September
2012 Page
19
INSTALLATION: SETTING THE ANALOG AQUASTAT
ANALOG IMMERSION AQUASTAT
(Indoor units -Outdoor factory installed)
1) Loosen screw on right side of case and remove cover.
SET the high limit set point knob to the desired shut off
water temp (never above 195 degrees). NOTE these
units have a built in 10 degree drop diff erential.
2) Insert the sensing probe into the immersion well.
The sensing probe MUST touch the bottom of the well.
Sharp bends in sensing probe wire could impair operation.
3) Fasten aquastat to the well by tightening the adapter
clamp set screw in the top of the unit.
4) Replace cover.
ADDITIONAL SAFETY CONTROLS
HIGH TEMPERATURE LIMIT CONTROL
If installation is to comply with ASME or Canadian requirements, an additional high temperature limit is required.
Install control in supply piping close to the appliance. Set second control to approx. 20 °F above set point of fi rst
control. Maximum set point should be established to protect weakest component in the system (such as plastic
piping). The boiler should be protected at no more than 240 degrees.
LOW WATER CUTOFF
A low water cutoff device (LWCO) is required when the heat source is installed above radiation level or by certain
state or local codes or insurance companies. If required, the LWCO must be installed code and manufacture’s instructions.
ELECTRICAL (CONT.)