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4. Fit the case onto the well so that the clamp on the case slides over the well. Securely
tighten the clamp screw. Note: Align the controller prior to tightening securely.
5. Set the control settings to the desired temperatures. Set HI to the temperature that you
want the water to reach during a call for heat. Set Lo to the temperature that you want
the water to maintain in the vessel when there is not a call for heat. Set DIFF to an
amount that you want the Lo setting temperature to cycle between. Note: The Hi limit
must be set at least 20°F above the Lo limit setting.
Do not set the low limit
below 140°F.
6. If a room thermostat (or other device) is to be used to call for heat, the factory-installed
jumper wire will need to be removed from the triple aquastat and replaced with wiring
(24VDC) from the thermostat (refer to figure above) If the jumper is not removed, the
control will always sense a call for heat. If this is the case, the burner will always cycle
between the high temperature limit and its fixed differential of 10°F, and the water
circulation pump will be powered (if this control is used for the circulation pump).
7. If using the circulation pump control on the aquastat, wire the pump control across
terminals C1 and C2 using a 115V coil relay to provide separate power to the pump.
The amperage rating of the controller is limited to a total load of 8 amps, which is mostly
consumed by the burner itself. The relay is necessary to make sure that the controller is
not overloaded by the addition of the pump. Make sure to connect according to NEC
code, with approved metal conduit. Note: Many installations use separate controls for
the pump.
Regardless of the pump control method used, be aware of the
requirement for a minimum of 140°F return water temperature. If this requirement is not
met, the vessel warranty is void.
8. Install the cover to the control.
4.2.3 High-Limit Temperature Controller Installation.
1. Remove the cover from the high-limit temperature aquastat control.
2. Fill the high-limit temperature aquastat thermal well (locate well according to figures)
with thermal conductive grease following the same procedure as in section 4.2.2.
Remove jumper wire
and install room
thermostat here, if used.
HI
Lo
DIFF
