Lochinvar 80 - 285 User Manual download pdf (Page 45)

Installation & Operation Manual

7 Gas connections (continued)

 WARNING

When re-tightening the set screw, be sure

to tighten securely to prevent gas leaks.

Do not check for gas leaks with an open

flame -- use the bubble test. Failure to use

the bubble test or check for gas leaks can

cause severe personal injury, death, or

substantial property damage.

14. Turn on the gas supply at the manual gas valve.

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

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

the SMART SYSTEM control module to the desired

water temperature so the appliance will call for heat.

17. Check burner performance by cycling the system while

you observe burner response. The burner should ignite

promptly. Flame pattern should be stable. Turn system

off and allow burner to cool, then cycle burner again to

ensure proper ignition and flame characteristics.

Gas Pressure

The gas pressure must remain between 4 inches w.c.

(natural), 8 inches w.c. (LP) minimum and 14 inches w.c.

(natural and LP) maximum during stand-by (static) mode

and while in operating (dynamic) mode. If an in-line

regulator is used, it must be a minimum of 10 feet from the

Knight boiler. It is very important that the gas line is properly

purged by the gas supplier or utility company. Failure to

properly purge the lines or improper line sizing, will result in

ignition failure.

The problem is especially noticeable in NEW LP installations

and also in empty tank situations. This can also occur when

a utility company shuts off service to an area to provide

maintenance to their lines.

Gas valve replacement

The gas valve MUST NOT be replaced with a conventional

gas valve under any circumstances. As an additional safety

feature, this gas valve has a flanged connection to the venturi

and blower.

DETAIL

LOOSEN THE SET SCREW ONE (1) FULL TURN

AND PLACE THE MANOMETER TUBING OVER

THE PRESSURE TAP.

Figure 7-4 Inlet Gas Supply Check

DO NOT adjust or attempt to measure gas

valve outlet pressure. The gas valve is

factory-set for the correct outlet pressure.

This setting is suitable for natural gas and

propane, requiring no field adjustment.

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.

Failure to follow all precautions could

result in fire, explosion, or death!

 WARNING

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Lochinvar 80 - 285 User Manual Page 45

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