Lochinvar SNR200-100 用户手册

Failure to apply pipe sealing compound as 
detailed in this manual can result in severe 
personal injury, death, or substantial 
property damage.

Shield water heaters are typically shipped 
ready to fire on natural gas. Check the 
water heater rating plate to determine 
which fuel the water heater is set for. In 
order to operate on LP gas contact the 
factory, an orifice MUST BE installed or 
a gas valve adjustment MUST BE made.  
Failure to comply could result in severe 
personal injury, death, or substantial 
property damage.

Use two wrenches when tightening gas 
piping at water heater (FIG. 6-3), using 
one wrench to prevent the water heater 
gas line connection from turning.  Failure 
to support the water heater gas connection 
pipe to prevent it from turning could 
damage gas line components.

USE BACK UP WRENCH
TO PREVENT PIPE FROM
ROTATING

1.  Refer to Table 6A for pipe length and diameter.  Based on 

rated water heater input (divide by 1,000 to obtain cubic 
feet per hour).

 

a.  Table 6A is only for natural gas with specific gravity 
  

0.60 inches, with a pressure drop through the gas 

  

piping of 0.50 inches w.c.

 

b.  For additional gas pipe sizing information, refer to 
  

ANSI Z223.1 (or B149.1 for Canadian installations).

1.  Pressure required at the gas valve inlet pressure port:
 

• Maximum 14 inches w.c. with no flow (lockup) or 
   with water heater on.

 

•  Minimum 4 inches w.c. with gas flowing (verify during 
   water heater startup).

2.  Install 100% lockup gas pressure regulator in supply line if 

inlet pressure can exceed 14 inches w.c. at any time.  Adjust 
lockup regulator for 14 inches w.c. maximum.

1.  Contact gas supplier to size pipes, tanks, and 100% lockup 

gas pressure regulator.

1.  Adjust propane supply regulator provided by the gas 

supplier for 14 inches w.c. maximum pressure.

2.  Pressure required at gas valve inlet pressure port:
 

 • Maximum 14 inches w.c. with no flow (lockup) or with 
   water heater on.

 

• Minimum 8 inches w.c. with gas flowing (verify during 
   water heater startup).

Maximum inlet gas pressure must not 
exceed the value specified. Minimum 
value listed is for the purposes of input 
adjustment.

 WARNING

 WARNING

 WARNING

 WARNING Shield water heaters are typically shipped 

ready to fire on natural gas. Check water 
heater rating plate to determine which fuel 
the water heater is set for.  In order to operate 
on LP gas contact the factory, an orifice 
MUST BE installed or a gas valve adjustment 
MUST BE made. Failure to comply could 
result in severe personal injury, death, or 
substantial property damage.

 WARNING Ensure that the high gas pressure 

regulator is at least 10 feet upstream of 
the appliance.

       

Installation & Service Manual

TM