Lochinvar SNR200-100 用户手册

1.  The circulator shipped with the Shield water heater is water-

lubricated.  No oiling is required.

2.  Check other circulators in the system. Oil any circulators 

requiring oil, following circulator manufacturer’s 
instructions. Over-oiling will damage the circulator.

       

Installation & Service Manual

TM

Glass lined storage tanks have a magnesium anode(s) (FIG. 11-4) 
to provide cathodical protection of the lining and minimize 
corrosion. Aggressive water conditions in some areas of the 
country may accelerate the deterioration of the anode(s).  The 
anode(s) should be periodically removed and inspected to 
determine if replacement is necessary.

The heater must be valved off from the system and fully drained 
to remove an anode for inspection. Anodes are supplied in 
threaded fittings on the side of the tank. Adequate service 
clearance is required to allow removal of an anode. The anode(s) 
should be replaced when more than six inches of the core wire is 
exposed at either end of the rod.

Anode rods showing excessive decomposition 
may indicate electrolysis. An earth ground 
should be attached to the vessel to divert 
stray current and prevent tank damage.

1.  Ensure Delta T is less than 25°F.

The water heater contains ceramic fiber 
materials.  Use care when handling these 
materials per instructions in this manual. 
Failure to comply could result in severe 
personal injury.

 WARNING

 5. Remove the condensate hose from the heat exchanger 

end. Connect a field supplied 3/4" diameter hose to 
a drain pan. Using field supplied means, cover the 
refractory in the back of the combustion chamber of the 
heat exchanger.

  6. Use a vacuum cleaner to remove any accumulation on 

the water heater heating surfaces.  Do not use any solvent.

 7. Brush the heat exchanger while dry using a nylon 

bristle brush. Caution:  DO  NOT  use  a  metal  brush.                  
Re-vacuum the heat exchanger.

  8.  Finish cleaning using a clean cloth dampened with warm 

water.  Rinse out debris with a low pressure water supply.

  9.  Allow the heat exchanger to thoroughly dry.

10.  Remove the field supplied rear refractory cover from the 

back of the combustion chamber of the heat exchanger 
and reassemble. 

11.  Close isolation valves on piping to isolate water heater 

from system.  Attach a hose to the water heater drain and 
flush water heater thoroughly with clean water by using 
purging valves to allow water to flow through the water 
make-up line to the water heater.

12.  Perform start-up and check-out procedures in the Check 

Flame and Combustion - Section 9 - Startup on page 48 
of this manual.

13. Replace the access cover and restore water heater to 

operation.

SNR150-100
SNR200-100
SNA285-125
SNA400-125

KIT30063

CTN20005

Rear Refractory Cover

MSC20083*

Nylon 4" Wheel Brush*

MSC20084

3mm Allen Wrench

MSC20086

1/4" x 24" Drill Extension

SNA500-125

KIT30064

CTN20005

Rear Refractory Cover

MSC20083*

Nylon 4" Wheel Brush*

MSC20085

1/4" x 12" Drill Extension

MSC20086

1/4" x 24" Drill Extension

3.  Remove the nuts securing the heat exchanger access cover 

to the heat exchanger and set aside.

4.  Remove the heat exchanger access cover, burner, and 
 

gas/air arm assembly.

* Do NOT use a metal brush. Only use 
the kit provided brush or an equivalent 
replacement nylon brush. 

 CAUTION

Rope gasket is intended for sealing combustion 
(FIG. 11-3). If damaged DO NOT reuse, the 
heat exchanger door must be replaced. Consult 
factory for replacement heat exchanger door 
(kit WTR3080).

ROPE GASKET

 IF GASKET IS DAMAGED 

DO NOT REUSE, THE HEAT EXCHANGER DOOR 
MUST BE REPLACED.

ANODE RODS