Low Draft Voltage Adjustment | 19 |
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After the installation is completed but before the first fire is lit, check and record the high and low draft readings.
Combustion Motor Speed Control
Low draft only set point.
The small straight screwdriver slot is plastic; therefore, the unit can be adjusted while in operation.
Fig.44
These units are
The control board on the Accentra Insert is equipped with a low draft adjustment port. Located on the control face just to the right of the igniter light. See Figure 44. This voltage adjustment is provided to allow the unit to be adjusted for the household voltage where the unit is going to be in permanant operation. NOTE: The line voltage varies from area to area and often home to home.
The low draft voltage should be adjusted to achieve the most efficient burn on low burn or "maintenance". This voltage adjustment allows the installer to change the low voltage set point approximately 15 volts. This adjustment should be done by the installer during set up because a draft meter reading is required to insure proper set up.
If the unit is not adjusted properly, it does not cause a safety concern. If the unit is adjusted too high, only effiency is lost. If the unit is adjusted too low, the low draft pressure switch will not allow the feeder motor or the igniter to operate.
Fig. 45
Draft Meter bolt hole location
The head of the plug bolt can be accessed through the bottom distribution air inlet with the cast ash lip removed.
A simple draft test should be performed after completing the flue pipe installation. To record the results for future reference:
1.Plug unit into a 120VAC, 60 HZ outlet.
2.Close the hopper lid and front view door. Neither pellets or a fire are required for this test.
3.With the mode selector in the "OFF" position, turn the feed adjuster to "TEST".
4.Record the high draft_____in. W.C. (Normal is -
.45 to
5.After 2 minutes is up, the combustion motor will go down to low draft and the distribution blower will go on high. Allow approximately 15 seconds to pass for the combustion motor to slow before checking the low draft.
6.If the low draft is between .30 and .35, record the reading _____ in. W.C. If the reading is higher, slowly turn the set screw
NOTE:The test mode alternates from high to low draft every 60 seconds. If more time is needed for draft adjustment, wait until the next low draft cycle.
NOTE: In some cases, the draft may not go as low as .30 even with the set screw completely