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FIGURE 6: Burner, Side View (Internal Assembly)
Step 5.6 Setting the Vacuum
1. Turn on gas and electrical power to system and
unit.
2. Set thermostats above room temperature. See
that all burners are operating properly.
3. Allow at least one-half hour operation for
temperature to normalize, then check system
vacuum balance. Vacuum can be measured by
connecting a manometer to the end vent as
shown on Page 11, figure 10.
4. Normal end vent vacuum should be set at
approximately 2.5" w.c. (hot).
5. Vacuum adjustments are made by means of the
damper in the pump inlet and the adjustable
damper coupling(s) in the system. Check the
vacuum at all end vents and then adjust the
damper coupling to obtain equal vacuum
readings of 3.5" w.c. or slightly above, then
adjust the pump inlet damper until vacuum
readings are a minimum 2.5"-3.0" w.c.
6. With systems designed to operate at maximum
vacuum, it may not be possible to obtain
vacuum differential readings at slightly above
3.5" w.c. If so, adjust damper coupling to
maximum but equal vacuum readings. Be sure
to lock all dampers securely after adjustment.
SECTION 5: F
7. Reset thermostats to desired room temperature.
8. If heat is not required, turn off main switch and
close main gas valve.
C
I
UEL
ONVERSION
NSTRUCTIONS
9 of 21
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