Mendota FV-41 Specifications download pdf (Page 19)

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GAS PRESSURE REQUIREMENTS

One of the main causes of operating problems with gas appliances can be improper gas pressure!

Problems such as changes in flame color or configuration, gas pilot or burner outages, intermittent operation, changes in

heat output, excessive burner noise, etc. are nearly always the result of changes in gas pressure or improper gas pres-

sure at the time of the installation. The most important item to check during initial installation and the first thing to check

when problems occur are the input and output gas pressures!

Gas is normally supplied to a residence at 1/2 PSI (13" - 15" W.C.) (3 KPA). A pressure regulator is then placed outside

the residence, near the gas meter, which drops this pressure to 7" W.C. (1.8 KPA) (Nat. Gas). This "inches to inches"

regulator is of adequate capacity to service the gas appliances (such as dryer, furnace, etc.). If this regulator's capacity is

not sufficient to add the Gas Fireplace, an additional "inches to inches" regulator must be installed for the Fireplace.

EXCEPTION: Some codes allow 2-PSI (1.4KPA) supplies to enter the residence, in which case "pounds to inches" regula-

tors are used.

The following table provides information on correct gas pressure requirements. Be sure your gas supplier or plumber

carefully follows this table.

GAS PRESSURE REQUIREMENTS

NOTE: For altitudes above 2.000 feet some variations in air shutter settings may be required.

Manifold pressure must EHWDNHQ DWWKH³OUTPUT PRESSURE" tap and inlet pressure at the "INLET PRESSURE" tap

with the burner operating by a qualified installer. Perform pressure tests prior to installing facia material around this fire-

place.

DESIRED

INLET

PRESSURE

MINIMUM

INLET

PRESSURE

MAXIMUM

INLET

PRESSURE

MANIFOLD

OUTLET

PRESSURE

AIR SHUTTER

POSITION*

NATURAL GAS 7.0" W.C.

(1.75 kPa)

5.0" W.C.

(1.12 kPa)

11" W.C.

(2.61 kPa)

3.5" W.C.

(0.87 kPa)

0 - 1/8 " OPEN

(3 mm)

L.P. GAS 11.0" W.C.

(2.75 kPa)

11" W.C.

(2.75 kPa)

13.0" W.C.

(3.24 kPa)

10.0" W.C.

(2.5 kPa)

1/4" OPEN MIN.

(5 mm)

Figure 9:

Gas Valve Pressure

Test Ports

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 51 52

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Mendota FV-41 Specifications Page 19

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