weil-McLain tankless heaters are rated at 200°F
boiler water temperature. To get rated output, set low
limit at 200°F.
Limit can be adjusted to meet system hot water
requirements. Dierential can be set to 15° and
adjusted to control level. Lowering the dierential will
cause a slight variation in water temperature but will
decrease burner on-o cycling. High limit should be
set at least 20° above low limit.
Rollout Thermal Fuse Element (CGa, CGi, EG,
& PEG only)
Cuts o gas ow should ame roll-out occur. See
Figure 2.
!
Do not attempt to place boiler in operation if
rollout thermal fuse element cuts o gas ow.
Immediately call a service technician. Failure to
do so can cause severe personal injury, death or
substantial property damage.
Spill Switch (CGa, EG, & PEG only)
Cuts o gas ow should vent system become
blocked. See Figure 3.
!
Do not attempt to place boiler in operation if
spill switch cuts o gas ow. Immediately call a
service technician. Failure to do so can cause
severe personal injury, death or substantial
property damage.
Pressure Switch (LGB only)
Cuts o gas ow should vent system become
blocked. See Figure 4.
After resolving the fault, reset the control: press
Enter (square symbol), and use the arrow keys to
select YES. The fault will be reset, and the error
screen should revert to default display. If fault re-
occurs, contact a service technician.
Draft - For Engineering Review ONLY Jan. 2023 HC
Figure 2 Rollout thermal fuse element
Figure 3 Spill switch
Figure 4 Pressure switch
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