Lochinvar SNA285-125 Manuale Utente

Follow the service and maintenance procedures given throughout this manual and in component literature 
shipped with the water heater.  Failure to perform the service and maintenance could result in damage to the 
water heater or system.  Failure to follow the directions in this manual and component literature could result 
in severe personal injury, death, or substantial property damage.

The water heater should be inspected annually only by a qualified service technician.  In addition, the 
maintenance and care of the water heater designated in Table 11A and explained on the following pages must 
be performed to assure maximum water heater efficiency and reliability.  Failure to service and maintain the 
water heater and system could result in equipment failure.

Electrical shock hazard – Turn off power to the water heater before any service operation on the water heater 
except as noted otherwise in this instruction manual.  Failure to turn off electrical power could result in 
electrical shock, causing severe personal injury or death.

1.  Inspect any problems reported by the owner and correct 

before proceeding.

1.  Verify that water heater area is free of any combustible 

materials, gasoline and other flammable vapors and 
liquids.

2.  Verify that air intake area is free of any of the contaminants 

listed in Section 1 of this manual.  If any of these are 
present in the water heater intake air vicinity, they must 
be removed.  If they cannot be removed, reinstall the air 
and vent lines per this manual. 

1.  Remove the front access cover and inspect the interior of 

the water heater.

Eliminate all system or water heater leaks.  
Leaking water may cause severe property 
damage.

1.  Inspect all water and gas piping and verify to be leak free.

2.  Look for signs of leaking lines and correct any problems 

found.

3.  Check gas line using the procedure found in Section 7 -  Gas 

Connections.

The condensate trap must be filled with water 
during all times of water heater operation to 
avoid flue gas emission from the condensate 
drain line.  Failure to fill the trap could result 
in severe personal injury or death.

 WARNING

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1.  Remove the clean out cap on the bottom of the trap.  Let 

the condensate and any debris drain out.

2.  Replace the clean out cap.

3.  Fill with fresh water until the water begins to pour out of 

the drain.

4. Resume 

operation.

2" PVC CAP WITH

BLOCKED DRAIN SWITCH

CONDENSATE DRAIN

RETAINING SCREW

CONDENSATE FROM

HEAT EXCHANGER

REMOVABLE CAP

TO CLEAN OUT TRAP

       

Installation & Service Manual

TM

1.  Visually inspect the entire flue gas venting system and air 

piping for blockage, deterioration or leakage.  Repair any 
joints that show signs of leakage. Verify that air inlet pipe is 
connected and properly sealed.

2.  Verify that water heater vent discharge and air intake are 

clean and free of obstructions.

Failure to inspect for the above conditions 
and have them repaired can result in severe 
personal injury or death.

 WARNING

1.  Verify all system components are correctly installed and 

operational.

2.  Check the cold fill pressure for the system.  Verify it is 

correct (must be a minimum of 12 PSI).

3.  Watch the system pressure as the water heater heats up 

(during testing) to ensure pressure does not rise too high.  
Excessive pressure rise indicates expansion tank sizing or 
performance problem.

4.  Inspect automatic air vents and air separators.  Remove air 

vent caps and briefly push valve to flush vent.  Replace caps.  
Make sure vents do not leak.  Replace any leaking vents.