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User's
Information Manual
If the information in this manual is not followed exactly, a fire or explosion may result,
causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any telephone in your building.
• Immediately call your gas supplier from a neighbor's telephone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
Installation & service must be performed by a qualified installer, service technician or the gas supplier.
— WHAT TO DO IF YOU SMELL GAS —
Commercial Condensing
Gas-fired water boilers
(Models 550 and 750 only)
Part number 550-100-088/0814
TM
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Summary of Contents for Weil-McLain SlimFit 550
- Page 1 Commercial Condensing Gas-fired water boilers User’s (Models 550 and 750 only) Information Manual If the information in this manual is not followed exactly, a fire or explosion may result, causing property damage, personal injury or loss of life. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. —...
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Page 2: Hazard Definitions
SlimFit — User’s Information Manual ™ fired water boiler How to use this manual . . . To . . . Read/use . . . See pages . . . Learn precautions Warnings and definitions 1 – 3 Start or shutdown the Use the OPERATING INSTRUCTIONS boiler Boiler components &... -
Page 3: Boiler Operation
SlimFit — User’s Information Manual ™ fired water boiler STOP! READ THIS BEFORE PROCEEDING . . . Failure to adhere to the guidelines on this page can result in severe personal injury, death or substantial property damage. Boiler service and maintenance — To avoid electric shock, disconnect all electrical supplies to the boiler before perform- ❏... -
Page 4: Operating Instructions
SlimFit — User’s Information Manual ™ fired water boiler OPERATING INSTRUCTIONS Figure 1 Operating instructions Part number 550-100-088/0814... -
Page 5: Boiler Components
SlimFit — User’s Information Manual ™ fired water boiler Boiler components Figure 2 SlimFit component locations Part number 550-100-088/0814... - Page 6 SlimFit — User’s Information Manual ™ fired water boiler The U-Control display Figure 3 SlimFit boiler’s U-Control display Part number 550-100-088/0814...
- Page 7 SlimFit — User’s Information Manual ™ fired water boiler Resetting the U-Control Figure 4 U-Control display turns red when boiler locks out — select MANUAL RESET to reset boiler as shown below. To reset: • Press the DOWN or RIGHT arrow. •...
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Page 8: Prevent Combustion Air Contamination
SlimFit — User’s Information Manual ™ fired water boiler Prevent combustion air contamination If the boiler combustion air inlet is located in any area likely to cause contamination, or if products which would contaminate the air cannot be removed, you must have the combustion air and vent re-piped and terminated to another location. -
Page 9: Annual Startup And General Maintenance
SlimFit — User’s Information Manual ™ fired water boiler Annual startup and general maintenance Figure 5 Service and maintenance schedules OWNER MAINTENANCE (see the following pages for instructions) Contact your boiler service technician to inspect, service and start up your boiler. You must have an annual start-up performed by a BEGINNING OF SEASON qualified service technician to ensure reliable operation of the boiler and system. - Page 10 SlimFit — User’s Information Manual ™ fired water boiler Maintenance and service overview The boiler must be serviced & maintained The boiler must be inspected and started annually, at the beginning of the heating season, by a qualified service technician. In addition, the maintenance and care of the boiler listed on Figure 5, page 9 and explained in this manual must be performed to assure maximum boiler efficiency and reliability.
- Page 11 SlimFit — User’s Information Manual ™ fired water boiler Maintenance procedures — DAILY Check the boiler area DIRECT EXHAUST installations: Verify combustion air openings are clear and flue is unobstructed To prevent potential of severe personal in- jury, death or substantial property dam- age, 1.
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Page 12: Check Vent Piping
SlimFit — User’s Information Manual ™ fired water boiler Maintenance procedures — MONTHLY Perform DAILY procedures plus the 2. If you notice flue gas escaping, this indicates a dry conden- following additional procedures . . . sate drain trap. See step 4 for procedure to fill trap. Call your qualified service technician to inspect the boiler and condensate line and refill the condensate trap if problem persists regularly. - Page 13 SlimFit — User’s Information Manual ™ fired water boiler Maintenance procedures — PERIODICALLY Perform DAILY procedures Figure 6 Low water cutoff plus the following additional procedures . . . Test the low water cutoff 1. Remove the boiler jacket door by rotating the two latches on top of the boiler counterclockwise.
- Page 14 SlimFit — User’s Information Manual ™ fired water boiler Maintenance procedures — EVERY 6 MONTHS Perform DAILY and MONTHLY procedures plus the following additional procedures . . . Check the boiler water and gas piping 1. Perform gas leak inspection per steps 1 through 7 of the Operating Instructions, Fig- ure 1, page 4.
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Page 15: To Shut Down The Boiler
SlimFit — User’s Information Manual ™ fired water boiler Maintenance procedures — END OF SEASON 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. - Page 16 SlimFit — User’s Information Manual ™ fired water boiler Part number 550-100-088/0814...
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