Please read before proceeding – Lochinvar SYNC 1.3 User Manual
Page 3

Installation & Operation Manual
Please read before proceeding
Installer – Read all instructions, including 
this manual and the SYNC Service 
Manual, before installing. Perform steps 
in the order given.
User – This manual is for use only 
by a qualified heating installer/
service technician. Refer to the User’s 
Information Manual for your reference.
Have this boiler serviced/inspected by 
a qualified service technician, at least 
annually.
Failure to comply with the above could 
result in severe personal injury, death or 
substantial property damage.
Failure to adhere to the guidelines on this 
page can result in severe personal injury, 
death, or substantial property damage.
When servicing boiler –
• To avoid electric shock, disconnect electrical supply 
 before performing maintenance.
• To avoid severe burns, allow boiler to cool before 
 performing 
maintenance.
Boiler operation –
• Do not block flow of combustion or ventilation air to 
 the boiler.
• Should overheating occur or gas supply fail to shut off, 
 do not turn off or disconnect electrical supply to 
 circulator. Instead, shut off the gas supply at a location 
 external to the appliance.
• Do not use this boiler if any part has been under water. 
 The possible damage to a flooded appliance can be 
 extensive and present numerous safety hazards. Any 
 appliance that has been under water must be replaced.
Boiler water –
•
Thoroughly flush the system (without boiler
 connected) to remove sediment. The high-efficiency 
 heat exchanger can be damaged by build-up or 
 corrosion due to sediment.
• Do not use petroleum-based cleaning or sealing 
 compounds in the boiler system. Gaskets and seals in 
 the system may be damaged. This can result in 
 substantial property damage.
• Do not use “homemade cures” or “boiler patent 
 medicines”. Serious damage to the boiler, personnel, 
 and/or property may result.
• Continual fresh make-up water will reduce boiler life. 
 Mineral buildup in the heat exchanger reduces heat 
 transfer, overheats the stainless steel heat exchanger, 
 and causes failure. Addition of oxygen carried in by 
 makeup water can cause internal corrosion in system 
 components. Leaks in boiler or piping must be repaired 
 at once to prevent the need for makeup water.
Freeze protection fluids –
• NEVER use automotive antifreeze. Use only inhibited 
 propylene glycol solutions, which are specifically 
 formulated for hydronic systems. Ethylene glycol is 
 toxic and can attack gaskets and seals used in hydronic 
 systems.
When calling or writing about the boiler 
– Please have the boiler model and serial 
number from the boiler rating plate.
Consider piping and installation when 
determining boiler location.
Any claims for damage or shortage in 
shipment must be filed immediately 
against the transportation company by 
the consignee.
Factory warranty (shipped with unit) does 
not apply to units improperly installed or 
improperly operated.
3
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.
This appliance MUST NOT be installed in 
any location where gasoline or flammable 
vapors are likely to be present.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do 
 not use any phone in your building.
• Immediately call your gas supplier 
 from a near by phone. Follow the 
 gas supplier’s instructions.
• If you cannot reach your gas supplier, 
 call the fire department.
• 
Installation and service must be
 performed by a qualified installer, 
 service agency, or the gas supplier.
ƽ WARNING
NOTICE
ƽ WARNING
ƽ WARNING
