Trane Gas Unit Heaters Manuel d'installation télécharger pdf (Page 30)

Start-Up

30 GHND-SVX01C-EN

Gas Input Rate

Check the gas input rate as follows:

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

same gas meter as the unit heater.

2. Turn gas on to the unit heater.

3. Using the gas meter, clock the time

that it takes to burn

one cubic foot of gas (Heating Value).

4. Insert the time, in seconds

, into the formula below:

Example: If the heating value = 1000 BTU/ft

and the time/

= 18 s/ft

then

Input Rate = 200,000 BTU/hr

(Refer to “General Safety Information,” p. 7 for metric

conversions.)

Note: If the computation exceeds, or is less than 95

percent of the gas Btu/h input rating (see “Unit

Dimensions and Weights,” p. 10), adjust the gas

pressure:.

Gas Pressure Adjustments

Adjust the gas pressure as follows:

1. NATURAL GAS: Optimum results are obtained when

the heater is operating at its full input rating 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:

a. Attach manometer at pressure tap plug adjacent to

control outlet.

b. Remove the regulator adjustment screw cap,

located on the combination gas valve.

c. With a small screwdriver, rotate the adjustment

screw counterclockwise to decrease or clockwise to

increase pressure. Do not force beyond stop limits.

d. Replace regulator adjustment screw cap.

2. PROPANE GAS: An exact mani

fold pressure of

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

eration of the heater. If the unit is equipped with a

pressure regulator on the combination gas valve,

follow Step a through Step d (above). If the unit is not

so equipped, the propane gas supply system pressure

must be regulated to attain this manifold operating

pressure.

3. The adjusted manifold pressure should not vary more

than 1

0 percent from the pressure specified in Tab l e 6,

p. 30.

Primary Air Shutter Adjustment

After the unit has been operating for at least 15 minutes,

adjust the primary air flow to the burners. Turn the friction-

locked, manually-rotated air shutters clockwise to close, or

counterclockwise to open (see Figure 21, p. 29, Figure 3,

p. 8, and Figure 5, p. 9).

For correct air adjustment, close the air shutter until yellow

tips in the flame appear. Then open the air shutter to the

point just beyond the position where yellow tipping

disappears. Refer to Figure 22.

Note: There may be momentary and spasmodic orange

flashes in the flame. This is caused by the burning

of airborne dust particles, and should not be

confused with the yellow tipping, which is a stable

NOTICE:

Overfiring!

Never overfire the unit heater, as this could cause

unsatisfactory operation, or shorten the life of the

heater.

Input Rate =

Heating Value (Btu/ft

) (3600 s/hr)

Time (s/ft

)

Input Rate =

(1000 BTU/ft

) (3600 s/hr)

18 s/ft

Table 6. Main burner orifice schedule

(a)

(a) This schedule is for units operating at normal altitudes of 2000 feet

(610 m) or less. SPECIAL ORIFICES ARE REQUIRED FOR INSTALLA-

TIONS ABOVE 2,000 FEET (610 m).

Input in

1000

BTU(a)

Type of Gas Natural Propane

No. of

Burner

Orifices

Heating

Value

1075 BTU/ft

(40.1 MJ/m

)

2500 BTU/ft

(93.1 MJ/m

)

Manifold

Pressure 3.5” wc (0.9 kPA)

10” wc (2.5 kPA)

100 ft

/hr 96 40 4

Orifice Drill 42 54

125 ft

/hr 120 50 5

Orifice Drill 42 54

150 ft

/hr 140 60 6

Orifice Drill 42 54

175 ft

/hr 163 70 7

Orifice Drill 42 54

200 ft

/hr 186 80 8

Orifice Drill 42 54

225 ft

/hr 210 90 9

Orifice Drill 42 54

250 ft

/hr 233 100 10

Orifice Drill 42 54

300 ft

/hr 280 120 12

Orifice Drill 42 54

350 ft

/hr 326 140 14

Orifice Drill 42 54

400 ft

/hr 372 160 16

Orifice Drill 42 54

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

excess of 2000 feet (610 m) are to be ignored. At altitudes of 2000

to 4500 feet (610 to 1372 m), the unit heaters must be orificed to

90 percent of the normal altitude rating, and be so marked in

accordance with the ETL certification.

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 42 43

Commentaires sur ces manuels

Pas de commentaire

Trane Gas Unit Heaters Manuel d'installation Page 30

Commentaires sur ces manuels

Produits connexes et manuels pour Chauffages d'appoint Trane Gas Unit Heaters