Trane Gas Unit Heaters Instalační manuál stáhnout pdf (Strana 28)

Operation

28 GUNE-SVX001A-EN

Gas Input Rate

Check the gas input rate as follows (refer to “General

Safety Information,” p. 3 for metric conversions).

1. Turn off all gas appliances that use gas through the

same meter as the duct furnace.

2. Turn the gas on to the duct furnace.

3. Clock the time in seconds required to burn one cubic

foot of gas by checking the gas meter.

4. Insert the time required to burn one cubic foot of gas

into the following formula and compute the input rate.

For example:

Assume the Btu content of one cubic foot of gas is 1000,

and that it takes 18 seconds to burn one cubic foot of gas.

Note: If the computation exceeds, or is less than

95 percent of the gas Btu/h input rating (see

Table 2, p. 9), adjust the gas pressure.

Adjusting Gas Pressure

Natural Gas. Best results are obtained when the duct

furnace is operating at its full rated input with the manifold

pressure of 3.5 inches wc (0.9 kPa). Adjustment of the

pressure regulator is not normally necessary since it is

preset at the factory. However, field adjustment may be

made as follows:

1. Attach manometer at the pressure tap plug adjacent to

the control outlet.

2. Remove the regulator adjustment screw cap, located

on the combination gas valve.

3. With a small screwdriver, rotate the adjustment screw

counterclockwise to decrease pressure, or clockwise to

increase pressure.

4. Replace regulator adjustment screw cap.

Propane (LP) Gas. An exact manifold pressure of

10.0 inches wc (2.5 kPa) must be maintained for proper

operation of the duct furnace. If the duct furnace is

equipped with a pressure regulator on the combination

gas valve, follow Step 1 through Step 4 (above). If the duct

furnace is not so equipped, the propane gas supply system

pressure must be regulated to attain this manifold

operating pressure.

Figure 23. Direct spark ignition system,

tubular duct

furnace

NOTICE:

Heater Damage!

Never over-fire the duct furnace, as this may cause

unsatisfactory operation, or shorten the life of the

heater.

3600 (seconds per hour) X Btu/ft

=Input Rate

Time (seconds)

3600 x 1000

= 200,000

ORIFICE

BURNER BRACKET

D9375

GAS VALVE

SPARK IGNITOR

FLAME SENSOR

BURNER

MANIFOLD

Table 9. Main burner orifice schedule standard

altitude

(a)

(a)This schedule is for units at operating at normal altitudes of 2,000 feet

(610 m) or less.

Input

1000

Btu

Type of

Gas Natural Propane

# of

Burner

Orifices

Heating

Value

1,050 Btu/ft

(39.1 MJ/m

)

2,500 Btu/ft

(93.1 MJ/m

)

Manifold

Pressure

3.5 inches wc

(0.87 kPA)

10 inches wc

(2.49 kPA)

100

orifice drill

3.40 mm

150

orifice drill

140

3.40 mm

200

orifice drill

186

3.40 mm

250

orifice drill

233

3.40 mm

100

300

orifice drill

280

3.40 mm

120

350

orifice drill

326

3.40 mm

140

400

orifice drill

372

3.40 mm

140

Note: When installed in Canada, any references to deration at altitudes in

excess of 2,000 feet (610 m) are to be ignored. At altitudes of 2,000

to 4,500 feet (610 to 1372 m), the unit must be field derated and be

so marked in accordance with ETL certification. See Table 10 and

Table 11, p. 29 for field deration information.

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