Lochinvar 2.5 사용자 설명서

The gas piping must be sized for the proper flow and length of 
pipe, to avoid excessive pressure drop.  Both the gas meter and 
the gas regulator must be properly sized for the total gas load.  

If you experience a pressure drop greater than 1 inch w.c. 

 

 

 

 

 

 

(249 Pa), the meter, regulator, or gas line is undersized or in 
need of service.  Perform the steps below when checking inlet 
gas supply:

1.  Turn the main power switch to the “OFF” position.

2.  Shut off gas supply at the manual gas valve in the gas 
 

piping to the appliance.  

3.  Remove the 1/8" pipe plug on the flange to the factory 
 

supplied gas shutoff valve and install a suitable 1/8" 

 

fitting (field supplied) for the manometer tubing.  Place the 

 

tubing of the manometer over the tap once the 1/8" 

 

fitting is installed as shown in FIG. 6-4.

4.  Slowly turn on the gas supply at the factory installed 
 

manual gas valve.

5.  Turn the power switch to the “ON” position.

6.  Adjust the temperature set point on the control panel of 
 

the SMART TOUCH control module to call for heat or 

 

utilize Service Mode, see page 44 of this manual.

7.  Observe the gas supply pressure as the burner fires at 
 

100% of rated input.  Percent of burner input will be 

 

displayed on the Modulation Screen.

8.  Ensure inlet pressure is within specified range. 

 

 

Minimum and maximum gas supply pressures are 

 

specified in this section of the manual.

9.  If gas supply pressure is within normal range and no 
 

adjustments are needed, proceed on to Step 11.  

10.  If the gas pressure is out of range, contact the gas utility, 
 

gas supplier, qualified installer or service agency to 

 

determine the necessary steps to provide proper gas 

 

pressure to the control.

11.  Turn the power switch to the “OFF” position.

12.  Shut off the gas supply at the manual gas valve in the gas 
 

piping to the appliance.  

13.  Remove the manometer from the pressure tap on top of 
 

the gas valve.  Remove the 1/8" (3 mm) field supplied 

 

fitting and reinstall the pipe plug removed in Step 3.

DO NOT adjust or attempt to measure gas 
valve outlet pressure.   Attempting to alter 
or measure the gas valve outlet pressure 
could result in damage to the valve, causing 
potential severe personal injury, death, or 
substantial property damage.

 WARNING

Nominal

Iron Pipe

Size

Inches

Length of Pipe in Straight Feet

Maximum 

Capacity of Pipe 

in Thousands 

of Btu/hr for 

gas  pressures  of      

14 Inches Water 

Column (0.5 

PSIG) or less and 

a pressure drop 

of 0.5 Inch Water 

Column (Based 

on NAT GAS, 

1025 Btu/hr per 

Cubic Foot of 

Gas and 0.60 

Specific Gravity)

10

20

30

40

50

60

70

80

90

100

125

150

175

200

1½

2,150

1,500

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

2

4,100

2,820

2,260

1,950

1,720

1,560

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

2½

6,460

4,460

3,610

3,100

2,720

2,460 2,310 2,100

2,000

1,900

1,700 1,540

N/A

N/A

3

11,200

7,900

6,400

5,400

4,870

4,410 4,000 3,800

3,540

3,300

3,000 2,720 2,500

2,340

4

23,500 16,100 13,100 11,100 10,000 9,000 8,300 7,690

7,380

6,870

6,150 5,640 5,130

4,720

        

Installation & Operation Manual