To Shut Down The Boiler - Weil-McLain SlimFit 550 User's Information Manual

SlimFit -
™
gas fired water boiler
Maintenance procedures — END OF SEASON
Part number 550-100-088/0814
— User's Information Manual
To continue operation for DHW
1. If the boiler is to supply heat for domestic hot water generation during the summer, no
changes should be needed. Just leave the boiler power on and allow the DHW storage tank
to call for heat as necessary.
2. Set back room thermostats to prevent any unnecessary call for heat during the off season.
To leave boiler in stand-by mode
1. The SlimFit boiler's U-Control provides effective features for stand-by operation, includ-
ing periodic exercising of the boiler and system circulators and automatic operation of
the boiler at low fire if water temperatures drop too close to freezing. Just configure the
U-Control as needed to operate the necessary circulators.
2. Leave the boiler power on and allow the U-Control to monitor the boiler and system dur-
ing the stand-by period.
The U-Control must be configured to operate all circulators needed to ensure
the system and all circuits will be protected against freezing. See the SlimFit
Commercial Boiler manual for details.
3. Set back room thermostats to prevent any unnecessary call for heat during the off season.

To shut down the boiler

1. Follow "TO TURN OFF GAS TO APPLIANCE" of the Operating Instructions, Fig-
ure 1, page 4.
2. DO NOT drain the system unless exposure to freezing temperatures will occur.
3. DO NOT drain the system if it is filled with an antifreeze solution.
4. DO NOT shut down boilers used for domestic water heating. They must operate year-round.
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