LAARS Heating Systems Company
Page 6
2C. Adjustments
Set the differential to correspond with the boiler
manufacturer recommendations. To adjust models
with adjustable differential, rotate the wheel on the
back of the snap switch until the desired reading is
aligned with the V notch in the frame. The wheel
provides an adjustment from 5 to 30 degrees (F).
Replace the cover on the aquastat controller.
Adjust the control point to correspond with the
boiler manufacturer's recommendations. To adjust,
insert a screwdriver in the slotted screw-type head
located beneath the window in the cover. Turn the
scale to the desired control point.
2D. Checkout
Check to make certain the aquastat controller is
installed and adjusted properly. Operate the system
and observe the action of the device through several
cycles to make certain that it provides proper low limit
cut-out protection and circulator control. Make any
further adjustments needed.
Figure 7. Typical Connection Diagram for an Oil-Fired
Hydronic Heating System That Provides Year Around
Domestic Hot Water.
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