Aerovent IM-200 Manuel d'utilisateur télécharger pdf (Page 4)

Units ordered with the high-low fire option are supplied with

a 1" NPT SR600 two-stage valve mounted in the pipe train.

The SR600 provides an economical means of flame staging

where infinite modulation is not required. Turn-down on low-

fire is from 25% to 75% of high-fire. This valve is powered by

a 24 volt AC transformer. When the coil is energized, the valve

is at low-fire. When the coil is de-energized, it is at high-fire.

Adjustments

To check the minimum or low-fire and maximum or high-fire

pressures for the limits of modulation or staging, use the fol-

lowing procedures:

To set minimum or low-fire

1. Remove the cover plate 1.

2. Remove the high fire adjusting screw 2, spring 3, and

plunger 4. A small magnet is useful for this purpose.

Handle the plunger carefully to avoid marring or collecting

dirt. Do not lubricate.

3. Modulation or Staging: Using the low-fire adjusting screw

5, set the manifold pressure to the manufacturer’s specifi-

cations (50% to 75% of high-fire).

4. Modulation or Staging: Cycle the solenoid gas valve to

check for proper ignition.

5. Modulation or Staging: Adjust the air shutter or increase

low-fire adjustment if needed.

6. Replace the plunger, spring and high-fire adjusting screw.

To set maximum or high-fire:

Note: To avoid danger of over-firing, make certain that the

inlet pressure is at 1.0" w.c. above the outlet pressure.

1. Modulation and Staging: Using the high-fire adjusting

screw 2, set the manifold pressure to the manufacturer’s

specifications. See page 1, Fig. 1.

2. Staging Only: Cycle the burner to check performance.

3. Replace the cover plate.

High-Low Fire Option

Make sure plunger

is installed as

above.

AEROVENT | WWW.AEROVENT.COM

5959 Trenton Lane N | Minneapolis, MN 55442 | Phone: 763-551-7500 | Fax: 763-551-7501

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Aerovent IM-200 Manuel d'utilisateur Page 4